Photovoltaic module

Abstract

The utility model provides a photovoltaic assembly comprising a first edge extending along a first direction and a second edge extending along a second direction, and the first direction and the second direction intersect. The battery piece layer comprises a plurality of battery pieces which are arranged along the first side and the second side in a row-column array; wherein the ratio of the sum of the side lengths of the plurality of battery pieces arranged along the first side to the length of the first side is a first ratio, the first ratio is greater than or equal to 95%, the ratio of the sum of the side lengths of the plurality of battery pieces arranged along the second side to the length of the second side is a second ratio, and the second ratio is greater than or equal to 95%; and the absolute value of the difference between the first ratio and the second ratio is less than or equal to 0.8%.

Description

Technical Field

[0001] At least one embodiment of the utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic modules are the core components in solar power generation systems, which are suitable for converting solar energy into electrical energy and storing it through other power storage components, or directly driving the load.

[0003] In a solar power generation system, multiple photovoltaic modules are often required to be arranged in an array in a light field. For this purpose, a large number of photovoltaic modules need to be transported between the production site and the installation site.

[0004] Containers are widely used in land and sea transportation. As a standardized container for loading goods, they are very suitable for transporting photovoltaic modules. Therefore, how to design photovoltaic modules within the limited space of the container to make full use of the internal space of the container so that the efficiency of photovoltaic modules per unit volume of the container is higher has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] In order to solve at least one of the above-mentioned and other technical problems in the prior art, the utility model provides a photovoltaic assembly, which can make full use of the internal space of the container so that the photovoltaic assembly that can be accommodated in the container per unit volume has a higher assembly efficiency.

[0006] An embodiment of the utility model provides a photovoltaic component, comprising: a first side extending along a first direction and a second side extending along a second direction, and the first direction intersects with the second direction; and the photovoltaic component further comprises: a cell layer, comprising a plurality of cells arranged in a row and column array along the first side and the second side; wherein the ratio of the sum of the side lengths of the plurality of cells arranged along the first side to the length of the first side is a first ratio, and the first ratio is greater than or equal to 95%, and the ratio of the sum of the side lengths of the plurality of cells arranged along the second side to the length of the second side is a second ratio, and the second ratio is greater than or equal to 95%; and the absolute value of the difference between the first ratio and the second ratio is less than or equal to 0.8%.

[0007] In an illustrative embodiment, the first ratio is greater than the second ratio, and the first side is greater than the second side.

[0008] In an illustrative embodiment, the length of the first side is configured to be greater than or equal to 2370 mm and less than or equal to 2390 mm; the length of the second side is configured to be greater than or equal to 1120 mm and less than or equal to 1150 mm.

[0009] In an illustrative embodiment, the length of the first side of the above-mentioned battery cell is (190 / n~195 / n) mm, or (207 / n~212 / n) mm; wherein n is a natural number greater than or equal to 2, representing the number of battery cell cuts.

[0010] In an illustrative embodiment, the photovoltaic module further includes a sealing layer laminated on the front and back sides of the battery layer, and the sealing layer and the battery layer form a laminate.

[0011] In an exemplary embodiment, the photovoltaic assembly further includes a frame, and two intersecting edges of the frame define the first edge and the second edge.

[0012] In an illustrative embodiment, the edge of the laminate is inserted into the frame, and the distance between the edge of the laminate and the edge of the frame is configured to be 2 mm to 4 mm.

[0013] In an illustrative embodiment, the battery cell layer further includes a first bus bar, which is disposed on one side of the plurality of battery cells and extends along the second direction; wherein the first bus bar is spaced apart from the edge of the laminate by 10 to 15 mm, and the first bus bar is spaced apart from adjacent battery cells by 2.5 to 5 mm.

[0014] In an illustrative embodiment, the battery cell layer further includes a second bus bar, which is disposed in the middle of the plurality of battery cells and extends along the second direction; wherein the spacing between the second bus bar and adjacent battery cells is constructed to be 2.5 to 3.8 mm.

[0015] In an illustrative embodiment, the battery cell layer is structured to be divided into two battery groups by the second busbar, each of the battery groups includes a plurality of battery strings, and the plurality of battery cells in the same battery string are connected in series.

[0016] In an exemplary embodiment, the battery cells near the first side of the two battery packs and the edge of the laminate are constructed to have different spacings; and / or the absolute value of the difference in spacings between the battery cells near the first side of the two battery packs and the edge of the laminate is constructed to be less than 0.8 mm.

[0017] In an exemplary embodiment, the spacing between two adjacent battery cells in the battery string is configured to be -0.5 mm to 2 mm; and the spacing between two adjacent battery strings is configured to be 0.8 mm to 2 mm.

[0018] In an illustrative embodiment, the sealing layer includes a back plate, and the back plate is provided with at least one lead-out port, and the lead-out port is configured to partially overlap with the second busbar in an orthographic projection along a thickness direction of the battery cell.

[0019] In an illustrative embodiment, an end portion of the battery cell adjacent to the lead-out port and facing the lead-out port is configured as a chamfered structure.

