CN220254459U

CN220254459U - Photovoltaic module

Info

Publication number: CN220254459U
Application number: CN202321509227.XU
Authority: CN
Inventors: 王飞; 刘征东; 侯运来
Original assignee: Longi Green Energy Technology Co Ltd
Current assignee: Longi Green Energy Technology Co Ltd
Priority date: 2023-06-13
Filing date: 2023-06-13
Publication date: 2023-12-26
Anticipated expiration: 2033-06-13

Abstract

The embodiment of the utility model provides a photovoltaic module, which comprises a junction box and a bus bar, wherein the junction box comprises a bonding pad and a diode; wherein the bonding pad and the diode are arranged side by side along a first direction; the bus bar and the bonding pad are welded together through laser, a plurality of welding seams are formed through laser welding, and the welding seams extend into the bonding pad through the bus bar; the edge of the welding seam closest to the diode along the first direction is a first edge, and the edge of the diode closest to the welding seam along the first direction is a second edge; the first edge and the second edge are provided with a safety distance therebetween, the safety distance is a straight line distance between the first edge and the second edge in the first direction, and the safety distance is greater than or equal to 3mm. In the process of welding connection between the welding part and the bus bar, the diode short circuit caused by welding can be avoided, and the welding manufacturing yield is improved.

Description

Photovoltaic module

Technical Field

The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic module.

Background

In the related art, the welding process of the junction box mainly uses resistance welding or electromagnetic welding, the welding rosin joint and outdoor desoldering proportion are higher, the omission ratio is also very high when the assembly is delivered, and huge losses are caused to manufacturing enterprises and clients, so the rosin joint of the junction box is a problem to be solved by each manufacturing enterprise.

At present, a resistance welding or electromagnetic welding mode is adopted, and the bus bar is welded on the copper bonding pad of the junction box by melting a tin block on the copper bonding pad of the junction box and a tin layer on the surface of the bus bar, however, liquid tin flows out along the edge of the bonding pad after welding and melting, so that a diode in the junction box is short-circuited easily, and the welding manufacturing yield is affected.

Disclosure of Invention

In view of the foregoing, embodiments of the present utility model have been developed to provide a photovoltaic module that overcomes, or at least partially solves, the foregoing problems.

In order to solve the problems, the embodiment of the utility model discloses a photovoltaic module, which comprises a junction box and a bus bar, wherein the junction box comprises a bonding pad and a diode; wherein,

the bonding pad and the diode are arranged side by side along a first direction;

the bus bar and the bonding pad are welded together through laser, a plurality of welding seams are formed through the laser welding, and the welding seams extend into the bonding pad through the bus bar;

the edge of the welding seam closest to the diode along the first direction is a first edge, and the edge of the diode closest to the welding seam along the first direction is a second edge;

the first edge and the second edge are provided with a safety distance therebetween, the safety distance is a straight line distance between the first edge and the second edge in the first direction, and the safety distance is greater than or equal to 3mm.

Optionally, the pad and/or the bus bar are sheet-like structures and have a flat soldering surface.

Optionally, a plurality of the welding seams form a welding pattern, and the minimum distance between the edge of the welding pattern and the edge of the welding pad is greater than or equal to 1.5mm.

Optionally, the junction box further includes a box body including a box wall surrounding the bonding pad, and the minimum distance between the bonding pattern and the box wall is greater than or equal to 2.5mm.

Optionally, a positioning hole is formed in one end, far away from the diode, of the bonding pad, a positioning column is arranged at the bottom of the box body, and the positioning column penetrates through the positioning hole.

Optionally, a minimum distance between the welding pattern and the positioning post is greater than or equal to 1mm.

Optionally, a limiting protrusion is arranged at a position of the bonding pad opposite to the diode;

the bonding pad is connected with the pin of the diode in a welding way;

the limiting protrusion extends along the first direction, the pin is arranged between the limiting protrusion and the bottom of the box body, and the limiting protrusion is used for limiting the pin so as to ensure that the pin is spread along the first direction.

Optionally, the number of pads includes two;

the two bonding pads are symmetrically arranged on two sides of the diode along the first direction;

and the two bonding pads are respectively connected with the two pins of the diode in a welding way.

Optionally, the number of welds is greater than or equal to four.

Optionally, the length of each welding seam is greater than or equal to 3mm, and the distance between two adjacent welding seams is greater than or equal to 0.7mm.

Optionally, the width of the bus bar is greater than or equal to 5mm, and the thickness of the bus bar is greater than or equal to 0.2mm.

The embodiment of the utility model has the following advantages:

in the embodiment of the utility model, the bonding pad and the diode are arranged side by side along the first direction, a plurality of welding seams are formed between the bonding pad and the bus bar through laser welding, the edge of the welding seam closest to the diode along the first direction is a first edge, and the edge of the diode closest to the welding seam along the first direction is a second edge, and because a safety distance is arranged between the first edge and the second edge, the safety distance is more than or equal to 3mm, the sufficient gap between the welding seam and the diode can be effectively ensured, so that the diode short circuit caused by welding in the welding connection process of the bonding pad and the bus bar can be avoided, and the welding manufacturing yield is improved.

