CN218311341U - Welding device and photovoltaic module - Google Patents

Abstract

The utility model discloses a welding set and photovoltaic module relates to the photovoltaic technology field to the welding has the face of weld of interconnection bar to need the problem of more encapsulation glued membranes in the solution busbar. This welding set includes: the welding assembly comprises a first bearing piece, a plurality of welding assemblies and a second bearing piece. Along the length direction of the first bearing piece, a plurality of welding assemblies are arranged on the first bearing piece at intervals. Along the length direction that the second bore the carrier, the second holds the carrier and goes up the interval and offer a plurality ofly and weld the through groove of subassembly one-to-one, and the axis that passes through the groove is unanimous with the width direction that the second bore the carrier. The through groove has a bearing surface for bearing the interconnection bar and the bus bar. The utility model also provides a photovoltaic module, include by above-mentioned technical scheme welding set welded interconnection bar and busbar.

Description

Welding device and photovoltaic module

Technical Field

The utility model relates to a photovoltaic technology field especially relates to a welding set and photovoltaic module.

Background

The photovoltaic module is a device for realizing photoelectric conversion, and generally includes a battery piece, an interconnection bar, a bus bar, a packaging adhesive film, a light-transmitting cover plate, a back plate, a frame, a junction box, and the like. Wherein, a plurality of battery pieces are connected in series by utilizing the interconnection bars to form a battery string. The connection of the plurality of battery strings is realized by using the bus bar to draw out the current of the plurality of battery strings.

In the prior art, the interconnection bar is generally directly welded to the welding surface of the bus bar, and in this case, the total thickness after welding is the sum of the thickness of the interconnection bar and the thickness of the bus bar.

In this process, when the thickness of the bus bar needs to be increased to reduce the electrical loss, the bonding surface of the bus bar to which the interconnection bar is bonded needs more packaging adhesive films.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a welding set and photovoltaic module for reduce the use amount of encapsulation glued membrane, with the cost of manufacture that reduces photovoltaic module.

In order to achieve the above object, in a first aspect, the present invention provides a welding apparatus for welding an interconnection bar and a bus bar. The welding device includes: the first bears weight of, a plurality of welding subassemblies and second and bears the weight of. Along the length direction of the first bearing piece, a plurality of welding assemblies are arranged on the first bearing piece at intervals. Along the length direction that the second bore the carrier, the second holds the carrier and goes up the interval and offer a plurality ofly and weld the through groove of subassembly one-to-one, and the axis that passes through the groove is unanimous with the width direction that the second bore the carrier. The through groove is provided with a bearing surface for bearing the interconnection bar and the bus bar.

Under the condition of adopting the technical scheme, because of the length direction of the second bearing piece, a plurality of through grooves which correspond to the welding assemblies one by one are formed in the second bearing piece at intervals. Therefore, when the welding assembly applies downward pressure to the interconnection bars and the bus bars corresponding to the interconnection bars after the interconnection bars to be welded are correspondingly placed on the bus bars located above the through groove, the bus bars corresponding to the interconnection bars may move in the depth direction of the through groove. At this time, the bus bar corresponding to the interconnection bar is protruded in a direction closer to the through groove than the bus bar of the other region. Based on this, increase the condition of busbar thickness among the prior art, to the face of weld of busbar, the utility model discloses the regional difference in height that has not welded the interconnection bar among well busbar and the interconnection bar welded region and the busbar reduces for same horizontal plane. Therefore, the amount of the packaging adhesive film on the bus bar soldering surface is reduced compared with the prior art when the thickness of the bus bar is increased.

In one implementation, the bearing surface of the through groove and the end surface of the welding assembly are both planes.

In one implementation, the through groove has a bearing surface and the end surface of the welding assembly is curved.

Under the condition of adopting the technical scheme, the shape of the bearing surface of the through groove can be set according to the actual situation, and the selectivity of the second bearing piece is increased. In a similar way, the shape of the end face of the welding assembly can be set according to actual conditions, and the selectivity of the welding assembly is increased. Based on this, make welding set can adapt to different application scenarios, enlarged its application scope.

In one implementation mode, the depth of the through groove is greater than 0mm and less than or equal to the thickness of the interconnection strip.

Adopt under the circumstances of above-mentioned technical scheme, can avoid the weld group to moving to the distance too big to the direction that is close to the through groove to avoid the busbar part that corresponds with the interconnection bar to compare in the convex too much of other regional busbars, and then avoid the utility model discloses the non-welding face of well busbar becomes the face of weld among the prior art, avoids increasing the encapsulation glued membrane volume that the non-welding face of busbar used when the encapsulation glued membrane volume that the face of weld of busbar used reduces. It should be understood that although the non-soldered surfaces of the bus bars are protruded compared to the prior art, there is a margin space where the non-soldered surfaces of the bus bars are located in the actual process of manufacturing the photovoltaic module due to the prior art. Because the degree of depth that link up the groove is greater than 0mm and the thickness that is less than or equal to the interconnection strip again, at this moment, can inject the utility model discloses the not welding face's of well busbar protrusion volume is less than or equal to the holding capacity in surplus space. Therefore, utilize the utility model provides a can not influence the non-face of weld of busbar behind welding set welding interconnection bar and the busbar, and then can not increase the encapsulation glued membrane use amount of the non-face of weld of busbar. Based on this, the utility model discloses compare with the condition that increases busbar thickness among the prior art, reduced the use total amount of encapsulation glued membrane, and then compared the condition that increases busbar thickness among the prior art and reduced photovoltaic module's cost of manufacture.

