Photovoltaikmodul

Abstract

Photovoltaic module (100), comprising a cell strand comprising several cell elements (100), wherein at least one of the cell elements (100) a cell element body (110) with a first surface and a second surface which are opposite to each other in a thickness direction of the cell element body (110), wherein at least one of the first surface and the second surface is defined as a target surface; several first conductor tracks (120) spaced apart from each other on the target surface of the cell element body (110); and several sets of solder pads (130) arranged in a one-to-one correspondence on the first conductor tracks (120), exhibits; and Solder strips (200) arranged in a one-to-one correspondence with the solder pad sets (130), wherein the solder pad sets (130) of two adjacent cell elements (100) are electrically connected to each other by corresponding solder strips (200); wherein at least one of the first conductor tracks (120) has two ends which are located in a direction of travel of the first conductor track (120) on two opposite sides of a corresponding solder pad set (130); wherein, in the case of the two adjacent cell elements (100), one end (121) of the two ends (121) of a cell element (100) that is arranged adjacent to another cell element (100) is defined as a target end (121); wherein at least one of the solder strips (200) is spaced apart in a thickness direction of the cell element body (110) from the target end (121) of a corresponding first conductor track (120).

Description

TECHNICAL AREA

[0001] The present application concerns the field of photovoltaic technology and in particular a photovoltaic module. GENERAL STATE OF THE ART

[0002] A photovoltaic module typically has several cell elements and solder strips, with two adjacent cell elements being electrically connected by the solder strips, allowing the multiple cell elements to be connected to form a cell string.

[0003] However, the yield of the photovoltaic module according to the current state of the art is relatively low. BRIEF SUMMARY OF THE INVENTION

[0004] In view of this, to solve the above technical problems, a photovoltaic module is provided which can reduce the breakage rate of the cell elements of the photovoltaic module and thereby improve the yield of the photovoltaic module, and an exemplary manufacturing method which does not form part of the present invention is described.

[0005] According to a first aspect of the present application, a photovoltaic module is provided that comprises a cell string and solder strips. The cell string has several cell elements. At least one of the cell elements has a cell element body, several first conductor tracks, and several sets of solder pads. The cell element body has a first surface and a second surface that are opposite to each other in a thickness direction of the cell element body. At least one of the first surface and one of the second surfaces is defined as a target surface. The several first conductor tracks are spaced apart from each other on the target surface of the cell element body. The solder pads are arranged on the first conductor tracks in a one-to-one correspondence. The solder strips are arranged in a one-to-one correspondence with the solder pads. The solder pads of two adjacent cell elements are electrically connected to each other by the corresponding solder strip.The first conductor track has two ends located on opposite sides of the corresponding solder pad set along the first conductor track's path. For two adjacent cell elements, one end of the two ends of a cell element adjacent to another cell element is defined as a target end. At least one of the solder pads is spaced from the target end of a corresponding first conductor track along the thickness of the cell element body.

[0006] In one embodiment, the distance between the solder strip and the target end of the corresponding first conductor track in the thickness direction of the cell element body is in a range of 10 µm to 500 µm.

[0007] In one embodiment, the size of the target end in a direction extending from one of the two adjacent cell elements to the other of the two adjacent cell elements lies in a range of 3 mm to 10 mm.

[0008] In one embodiment, the photovoltaic module further comprises a spacer layer. The spacer layer is provided on the target surface of at least one of two adjacent cell elements to cover the target end. The cell element of two adjacent cell elements that is provided with the spacer layer is defined as a target cell element, and a section of the solder strip is located on one side of the spacer layer facing away from the target cell element.

[0009] In one embodiment, the thickness of the spacer layer is in the range of 10 µm to 500 µm; and / or The size of the spacer layer in a direction running from one of the two adjacent cell elements to the other of the two adjacent cell elements lies in a range of 3 mm to 10 mm.

[0010] In one embodiment, at least one of the solder pad sets has several solder pads spaced apart from each other in one direction of the first conductor track. In the direction running from one of the two adjacent cell elements to the other of the two adjacent cell elements, the spacer layer is spaced away from an adjacent solder pad, and a distance between the spacer layer and the adjacent solder pad is defined as L, where 0 mm < L ≤ 2 mm.

[0011] In one embodiment, a material of the spacer layer contains an insulating material; and / or The spacer layer is elastic.

[0012] In one embodiment, at least one of the solder pad sets has several solder pads spaced apart from each other in the direction of the first conductor track. The cell element has two opposing edge sections in the direction running from one of two adjacent cell elements to the other. In the direction running from one of the two adjacent cell elements to the other, there is a distance between the edge sections and the adjacent solder pad in a range of 2 mm to 12 mm.

