Photovoltaic welding equipment

Abstract

The embodiment of the utility model relates to the technical field of photovoltaic modules, and provides photovoltaic welding equipment which comprises a first welding base and a cushion table, the first welding base is provided with a bearing face, and the bearing face is used for bearing a battery piece and a welding strip; the pad tables extend in the width direction of the welding strip, two parallel pad tables are arranged in the bearing face in a protruding mode, the two pad tables are arranged at intervals in the length direction of the welding strip, and the distance between the ends, close to the bearing face, of the two pad tables is smaller than the distance between the ends, away from the bearing face, of the two pad tables. The two cushion tables are used for abutting against the two ends, in the length direction of the welding strip, of the battery piece and the welding strip correspondingly so that the battery piece and the welding strip can be bent by the preset bending radian in the welding process. According to the photovoltaic welding equipment provided by the embodiment of the invention, the problem that the battery piece warps after being welded can be solved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure relates to the technical field of photovoltaic modules, in particular to a photovoltaic welding device. BACKGROUND

[0002] In the manufacturing process of a photovoltaic module, one or more solder strips are needed to connect adjacent cell pieces. In the process of welding the cell pieces and the solder strips, the cell pieces and the solder strips are heated. Due to the different thermal expansion coefficients of the cell pieces and the solder strips, the cell pieces are prone to warping after welding. CONTENT

[0003] The embodiment of the present disclosure provides a photovoltaic welding device, aiming to improve the warping problem of the cell pieces after welding.

[0004] According to some embodiments of the present disclosure, the embodiment of the present disclosure provides a photovoltaic welding device for welding cell pieces and solder strips, which comprises:

[0005] A first welding base, the first welding base has a bearing surface, the bearing surface is used for bearing the cell pieces and the solder strips;

[0006] A pad table, the pad table is arranged along the width direction of the solder strip, two parallel pad tables are arranged in the bearing surface, the two pad tables are arranged in a spaced manner in the length direction of the solder strip, the distance between the two pad tables close to one end of the bearing surface is smaller than the distance between the two pad tables away from the other end of the bearing surface, and the two pad tables are respectively used for abutting the two ends of the cell pieces and the solder strips in the length direction of the solder strip, so that the cell pieces and the solder strips are bent to a preset bending radius during welding.

[0007] In some embodiments, the height of the pad table is 0.1-4mm.

[0008] In some embodiments, the distance between the two pad tables close to one end of the bearing surface is 20-70mm.

[0009] In some embodiments, the inner surfaces of the two pad tables close to each other are both stepped surfaces.

[0010] In some embodiments, the distance between the two pad tables gradually increases from the end close to the bearing surface to the end away from the bearing surface.

[0011] In some embodiments, the inner surfaces of the two pad tables close to each other are both inclined surfaces or concave curved surfaces.

[0012] In some embodiments, the part of the bearing surface between the two pads is concave, so that the curved battery piece and the solder strip are attached to the inner surfaces of the two pads and the bearing surface.

[0013] In some embodiments, the pad and the first welding base are fixed by adhesion.

[0014] In some embodiments, the preset bending curvature is 0.3π-0.8π rad.

[0015] In some embodiments, the photovoltaic welding device further comprises a second welding base having a shaping surface for bearing the battery piece and the solder strip after welding, the shaping surface being convex, and the middle part of the shaping surface being convexly arranged relative to the two ends of the shaping surface in the length direction of the solder strip.

[0016] In some embodiments, the height of the convex middle part of the shaping surface relative to the two ends of the shaping surface in the length direction of the solder strip is 1-3 mm.

[0017] In some embodiments, the size of the shaping surface in the length direction of the solder strip is 156-210 mm.

[0018] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages:

[0019] In the photovoltaic welding device provided by the embodiments of the present disclosure, the bearing surface of the first welding base is provided with two pads, in the process of pressing and welding the battery piece and the solder strip by using the first welding base, the two ends of the battery piece and the solder strip are arranged on the two pads, and the solder strip is arranged on the lower side of the battery piece, so that the two ends of the battery piece are curved upward, and subsequently in the room temperature environment, the degree of cooling and contraction of the solder strip is higher, and the two ends of the battery piece are pulled downward during the contraction of the solder strip, so that the battery piece can be completely or basically restored to a flat state, thereby realizing the shaping treatment of the battery piece and reducing the degree of warping of the battery piece with the solder strip. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are exemplified by pictures in the drawings corresponding thereto, which do not constitute a limitation on the embodiments, unless specifically stated otherwise, and the drawings in the drawings do not constitute a proportional limitation; in order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or in the prior art, the drawings needed in the embodiments will be briefly introduced below, and obviously, the drawings in the following description can also be used to obtain other drawings without creative labor for those skilled in the art.