In one implementation, the depth of the through groove is greater than 0mm and less than or equal to 0.5mm.

Under the condition of adopting the technical scheme, the depth of the through groove can be set according to the actual condition, and the selectivity of the depth of the through groove is increased. Based on this, can further make welding set adapt to different application scenarios, enlarge its application scope.

In one implementation mode, the length of the bearing surface of the through groove and the length of the end face of the welding assembly are both larger than or equal to the width of the bus bar. The longitudinal direction of the bearing surface of the through groove, the longitudinal direction of the end surface of the welding assembly and the width direction of the bus bar are all parallel to the longitudinal direction of the interconnection bar.

Under the condition of adopting the technical scheme, because the length of the bearing surface of the through groove is greater than or equal to the width of the bus bar, at the moment, the bus bar above the through groove is subjected to the same bearing force from the through groove, namely, the bus bar in the area is stressed in a balanced manner, and the probability of damage of the bus bar can be reduced. Because the length of the end face of the welded component is greater than or equal to the width of the bus bar, the bus bar below the welded component is subjected to extrusion force everywhere. Therefore, under the action of the welding assembly, all parts of the bus bars corresponding to the interconnection bars are stressed equally, and deformation amounts are the same. It should be understood that the thickness of the packaging adhesive film covering each position of the bonding surface is substantially uniform or consistent due to the fluidity of the packaging adhesive film at the previous stage. Based on this, when the length of the end face of the solder assembly is greater than or equal to the width of the bus bar, it can be ensured that the amount of the encapsulation adhesive film used at the bus bar soldering face after the interconnection bar and the bus bar are connected is reduced compared with the prior art when the thickness of the bus bar is increased.

In one implementation, the welding assembly includes: connecting piece and welding piece. The connecting piece sets up in first carrier, along the direction of height that first carrier, welding spare and connecting piece telescopic connection.

Under the condition of adopting above-mentioned technical scheme, because the welding subassembly only includes connecting piece and welding spare two parts for the welding subassembly simple structure easily makes. And because the welding piece is telescopically connected with the connecting piece, when the welding piece heats the interconnection bar and the bus bar, the welding piece can be far away from the bus bar and the interconnection bar so as to avoid welding material dregs generated in the heating process from being adhered to the welding piece. Based on this, not only can ensure the normal work of welding, can also reduce or eliminate the probability of later stage clearance welding simultaneously to save the clearance time, improve work efficiency.

In one implementation, the welding part is provided with an air outlet used for assisting in welding the interconnection bar and the bus bar.

By adopting the technical scheme, when hot air is discharged from the air outlet, the welding material of the interconnection bar and the welding material of the bus bar can be melted. When the air outlet hole is blown out cold air or stops blowing out air, the welding materials of the interconnection bar and the bus bar can be mutually fused together, so that the interconnection bar and the bus bar can be welded conveniently.

In a second aspect, the present invention also provides a photovoltaic module, which comprises the above technical solution, the welding device has the welded interconnection bar and the bus bar. Along the length direction of the bus bar, the bus bar comprises a plurality of connecting areas and bearing areas which are alternately distributed. The interconnection strips are arranged in the bearing area, and the bearing area protrudes out of the connection area along the direction far away from the interconnection strips.

Compared with the prior art, the bearing area protrudes out of the connecting area along the direction far away from the interconnection strips. For convenience of description, the surface of the bus bar is divided into a welding surface and a non-welding surface, and the connecting region and the bearing region may both include the welding surface and the non-welding surface according to actual conditions. Compare in the condition that increases busbar thickness among the prior art, to the face of weld of busbar, the utility model discloses the connection region that has not welded interconnection bar among well busbar and the interconnection bar welded bearing area territory and the busbar reduces for the difference in height of same horizontal plane. Therefore, the amount of the packaging adhesive film on the bus bar soldering surface is reduced compared with the prior art when the thickness of the bus bar is increased.

In one implementation, the bearing area has a bearing surface, and the interconnection strips are disposed on the bearing surface, which is a plane or a curved surface.

Under the condition of adopting above-mentioned technical scheme, the shape of above-mentioned loading face can set up according to actual conditions, has increased the selectivity of busbar, makes photovoltaic module can adapt to different application scenarios, has enlarged its application scope.

In one implementation, the height of the bearing region protruding from the connecting region is greater than 0mm and less than the thickness of the interconnection bar.

Adopt under the circumstances of above-mentioned technical scheme, can avoid the busbar part that corresponds with the interconnection bar (be located promptly and bear regional busbar) and compare in the convex too much of busbar that is located connection area's busbar, and then avoid the utility model discloses the non-welding face of well busbar becomes the face of weld among the prior art, avoids increasing the encapsulation glued membrane volume that the non-welding face of busbar used when the encapsulation glued membrane volume that the face of weld of busbar used reduces. It should be understood that although the non-soldering surface of the bus bar is protruded compared to the prior art, the non-soldering surface of the bus bar is located with a margin space in the actual manufacturing process of the photovoltaic module due to the prior art. Because the degree of depth that link up the groove is greater than 0mm and the thickness that is less than or equal to the interconnection strip again, at this moment, can inject the utility model discloses the not welding face's of well busbar protrusion volume is less than or equal to the holding capacity in surplus space. Therefore, utilize the utility model provides a can not influence the non-welding face of busbar behind welding set welding interconnection bar and the busbar, and then can not increase the encapsulation glued membrane use amount of the non-welding face of busbar. Based on this, the utility model discloses compare with the condition that increases busbar thickness among the prior art, reduced the use total amount of encapsulation glued membrane, and then compared the condition that increases busbar thickness among the prior art and reduced photovoltaic module's cost of manufacture.