[0020] In an illustrative embodiment, the outlet is an oblong through hole having a major axis and a minor axis, the major axis is configured to be parallel to the second side, and the minor axis is configured to be parallel to the first side.

[0021] In an exemplary embodiment, the length of the short axis is configured to be smaller than the sum of the spacing between the two second bus bars exposed to the lead-out port and the battery cells on both sides and the width of the second bus bar.

[0022] In an illustrative embodiment, the ratio of the length of the major axis to the length of the minor axis is configured to be 1.2 to 1.5.

[0023] In an illustrative embodiment, the spacing between the two lead terminals exposed to the above-mentioned lead-out port is configured to be 5 mm to 7 mm, and the ratio of the spacing between the two lead terminals to the length of the above-mentioned major axis is configured to be 0.375 to 0.5; and / or, the above-mentioned lead terminal is configured to have the same width as the above-mentioned second bus strip, and the ratio of the above-mentioned lead terminal to the length of the above-mentioned minor axis is configured to be 0.4 to 0.6.

[0024] According to the photovoltaic module provided by the utility model, by designing a first ratio of the sum of the lengths of the first sides of the battery cells in the battery cell layer to the first side of the frame, a second ratio of the sum of the lengths of the second sides of the battery cells to the second side of the frame, and the absolute value of the difference between the first ratio and the second ratio, the battery cells can have a higher proportion in the photovoltaic module, thereby making the photovoltaic module have a higher module efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural schematic diagram of a rear-view angle of a photovoltaic assembly according to an exemplary embodiment of the utility model;

[0026] Figure 2 yes Figure 1 A partial enlarged view of part A of the photovoltaic module shown;

[0027] Figure 3 yes Figure 1 The schematic diagram of the structure of the photovoltaic assembly of the exemplary embodiment shown is a front view, wherein the frame is omitted;

[0028] Figure 4 yes Figure 3 A partial enlarged view of part B of the photovoltaic module shown;

[0029] Figure 5 yes Figure 3 A partial enlarged view of part C of the photovoltaic module shown;

[0030] Figure 6 yes Figure 1 A partial enlarged view of portion D of the photovoltaic module shown, wherein the frame is omitted;

[0031] Figure 7 yes Figure 1 A partial enlarged view of part E of the photovoltaic assembly shown, showing the first outlet; and

[0032] Figure 8 yes Figure 7 A partial enlarged view of the first outlet is shown.

[0033] In the drawings, the meanings of the reference numerals are as follows:

[0034] 1. Border;

[0035] 2. Battery layer;

[0036] 21. Battery cells;

[0037] 22. Second confluence zone;

[0038] 221, lead terminal;

[0039] 23. First confluence zone;

[0040] 3. Laminated parts;

[0041] 31. A second outlet; and

[0042] 32. The first exit. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0044] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "include", "comprises", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0045] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0046] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0047] In photovoltaic modules, cells are the main photoelectric conversion elements. In actual transportation and use scenarios, cells are easily damaged (such as physical damage, thermal damage, and chemical corrosion) by various factors in the external environment (such as mechanical impact, wind and rain erosion, and temperature changes). For this reason, a sealing layer is also required in the photovoltaic module to form a laminate with the cell layer to seal the cell, thereby isolating the cell from water vapor and dust and improving a certain mechanical strength; and a frame is also required to support the laminate and the cell, so that the photovoltaic module remains safe and stable during transportation, installation, and use.

[0048] Although laminates and frames improve the safety and stability of photovoltaic modules, they also increase the inactive area of ​​photovoltaic modules. The smaller the area occupied by the cell in the photovoltaic module, the lower the full area efficiency of the photovoltaic module.

[0049] Therefore, how to design a photovoltaic module so that the cells in the photovoltaic module have a higher proportion relative to the photovoltaic module as a whole and can adapt to the limited space in the container has become a technical problem that needs to be solved urgently.

[0050] Figure 1 It is a structural schematic diagram of a rear-view angle of a photovoltaic assembly according to an illustrative embodiment of the utility model.

[0051] According to the photovoltaic module provided by the utility model, Figure 1As shown, it includes a first side extending along a first direction and a second side extending along a second direction, and the first direction intersects with the second direction. And the photovoltaic module also includes: a cell layer 2. The cell layer 2 includes a plurality of cells 21 arranged in a row and column array along the first side and the second side; wherein the ratio of the sum of the side lengths of the plurality of cells 21 arranged along the first side to the length of the first side is a first ratio, the first ratio is greater than or equal to 95%, and the ratio of the sum of the side lengths of the plurality of cells 21 arranged along the second side to the length of the second side is a second ratio, the second ratio is greater than or equal to 95%; and the absolute value of the difference between the first ratio and the second ratio is less than or equal to 0.8%.

[0052] According to the embodiments of the present disclosure, Figure 1 As shown, the photovoltaic module further includes a sealing layer laminated on the front and back sides of the cell layer 2 , and the sealing layer and the cell layer 2 form a laminate 3 .