[0013] An exemplary method for manufacturing a photovoltaic module, which is not part of the present invention, is provided, comprising the provision of a cell string having several cell elements; wherein at least one of the cell elements has a cell element body, several first conductor tracks and several sets of solder pads; wherein the cell element body has a first surface and a second surface opposite to each other in a thickness direction of the cell element body, and at least one of the first surface and the second surface is defined as a target surface; wherein the several first conductor tracks are spaced apart from each other on the target surface of the cell element body, and wherein the sets of solder pads are arranged on the first conductor tracks in a one-to-one correspondence;wherein at least one of the first conductor tracks has two ends which are located on two opposite sides of the corresponding solder pad set in a direction of travel of the first conductor track; wherein, in the case of two adjacent cell elements, one end of the two ends of a cell element which is arranged adjacent to another cell element is defined as a target end; and comprising the electrical connection of the solder pad sets of two adjacent cell elements by corresponding solder strips, wherein at least one of the solder strips is spaced apart from the target end of the corresponding first conductor track in the thickness direction of the cell element body.

[0014] In one example, the exemplary method, which does not form part of the present invention, comprises, prior to electrically connecting the solder pad sets of the two adjacent cell elements by the corresponding solder strips, wherein at least one of the solder strips is spaced apart in the thickness direction of the cell element body from the target end of the corresponding first conductor track, further forming a spacer layer on the target surface of at least one of two adjacent cell elements in order to cover the target end.

[0015] In the technical solutions of the present application, spacing the solder tape away from the target end of the corresponding first conductor track is advantageous in reducing the risk of the solder tape soldering to the target end of the corresponding first conductor track. This reduces the probability that the section of the solder tape corresponding to the target end will be soldered and increases the range of motion of the solder tape at the connection between the two adjacent cell elements. Consequently, the increased risk of cell element breakage due to soldering the solder tape to the edge of the first conductor track can be prevented. This is advantageous in reducing the breakage rate of the cell elements of the photovoltaic module to a certain extent, thereby improving the yield of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a schematic diagram of the structure of a cell element according to an embodiment of the present application. Fig. Figure 2 shows a schematic diagram of a photovoltaic module according to an embodiment of the present application. Fig. Figure 3 shows a partially schematic assembly view of the cell element, a solder strip and a spacer layer according to an embodiment of the present application.

[0016] Reference symbols: 100, cell element; 110, cell element body; 101, edge section; 120, first conductor track; 121, end; 130, solder pad set; 131, solder pad; 140, edge conductor track; 150, second conductor track; 200, solder tape; 300, spacer layer. DETAILED DESCRIPTION

[0017] To make the objectives, features, and advantages of the present application more obvious and understandable, specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings. Many specific details are disclosed in the following description to facilitate a comprehensive understanding of the present application. However, the present application can be implemented in various ways that differ from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0018] With regard to the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "above", "below", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationships shown in the accompanying drawings and are intended only to facilitate and simplify the description of the present application and are not intended to indicate or suggest that the devices or elements in question must have a particular orientation or be assembled or operated in a particular orientation, and therefore should not be interpreted as a limitation of the present application.

[0019] Furthermore, the terms "first" and "second" are used solely for descriptive purposes and should not be interpreted as indicating or suggesting a relative importance or the number of technical features described. Therefore, the features defined by "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "several" means at least two, such as two, three, etc., unless expressly and specifically defined otherwise.

[0020] In the present application, the terms "install," "connect," "couple," "fix," and the like should be understood in their broadest sense, unless expressly specified and defined otherwise. Unless expressly defined otherwise, they may, for example, refer to a permanent connection, a detachable connection, or a one-piece connection; to a mechanical connection or an electrical connection; and to a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interaction between two elements. The specific meanings of these terms in the present application can be understood by persons skilled in the art based on specific circumstances.

[0021] When the present application expresses that a first element is located "on" or "under" a second element, it may be in direct contact with the second element or in indirect contact with the second element via an intermediary, unless expressly stated and defined otherwise. When it expresses that a first element is located "above," "above," or "on" a second element, it may be located directly above or diagonally above the second element, or simply at a higher level than the second element. When it expresses that a first element is located "below," "below," or "under" a second element, it may be located directly below or diagonally below the second element, or simply at a lower level than the second element.

[0022] It should be noted that an element described as being “fixed” to or “arranged on” another element may be provided directly on the other element, or an intermediate element may be present. Terms such as “vertical”, “horizontal”, “above”, “below”, “left”, “right”, and similar expressions used in the present application are for illustrative purposes only and are not intended to represent the sole embodiment.