[0021] Figure 1 A structural schematic diagram of a first welding base in a photovoltaic welding device according to an embodiment of the present disclosure is provided;

[0022] Figure 2 A working principle diagram of the first welding base in the photovoltaic welding device is provided. Figure 1

[0023] Figure 3 A structural schematic diagram of a first welding base in another photovoltaic welding device according to an embodiment of the present disclosure is provided;

[0024] Figure 4 A structural schematic diagram of a second welding base in a photovoltaic welding device according to an embodiment of the present disclosure is provided;

[0025] Figure 5 A working principle diagram of the second welding base in the photovoltaic welding device is provided. Figure 4 DETAILED DESCRIPTION

[0026] As can be known from the background, in the process step of welding the solder strip on the cell sheet, the ductility of the solder strip is greater than that of the cell sheet due to the influence of the welding temperature, so that the extension length of the solder strip is much greater than that of the cell sheet. For example, when the welding temperature is 200℃, the difference between the extension length of the solder strip and that of the cell sheet is as high as 0.22mm. After the subsequent welding is completed, due to the decrease of the ambient temperature, the solder strip cools and shrinks to a greater extent than the cell sheet, so that the solder strip shrinks together with the cell sheet when the solder strip on the cell sheet shrinks, thereby causing the cell sheet to warp.

[0027] The present disclosure provides a photovoltaic welding device, and two pads are arranged on the bearing surface of the first welding base. In the process of pressing and welding the cell sheet and the solder strip by using the first welding base, the two ends of the cell sheet and the solder strip are arranged on the two pads, and the solder strip is arranged on the lower side of the cell sheet, so that the two ends of the cell sheet are warped upward. Subsequently, in the room temperature environment, the solder strip cools and shrinks to a greater extent, and the two ends of the cell sheet are stretched downward during the shrinking process of the solder strip, so that the cell sheet can be completely or basically restored to a flat state, thereby realizing the shaping treatment of the cell sheet and reducing the warping degree of the cell sheet with the solder strip.

[0028] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited. Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces). ​​

[0029] Reference within this document to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to one of ordinary skill in the art, embodiments described herein can be combinable with other embodiments.

[0030] In the description of the embodiments of the present application, the term "and / or" is merely used to describe associated objects, and can represent that there can be three types of relationships, for example, A and / or B can represent that there are A, A and B, and B. In addition, the character " / " in this document generally represents that the front and rear associated objects are in an "or" relationship.

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. For example, if the device or element in the drawing is inverted, the element described as "below" or "under" or "lower" or "bottom" of the other element or feature will be oriented "above" or "top" of the other element or feature. Therefore, the term "below" can cover both upward and downward orientations depending on the context in which the term is used, which will be apparent to one of ordinary skill in the art. The material can be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatially relative descriptors used herein can be interpreted accordingly.

[0032] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] In the drawings corresponding to the embodiments of the present application, the thickness and area of the layers are exaggerated for a better understanding and ease of description. In addition, when it is described that one component is "formed substantially on" another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0034] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components can be further included. A first component being "formed on or above" a second component, or a first component being "formed on the surface of" a second component, or a first component being "formed on the side of" a second component, can include an embodiment in which the first component and the second component are in direct contact, and can also include an embodiment in which an additional component is present between the first component and the second component, so that the first component and the second component can not be in direct contact. For simplicity and clarity, various components can be arbitrarily drawn in different proportions. In the drawings, some layers / components can be omitted for simplicity. As no specific description is given, a first component being "formed on or above" a second component means that the first component is in direct contact with the second component. Among them, the "component" mentioned above can refer to a layer, a film, a region, a part, a structure, etc.

[0035] The terms used in the description of various described embodiments herein are only used to describe specific embodiments, and are not intended to be limiting. As used in the description of various described embodiments and the appended claims, "the component" is also intended to include the plural, unless the context clearly indicates otherwise. Among them, the component includes layers, films, regions, or plates, etc.