[0053] In an illustrative embodiment, the sealing layer includes an adhesive film (not shown in the figure), which is laminated on the front, back and periphery of each battery cell 21 of the battery cell layer 2 to wrap the battery cell 21 to form a laminate 3, thereby alleviating the mechanical impact on the battery cell 21 and isolating the battery cell from the external environment. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0054] For example, the adhesive film may also be made of a material having anti-reflection, heat-conducting and supporting functions.

[0055] Furthermore, the laminate 3 also includes a cover plate (not shown in the figure) made of a light-transmitting material, and a back plate (not shown in the figure). The cover plate is arranged on the adhesive film laminated on the front side of the battery cell 21, and the back plate is arranged on the adhesive film laminated on the back side of the battery cell 21, so that the photovoltaic module forms a laminated structure of the cover plate, adhesive film, battery cell 21, adhesive film and back plate from top to bottom.

[0056] According to the embodiments of the present disclosure, Figure 1 As shown, the photovoltaic assembly further includes a frame 1 , and two intersecting sides of the frame 1 define a first side and a second side.

[0057] In an exemplary embodiment, the first direction includes Figure 1 The up and down directions shown, the second direction includes Figure 1 In the left and right directions shown, the first direction and the second direction are orthogonal to each other.

[0058] In an illustrative embodiment, in addition to being laminated on the projection areas of the front and back of the battery cell 21, the laminate 3 is also configured to extend outward along the battery cell 21 at the edge of the battery cell layer 2 to connect to the outer frame 1 and leave a suitable creepage distance. In detail, the frame 1 includes but is not limited to being configured as a substantially rectangular structure and clamped on the edge of the laminate 3. Among them, the frame 1 is not limited to being made of metal material, such as an aluminum frame or a steel frame.

[0059] Figure 2 yes Figure 1 A partial enlarged view of part A of the photovoltaic module shown.

[0060] According to the embodiments of the present utility model, Figure 2 As shown, the edge of the laminate 3 is inserted into the frame 1, and the distance between the edge of the laminate 3 and the edge of the frame 1 is configured to be 2 mm to 4 mm.

[0061] In an exemplary embodiment, the edge of the laminate 3 and the junction of the frame 1 are blocked by the frame 1. Figure 2 In detail, the edge of the laminate 3 and the edge of the first side and the second side of the frame 1 (such as Figure 2 The spacing between the left end and the upper end (i.e., d9 and d10) is configured to be 2 to 4 mm. Specifically, it includes 2 mm, 3 mm, 4 mm, and any value between 2 and 4 mm. In this way, in addition to firmly connecting the battery layer 2 to the frame 1 through the laminate 3, it can also effectively prevent the edge of the laminate 3 from being charged and avoid the occurrence of leakage. Moreover, on this basis, the spacing (i.e., d9 and d10) is not set too wide, which can also avoid the waste of materials for making the laminate 3.

[0062] According to an embodiment of the present invention, the first ratio is configured to be greater than the second ratio, and the first side is greater than the second side.

[0063] In an illustrative embodiment, Figure 1 As shown, the frame 1 includes but is not limited to a structure configured as a substantially rectangular shape, including Figure 1 In the substantially planar space defined by the frame 1, the battery cell layer 2 includes but is not limited to being configured with 144 battery cells 21, the 144 battery cells 21 being arranged in rows (such as Figure 1 Up and down directions as shown) and columns (such as Figure 1 The battery cells 21 are arranged in a 6-row×24-column array in the form of a left-right direction (shown in the figure), wherein the length of the first side of the frame 1 is configured as S1, the length of the second side of the frame 1 is configured as S2, the length of the first side of each battery cell 21 is configured as s1, and the length of the second side is configured as s2.

[0064] Based on the above embodiments, the first ratio B1 is obtained through the above parameters, that is The second ratio B2 is obtained through the above parameters, that is

[0065] Wherein, B1 ≥ 95%, B2 ≥ 95%, and |B1 - B2| ≤ 0.8%. In a preferred embodiment, B1 is configured to be greater than B2. Through the above design, the cell 21 can have a relatively high proportion with respect to the area of the photovoltaic module, reducing the loss of the overall area efficiency of the photovoltaic module. Furthermore, it is ensured that the photovoltaic module has a relatively high module efficiency, and the absolute value of the difference between its module efficiency and the cell efficiency can be less than or equal to 2.5%. For example, the cell efficiency is 25.2% and the module efficiency is 23%.

[0066] According to the embodiments of the present invention, as Figure 1 shown, the length of the first side is configured to be greater than or equal to 2370 millimeters and less than or equal to 2390 millimeters. The length of the second side is configured to be greater than or equal to 1120 millimeters and less than or equal to 1150 millimeters.