[0023] A photovoltaic module typically has several cell elements and solder strips, with two adjacent cell elements being electrically connected by the solder strips, allowing the multiple cell elements to be connected to form a cell string.

[0024] However, in state-of-the-art photovoltaic modules, the solder strips tend to be soldered at the edges of the conductor tracks of the cell elements, which leads to a higher breakage rate of the cell elements of the photovoltaic module, which in turn leads to a low yield of the state-of-the-art photovoltaic module.

[0025] To solve the aforementioned technical problems, the present application designs a photovoltaic module that can reduce the occurrence of solder strips soldered to the edges of the first conductor tracks of the cell elements, thereby reducing the breakage rate of the cell elements of the photovoltaic module and thus improving the yield of the photovoltaic module.

[0026] Fig. Figure 1 shows a schematic diagram of the structure of a cell element according to an embodiment of the present application. Fig. Figure 2 shows a schematic diagram of a photovoltaic module according to an embodiment of the present application. Fig. Figure 3 shows a partially schematic assembly view of the cell element, a solder strip and a spacer layer according to an embodiment of the present application.

[0027] With reference to Fig.Figures 1 to 3 describe an embodiment of the present application, comprising a photovoltaic module with a cell string and solder pads 200. The cell string has several cell elements 100. Each cell element 100 has a cell element body 110, several first conductor tracks 120, and several solder pad sets 130. In one thickness direction of the cell element body 110, the cell element body 110 has a first surface and a second surface that are opposite to each other. At least one of the first surface and one of the second surface is defined as a target surface. That is, the first surface can be the target surface; alternatively, the second surface can be the target surface; and alternatively, both the first surface and the second surface can be the target surface.

[0028] The first several conductor tracks 120 are spaced apart from each other on the target surface of the cell element body 110. The solder pad sets 130 are arranged on the first conductor tracks 120 in a one-to-one correspondence. The solder strips 200 are arranged in a one-to-one correspondence with the solder pad sets 130. The solder pad sets 130 of two adjacent cell elements 100 are electrically connected to each other by corresponding solder strips 200.

[0029] Each solder pad set 130 has several solder pads 131 that are spaced apart from each other in a direction of the first conductor track 120.

[0030] The first conductor tracks 120 can extend longitudinally in a longitudinal direction L of the cell element body 110, or the first conductor tracks 120 can extend longitudinally in a lateral direction W of the cell element body 110; there is no specific restriction in this regard. The longitudinal direction L of the cell element body 110, the lateral direction W of the cell element body 110, and the thickness direction D of the cell element body 110 are orthogonal to each other.

[0031] The expression "the solder pad sets 130 of two adjacent cell elements 100 are electrically connected to each other by corresponding solder strips 200" means that, in the two adjacent cell elements 100, at least a portion of the solder pads 131 in the solder pad set 130 of one cell element 100 is electrically connected to the corresponding solder strips 200, while at least a portion of the solder pads 131 in the solder pad set 130 of the other cell element 100 is electrically connected to the corresponding solder strips 200. This means that there is no specific limitation here, and either a portion of the solder pads 131 in the solder pad set 130 of one of the two adjacent cell elements 100 may be electrically connected to the corresponding solder strips 200, or all solder pads 131 in the solder pad set 130 of one of the two adjacent cell elements 100 may be electrically connected to the corresponding solder strips 200.

[0032] Since the solder pad sets 130 of two adjacent cell elements are electrically connected to each other by the corresponding solder strips 200, the two adjacent cell elements 100 can be connected in series by the corresponding solder strips 200. In this way, the multiple cell elements 100 can be connected in series to form the cell string.

[0033] Furthermore, since the several first conductor tracks 120 are spaced apart from each other and the first conductor tracks 120 extend longitudinally in the longitudinal direction L of the cell element body 110 or in the lateral direction W of the cell element body 110, the first conductor tracks 120 are not arranged in a harpoon structure, which prevents excessive thickness at the ends 121 of the first conductor tracks 120, which can occur in the harpoon structure, and thereby reduces the probability of breakage of the cell elements.

[0034] The first conductor track 120 has two ends 121. These two ends 121 are located on opposite sides of a corresponding solder pad set 130 in the direction of the first conductor track 120. For two adjacent cell elements 100, one end 121 of the two ends 121 of a cell element 100 that is closer to the other cell element 110 is defined as a target end. The solder pad 200 is spaced from the target end of the corresponding first conductor track 120 in the thickness direction of the cell element body 110.