[0036] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are presented in order to enable the reader to better understand the present disclosure. However, the technical solutions claimed by the present disclosure can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0037] Figures 1 to 3 The structural schematic diagram of various photovoltaic welding devices provided by the embodiments of the present disclosure.

[0038] Please refer to Figures 1 to 3In some embodiments, the photovoltaic welding device is used for welding of the cell sheet 4 and the solder strip 5, and the photovoltaic welding device comprises a first welding base 1 and a cushion 2, the first welding base 1 has a bearing surface 11 for bearing the cell sheet 4 and the solder strip 5; the cushion 2 is arranged along the width direction of the solder strip 5, and the bearing surface 11 is concavely provided with two parallel cushions 2, the two cushions 2 are arranged at intervals in the length direction of the solder strip 5, the interval of the two cushions 2 close to one end of the bearing surface 11 is smaller than the interval of the two cushions 2 away from the other end of the bearing surface 11, and the two cushions 2 are respectively used for abutting the two ends of the cell sheet 4 and the solder strip 5 in the length direction of the solder strip 5, so that the cell sheet 4 and the solder strip 5 are bent by a predetermined bending radius during the welding process.

[0039] Specifically, the photovoltaic welding device comprises a first welding base 1 and a pressing device (not shown in the figure), the first welding base 1 is used for bearing the cell sheet 4 and the solder strip 5 to be welded, and the pressing device is movably arranged on the upper side of the first welding base 1 relative to the first welding base 1, so that the cell sheet 4 and the solder strip 5 can be pressed by the first welding base 1 and the pressing device. The first welding base 1 and / or the pressing device is provided with a heating device, so that when the cell sheet 4 and the solder strip 5 are pressed by the first welding base 1 and the pressing device, the cell sheet 4 and the solder strip 5 can be heated by the heating device on the first welding base 1 and / or the pressing device to realize the pressing welding of the cell sheet 4 and the solder strip 5.

[0040] The bearing surface 11 of the first welding base 1 is the upper surface of the first welding base 1, and the first welding base 1 can bear the cell sheet 4 and the solder strip 5 to be welded through the bearing surface 11. The bearing surface 11 of the first welding base 1 is concavely provided with two cushions 2, the two cushions 2 are both arranged along the width direction of the solder strip 5 and arranged in parallel or approximately in parallel, the two cushions 2 are arranged at intervals in the length direction of the solder strip 5, the first welding base 1 and the two cushions 2 form a concave structure, and the interval of the lower ends of the two cushions 2 is smaller than the interval of the upper ends of the two cushions 2, so that when the cell sheet 4 and the solder strip 5 to be welded are placed in the bearing surface 11 of the first welding base 1, the two cushions 2 can abut the lower sides of the two ends of the cell sheet 4 and the solder strip 5 in the length direction of the solder strip 5, respectively.

[0041] When the battery piece 4 to be welded and the welding strip 5 are placed in the bearing surface 11 of the first welding base 1, and the welding strip 5 is laid on the lower side of the battery piece 4 (that is, the welding strip 5 is laid on the first welding base 1 first, and then the battery piece 4 is laid on the upper side of the welding strip 5), at this time, the two ends of the battery piece 4 to be welded and the welding strip 5 are supported on the two pads 2, based on the fact that the ductility of the welding strip 5 is better than that of the battery piece 4, and the first welding base 1 is an inner concave structure, so that in the process of the pressing device pressing the welding, the two ends of the battery piece 4 and the welding strip 5 will be curved upward relative to the middle part of the battery piece 4 and the welding strip 5, so that the battery piece 4 and the welding strip 5 are curved upward by a predetermined bending radius during welding. At the same time, due to the fact that the distance between the lower ends of the two pads 2 is less than the distance between the upper ends of the two pads 2, the battery piece 4 and the welding strip 5 can be prevented from being cracked during the bending process. Subsequently, based on the fact that the welding strip 5 has a higher degree of cooling and contraction, the two ends of the battery piece 4 will be stretched downward again during the contraction of the welding strip 5, so as to realize the shaping treatment of the battery piece 4, thereby reducing the warping degree of the battery piece 4 welded with the welding strip 5.