[0067] In a schematic embodiment, as Figure 1As shown, the length S1 of the first side of the frame 1 is configured to be greater than or equal to 2375 mm and less than or equal to 2378 mm (i.e., 2370 mm≤S1≤2390 mm), and the length S2 of the second side of the frame 1 is configured to be greater than or equal to 1120 mm and less than or equal to 1150 mm (i.e., 1120 mm≤S2≤1150 mm), wherein the specific size of L1 can be 2370 mm, 2371 mm, 2372 mm, 2373 mm, 2374 mm, 2375 mm, 2376 mm, 2377 mm, 2378 mm, 2379 mm, 2380 mm, 2381 mm, 2382 mm, 2383 mm, 2384 mm, 2385 mm, 2386 mm, 2387 mm, 2388 mm, 2389 mm, 2390 mm, 2391 mm, 2392 mm, 2393 mm, 2394 mm, 2395 mm, 2396 mm, 2397 mm, 2398 mm, 2399 mm, 2391 ...1 mm, 23 0mm, and any value between 2370mm and 2390mm; the specific size of L2 can be 1120mm, 1121mm, 1122mm, 1123mm, 1124mm, 1125mm, 1126mm, 1127mm, 1128mm, 1129mm, 1130mm, 1131mm, 1132mm, 1133mm, 1134mm, 1134mm, 1136mm, 1137mm, 1138mm, 1139mm, 1140mm, 1141mm, 1142mm, 1143mm, 1144mm, 1145mm, 1146mm, 1147mm, 1148mm, 1149mm, 1150mm, 1140mm and any value between 1120mm and 1150mm.

[0068] In a preferred embodiment, the length S1 of the first side of the frame 1 includes but is not limited to being constructed as 2376 mm, and the length S2 of the second side of the frame 1 includes but is not limited to being constructed as 1128 mm, that is, the frame 1 forms a roughly rectangular frame structure of 2376 mm×1128 mm.

[0069] In such an implementation, the size of the frame 1 (ie, the length of the first side and the length of the second side) of the above embodiment can be designed to adapt to the size of the currently used container.

[0070] Taking 40'GP (General Purpose) containers and 40HC (High Cube) containers as examples, the inner dimensions of the above containers are 12032mm (length) × 2352mm (width) × 2393mm (height) (40'GP), 12032mm (length) × 2352mm (width) × 2698mm (height) (40HC). Based on the above dimensions, photovoltaic modules can be arranged in five full pallets along the length direction of the container and two full pallets along the width direction of the container, so that ten full pallets of photovoltaic modules can be arranged in rows and columns in one container.

[0071] According to this arrangement, the margin of the container in the length direction is 152 mm according to the preferred embodiment; the margin of the container in the width direction is 96 mm according to the preferred embodiment. To this end, through the above-mentioned frame size design, the internal space of the container can be more fully utilized to carry a larger area of ​​photovoltaic modules on the basis of the same transportation capacity. In addition, combined with the proportion of the battery cells to the photovoltaic modules in the above-mentioned embodiment, the photovoltaic modules loaded in a container have a higher power generation capacity.

[0072] According to the embodiments of the present utility model, Figure 1 As shown, the length of the first side of the battery cell 21 is configured to be (190 / n-195 / n) mm, or (207 / n-212 / n) mm, wherein n is a natural number greater than or equal to 2, representing the number of battery cells cut.

[0073] In an exemplary embodiment, when n=2 (i.e., a cell 21 formed by two slices), the aspect ratio of the cell (the ratio of the longer side to the shorter side of the cell, i.e., s2 / s1) is configured to be 1.88 to 1.92. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0074] For example, n=3 (ie, the battery cell 21 is formed by three slices).

[0075] In such an embodiment, the length of the second side of the battery cell 21 (i.e., s2) is constructed to be greater than the length of the first side (i.e., s1), so that the battery cell 21 has a longer dimension along the second side of the frame 1, so that under the condition of the same area defined by the frame 21, the total area of ​​the battery cell 21 in the battery cell layer 2 is larger, so as to further make the battery cell have a higher proportion in the photovoltaic module, thereby having a higher power generation capacity.

[0076] Figure 3 yes Figure 1 The schematic diagram of the structure of the photovoltaic assembly of the exemplary embodiment shown is a front view, in which the frame is omitted. Figure 4 yes Figure 3 A partial enlarged view of part B of the photovoltaic module is shown.

[0077] According to the embodiments of the present utility model, Figure 3 and Figure 4As shown, the battery cell layer 2 further includes a first busbar 23, which is arranged in a direction parallel to the second edge, and is arranged between the battery cell layer 2 and the second edge in a direction parallel to the second edge, and is configured to be electrically connected to the adjacent battery cell 21 through a welding strip. The spacing between the first busbar 23 and the edge of the laminate 3 is configured to be 10 to 15 mm, and the spacing between the first busbar 23 and the electrically connected battery cell 21 is configured to be 2.5 to 5 mm.

[0078] In an illustrative embodiment, Figure 3 and Figure 4 As shown, the first busbar 23 is arranged in the longitudinal direction of the battery layer 2 (such as Figure 3 The two ends of the vertical direction (as shown in the figure) are located at the two ends of the length direction of the battery layer 2 (as shown in the figure Figure 3 The upper and lower ends of the battery cells 21 are connected to the first busbar 23 through welding strips. Each battery cell 21 includes but is not limited to being provided with 2m welding strips, where m is a natural number greater than or equal to 7 and less than or equal to 10 (i.e., 7≤m≤10).