[0035] Optionally, prior to soldering the solder pad set 130 to the corresponding solder tape 200, a temporary component is temporarily provided at the target end to space the solder tape 200 from the target end of the corresponding first conductor track 120, and the temporary component is removed after soldering. Alternatively, prior to soldering the solder pad set 130 to the corresponding solder tape 200, a component such as a spacer layer 300 as described below is provided at the target end to space the solder tape 200 from the target end of the corresponding first conductor track 120, with the spacer layer 300 being retained after soldering. Of course, the solder tape 200 can be spaced from the target end of the corresponding first conductor track 120 in other ways, for which there is no specific limitation herein.

[0036] Spacing the solder strip 200 away from the target end of the corresponding first conductor track 120 is beneficial in reducing the risk of the solder strip 200 soldering to the target end of the corresponding first conductor track 120. This reduces the probability that the section of the solder strip 200 corresponding to the target end will be soldered and increases the clearance of the solder strip 200 at the connection between the two adjacent cell elements 100. Consequently, the increased risk of cell element breakage due to soldering the solder strip 200 to the edge of the first conductor track 120 can be prevented. This is beneficial in reducing the breakage rate of the cell elements of the photovoltaic module to a certain extent, thereby improving the yield of the photovoltaic module.If the solder tape 200 is soldered to the edge of the first conductor track 120, the thickness at one edge of the cell element 100 becomes excessively high, leading to an increased risk of breakage of the cell elements.

[0037] In some embodiments, the distance between the solder strip 200 and the target end of the corresponding first conductor track 120 in the thickness direction of the cell element body 110 is in a range of 10 µm to 500 µm.

[0038] For example, the distance between the solder strip 200 and the target end of the corresponding first conductor track 120 in the thickness direction of the cell element body 110 is 10 µm, 100 µm, 200 µm, 300 µm, 400 µm or 500 µm.

[0039] If the distance between the solder strip 200 and the target end of the corresponding first conductor track 120 in the thickness direction of the cell element body 110 is too small, the risk of the section of the solder strip 200 corresponding to the target end being soldered may increase. If the distance between the solder strip 200 and the target end of the corresponding first conductor track 120 in the thickness direction of the cell element body 110 is too large, the thickness at the edge of the cell element 100 will be too great, which in turn increases the risk of breakage of the cell elements 100. Therefore, by adjusting the distance between the solder strip 200 and the target end of the corresponding first conductor track 120 in the thickness direction of the cell element body 110 to a suitable range, i.e.,, in the range of 10 µm to 500 µm, not only is the risk reduced that the section of the solder strip 200 corresponding to the target end is soldered, but the thickness at the edge of the cell element 100 is also controlled within a suitable range, thereby reducing the risk of breakage of the cell element and improving the yield of the photovoltaic module.

[0040] In some embodiments, the size of the target end in a direction extending from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100 lies in a range of 3 mm to 10 mm.

[0041] The size of the target end in the direction that runs from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100 is a target end width.

[0042] For example, the width of the target end is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0043] If the width of the target end is too small, the risk of soldering the section of solder strip 200 corresponding to the target end increases. If the width of the target end is too large, the multiple solder pads 131 of the solder pad set 130 are too closely spaced, increasing the difficulty of soldering the solder pad set 130 to the solder strip 200. Therefore, the width of the target end must be set within a suitable range, for example, between 3 mm and 10 mm. This not only reduces the risk of soldering the section of solder strip 200 corresponding to the target end but also facilitates soldering the multiple solder pads 131 of the solder pad set 130 to the corresponding solder strip 200.

[0044] In some embodiments, the photovoltaic module further comprises a spacer layer 300. The spacer layer 300 is provided on the target surface of at least one of the two adjacent cell elements to cover the target end. The cell element 100 of the two adjacent cell elements 100 that is provided with the spacer layer 300 is defined as a target cell element. A section of the solder strip 200 is located on a side of the spacer layer 300 that faces away from the target cell element.

[0045] It should be understood that the spacer layer 300 is located on one side of the solder pad set 130 at the target cell element, which is adjacent to the other of the two adjacent cell elements 100, in the direction that runs from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100.

[0046] By using the spacer layer 300, the solder strip 200 can be effectively spaced away from the target end of the corresponding first conductor track 120, thereby preventing the increased risk of cell element breakage due to soldering the solder strip 200 to the edge of the first conductor track 120, which reduces the breakage rate of the cell elements of the photovoltaic module to a certain extent and improves the yield of the photovoltaic module.