[0042] In the photovoltaic welding device provided by the embodiments of the present disclosure, the bearing surface 11 of the first welding base 1 is provided with two pads 2. In the process of pressing the battery piece 4 and the welding strip 5 by using the first welding base 1, the two ends of the battery piece 4 and the welding strip 5 are supported on the two pads 2, and the welding strip 5 is arranged on the lower side of the battery piece 4, so that the two ends of the battery piece 4 are curved upward. Subsequently, based on the fact that the welding strip 5 has a higher degree of cooling and contraction, the two ends of the battery piece 4 will be stretched downward during the contraction of the welding strip 5, so that the battery piece 4 can be completely or basically restored to a flat state, thereby realizing the shaping treatment of the battery piece 4 and reducing the warping degree of the battery piece 4 welded with the welding strip 5.

[0043] The embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0044] The first welding base 1 and the two pads 2 form an inner concave structure, and the first welding base 1 is concave downward by a predetermined bending radius, so that the battery piece 4 and the welding strip 5 can be bent by a predetermined bending radius during welding. The specific setting mode of the predetermined bending radius can be set according to actual conditions. Optionally, please refer to Figures 1 to 3 In some embodiments, the predetermined bending radius is 0.3π-0.8π rad.

[0045] Specifically, in the process of pressing and welding by using the pressing device, a plurality of contact points in contact with the battery piece 4 and the welding strip 5 will be formed on the two pads 2. The plurality of contact points on the two pads 2 are linearly fitted to obtain a predetermined bending fitting curve. The bending radius of the predetermined bending fitting curve is the predetermined bending radius.

[0046] The preset bending curvature is 0.3π-0.8π rad, for example, the preset bending curvature can be or 0.3π rad, 0.32π rad, 0.34π rad, 0.36π rad, 0.38π rad, 0.4π rad, 0.42π rad, 0.44π rad, 0.46π rad, 0.48π rad, 0.5π rad, 0.52π rad, 0.54π rad, 0.56π rad, 0.58π rad, 0.6π rad, 0.62π rad, 0.64π rad, 0.66π rad, 0.68π rad, 0.7π rad, 0.72π rad, 0.74π rad, 0.76π rad, 0.78π rad, or 0.8π rad, etc. In this way, by preferably selecting the value range of the bending curvature of the downward concave first welding base 1, the battery piece 4 after welding can be completely or basically restored to a flat state.

[0047] The bending curvature of the downward concave first welding base 1 is related to the height of the pad 2 and the distance between the two pads 2, and the distance between the two pads 2 is usually related to the length L1 of the welding strip 5 and the length L2 of the battery piece 4 (the length L2 of the battery piece 4 is the size of the battery piece 4 in the length direction of the welding strip 5), and the length L3 of the first welding base 1 (the length L3 of the first welding base 1 is the size of the first welding base 1 in the length direction of the welding strip 5) is usually greater than the length L2 of the battery piece 4.

[0048] Optionally, referring to Figures 1 to 3 In some embodiments, the distance between the two pads 2 near one end of the bearing surface 11 is 20-70 mm.

[0049] Specifically, the distance between the lower ends of the two pads 2 is less than the distance between the upper ends of the two pads 2, and the distance D1 between the closest parts of the two pads 2 (i.e., the lower ends of the two pads 2) is 20-70 mm, for example, the distance D1 between the closest parts of the two pads 2 can be 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 34 mm, 36 mm, 38 mm, 40 mm, 42 mm, 44 mm, 46 mm, 48 mm, 50 mm, 52 mm, 54 mm, 56 mm, 58 mm, 60 mm, 62 mm, 64 mm, 66 mm, 68 mm, or 70 mm, etc. In this way, by preferably selecting the value range of the distance between the closest parts of the two pads 2, the battery piece 4 after welding can be completely or basically restored to a flat state.

[0050] The specific setting height of the pad 2 can be set according to the actual situation. Optionally, referring to Figures 1 to 3 In some embodiments, the height of the pad 2 is 0.1-4 mm.

[0051] Specifically, the height H1 of the pad 2 is 0.1-4 mm, for example, the height H1 of the pad 2 can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm or 4 mm, etc. Thus, by preferably selecting the height of the pad 2, the battery piece 4 after welding can be completely or substantially restored to a flat state.

[0052] The pad 2 is usually detachably arranged in the bearing surface 11 of the first welding base 1, for example, the pad 2 can be fixed on the first welding base 1 by adhesion, screw fixation or rivet fixation, etc. Alternatively, please refer to Figures 1 to 3 In some embodiments, the pad 2 is adhesively fixed with the first welding base 1. This kind of fixing mode of the first welding base 1 and the pad 2 is relatively simple.