In one implementation, the bus bar includes: the welding layer is coated on the outer surface of the base body, and the outer surface of the base body comprises a welding surface and a non-welding surface. The welding layer includes: a first solder layer and a second solder layer. The first welding layer is arranged on the welding surface and used for being connected with the interconnection strips. The second welding layer is arranged on the non-welding surface. In the first welding layer and the second welding layer which are oppositely arranged along the thickness direction of the base body, the thickness of the first welding layer is larger than or equal to that of the second welding layer, and the thickness difference between the first welding layer and the second welding layer is smaller than or equal to that of the interconnection strip.

Under the condition of adopting above-mentioned technical scheme, the thickness of the first welding layer and the second welding layer of the general busbar among the prior art is the same. Under this condition, work as the utility model discloses well thickness of second welding layer and the thickness of base member all are the same with the thickness of second welding layer and the thickness of base member among the prior art, if the thickness of first welding layer is greater than the thickness of second welding layer, the thickness that represents the busbar this moment is compared and is increased in prior art. Therefore, to the busbar of the same width, the utility model provides a cross sectional area of busbar is bigger. Based on this, the utility model provides an electrical loss of busbar is less than the electrical loss of the busbar among the prior art, and then has improved photovoltaic module's efficiency.

And, since the difference in thickness between the first and second solder layers is less than or equal to the thickness of the interconnection bar. When the bus bar and the interconnection bar are welded by using the welding device provided by the first aspect, if the thickness difference between the first welding layer and the second welding layer is equal to the thickness of the interconnection bar, the melted first welding layer can substantially wrap or completely wrap the interconnection bar overlapped on the first welding layer by controlling the pressure applied to the bus bar and the interconnection bar by the welding part. On this basis, not only can ensure the good contact of interconnect strip and busbar, reduce the risk of rosin joint. Meanwhile, the thickness of the welded bearing area can be further prevented from being greatly increased, and the use amount of the packaging adhesive film on the welding surface of the bus bar is further reduced. Furthermore, in this case, when comparing in the prior art when not increasing the busbar thickness, the utility model discloses in increase the busbar thickness after the welded gross thickness be substantially equal to or equal to the busbar of not increasing thickness among the prior art and the total thickness after the interconnection bar welding. Based on this, the utility model discloses with the volume of the encapsulation glued membrane that uses when not increasing busbar thickness among the prior art unanimous basically or unanimous, and then compare the cost of manufacture that has reduced photovoltaic module when increasing busbar thickness among the prior art. Further, the specifications of the bus bars can be set according to actual conditions, and the selectivity of the bus bars is increased. Based on this, can further make photovoltaic module adapt to different application scenarios, enlarge its application scope.

In one implementation, the thickness of the first welding layer is 0.025mm to 0.375mm, and the thickness of the substrate is 0.25mm to 0.6mm.

In one implementation, a plane that coincides with a length direction of the bus bar and is perpendicular to a thickness direction of the bus bar is defined as a longitudinal section. The shape of the longitudinal section of the first welding layer is a closed figure formed by a rectangle, an arc and a line segment, and the shape of the longitudinal section of the base body is a closed figure formed by a rectangle, an arc and a line segment.

Under the condition of adopting the technical scheme, the shapes of the first welding layer and the base body can be set according to the actual situation, so that the selectivity is increased. Based on this, can further make busbar and photovoltaic module adapt to different application scenarios, enlarge its application scope.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is a schematic view of a part of a welding device in an embodiment of the present invention;

fig. 2 is a schematic view of a first structure of a first carrier and a welding assembly according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second bearing member according to an embodiment of the present invention;

fig. 4 is a first cross-sectional view of a first configuration of a bus bar in an embodiment of the invention;

fig. 5 is a schematic view of a second structure of the first carrier and the welding assembly according to the embodiment of the present invention;

FIG. 6 is a second cross-sectional view of a first configuration of a bus bar according to an embodiment of the present invention;

fig. 7 is a cross-sectional view of a second structure of a bus bar according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a prior art bus bar;

fig. 9 is a cross-sectional view of an interconnection strip in an embodiment of the invention.

Reference numerals:

1-interconnection bar, 10-copper conductor, 11-welding layer;

2-bus bar, 20-connection zone, 21-carrying zone,

22-bonding side, 23-non-bonding side, 24-base body,

25-solder layer, 250-first solder layer, 251-second solder layer;

3-welding device, 30-first carrier, 31-welding assembly,

310-end face, 311-connector, 312-weldment,

313-air outlet, 32-second bearing piece, 320-through groove,

3200-bearing surface, 4-battery piece.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1, a photovoltaic module is a device for implementing photoelectric conversion, and generally includes a battery sheet 4, an interconnection bar 1, a bus bar 2, an encapsulation adhesive film, a light-transmissive cover plate, a back plate, a frame, a junction box, and the like. Wherein, a plurality of battery pieces 4 are connected in series by the interconnecting strips 1 to form a battery string. The connection of the plurality of battery strings is realized with the bus bar 2 to draw out the current of the plurality of battery strings.

In the photovoltaic module in the prior art, a bus bar having a rectangular cross section and a flat shape is often used. To reduce the electrical loss of the bus bar, the cross-sectional area of the bus bar is generally increased. For a photovoltaic module designed by a given model, the width of the bus bar used in the photovoltaic module is determined, so that only the thickness of the bus bar can be increased.