Drawings

Fig. 1 is a schematic structural view of a photovoltaic module according to an embodiment of the present utility model;

FIG. 2 is a schematic view of another photovoltaic module according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a diode according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a structure of a photovoltaic module according to another embodiment of the present utility model;

FIG. 5A is a schematic diagram of a pad structure in an embodiment of the utility model;

fig. 5B is a schematic structural diagram of another pad in an embodiment of the present utility model.

Reference numerals illustrate:

1-bonding pad, 11-locating hole, 13-spacing protruding, 2-diode, 21-pin, 3-lead-out wire, 4-welding seam, 5-busbar.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

One of the core ideas of the embodiments of the present utility model is to disclose a photovoltaic module comprising a junction box and a bus bar 5, wherein the junction box may specifically comprise a bonding pad 1 and a diode 2; wherein the bonding pad 1 and the diode 2 may be arranged side by side along the first direction; the bus bar 5 and the bonding pad 1 can be welded together by laser, and the laser welding can form a plurality of welding seams 4, and the plurality of welding seams 4 can extend into the bonding pad 1 through the bus bar 5; the edge of the weld seam 4 closest to the diode 2 along the first direction is a first edge, and the edge of the diode 2 closest to the weld seam 4 along the first direction is a second edge; the first edge and the second edge are provided with a safety distance, the safety distance is a straight line distance between the first edge and the second edge in the first direction, and the safety distance is greater than or equal to 3mm.

In the embodiment of the utility model, the bonding pad 1 and the diode 2 are arranged side by side along the first direction, a plurality of welding seams 4 are formed between the bonding pad 1 and the bus bar 5 by laser welding, the edge of the welding seam 4 closest to the diode 2 along the first direction is a first edge, the edge of the diode 2 closest to the welding seam 4 along the first direction is a second edge, and because a safety distance is arranged between the first edge and the second edge, the safety distance is greater than or equal to 3mm, and enough gaps are effectively ensured between the welding seam 4 and the diode 2, so that the diode 2 is prevented from being shorted due to welding in the welding connection process of the bonding pad 1 and the bus bar 5, and the welding manufacturing yield is improved.

In the embodiment of the utility model, the bus bar 5 comprises a copper bottom plate, the bonding pad 1 of the junction box can be a copper bonding pad 1, and as the bonding pad 1 and the copper bottom plate of the bus bar 5 are made of the same material, a laser welding process can be adopted to melt and recast a welding part and the copper plate of the bus bar 5, and the copper bottom plate of the bus bar 5 and the bonding pad 1 of the junction box can be melt and recast into an integral structure, so that a plurality of welding seams 4 can be formed between the bus bar 5 and the bonding pad 1, the welding firmness between the bus bar 5 and the bonding pad 1 is higher, and the desoldering proportion is lower.

Further, when the bonding pad 1 and the bus bar 5 are welded by laser, a tin block is not needed, the eutectic melting of tin and copper can be avoided, the influence of impurities is reduced, the risk of faults or cracks is reduced, and long-term stability between the bonding pad 1 and the bus bar 5 is facilitated.

Specifically, a plurality of welding seams 4 are formed between the welding pad 1 and the bus bar 5 through laser welding, the welding seams 4 are concentrated in a welding area on the welding pad 1, namely, the position of the welding area can be fixed, and due to the fact that the instantaneous energy of laser welding is very high, in the embodiment of the utility model, the diode 2 can be prevented from being damaged by offset errors in the welding process through controlling the safe distance between the welding seams 4 and the diode 2.

In particularTaking the edge of the welding seam 4 closest to the diode 2 along the first direction as a first edge, taking the edge of the diode 2 closest to the welding seam 4 along the first direction as a second edge, wherein the first direction is the direction in which the welding pad 1 and the diode 2 are arranged side by side, and the safety distance between the welding seam 4 and the diode 2 can be the straight line distance between the first edge and the second edge along the first direction, as shown in fig. 2, wherein the safety distance D ₁ And the laser energy is more than or equal to 3mm, so that the diode 2 can be effectively prevented from being burnt by the laser energy in the welding process.

Exemplary, as shown in FIG. 2, the pad 1 extends along a length D of the first direction ₂ May be 13.+ -. 0.5mm, the length D of the pad 1 extending in the third direction ₃ May be 15±0.5mm, wherein the first direction may be a width direction of the pad 1, and the third direction may be a length direction of the pad 1. The length of the bonding region on the bonding pad 1 along the first direction may be 7±0.5mm, and the length of the bonding region along the third direction may be 10±0.5mm.

Specifically, the welding area is pressed down by the welding press head, the outgoing line 3 and the bonding pad 1 of the junction box can be flattened, then the laser passes through the inside of the press head to realize welding, the thickness of the outer wall of the press head can be 0.8+/-0.1 mm, the linear distance between the first edge and the second edge in the first direction, namely the safe distance between the welding seam 4 and the diode 2, can be controlled, and the safe distance is more than or equal to 3mm, so that the destructive risk on the diode 2 in the welding process is reduced.