[0079] In an illustrative embodiment, Figure 4 As shown, the first busbar 23 and the edge of the laminate 3 (for clarity in the figure, Figure 4 The spacing (i.e., d1) between the two panels (the frame is omitted in the figure) is configured to be 10 to 15 mm (i.e., 10 mm ≤ d1 ≤ 15 mm) so that the photovoltaic module has a set creepage distance. In this way, leakage at the edge of the cell can be prevented to improve the voltage resistance performance of the photovoltaic module.

[0080] In an illustrative embodiment, Figure 4 As shown, the distance (ie, d2) between the first busbar 23 and the electrically connected battery cell 21 is constructed to be 2.5 to 5 mm (ie, 2.5 mm≤d2≤5 mm). In a preferred embodiment, d2 can be constructed to be 3.3 mm (ie, d2=3.3 mm).

[0081] In such an embodiment, the above-mentioned size design is beneficial to the manufacture of photovoltaic modules. If d2 is too small, the first busbar 23 may be easily misaligned during the lamination and / or stacking process, for example, the first busbar 23 may contact the cell 21, thereby causing the cell 21 to crack in response to the stress; if d2 is too large, a larger area of ​​the laminate 3 is required, resulting in a waste of the laminate 3.

[0082] Figure 5 yes Figure 3 A partial enlarged view of portion C of the photovoltaic module shown.

[0083] According to the embodiments of the present utility model, Figure 3and Figure 5 As shown, the battery cell layer (2) further includes a second bus bar (22), which is arranged in the middle of the plurality of battery cells and extends along the second direction; wherein the spacing between the second bus bar 22 and the adjacent battery cells 21 is constructed to be 2.5 to 3.8 mm.

[0084] In an illustrative embodiment, Figure 5 As shown, the spacing between the second busbar 22 and the electrically connected battery cell 21 (i.e., d7 and d8) is configured to be 2.5 to 3.8 mm (i.e., 2.5 mm ≤ d7 ≤ 3.8 mm, i.e., 2.5 mm ≤ d8 ≤ 3.8 mm), and d7 and d8 are equal. In a preferred embodiment, d7 and d8 can be configured to be 3.5 mm (i.e., d7 = d8 = 3.3 mm).

[0085] In such an embodiment, the above-mentioned size design is beneficial to the manufacture of photovoltaic modules. If d7 and / or d8 are too small, the second busbar 22 may be easily misaligned during the lamination and / or stacking process, for example, the second busbar 22 may contact the cell 21, thereby causing the cell 21 to crack in response to the stress; if d7 or d8 is too large, a larger area of ​​the laminate 3 is required, resulting in a waste of the laminate 3.

[0086] According to the embodiments of the present utility model, Figure 3 and Figure 5 As shown, the battery cell layer 2 is structured to be divided into two battery groups by the second busbar 22 , each battery group includes a plurality of battery strings, and a plurality of battery cells 21 in the same battery string are connected in series.

[0087] According to the embodiments of the present utility model, Figures 3 to 5 As shown, the battery cells 21 near the first side of the two battery packs are configured to have different spacings from the edge of the laminate 3. And / or, the absolute value of the difference in spacing between the battery cells 21 near the first side of the two battery packs and the edge of the laminate 3 is configured to be less than 0.8 mm.

[0088] In an illustrative embodiment, Figure 3 and Figure 5 As shown, the second busbar 22 is arranged in the longitudinal direction of the battery layer 2 (such as Figure 3 The middle part of the vertical direction shown in the figure) is formed by placing the second busbar 22 on both sides (such as Figure 3The multiple cell pieces 21 (the upper side and the lower side as shown) are separated into two battery groups. The cell pieces 21 of the two battery groups close to the second bus bar 22 are electrically connected to the second bus bar 22 through welding tapes. Among them, each cell piece 21 includes but is not limited to being provided with 2m welding tapes, where m is a natural number greater than or equal to 7 and less than or equal to 10 (i.e., 7 ≤ m ≤ 10). Further, each battery group includes multiple side-by-side battery strings, and the multiple cell pieces in the same battery string are connected in series.

[0089] In a schematic embodiment, as Figure 5 shown, the distance (i.e., d5) between the outermost (i.e., the upper part) cell piece 21 in the battery group located on the left side of the second bus bar 22 and the edge of the laminate 3, and the distance (i.e., d6) between the outermost (i.e., the upper part) cell piece 21 in the battery group located on the right side of the second bus bar 22 and the edge of the laminate 3 are configured to be unequal (i.e., d5 ≠ d6), and the absolute value of the difference between d5 and d6 is configured to be less than 0.8 millimeters (i.e., 丨W1 - W2丨 ≤ 0.8mm, such as 丨W1 - W2丨 = 0.5mm). Thus, the welding tapes by which the cell pieces 21 of the battery groups on both sides are welded to the second bus bar 22 are arranged in a staggered manner. And the photovoltaic module has a set creepage distance. In this way, leakage at the edge of the cell piece can be prevented to improve the withstand voltage performance of the photovoltaic module.