At this time, when the interconnection bar is directly welded to the welding surface of the bus bar using the welding apparatus in the related art, the total thickness after welding may increase. Therefore, when the bus bar is packaged by the packaging adhesive film in the later period, more packaging adhesive films are needed for the welding surface of the bus bar welded with the interconnection bar. If the using amount of a packaging adhesive film of a welding surface is not increased, bubbles and explosion phenomena easily occur near the bus bar welded with the interconnection bar after lamination at the later stage, and the photovoltaic module is further damaged.

In order to solve the technical problem, the embodiment of the utility model provides a welding set for welding interconnection bar and busbar.

Referring to fig. 1 to 3, the welding device 3 may include: a first carrier 30, a plurality of welding assemblies 31 and a second carrier 32. Along the length direction of the first carrier 30, a plurality of welding assemblies 31 are disposed at intervals on the first carrier 30. Along the length direction of the second carrier 32, a plurality of through slots 320 corresponding to the welding assemblies 31 one by one are arranged on the second carrier 32 at intervals, and the axes of the through slots 320 are consistent with the width direction of the second carrier 32. The through groove 320 has a bearing surface 3200 for bearing the interconnection bar 1 and the bus bar 2.

The first bearing piece can be a bearing block or other devices, and the second bearing piece can be a cushion table or other devices. The remaining specific structures of the first bearing member and the second bearing member are not particularly limited, as long as the actual requirements can be met.

Referring to fig. 1 to 4, in the welding device 3 according to the embodiment of the present invention, since the second supporting member 32 is provided with a plurality of through grooves 320 corresponding to the welding assemblies 31 in a one-to-one manner at intervals along the length direction of the second supporting member 32. Therefore, when the welding set 31 applies downward pressure to the interconnection bar 1 and the bus bar 2 corresponding to the interconnection bar 1 after the interconnection bar 1 to be welded is correspondingly placed on the bus bar 2 located above the through groove 320, the bus bar 2 corresponding to the interconnection bar 1 moves in the depth direction of the through groove 320. At this time, the bus bar 2 corresponding to the interconnection bar 1 is protruded in a direction closer to the through groove 320 than the bus bar 2 of the other region. Based on this, compare the condition that increases bus bar 2 thickness among the prior art, to the face of weld 22 of bus bar 2, the embodiment of the utility model provides an area after bus bar 2 and interconnection bar 1 weld and the regional difference in height for same horizontal plane that has not welded interconnection bar 1 in bus bar 2 reduce. Therefore, the amount of the sealant film used on the bonding surface 22 of the bus bar 2 is reduced compared to the case of increasing the thickness of the bus bar 2 in the prior art. In addition, since the welding assemblies 31 correspond to the through slots 320 one to one. Therefore, when welding the interconnection bar 1 and the bus bar 2, only the region to be welded needs to be heated, and it is possible to prevent the welding material of the welding face 22 of the bus bar 2 from being melted over a large area, saving the time for welding and the energy consumed for welding.

The shape of the bearing surface of the through slot is various, and two possible implementations are described below as examples, it being understood that the following description is only for understanding and is not intended to be limiting.

Example one: referring to fig. 1 and 2, the through groove 320 has a bearing surface 3200 and an end surface of the welded assembly 31, which are both curved surfaces.

Example two: referring to fig. 5, the through groove has a bearing surface and the end surface 310 of the welded assembly 31 is flat.

With the above technical solution, referring to fig. 1, 2 and 5, the shape of the bearing surface 3200 of the through groove 320 may be set according to actual conditions, so as to increase the selectivity of the second bearing member 32. Similarly, the shape of the end surface 310 of the welded assembly 31 can be set according to actual conditions, so that the selectivity of the welded assembly 31 is increased. Based on this, make welding set 3 can adapt to different application scenarios, enlarged its application scope.

As a possible realization, see fig. 1 and 3, the depth of the through-groove 320 is greater than 0mm and less than or equal to the thickness of the interconnection strip 1.

Referring to fig. 1 and fig. 3, at this time, it is avoided that the welding group moves to a direction close to the through groove 320 to a distance that is too large, so as to avoid that the bus bar 2 portion corresponding to the interconnection bar 1 is more protruded than the bus bar 2 in other regions, and further avoid the embodiment of the present invention, the non-welding surface 23 of the bus bar 2 becomes the welding surface 22 in the prior art, and the amount of the packaging adhesive film used by the non-welding surface 23 of the bus bar 2 is increased while the amount of the packaging adhesive film used by the welding surface 22 of the bus bar 2 is reduced. It should be understood that although the non-welding surface 23 of the bus bar 2 protrudes compared to the prior art, because the non-welding surface 23 of the bus bar 2 is located at a position having a margin space in the actual process of manufacturing the photovoltaic module in the prior art, and because the depth of the through groove is greater than 0mm and less than or equal to the thickness of the interconnection bar, at this time, it may be defined that the protruding amount of the non-welding surface 23 of the bus bar 2 in the embodiment of the present invention is less than or equal to the accommodating amount of the margin space. Therefore, utilize the embodiment of the utility model provides a welding set 3 can not influence the non-welding face 23 of busbar 2 after welding interconnection bar 1 and busbar 2, and then can not increase the encapsulation glued membrane use amount of non-welding face 23 of busbar 2. Based on this, the embodiment of the utility model provides a compare with the condition that increases 2 thicknesses of busbar among the prior art, reduced the use total amount of encapsulation glued membrane, and then compared the condition that increases 2 thicknesses of busbar in prior art and reduced photovoltaic module's cost of manufacture. Furthermore, the welding surface of the bus bar and the amount of the non-welding surface packaging adhesive film meet the manufacturing requirements of the photovoltaic module, so that the safety of the photovoltaic module can be ensured, and the phenomena of bubbles and explosion can be reduced or avoided.