[0047] In some embodiments, the thickness of the spacer layer 300 is in a range of 10 µm to 500 µm.

[0048] For example, the thickness of the spacer layer is 300 10 µm, 50 µm, 100 µm, 200 µm, 300 µm, 400 µm or 500 µm.

[0049] If the thickness of the 300 mm spacer layer is too small, the manufacturing process becomes more difficult. If the thickness of the 300 mm spacer layer is too large, the thickness of the 100 mm cell element at its edge becomes excessive, which tends to increase the risk of cell element breakage. Therefore, the thickness of the 300 mm spacer layer must be set within a suitable range, i.e., between 10 µm and 500 µm. This not only reduces the risk of soldering the section of the 200 mm strip corresponding to the target end but also controls the thickness of the 100 mm cell element at its edge within a suitable range, thereby reducing the risk of cell element breakage and improving the yield of the photovoltaic module.

[0050] In some embodiments, the width of the spacer layer 300 in the direction running from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100 is in a range of 3 mm to 10 mm.

[0051] The size of the spacer layer 300 in the direction that runs from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100 is a width of the spacer layer 300.

[0052] For example, the width of the spacer layer 300 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0053] If the width of the spacer layer 300 is too small, the risk of soldering the solder strip 200 to the edge of the first conductor track 120 increases. If the width of the spacer layer 300 is too large, the spacer layer 300 will likely cover the solder pad set 130, increasing the probability of a soldering defect for the outermost solder pad 131 in the solder pad set 130. Therefore, the width of the spacer layer 300 must be set within a suitable range, and if the width of the spacer layer 300 is set, for example, within a range of 3 mm to 10 mm, this not only reduces the risk of the solder strip 200 being soldered to the edge of the first conductor track 120, thereby reducing the risk of breakage of the cell elements, but also allows the solder pads 131 in the solder pad set 130 to be firmly soldered to the corresponding solder strip 200, thereby increasing the yield of the photovoltaic module.

[0054] In some embodiments, the spacer layer 300 is spaced from the adjacent solder pad 131 in the direction running from one of two cell elements 100 to the other of the two adjacent cell elements 100, and a distance between the spacer layer 300 and the adjacent solder pad 131 is defined as L, where 0 mm < L ≤ 2 mm.

[0055] For example, the distance between the spacer layer 300 and the adjacent solder pad 131 is 0.1 mm, 0.5 mm, 1 mm or 2 mm.

[0056] If the distance between the spacer layer 300 and the adjacent solder pad 131 is too small, for example, if the distance between the spacer layer 300 and the adjacent solder pad 131 is zero, the probability of a soldering defect for the outermost solder pad 131 in the solder pad set 130 increases. If the distance between the spacer layer 300 and the adjacent solder pad 131 is too large, the risk of the solder tape 200 being soldered to the edge of the first conductor track 120 increases.

[0057] Therefore, the distance between the spacer layer 300 and the adjacent solder pad 131 must be set in a suitable range, such as 0 mm < L < 2 mm, which not only effectively reduces the risk of the solder strip 200 being soldered to the edge of the first conductor track 120, thereby reducing the risk of breakage of the cell elements, but also allows the solder pads 131 in the solder pad set 130 to be firmly soldered to the corresponding solder strip 200, thereby increasing the yield of the photovoltaic module.

[0058] Optionally, in the direction running from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100, a side of the spacer layer 300, which is away from the adjacent solder pad 131, is aligned with an edge section 101 of the cell element 100.

[0059] In some embodiments, a material of the spacer layer 300 contains an insulating material.

[0060] This reduces the probability that the solder strip 200 will be soldered onto the spacer layer 300, thereby improving the reliability and yield of the photovoltaic module.

[0061] In some embodiments, the spacer layer 300 can be elastic.

[0062] The elastic spacer layer 300 can increase the impact resistance of the cell element 100, thereby reducing the risk of breakage of the cell elements and improving the yield of the photovoltaic module.

[0063] In some embodiments, the spacer layer 300 contains an insulating material and the spacer layer 300 is elastic.

[0064] For example, the spacer layer material 300 contains one or more components made of an ethylene-vinyl acetate copolymer (EVA), a polyolefin elastomer (POE), expanded polyethylene (EPE), polyvinyl butyral (PVB), polyethylene terephthalate (PET), polyvinyl chloride (PVC), a thermoplastic polyurethane elastomer (TPU), polycarbonate (PC) or polyvinylidene fluoride (PVDF).