[0053] Please refer to Figure 1 The pad 2 can be a single-layer structure independent component; please refer to Figure 3 The pad 2 can also be an assembly stacked by multiple components. Alternatively, please refer to Figure 3 In some embodiments, the pad 2 includes multiple stacked pieces 21 arranged along the width direction of the welding ribbon 5, and the multiple stacked pieces 21 are arranged in layers along the height direction of the pad 2.

[0054] Specifically, the pad 2 is a multi-layer structure, and the pad 2 is stacked by multiple stacked pieces 21, so that multiple first welding bases 1 with different bending radii can be formed by stacking multiple stacked pieces 21 with different widths. The specific number of stacked pieces 21 included in each pad 2 can be set according to actual conditions, for example, each pad 2 can include two, three, four, five or more stacked pieces 21.

[0055] The pad 2 is usually made of heat-resistant material, and the stacked piece 21 can be a laminated sheet or adhesive tape, etc. Alternatively, please refer to Figures 1 to 3 In some embodiments, the stacked piece 21 is a high-temperature adhesive tape.

[0056] Specifically, the pad 2 is stacked by multiple high-temperature adhesive tapes, and the widths of at least two of the multiple high-temperature adhesive tapes are different, so that the pad 2 is formed in the bearing surface 11 of the first welding base 1 by adhesion of the multiple high-temperature adhesive tapes in the bearing surface 11, and the setting direction of the pad 2 is relatively simple. In the following, the pad 2 adhesively formed by multiple high-temperature adhesive tapes will be taken as an example for introduction.

[0057] The inner surfaces of the two pads 2 are close to each other, and the outer surfaces of the two pads 2 are away from each other, that is, the surface of any one of the two pads 2 close to the other is the inner surface of the any one pad 2, and the surface of any one of the two pads 2 away from the other is the outer surface of the any one pad 2. The specific shape of the inner surface of the two pads 2 can be set according to actual conditions, as long as the distance between the lower ends of the two pads 2 is smaller than the distance between the upper ends of the two pads 2, for example, the inner surface of the pad 2 can be a stepped surface, an inclined surface, or an inner concave curved surface, etc.

[0058] Optionally, referring to Figure 3 In some embodiments, the inner surfaces of the two pads 2 close to each other are both stepped surfaces.

[0059] Specifically, the pad 2 is bonded by multiple layers of high-temperature adhesive tape, the width of the multiple layers of high-temperature adhesive tape gradually increases from top to bottom, and the outer sides of the multiple layers of high-temperature adhesive tape are aligned, thereby forming a stepped surface on the inner side of the multiple layers of high-temperature adhesive tape. The pad 2 with a stepped structure has relatively low processing difficulty.

[0060] Optionally, referring to Figure 1 and Figure 2 In some embodiments, the distance between the two pads 2 gradually increases from the end of the pad 2 close to the bearing surface 11 to the end of the pad 2 away from the bearing surface 11. The distance between the two pads 2 gradually increases from top to bottom, so that the effective support area of the two pads 2 on the battery piece 4 and the solder strip 5 can be increased during the pressing and welding process of the pressing device, thereby avoiding hidden cracks of the battery piece 4 and the solder strip 5.

[0061] Optionally, referring to Figure 1 and Figure 2 In some embodiments, the inner surfaces of the two pads 2 close to each other are both inner concave curved surfaces. By setting the inner surface of the pad 2 as an inner concave curved surface, the effective support area of the two pads 2 on the battery piece 4 and the solder strip 5 can be further increased.

[0062] Further, referring to Figure 1 and Figure 2 In some embodiments, the part of the bearing surface 11 between the two pads 2 is an inner concave curved surface, so that the bent battery piece 4 and the solder strip 5 are attached to the inner surfaces of the two pads 2 and the bearing surface 11.

[0063] Specifically, the bearing surface 11 and the inner surfaces of the two pads 2 are both set as matching inner concave curved surfaces, so that the first welding base 1 is an inner concave curved groove structure. During the pressing and welding process of the pressing device, the bent battery piece 4 and the solder strip 5 can be attached to the inner surfaces of the two pads 2 and the bearing surface 11, so that the effective support area of the first welding base 1 on the battery piece 4 and the solder strip 5 can be maximized as much as possible.

[0064] Optionally, in other embodiments, the inner surfaces of the two adjacent cushion tables 2 are both inclined surfaces.