As a possible implementation manner, the depth of the through groove is greater than 0mm and less than or equal to 0.5mm. For example, the depth may be 0.1mm, 0.2mm, 0.35mm, 0.4mm, 0.5mm, or the like. The depth of the through groove can be set according to actual conditions, and the depth selectivity of the through groove is increased. Based on this, can further make welding set adapt to different application scenarios, enlarge its application scope.

As a possible implementation manner, referring to fig. 1 to 3, the through groove 320 has a length of the bearing surface 3200 and a length of the end surface 310 of the welding assembly 31, which are both greater than or equal to the width H of the bus bar 2. The longitudinal direction of the bearing surface 3200, the longitudinal direction of the end surface 310 of the welded component 31, and the width direction of the bus bar 2, which are provided in the through groove 320, are parallel to the longitudinal direction of the interconnection bar 1.

With the above technical solution, referring to fig. 1 to 3, since the length of the bearing surface 3200 of the through groove 320 is greater than or equal to the width H of the bus bar 2, at this time, the bearing forces of the bus bar 2 above the through groove 320 are the same from the through groove 320, that is, the forces of the bus bar 2 in the region are balanced, so that the probability of damage to the bus bar 2 can be reduced. Since the length of the end surface 310 of the welded assembly 31 is greater than or equal to the width of the bus bar 2, the bus bar 2 under the welded assembly 31 is subjected to a pressing force. Accordingly, the bus bars 2 corresponding to the interconnection bars 1 are equally stressed and equally deformed by the welding member 31. It should be understood that the thickness of the packaging adhesive film covering each position of the bonding surface 22 is substantially uniform or consistent due to the fluidity of the packaging adhesive film at the previous stage. Based on this, when the length of the end face 310 of the soldering assembly 31 is greater than or equal to the width of the bus bar 2, it can be ensured that the amount of the potting adhesive film used at the soldering face 22 of the bus bar 2 after the interconnection bar 1 and the bus bar 2 are connected is reduced compared to the case where the thickness of the bus bar 2 is increased in the related art.

As a possible implementation, referring to fig. 1 and 5, the welding assembly 31 may include: a connection piece 311 and a weld piece 312. The connecting member 311 is disposed on the first supporting member 30, and the welding member 312 and the connecting member 311 are telescopically connected along the height direction of the first supporting member 30.

With the above technical solution, referring to fig. 1 and 5, the welding assembly 31 only includes two parts, namely the connecting member 311 and the welding member 312, so that the welding assembly 31 has a simple structure and is easy to manufacture. Also, since the welding member 312 is telescopically coupled to the coupling member 311, when the welding member 312 heats the interconnection bar 1 and the bus bar 2, the welding member 312 can be spaced apart from the bus bar 2 and the interconnection bar 1 to prevent welding material dross generated during the heating process from adhering to the welding member 312. Based on this, not only can ensure the normal work of welding piece 312, can also reduce or eliminate the probability of later stage clearance welding piece 312 simultaneously to save the clearance time, improve work efficiency.

For example, the welding part can be controlled by a motor to move up and down relative to the connecting part, so that the welding part can reach a specified position accurately or precisely.

In an alternative way, referring to fig. 2 and 5, the welding member 312 is provided with an air outlet 313, and the air outlet 313 is used for assisting in welding the interconnection bar and the bus bar.

Referring to fig. 1, 2 and 5, when hot wind is discharged from the wind discharge holes 313, it may be used to melt the welding material of the interconnection bar 1 and the welding material of the bus bar 2. When the air outlet 313 discharges cold air or stops discharging air, the welding materials of the interconnection bar 1 and the bus bar 2 can be fused together, so that the interconnection bar 1 and the bus bar 2 can be welded.

In an alternative form, see fig. 2 and 5, the air outlet 313 is located in the centre of the end face 310 of the weldment 312. At this time, the bus bars and the interconnection bars at the positions to be welded can be uniformly heated.

Illustratively, referring to fig. 1, 2 and 5, the weldment 312 is moved up 2mm relative to the connection piece 311 before heating the interconnection bar 1 and the bus bar 2. Next, the position to be connected is blown by the air outlet 313, and the time for blowing the air may be 1 second. The temperature of the hot air discharged from the air outlet 313 is required to be higher than the melting point of the welding material of the interconnection bar 1 and the bus bar 2. For example, when the soldering materials of the interconnection bar 1 and the bus bar 2 are both a tin-lead alloy, the temperature of the hot air is higher than the melting point of the tin-lead alloy (i.e., 183 ℃).

In an alternative, the welding members may be made of a material having a high hardness, such as steel, which facilitates the extrusion of the bus bars and the interconnecting bars.

In a second aspect, an embodiment of the present invention further provides a photovoltaic module, including the interconnection bar and the bus bar welded by the welding device according to the above technical solution. Referring to fig. 1, the bus bar 2 includes a plurality of connection regions 20 and carrying regions 21 alternately distributed along a length direction of the bus bar 2. The interconnection bar 1 is disposed in the carrying region 21, and the carrying region 21 protrudes from the connecting region 20 along a direction away from the interconnection bar 1.