[0065] In some embodiments, each solder pad set 130 has several solder pads 131 spaced apart from one another in the direction of the first conductor track 120. In the direction running from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100, the cell element 100 has two edge sections 101 that are opposite to each other. In the direction running from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100, there is a distance between the edge section 101 and the adjacent solder pad 131 in a range of 2 mm to 12 mm.

[0066] For example, the distance between the edge section 101 and the adjacent solder pad 131 in the direction running from one of two adjacent cell elements 100 to the other of the two adjacent cell elements 100 is 2 mm, 4 mm, 6 mm, 8 mm, 10 mm or 12 mm.

[0067] If the distance between the edge section 101 and the adjacent solder pad 131 is too narrow, the target end, located on an outer side of the solder pad set 130, is too narrow, leading to the risk of the solder strip 200 being soldered to the edge of the first conductor track 120. If the distance between the edge section 101 and the adjacent solder pad 131 is too wide, the range of movement of the solder strip 200 is too large, increasing the risk of a soldering defect.Therefore, the distance between the edge section 101 and the adjacent solder pad 131 must be set in a suitable range, such as 2 mm to 12 mm, which not only effectively reduces the risk of the solder strip 200 being soldered to the edge of the first conductor track 120, thereby reducing the risk of breakage of the cell elements, but also allows the solder pads 131 in the solder pad set 130 to be firmly soldered to the corresponding solder strip 200, thereby increasing the yield of the photovoltaic module.

[0068] In some embodiments, the cell element 100 further comprises two edge conductors 140 and several second conductors 150 arranged on the target surface. One of the edge conductors 140 is electrically connected to one end of each of the first conductors 120 on the target surface. The other edge conductor 140 is electrically connected to the other end of each of the first conductors 120 on the target surface. The several first conductors 120 are spaced apart from one another in one direction from the longitudinal direction L of the cell element 100 and the lateral direction W of the cell element 100. The several second conductors 150 are spaced apart from one another in the other direction from the longitudinal direction L of the cell element 100 and the lateral direction W of the cell element 100. The second conductors 150 are electrically connected to the first conductors 120. The second conductors 150 are electrically connected to the cell element body 110.

[0069] It should be understood that the first conductor tracks 120 can be electrically connected to the cell element body 110.

[0070] For example, the several first conductor tracks 120 are spaced apart in the longitudinal direction L of the cell element 100, while the several second conductor tracks 150 are spaced apart in the lateral direction W of the cell element 100.

[0071] Both the edge conductors 140 and the first conductors 120 are busbars. The second conductors 150 are fingers. During operation of the photovoltaic module, the multiple second conductors 150 can collect electrical currents generated by the photovoltaic effect, and the multiple first conductors 120 can collect the electrical currents collected by the multiple second conductors 150 and then output the collected currents.

[0072] The cell element of the photovoltaic module can be a back-contact cell (BC), a passivated tunnel oxide contact solar cell (TOPCon), a cell with a passivated emission electrode and back side (PERC), a heterojunction cell with intrinsic thin film (HJT), etc.

[0073] The conductive traces of the passivated tunnel oxide contact solar cell (TOPCon), the cell with passivated emission electrode and backside (PERC), or the heterojunction cell with intrinsic thin film (HJT) can have the first conductive traces 120, edge conductive traces 140, and second conductive traces 150 described above. In some other embodiments, when the cell element 100 of the photovoltaic module is a back-contact cell, i.e., the photovoltaic module is a back-contact photovoltaic module, the first surface of the cell element 100 is a front surface, the second surface of the cell element 100 is a back surface, and several first conductive traces 120 and several second conductive traces 150 (not shown) are arranged on the back surface of the cell element 100. The first conductive traces 120 serve as busbars, while the second conductive traces 150 serve as fingers.The multiple first conductor tracks 120 on the back surface of the cell element 100 comprise multiple first sub-conductors and multiple second sub-conductors arranged alternately. Each of the first and second sub-conductors has two ends 121. The multiple second conductor tracks 150 on the back surface of the cell element 100 comprise multiple third sub-conductors and multiple fourth sub-conductors spaced apart from one another. The first and third sub-conductors are orthogonal to each other and both run parallel to the back surface. Each first sub-conductor is electrically connected to its adjacent third sub-conductor. This allows all first sub-conductors to be configured to collect electrical currents gathered by all third sub-conductors.The second and fourth sub-traces are orthogonal to each other and both run parallel to the back surface. Every second sub-traceive is electrically connected to its adjacent fourth sub-traceive. This allows all second sub-traces to be configured to collect electrical currents gathered by all fourth sub-traces. Several solder bands 200 comprise a first solder band corresponding to the first sub-traceive and a second solder band corresponding to the second sub-traceive. Thus, the first solder band is spaced in the thickness direction of the cell element body 110 from the target end of the corresponding first sub-traceive, and the second solder band is spaced from the target end of the corresponding second sub-traceive.