[0090] In a schematic embodiment, as Figure 4 and Figure 5 shown, the width (i.e., W1) of the first bus bar 23 and the width (i.e., W2) of the second bus bar 22 are configured to be different. Specifically, the width (i.e., W1) of the first bus bar 23 is configured to be greater than or equal to 2.5 millimeters and less than or equal to 4 millimeters (i.e., 2.5mm ≤ W1 ≤ 4mm); the width (i.e., W2) of the second bus bar 22 is configured to be greater than or equal to 5 millimeters and less than or equal to 7 millimeters (i.e., 5mm ≤ W1 ≤ 7mm). In a preferred embodiment, W1 can be configured to be 3.5 millimeters (i.e., W1 = 3.5mm), and W2 can be configured to be 6 millimeters (i.e., W2 = 6mm).

[0091] According to an embodiment of the present invention, as Figure 4 shown, the distance between two adjacent cell pieces 21 in the battery string is configured to be -0.5 millimeters to 2 millimeters. And the distance between two adjacent battery strings is configured to be 0.8 millimeters to 2 millimeters.

[0092] In a schematic embodiment, as Figure 4 shown, the battery strings in the battery group are arranged along as Figure 4As shown in the vertical direction, the spacing between two adjacent battery strings (i.e., d4) is configured to be 0.8 mm to 2 mm (0.8 mm ≤ d4 ≤ 2 mm). Furthermore, the spacing between two adjacent battery cells 21 in the same battery pack (i.e., d3) is configured to be -0.5 mm to 2 mm (-0.5 mm ≤ d3 ≤ 2 mm). Among them, the spacing between adjacent battery cells 21 is a negative value, which is characterized by the overlap of two adjacent battery cells 21 (i.e., the orthographic projection along the thickness direction of the battery cell (e.g., Figure 4 In the direction facing the paper surface), the adjacent end portions of two adjacent battery cells overlap, and can be connected by setting an adhesive at the overlapping position; at the same time, a welding strip is configured so that one end of the welding strip is set on the front side of the battery cell and the other end is set on the back side of the battery cell, so that the welding strip passes through the overlapping position of the two battery cells. In a preferred embodiment, the spacing between two adjacent battery cells 21 in the same battery pack can be configured to be 1.1 mm (i.e., d3 = 1.1 mm), and the spacing between battery strings can be configured to be 1.66 mm (i.e., d4 = 1.66 mm).

[0093] In such an embodiment, by designing the spacing between adjacent cells and the spacing between adjacent cell strings, it is beneficial to manufacture the photovoltaic module. If d3 and / or d4 are too small, it is easy to cause the cell 21 to be misaligned, so that the cell 21 contacts other cells 21, thereby forming an extrusion force, causing the cell 21 to crack; if d3 and / or d4 are too large, a larger area of ​​the laminate 3 needs to be configured, resulting in a waste of the laminate 3.

[0094] Figure 6 yes Figure 1 A partial enlarged view of portion D of the photovoltaic module is shown, in which the frame is omitted. Figure 7 yes Figure 1 The partially enlarged view of part E of the photovoltaic module is shown, showing the first outlet.

[0095] According to the embodiments of the present utility model, Figure 1 , Figure 6 and Figure 7 As shown, the sealing layer further includes a back plate, and at least one lead-out port is provided on the back plate, and the lead-out port is configured to partially overlap with the second busbar 22 in the orthographic projection along the thickness direction of the battery cell 21. In this way, the lead-out terminal 221 of the second busbar 22 can be exposed in the lead-out port. According to an embodiment of the utility model, Figure 1 , Figure 6 and Figure 7 As shown, the end of the battery cell 21 adjacent to the lead-out port facing the lead-out port is configured as a chamfered structure. In this way, in the orthographic projection along the thickness direction of the battery cell 21, the lead-out port and the battery cell 21 can be offset.

[0096] In an illustrative embodiment, Figure 1 As shown, the photovoltaic module is provided with four second busbars 22 along the middle, corresponding to the positive and negative electrodes of the two battery packs respectively. Furthermore, the facing ends of the four second busbars 22 form a bent section bent away from the battery layer 2 to serve as a lead-out terminal 221.

[0097] In an illustrative embodiment, Figure 1 As shown, the back plate includes but is not limited to being made of glass. Further, three outlets are provided at positions corresponding to the bending sections formed by the four second busbars 22. Specifically, it includes a first outlet 32 ​​located in the middle, and two second outlets 31 located on both sides of the first outlet 32.

[0098] Figure 8 yes Figure 7 A partial enlarged view of the first outlet is shown.

[0099] According to the embodiments of the present utility model, Figure 7 and Figure 8 As shown, the outlet is configured as an oblong through hole having a major axis and a minor axis, wherein the major axis is configured to be parallel to the second side, and the minor axis is configured to be parallel to the first side.