Referring to fig. 1 and 4, the carrier areas 21 protrude from the connection areas 20 in a direction away from the interconnection strips 1. For convenience of description, the surface of the bus bar 2 is hereinafter divided into the soldering surface 22 and the non-soldering surface 23, and the connection region 20 and the carrying region 21 may both include the soldering surface 22 and the non-soldering surface 23 according to actual situations. Compare the condition that increases 2 thicknesses of busbar among the prior art, to the face of weld 22 of busbar 2, the embodiment of the utility model provides an it reduces for the difference in height of same horizontal plane not welded in the regional 21 of bearing after 2 and the welding of interconnection bar 1 of busbar and the busbar 2. Therefore, the amount of the sealant film used on the bonding surface 22 of the bus bar 2 is reduced compared to the case of increasing the thickness of the bus bar 2 in the prior art.

As a possible implementation manner, the bearing area has a bearing surface, the interconnection strips are disposed on the bearing surface, and the bearing surface is a plane or a curved surface. The shape of the bearing surface can be set according to actual conditions, so that the selectivity of the bus bar is increased, the photovoltaic module can adapt to different application scenes, and the application range of the photovoltaic module is expanded.

As a possible realization, the height of the bearing area 21 protruding from the connecting area 20 is greater than 0mm and less than the thickness of the interconnection strip 1, see fig. 1.

Referring to fig. 1 and fig. 4, at this time, it can be avoided that the bus bar 2 portion corresponding to the interconnection bar 1 (i.e. the bus bar 2 located in the bearing region 21) protrudes too much compared with the bus bar 2 located in the connection region 20, thereby avoiding the non-welding surface 23 of the bus bar 2 becoming the welding surface 22 in the prior art, and avoiding the amount of the packaging adhesive film used by the non-welding surface 23 of the bus bar 2 being increased while the amount of the packaging adhesive film used by the welding surface 22 of the bus bar 2 is reduced. It should be understood that, although the non-welding surface 23 of the bus bar 2 is protruded compared with the prior art, because the prior art actually manufactures the photovoltaic module, the position of the non-welding surface 23 of the bus bar 2 has a margin space, and because the depth of the through groove is greater than 0mm and less than or equal to the thickness of the interconnection bar, at this time, it can be limited that the protrusion amount of the non-welding surface 23 of the bus bar 2 is less than or equal to the accommodation amount of the margin space. Therefore, utilize the embodiment of the utility model provides a welding set 3 can not influence the non-welding face 23 of busbar 2 after welding interconnection bar 1 and busbar 2, and then can not increase the encapsulation glued membrane use amount of non-welding face 23 of busbar 2. Based on this, the embodiment of the utility model provides a compare with the condition that increases 2 thicknesses of busbar among the prior art, reduced the use total amount of encapsulation glued membrane, and then compared the condition that increases 2 thicknesses of busbar in prior art and reduced photovoltaic module's cost of manufacture. Furthermore, the welding surface of the bus bar and the amount of the non-welding surface packaging adhesive film meet the manufacturing requirements of the photovoltaic module, so that the safety of the photovoltaic module can be ensured, and the phenomena of bubbles and explosion can be reduced or avoided.

As a possible implementation, referring to fig. 6 and 7, the bus bar may include: the welding device comprises a base body 24 and a welding layer 25 coated on the outer surface of the base body 24, wherein the outer surface of the base body 24 comprises a welding surface and a non-welding surface. The solder layer 25 may include: a first solder layer 250 and a second solder layer 251. The first welding layer 250 is disposed on the welding surface for connecting with the interconnection bar. The second solder layer 251 is disposed on the non-solder surface. Of the first and second welding layers 250 and 251 oppositely disposed in the thickness direction of the base 24, the first welding layer 250 has a thickness greater than or equal to that of the second welding layer 251, and the difference in thickness between the first and second welding layers 250 and 251 is less than or equal to that of the interconnection bar.

Referring to fig. 4, 6 and 7, illustratively, when the substrate 24 is a rectangular parallelepiped substrate, the rectangular parallelepiped substrate includes upper and lower top surfaces, and side surfaces. The side surface is divided into a first side surface and a second side surface along the length direction of the cuboid matrix. At this time, the upper top surface, the lower bottom surface, and the second side surface are non-welding surfaces, and the first side surface is a welding surface. The first bonding layer 250 is disposed on the first side surface, and the second bonding layer 251 is disposed on the top, bottom, and side surfaces. In the first and second welding layers 250 and 251 oppositely disposed in the thickness direction of the base 24 (i.e., in the first welding layer 250 disposed on the first side and the second welding layer 251 disposed on the second side), the thickness of the first welding layer 250 is greater than or equal to that of the second welding layer 251, and the difference in thickness between the first and second welding layers 250 and 251 is less than or equal to that of the interconnection bar 1.