[0074] Furthermore, an example provides a method for manufacturing a photovoltaic module, which does not form part of the present invention and comprises the following steps: S11, the provision of a cell strand comprising several cell elements 100, wherein the cell element 100 comprises a cell element body 110, several first conductor tracks 120, and several solder pad sets 130; wherein the cell element body 110 has, in a thickness direction of the cell element body 110, a first surface and a second surface that are opposite to each other, wherein at least one of the first surface and the second surface is defined as a target surface; wherein the several first conductor tracks 120 are spaced apart from each other on the target surface of the cell element body 110, and the solder pad sets 130 are arranged in a one-to-one correspondence on the first conductor tracks 120; wherein at least one of the first conductor tracks 120 has two ends 121, and the two ends 121 are arranged in a direction of travel of the first conductor track 120 on two opposite sides of a corresponding solder pad set 130; and S20, the electrical connection of the solder pad sets 130 of two adjacent cell elements 100 by a corresponding solder strip 200, wherein the solder strip 200 is spaced apart in the thickness direction of the cell element body 110 from a target end of the corresponding first conductor track 120.

[0075] In this way, the risk of soldering the section of the solder strip 200 corresponding to the target end can be reduced, thus increasing the range of motion of the solder strip 200 at the connection between the two adjacent cell elements 100, which helps to reduce an increased risk of cell element breakage due to soldering the solder strip 200 at the edge of the first conductor track 120, thereby reducing the breakage rate of the cell elements of the photovoltaic module to a certain extent and thus improving the yield of the photovoltaic module.

[0076] Optionally, the method for manufacturing the photovoltaic module, which does not form part of the present invention, further comprises, prior to step S20, the following:

[0077] S12, the formation of a spacer layer 300 on the target surface of at least one of two adjacent cell elements 100 to cover the target end.

[0078] By using the spacer layer 300, the solder strip 200 can be effectively spaced away from the target end of the corresponding first conductor track 120, which prevents the increased risk of cell breakage due to soldering the solder strip 200 to the edge of the first conductor track 120, reduces the breakage rate of the cell elements of the photovoltaic module to a certain extent and thereby improves the yield of the photovoltaic module.

[0079] The technical features of the aforementioned embodiments can be combined in any way. To keep the description concise, not all possible combinations of the technical features are described in the embodiments. However, as long as there is no contradiction among these technical features, the combinations should be considered to be within the scope of the present application.

[0080] The embodiments described above are merely several implementations of the present application, and the descriptions are relatively specific and detailed; however, they should not be regarded as limiting the scope of the present application. Persons skilled in the art should understand that various modifications and improvements can be made without departing from the concept of the present application and that they all fall within the scope of protection of the present application. Therefore, the patent protection of the present application is to be defined by the accompanying claims.

[0081] A photovoltaic module and an exemplary manufacturing process for it, which does not form part of the present invention, are disclosed. The photovoltaic module comprises a cell string and solder strips. The cell string comprises several cell elements. At least one of the cell elements comprises a cell element body, several first conductor tracks, and several sets of solder pads. The several first conductor tracks are spaced apart from one another on a target surface of the cell element body. The solder pads are arranged on the first conductor tracks in a one-to-one correspondence. The solder strips are arranged in a one-to-one correspondence with the solder pads. The solder pads of two adjacent cell elements are electrically connected to each other by a corresponding solder strip. The first conductor track has two ends located on opposite sides of the corresponding solder pad set in the direction of the first conductor track.For two adjacent cell elements, one end of the two ends of a cell element that is adjacent to another cell element is defined as a target end. The solder strip is spaced from the target end of the corresponding first conductor track in a thickness direction of the cell element body.