[0100] According to the embodiments of the present utility model, Figure 7 and Figure 8 As shown, the length of the short axis is configured to be smaller than the sum of the spacing between the two second bus bars 22 exposed to the lead-out port and the battery cells 21 on both sides and the width of the second bus bar 22 .

[0101] According to the embodiments of the present utility model, Figure 7 and Figure 8 As shown, the ratio of the length of the major axis to the length of the minor axis is configured to be 1.2 to 1.5.

[0102] In an illustrative embodiment, Figure 1 and Figure 7 As shown, the first outlet 32 ​​includes but is not limited to being configured as an elongated through hole, and the second outlet 31 includes but is not limited to being configured as a circular through hole. It should be understood that the embodiments of the present utility model are not limited thereto.

[0103] For example, the three lead-out ports can all be configured as through holes in a circular, elliptical, or other shapes suitable for leading out the lead-out terminals 221 .

[0104] In an illustrative embodiment, the photovoltaic module also includes a junction box (not shown in the figure), which is arranged on the outside of the back glass. The junction box is equipped with diodes and wiring points suitable for connecting the positive and negative poles to connect the wiring points to the lead-out terminals 221 provided on the second busbar 22.

[0105] In an illustrative embodiment, Figure 7 As shown, the bent sections formed by the second busbars 22 located on both sides of the first lead-out port 32 extend from the first lead-out port 32 and are suitable for connecting to an external junction box (not shown in the figure). Further, the two lead-out terminals 221 extending from the first lead-out port 32 are configured to be spaced apart in a direction parallel to the first side.

[0106] In an illustrative embodiment, Figure 8 As shown, the first outlet 22 is composed of four arcs, and two arcs arranged opposite to each other are symmetrically arranged. In detail, two of the four arcs are in a circle, and the other two arcs are in an ellipse, and the four arcs are connected end to end in sequence to form the first outlet 22 in an oblong shape. Wherein, the length L2 of the major axis includes but is not limited to being configured to be 12 mm to 18 mm (i.e., 12 mm ≤ L2 ≤ 18 mm), the length L1 of the minor axis includes but is not limited to being configured to be 12 mm to 18 mm (i.e., 10 mm ≤ L2 ≤ 14 mm), and the ratio of the length of the major axis to the length of the minor axis is configured to be 1.2 to 1.5 (i.e., L2 / L1 = 1.2 to 1.5).

[0107] Furthermore, L1 is also configured to be smaller than the sum of the spacing between the two second busbars 22 and the electrically connected battery cells 21 (i.e., d7 and d8) and the width of the lead-out terminal 221 (the width of the lead-out terminal 221 is consistent with the width of the second busbar 22, i.e., W2) (i.e., L1 < d7 + d8 + W2), so that the battery cells 21 near the lead-out port (i.e., Figure 6 and Figure 7 The chamfers provided on the four battery cells (shown as being located at the upper left, lower left, upper right and lower right of the lead-out port) can prevent the battery cell 21 from being exposed in the lead-out port, thereby preventing the battery cell 21 from being broken.

[0108] According to the embodiments of the present utility model, Figure 7 and Figure 8 As shown, the spacing between the two lead terminals 221 exposed to the lead outlet (such as the first lead outlet 32) is configured to be 5 mm to 7 mm, and the ratio of the spacing between the two lead terminals 221 to the length of the major axis is configured to be 0.375 to 0.5. Among them, the lead terminal 221 is configured to have the same width as the second busbar 22, and the ratio of the lead terminal 221 to the length of the minor axis is configured to be 0.4 to 0.6.

[0109] In an illustrative embodiment, Figure 8 As shown, the spacing between the two lead terminals 221 (i.e., d11) is constructed to be greater than or equal to 5 mm and less than or equal to 7 mm (i.e., 5mm≤d11≤7mm), and the ratio of d11 to the major axis L2 is constructed to be 0.375 to 0.5 (i.e., d11 / L2=0.375~0.5), and the ratio of d11 to the minor axis L1 is constructed to be 0.4 to 0.6 (i.e., d11 / L1=0.4~0.6).

[0110] In such an embodiment, the first lead-out port 32 configured as an elongated through hole is adapted to the size of the lead-out terminal 221 formed by the second busbar 22 extending from the first lead-out port 32. Compared with the circular through hole with a diameter of L2, its width dimension (i.e., Figure 8 Compared with the elliptical through hole with L1 as the major axis, its length dimension (i.e. Figure 8 The spacing between the upper end and the lower end as shown is narrower. On the basis of meeting the requirement of accommodating the lead-out terminal 221 (i.e., the bent section) extending from the first lead-out port 32 to be electrically connected to the junction box, the first lead-out port 32 has a smaller opening area and a greater stress load, which can further prevent hidden cracks in the battery cell.

[0111] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only for reference to the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted when they may cause confusion in the understanding of the present invention.