[0065] Specifically, the inner surface of any one of the cushion tables 2 is gradually inclined from bottom to top towards the outer surface of the any one of the cushion tables 2, so that the cross section of the cushion table 2 is in the shape of a right-angled trapezoid with the upper side smaller than the lower side. The inner surface of the cushion table 2 forms the inclined side of the right-angled trapezoid, and the processing difficulty of the right-angled trapezoidal structure of the cushion table 2 is relatively low.

[0066] The types of the cell pieces 4 include, but are not limited to, Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCON), Heterojunction with Intrinsic Thin-layer (HIT), Back Contact (BC), Perovskite Solar Cells (PSC), etc. Optionally, in some embodiments, the cell pieces 4 are Back Contact cells.

[0067] The length L2 of the cell piece 4 is usually equal to or approximately equal to the length L1 of the solder strip 5. Optionally, please refer to Figures 1 to 3 In some embodiments, the length of the solder strip 5 is greater than the length of the cell piece 4.

[0068] Specifically, the length L1 of the solder strip 5 is lengthened before welding (both the circular solder strip 5 and the rectangular solder strip 5 are applicable), so that the length L1 of the solder strip 5 is greater than the length L2 of the cell piece 4, to reserve the length of the subsequent cooling shrinkage of the solder strip 5 before welding, which is conducive to reducing the degree of warping of the cell piece 4 with the solder strip 5.

[0069] Optionally, please refer to Figures 1 to 3 In some embodiments, the difference between the length L1 of the solder strip 5 and the length L2 of the cell piece 4 is greater than or equal to 0.22 mm.

[0070] Specifically, the length L2 of the battery tab 4 is usually 182mm, and L1-L2 is greater than or equal to 0.22mm, for example, L1-L2 can be 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm or 0.6mm, etc. Thus, by selecting the length difference between the solder strip 5 and the battery tab 4, a suitable length for the subsequent cooling and contraction of the solder strip 5 is reserved before welding.

[0071] Optionally, in other embodiments, the solder strip 5 is provided with a bending treatment.

[0072] Specifically, the solder strip 5 is provided with a bending treatment before welding, which can ensure that the solder strip 5 has sufficient length to surround the battery tab 4 in the inner circle when bending during welding, thereby reserving a length for the subsequent cooling and contraction of the solder strip 5 before welding, which is beneficial to reduce the degree of warping of the battery tab 4 with the solder strip 5.

[0073] The bending position on the solder strip 5 can be set according to actual conditions, for example, the bending position on the solder strip 5 is opposite to the middle position of the two pads on the battery tab 4, because this position is the contraction section of the solder strip 5. Thus, the solder strip 5 is provided with a bending treatment at the contraction section, thereby reserving a length for the subsequent cooling and contraction of the solder strip 5, which is beneficial to reduce the degree of warping of the battery tab 4 with the solder strip 5.

[0074] The bending height of the solder strip 5 can be set according to actual conditions, and optionally, in other embodiments, the bending height of the solder strip 5 is 0.08-0.28mm.

[0075] Specifically, the bending height of the solder strip 5 is 0.08-0.28mm, for example, the bending height of the solder strip 5 can be 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm or 0.28mm, etc. Thus, by selecting the bending height of the solder strip 5, a suitable length for the subsequent cooling and contraction of the solder strip 5 is reserved before welding.

[0076] Optionally, please refer to Figure 4 and Figure 5In some embodiments, the photovoltaic welding equipment further includes a second welding base 3, which has a shaping surface 31 for supporting the welded battery cell 4 and welding strip 5. The shaping surface 31 is an outwardly convex arc surface, and the middle part of the shaping surface 31 protrudes from the two ends of the shaping surface 31 in the length direction of the welding strip 5 in the direction of supporting the battery cell 4 and welding strip 5.

[0077] Specifically, the shaping surface 31 of the second welding base 3 is the upper surface of the second welding base 3. The middle part of the shaping surface 31 protrudes upward relative to both ends of the shaping surface 31 in the length direction of the welding strip 5. The shaping surface 31 of the second welding base 3 is convex arc-shaped. After the welding strip 5 is welded to the battery cell 4, if the battery cell 4 is still bent towards the side with the welding strip 5, the battery cell 4 is placed on the shaping surface 31 of the second welding base 3, with the side of the battery cell 4 with the welding strip 5 facing away from the shaping surface 31, so that the battery cell 4 is shaped by the shaping surface 31, thereby reducing the warping degree of the battery cell 4 with the welding strip 5.