Claims

[1] Photovoltaic module (100) comprising a cell strand comprising several cell elements (100), wherein at least one of the cell elements (100) a cell element body (110) with a first surface and a second surface which are opposite to each other in a thickness direction of the cell element body (110), wherein at least one of the first surface and the second surface is defined as a target surface; several first conductor tracks (120) spaced apart from each other on the target surface of the cell element body (110); and several sets of solder pads (130) arranged in a one-to-one correspondence on the first conductor tracks (120), exhibits; and Solder strips (200) arranged in a one-to-one correspondence with the solder pad sets (130), wherein the solder pad sets (130) of two adjacent cell elements (100) are electrically connected to each other by corresponding solder strips (200); wherein at least one of the first conductor tracks (120) has two ends which are located in a direction of travel of the first conductor track (120) on two opposite sides of a corresponding solder pad set (130); wherein, in the case of the two adjacent cell elements (100), one end (121) of the two ends (121) of a cell element (100) that is arranged adjacent to another cell element (100) is defined as a target end (121); wherein at least one of the solder strips (200) is spaced apart in a thickness direction of the cell element body (110) from the target end (121) of a corresponding first conductor track (120). [2] Photovoltaic module (100) according to claim 1, wherein a distance between the solder strip (200) and the target end (121) of the corresponding first conductor track (120) in the thickness direction of the cell element body (110) is in a range of 10 µm to 500 µm. [3] Photovoltaic module (100) according to claim 1 or 2, wherein a size of the target end (121) in a direction extending from one of the two adjacent cell elements (100) to another of the two cell elements (100) is in a range of 3 mm to 10 mm. [4] Photovoltaic module (100) according to one of claims 1 to 3, further comprising a spacer layer (300), wherein the spacer layer (300) on the target surface is provided by at least one of the two adjacent cell elements (100) to cover the target end (121); wherein a cell element (100) of two adjacent cell elements (100) which is provided with the spacer layer (300) is defined as a target cell element (100), and a section of the solder strip (200) is located on a side of the spacer layer (300) which is facing away from the target cell element (100). [5] Photovoltaic module (100) according to claim 4, wherein the thickness of the spacer layer (300) is in a range of 10 µm to 500 µm; and / or the size of the spacer layer (300) in a direction extending from one of the two adjacent cell elements (100) to another of the two adjacent cell elements (100) is in a range of 3 mm to 10 mm. [6] Photovoltaic module (100) according to claim 4 or 5, wherein at least one of the solder pad sets (130) has several solder pads (131) spaced apart from each other in a direction of the first conductor track (120); wherein the spacer layer (300) is spaced apart from an adjacent solder pad (131) in the direction which runs from one of the two adjacent cell elements (100) to another of the two adjacent cell elements (100), and a distance between the spacer layer (300) and the adjacent solder pad (131) is defined as L, wherein 0 mm < L ≤ 2 mm. [7] Photovoltaic module (100) according to one of claims 4 to 6, wherein a material of the spacer layer (300) comprises an insulating material, and / or the spacer layer (300) is elastic, and / or a spacer layer material (300) comprising one or more materials consisting of an ethylene-vinyl acetate copolymer, a polyolefin elastomer, expanded polyethylene, polyvinyl butyral, polyethylene terephthalate, polyvinyl chloride, a thermoplastic polyurethane elastomer, polycarbonate or polyvinylidene difluoride. [8] Photovoltaic module (100) according to one of claims 1 to 7, wherein at least one of the solder pad sets (130) has several solder pads (131) spaced apart from each other in the direction of the first conductor track (120); wherein the cell element (100) has two opposite boundary sections (101) in a direction extending from one of two adjacent cell elements (100) to the other of the two adjacent cell elements (100); wherein in the direction which runs from one of the two adjacent cell elements (100) to another of the two adjacent cell elements (100) there is a distance between the edge section (101) and an adjacent solder pad (131) in a range of 2 mm to 12 mm. [9] Photovoltaic module (100) according to claim 6, wherein at least one of the solder pad sets (130) has several solder pads (131) spaced apart from each other in the direction of the first conductor track (120); wherein the cell element (100) has two opposite boundary sections (101) in a direction extending from one of two adjacent cell elements (100) to the other of the two adjacent cell elements (100); wherein in the direction running from one of the two adjacent cell elements (100) to another of the two adjacent cell elements (100) there is a distance between the edge section (101) and an adjacent solder pad (131) in a range of 2 mm to 12 mm; wherein optionally in the direction which runs from one of the two adjacent cell elements (100) to another of the two adjacent cell elements (100), a side of the spacer layer (300) which is away from the adjacent solder pad (131) is aligned with an edge section (101) of the cell element (100). [10] Photovoltaic module (100) according to any one of claims 1 to 9, wherein the cell element (100) further comprises two edge conductors (140) arranged on the target surface, wherein one of the edge conductors (140) is electrically connected to at least one end (121) of the first conductors (120) on the target surface, and another of the edge conductors (140) is electrically connected to at least one end (121) of the first conductors (120) on the target surface; and / or wherein the cell element (100) further comprises several spaced-apart second conductors (150) on the target surface, wherein the second conductors (150) optionally run orthogonally to the first conductors (120).

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