Referring to fig. 6 and 8, the first and second welding layers 250 and 251 of the general bus bar in the related art have the same thickness (see fig. 8). In this case, when the thickness of the second welding layer 251 and the thickness of the base 24 are the same as those of the second welding layer 251 and the base 24 in the prior art in the embodiment of the present invention, if the thickness of the first welding layer 250 is greater than that of the second welding layer 251, it indicates that the thickness of the bus bar is increased compared to the prior art. Therefore, to the busbar of the same width, the utility model provides a busbar's cross sectional area is bigger. Based on this, the embodiment of the utility model provides an electric loss of busbar is less than the electric loss of the busbar among the prior art, and then has improved photovoltaic module's efficiency. And, since the difference in thickness of the first and second welding layers 250 and 251 is less than or equal to the thickness of the interconnection bar. When the bus bar and the interconnection bar are welded by using the welding apparatus provided in the first aspect, if the difference between the thicknesses of the first welding layer 250 and the second welding layer 251 is equal to the thickness of the interconnection bar, the melted first welding layer 250 can substantially wrap or completely wrap the interconnection bar overlapping the first welding layer 250 by controlling the amount of pressure applied to the bus bar and the interconnection bar by the welding member. On this basis, not only can ensure the good contact of interconnect strip and busbar, reduce the risk of rosin joint. Meanwhile, the thickness of the welded bearing area can be further prevented from being greatly increased, and the use amount of the packaging adhesive film on the welding surface of the bus bar is further reduced. In addition, in this case, compare when not increasing the busbar thickness in the prior art, the total thickness of welding after increasing the busbar thickness in the embodiment of the present invention is substantially equal to or equal to the total thickness of welding after the busbar and the interconnection bar of not increasing the thickness in the prior art. Based on this, the embodiment of the utility model provides an encapsulation glued membrane's that uses when not increasing busbar thickness volume is unanimous basically or unanimous among the prior art, and then has reduced photovoltaic module's cost of manufacture when comparing in prior art when increasing busbar thickness. Further, the specification of the bus bar can be set according to actual conditions, and the selectivity of the bus bar is increased. Based on this, can further make photovoltaic module adapt to different application scenarios, enlarge its application scope.

In an alternative, the substrate may be made of copper, and the solder layer may be made of tin-lead alloy. Referring to fig. 9, the interconnection bar 1 is composed of a copper conductor 10 and a solder layer 11 made of tin-lead alloy and covering the outer surface of the copper conductor 10.

By way of example, the following describes, by way of example, one possible implementation of how to provide a welding device for welding bus bars and interconnection bars using the first aspect, with the understanding that the following description is given for understanding only and is not intended to be limiting in detail.

Referring to fig. 1 to 8, before welding, the interconnection bar 1 is positioned on the first welding layer 250 of the bus bar 2. Since the welding device 3 will press the bus bar 2 and the interconnection bar 1 downwards, and since the welding part 312 is made of steel. As is known from the prior art, steel has a hardness greater than copper, which has a hardness greater than tin-lead alloys. By controlling the pressing force of the welding member 312 downward, only the first welding layer 250 of the bus bar 2 is pressed and deformed, and the pressed portion forms a "depression". The above-mentioned interconnection bar 1 is located in the recess, i.e., the interconnection bar 1 is located in the first solder layer 250. In this process, interference fit between the interconnection bar 1 of the metal material and the bus bar 2 of the metal material can ensure that the interconnection bar 1 and the bus bar 2 are in close contact in the later stage at this time. After the pressing is completed, the welding member 312 moves upward by 2mm relative to the connection member 311. Next, the position to be connected is blown by the air outlet 313, and the time for blowing the air may be 1 second. The temperature of the hot air discharged from the air outlet 313 is higher than the melting point of the tin-lead alloy (namely 183 ℃). At this time, the extruded sn — pb alloy in the first solder layer 250 melts and flows to both sides of the interconnection bar 1. And then stopping blowing air to allow the molten tin-lead alloy to be cooled and solidified at normal temperature. In this process, the melted first welding layer 250 may substantially wrap or completely wrap the interconnection strip 1 overlapping the first welding layer 250. On this basis, not only can good contact of the interconnection bar 1 and the bus bar 2 be ensured, the risk of cold joint is reduced. Meanwhile, because the molten tin-lead alloy has fluidity, the extruded tin-lead alloy can flow to two sides, so that the overall height after extrusion welding cannot exceed the sum of the respective heights of the bus bar 2 and the interconnection bar 1, and further the thickness of the bearing area 21 after welding can be further prevented from being greatly increased, so that the use amount of the packaging adhesive film of the welding surface 22 of the bus bar 2 is further prevented from being increased. In the welding process, the end surface 310 of the welding member 312 and the bearing surface 3200 included in the through groove 320 in the welding device 3 may be flat surfaces. At this time, the bearing surface 3200 may provide a uniform supporting force to the bus bar 2. Of course, the end surface 310 of the welding member 312 and the receiving surface 3200 included in the through groove 320 in the welding apparatus 3 used may be curved surfaces.

As a possible implementation, the thickness of the first welding layer may be 0.025mm to 0.375mm, for example, 0.025mm, 0.075mm, 0.125mm, 0.235mm, or 0.375mm, etc. The thickness of the substrate may be 0.25mm to 0.6mm, for example, 0.25mm, 0.3mm, 0.45mm, 0.5mm, 0.55mm, or 0.6mm, and the like.

As one possible implementation, referring to fig. 6 and 7, a plane that coincides with the length direction of the bus bar and is perpendicular to the thickness direction of the bus bar is defined as a longitudinal section. The shape of the longitudinal section of the first welding layer 250 is a closed figure formed by a rectangle, an arc and a line segment, and the shape of the longitudinal section of the base body 24 is a closed figure formed by a rectangle, an arc and a line segment. The shapes of the first welding layer 250 and the base body 24 can be set according to actual conditions, and selectivity is increased. Based on this, can further make busbar and photovoltaic module adapt to different application scenarios, enlarge its application scope.

While the foregoing description has been made with reference to the case where the substrate is a rectangular parallelepiped substrate and the cylindrical interconnection bar welded to the bus bar has a diameter of 0.35mm, it is to be understood that the following description is only for understanding and is not intended to be limiting.

Referring to fig. 8, the bus bar of the related art has a width of 4mm and a total thickness of 0.3mm. Specifically, the thickness of the first solder layer 250 disposed on the first side and the thickness of the second solder layer 251 disposed on the second side are both 0.025mm, and the resistivity thereof is 1.66E-02 Ω/m.