[0078] The length of the shaping surface 31 (the length of the shaping surface 31 is its dimension along the length of the solder strip 5) W1 is usually equal to or approximately equal to the length L2 of the battery cell 4. Alternatively, please refer to... Figure 4 and Figure 5 In some embodiments, the dimension of the shaping surface 31 in the length direction of the solder strip 5 is 156-210 mm.

[0079] Specifically, the length W1 of the shaping surface 31 is 156–210 mm. For example, the length W1 of the shaping surface 31 can be 156 mm, 158 mm, 160 mm, 162 mm, 164 mm, 166 mm, 168 mm, 170 mm, 172 mm, 174 mm, 176 mm, 178 mm, 180 mm, 182 mm, 184 mm, 186 mm, 188 mm, 190 mm, 192 mm, 194 mm, 196 mm, 198 mm, 200 mm, 202 mm, 204 mm, 206 mm, 208 mm, or 210 mm, etc. By optimizing the range of values ​​for the length of the shaping surface 31, it is beneficial to shape the battery cell 4 using the shaping surface 31, thereby reducing the warpage of the battery cell 4 with the solder strip 5 welded on.

[0080] Optionally, please refer to Figure 4 and Figure 5 In some embodiments, the height of the middle part of the shaping surface 31 protruding from both ends of the shaping surface 31 in the length direction of the welding strip 5 is 1 to 3 mm.

[0081] Specifically, the convex height H2 of the shaping surface 31 is 1-3 mm, for example, the convex height H2 of the shaping surface 31 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm or 3 mm, etc. Thus, by preferably selecting the range of the convex height of the shaping surface 31, the battery piece 4 is shaped by the shaping surface 31 to reduce the degree of warping of the battery piece 4 with the solder strip 5 welded.

[0082] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present disclosure, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present disclosure. Any person skilled in the art can make various modifications and modifications without departing from the spirit and scope of the present disclosure, therefore the protection scope of the present disclosure should be limited by the scope defined by the claims.

Claims

1. A photovoltaic soldering apparatus for soldering of a cell sheet with a solder ribbon, characterized by, The photovoltaic welding device comprises: a first welding base having a bearing surface for bearing the cell and the welding strip; two parallel pads arranged in the bearing surface and spaced apart in the length direction of the welding strip, the distance between the two pads close to one end of the bearing surface being smaller than the distance between the two pads away from the other end of the bearing surface, and the two pads being used for abutting the two ends of the cell and the welding strip in the length direction of the welding strip to make the cell and the welding strip bend to a preset bending curvature during welding.

2. The photovoltaic welding apparatus of claim 1, wherein, The height of the pad is 0.1-4 mm; and / or The distance between the two pads close to one end of the bearing surface is 20-70 mm.

3. The photovoltaic welding apparatus of claim 1, wherein, The inner surfaces of the two pads close to each other are both stepped surfaces.

4. The photovoltaic welding apparatus of claim 1, wherein, In the direction from the end of the pad close to the bearing surface to the end away from the bearing surface, the distance between the two pads gradually increases.

5. The photovoltaic welding apparatus of claim 4, wherein, The inner surfaces of the two pads close to each other are both inclined surfaces or concave curved surfaces.

6. The photovoltaic welding apparatus of claim 5, wherein, The part of the bearing surface between the two pads is a concave curved surface to make the bent cell and the welding strip fit the inner surfaces of the two pads and the bearing surface.

7. The photovoltaic welding apparatus of claim 1, wherein, The pad and the first welding base are adhesively fixed.

8. The photovoltaic welding apparatus of claim 1, wherein, The preset bending curvature is 0.3π-0.8π rad.

9. The photovoltaic welding apparatus of claim 1, wherein, The photovoltaic welding device further comprises a second welding base having a shaping surface for bearing the cell and the welding strip after welding, the shaping surface being a convex curved surface, and the middle part of the shaping surface being convexly arranged relative to the two ends of the shaping surface in the length direction of the welding strip to support the cell and the welding strip.

10. The photovoltaic welding apparatus of claim 9, wherein, The height of the convex middle part of the shaping surface relative to the two ends of the shaping surface in the length direction of the welding strip is 1-3 mm; and / or The size of the shaping surface in the length direction of the welding strip is 156-210 mm.

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