[0112] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present invention is defined by the attached claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic assembly includes a first side extending along a first direction and a second side extending along a second direction, and the first direction intersects with the second direction; The photovoltaic module further comprises: A battery cell layer (2), comprising a plurality of battery cells (21) arranged in a row and column array along the first edge and the second edge; The ratio of the sum of the side lengths of the plurality of battery cells (21) arranged along the first side to the length of the first side is a first ratio, and the first ratio is greater than or equal to 95%, the ratio of the sum of the side lengths of the plurality of battery cells (21) arranged along the second side to the length of the second side is a second ratio, and the second ratio is greater than or equal to 95%; and the absolute value of the difference between the first ratio and the second ratio is less than or equal to 0.8%.

2. The photovoltaic module according to claim 1, characterized in that: The first ratio is greater than the second ratio, and the first side is greater than the second side.

3. The photovoltaic module according to claim 1, characterized in that: The length of the first side is configured to be greater than or equal to 2370 mm and less than or equal to 2390 mm; The length of the second side is configured to be greater than or equal to 1120 mm and less than or equal to 1150 mm.

4. The photovoltaic module according to claim 1, characterized in that: The length of the first side of the battery cell (21) is (190 / n to 195 / n) millimeters, or (207 / n to 212 / n) millimeters; Wherein, n is a natural number greater than or equal to 2, representing the number of battery cells to be cut.

5. The photovoltaic module according to claim 1, characterized in that: It also includes a sealing layer laminated on the front and back sides of the battery layer (2), and the sealing layer and the battery layer (2) form a laminate (3).

6. The photovoltaic module according to claim 5, characterized in that: It also comprises a frame (1), wherein two intersecting sides of the frame (1) define the first side and the second side.

7. The photovoltaic module according to claim 6, characterized in that: The edge of the laminate (3) is inserted into the frame (1), and the distance between the edge of the laminate (3) and the edge of the frame (1) is configured to be 2 mm to 4 mm.

8. The photovoltaic module according to any one of claims 5 to 7, characterized in that: The battery cell layer (2) further comprises a first busbar (23), wherein the first busbar (23) is arranged on one side of the plurality of battery cells and extends along the second direction; The distance between the first busbar (23) and the edge of the laminate (3) is 10 to 15 mm, and the distance between the first busbar (23) and the adjacent battery cell (21) is 2.5 to 5 mm.

9. The photovoltaic module according to any one of claims 5 to 7, characterized in that: The battery cell layer (2) further comprises a second busbar (22), wherein the second busbar (22) is arranged in the middle of the plurality of battery cells and extends along the second direction; The spacing between the second busbar (22) and the adjacent battery cell (21) is configured to be 2.5 to 3.8 millimeters.

10. The photovoltaic module according to claim 9, characterized in that: The battery sheet layer (2) is structured to be divided into two battery groups by the second busbar (22), each of the battery groups comprising a plurality of battery strings, and a plurality of the battery sheets (21) in the same battery string are connected in series.

11. The photovoltaic module according to claim 10, characterized in that: The battery sheets (21) close to the first side in the two battery packs are configured to have different spacings from the edge of the laminate (3); And / or, the absolute value of the difference in the distance between the battery sheet (21) close to the first side of the two battery packs and the edge of the laminate (3) is configured to be less than 0.8 mm.

12. The photovoltaic module according to claim 10, characterized in that: The spacing between two adjacent battery sheets (21) in the battery string is configured to be -0.5 mm to 2 mm; Furthermore, a distance between two adjacent battery strings is configured to be 0.8 mm to 2 mm.

13. The photovoltaic module according to claim 9, characterized in that: The sealing layer comprises a back plate, on which at least one lead-out port is arranged, and the lead-out port is configured to partially overlap with the second busbar (22) in the orthographic projection along the thickness direction of the battery sheet (21).

14. The photovoltaic module according to claim 13, characterized in that: The end of the battery sheet (21) adjacent to the lead-out port and facing the lead-out port is configured as a chamfered structure.

15. The photovoltaic module according to claim 13 or 14, characterized in that: The outlet is an oblong through hole having a major axis and a minor axis, wherein the major axis is configured to be parallel to the second side, and the minor axis is configured to be parallel to the first side.

16. The photovoltaic module according to claim 15, characterized in that: The length of the short axis is configured to be smaller than the sum of the spacing between the two second bus bars (22) exposed to the lead-out port and the battery cells (21) on both sides and the width of the second bus bar (22).

17. The photovoltaic module according to claim 15, characterized in that: The ratio of the length of the major axis to the length of the minor axis is configured to be 1.2 to 1.

5.

18. The photovoltaic module according to claim 15, characterized in that: The spacing between the two lead terminals (221) exposed to the lead outlet is configured to be 5 mm to 7 mm, and the ratio of the spacing between the two lead terminals (221) to the length of the major axis is configured to be 0.375 to 0.5; And / or, the lead terminal (221) is configured to have the same width as the second busbar (22), and the ratio of the length of the lead terminal (221) to the length of the short axis is configured to be 0.4 to 0.6.

Images