Referring to fig. 6, as a first example, the first welding layer 250 disposed on the first side, the second welding layer 251 disposed on the second side, and the copper base have rectangular longitudinal sectional shapes. At this time, the bus bar has a width of 4mm and a total thickness of 0.65mm. Specifically, the thickness D1 of the first welding layer 250 is 0.375mm (the thickness is increased by an amount equal to the diameter of the interconnection bar compared to the first welding layer 250 in the related art), the thickness D2 of the second welding layer 251 is 0.025mm, the resistivity thereof is 1.53E-02 Ω/m, and the resistance of the bus bar is reduced by about 10% compared to the related art.

Referring to fig. 7, in a second example, the first welding layer 250 and the copper base disposed on the first side have a closed shape formed by an arc and a line, and the second welding layer 251 disposed on the second side has a rectangular shape. At this time, the bus bar has a width of 4mm and a total thickness of 0.65mm. Specifically, the average thickness (or equivalent thickness) of the first solder layer 250 is 0.1875mm, the thickness D2 of the second solder layer 251 is 0.025mm, the resistivity thereof is 9.45E to 3 Ω/m, and the resistance of the bus bar is reduced by about 45% compared to the prior art.

In a second example, the copper matrix is thickened. Since the resistance of copper is smaller than that of tin-lead alloy, the bus bar in the second example can obtain a better electrical loss effect than the bus bar in the first example. It should be understood that the second weld layer may also be thickened to achieve thickening of the bus bar.

In an alternative manner, the ratio relationship between the base body and each welding layer in the bus bar in the embodiment of the present invention is consistent with the prior art, but the thickness of the bus bar is greater than that of the bus bar in the prior art. At this time, when the bus bar with the increased thickness is welded by the welding device provided by the first aspect, the usage amount of the packaging adhesive film on the welding surface of the bus bar is not increased.

For example, the bus bar and the interconnection bar of the portion to be welded are pressed downward by the welding member, and the specific distance of pressing downward may be adjusted according to the amount of the encapsulant film used for the welding surface and the non-welding surface of the bus bar as long as the thickness of the interconnection bar is not exceeded. After the extrusion is completed, the welding part moves upwards relative to the connecting piece, and the air outlet is used for blowing air to the position to be connected so as to weld the bus bar and the interconnection bar.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (13)

1. A welding device for welding an interconnection bar and a bus bar; the welding device includes:

a first bearing member;

the welding assemblies are arranged on the first bearing piece at intervals along the length direction of the first bearing piece;

the second bearing piece is provided with a plurality of through grooves which correspond to the welding assemblies one by one at intervals along the length direction of the second bearing piece, and the axes of the through grooves are consistent with the width direction of the second bearing piece; the through groove has a bearing surface for bearing the interconnection bar and the bus bar.

2. The welding device of claim 1, wherein the through slot has a bearing surface that is planar with an end surface of the weld stack; and/or the presence of a gas in the gas,

the bearing surface of the through groove and the end surface of the welding assembly are both curved surfaces.

3. Welding device according to claim 1, wherein the depth of the through slot is greater than 0mm and less than or equal to the thickness of the interconnection strip.

4. Welding device according to claim 1 or 3, wherein the depth of the through slot is greater than 0mm and less than or equal to 0.5mm.

5. The welding device according to claim 1, wherein the through slot has a length of a bearing surface and a length of an end surface of the welding member each greater than or equal to a width of the bus bar; the length direction of the bearing surface of the through groove, the length direction of the end surface of the welding assembly and the width direction of the bus bar are parallel to the length direction of the interconnection bar.

6. The welding device of claim 1, wherein the welding assembly comprises:

the connecting piece is arranged on the first bearing piece;

the welding piece is in telescopic connection with the connecting piece along the height direction of the first bearing piece.

7. The welding device of claim 6, wherein the weldment has air vents formed therein for assisting in welding the interconnection bars and the bus bars.

8. A photovoltaic module comprising an interconnection bar and a bus bar soldered by the soldering apparatus of any one of claims 1 to 7;

the bus bar comprises a plurality of connecting areas and bearing areas which are alternately distributed along the length direction of the bus bar; the interconnection strips are arranged in the bearing area;

the bearing region protrudes from the connecting region along a direction away from the interconnection strip.

9. The assembly according to claim 8, wherein the supporting region has a supporting surface, the interconnection strips are disposed on the supporting surface, and the supporting surface is a plane or a curved surface.

10. The assembly according to claim 8, wherein the height of the carrier region protruding from the connecting region is greater than 0mm and less than the thickness of the interconnection strip.

11. The photovoltaic module of claim 8, wherein the bus bar comprises: the welding layer is coated on the outer surface of the base body; the outer surface of the base body comprises a welding surface and a non-welding surface;

the welding layer includes:

the first welding layer is arranged on the welding surface and is used for being connected with the interconnection strips;

the second welding layer is arranged on the non-welding surface;

the thickness of the first welding layer is larger than or equal to the thickness of the second welding layer, and the thickness difference of the first welding layer and the second welding layer is smaller than or equal to the thickness of the interconnection strip.

12. The photovoltaic module of claim 11 wherein the first solder layer has a thickness of 0.025mm to 0.375mm; the thickness of the substrate is 0.25mm to 0.6mm.

13. The photovoltaic module according to claim 11, wherein a plane that coincides with a length direction of the bus bar and is perpendicular to a thickness direction of the bus bar is defined as a longitudinal section;

the shape of the longitudinal section of the first welding layer is a closed graph formed by a rectangle, an arc and a line segment; the longitudinal section of the base body is in a closed figure formed by a rectangle, an arc and a line segment.

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