Preferably, the safety distance is greater than or equal to 4.48mm and less than or equal to 6.48mm, so that the safety distance of the weld 4 from the diode 2 is sufficient to avoid the influence of the laser welding between the pad 1 and the bus bar 5 on the diode 2.

It should be noted that the embodiment of the present utility model is only illustrated, and after the terminal box result is adjusted, the safe distance between the weld seam 4 and the diode 2, that is, the linear distance between the first edge and the second edge in the first direction may be optimized accordingly.

Alternatively, the pad 1 may include a pad body and a welding portion, the welding portion may be used for laser welding with the bus bar 5, the weld 4 may extend through the bus bar 5 to the welding portion, and the pad body and the welding portion may be integrally formed to further improve structural stability of the pad 1.

Specifically, in the case where the pad body and the welded portion are integrally formed, the welded portion may also be scored at the edge thereof so as to position the welded portion. Or, the welding part can be positioned according to the data statistics result according to the actual requirement.

Alternatively, the pad body 11 may be provided with a groove, and the welding portion may be embedded in the groove, so as to achieve that the pad body 11 and the welding portion are spliced.

Alternatively, the bonding pad 1 and/or the bus bar 5 may be of a sheet-like structure and have a flat bonding surface, so that the bonding pad 1 and/or the bus bar 5 may be of an entirely flat plate structure without depressions and inclination, the operation of bonding the bonding pad 1 and the bus bar 5 may be facilitated, and the structures of the bonding pad 1 and the bus bar 5 may be simplified.

Alternatively, the plurality of welds 4 may constitute a weld pattern, the edge of which is at a minimum distance D from the edge of the pad 1 ₆ Can be greater than or equal to 1.5mm, enough space can be reserved on the bonding pad 1, so that the pressure head of the welding equipment is convenient to press down in the process of welding the bonding pad 1 and the bus bar 5 by laser.

Alternatively, the number of the weld seams 4 may be greater than or equal to four, and since the weld seams 4 extend into the bonding pad 1 through the bus bar 5, that is, the weld seams 4 function to fix the bonding pad 1 and the bus bar 5, ensuring that the number of the weld seams 4 is greater than or equal to four can improve the reliability and stability of the fixed connection between the bonding pad 1 and the bus bar 5.

Preferably, the number of welds 4 may be six.

Alternatively, a plurality of the welds 4 may be arranged in parallel. As shown in fig. 2, the length D of each weld 4 ₄ Can be more than or equal to 3mm, and the distance D between two adjacent welding seams 4 ₅ May be greater than or equal to 0.7mm to improve the reliability of laser welding between the pad 1 and the bus bar 5.

Optionally, the thickness of the bonding pad 1 may be greater than or equal to 0.8mm, so that the thickness of the bonding pad 1 can be effectively ensured, and the bonding pad 1 is prevented from being welded through.

Alternatively, the width of the bus bar 5 may be greater than or equal to 5mm, and the thickness of the bus bar 5 may be greater than or equal to 0.2mm, so as to effectively ensure that a plurality of weld seams 4 are formed between the pad 1 and the bus bar 5 to reliably fix the pad 1 and the bus bar 5.

Optionally, the junction box may further include a box body, which may include a box wall surrounding the bonding pad 1, and the minimum distance of the welding pattern from the box wall may be greater than or equal to 2.5mm so that there is enough space between the welding pattern and the box wall for the welding press head to press down the bus bar 5.

Alternatively, the end of the bonding pad 1 far away from the diode 2 can be provided with a positioning hole 11, and the bottom of the box body can be provided with a positioning column; the positioning column can be arranged in the positioning hole 11 in a penetrating way.

In the embodiment of the utility model, the positioning column penetrates through the positioning hole 11, so that the limiting connection between the bonding pad 1 and the bottom of the box body can be realized, and the bonding pad 1 can be further fixed in the box body.

Specifically, the number of positioning columns and the number of positioning holes 11 may be set in a one-to-one correspondence manner, as in the figure, only a case in which the number of positioning columns is four is illustrated, and the number of positioning columns may be set according to actual requirements, which is not particularly limited in the embodiment of the present utility model.

Alternatively, the minimum distance between the weld pattern and the positioning post may be greater than or equal to 1mm.

In the implementation of the utility model, the minimum distance between the welding pattern and the positioning column is greater than or equal to 1mm, so that a certain space can be reserved between the welding line 4 and the positioning column, and the positioning column can be prevented from interfering the pressure head of welding equipment in the welding process.

Alternatively, the pad body may be provided with a limit projection 13 at a position opposite to the diode 2; the bonding pad 1 is connected with a pin 21 of the diode 2 in a welding way; the spacing protrusion 13 extends along the first direction, the pin 21 may be disposed between the spacing protrusion 13 and the bottom of the box body, and the spacing protrusion 13 may be used to spacing the pin 21, so as to ensure that the pin 21 spreads along the first direction.

In the embodiment of the utility model, the pins 21 of the diode 2 can be limited by using the limiting protrusions 13, so that the pins 21 are ensured to be spread along the first direction, and the reliability of electric signal transmission of the diode 2 is improved.

Specifically, the extending direction of the limit projection 13 may coincide with the extending direction of the pin 21 of the diode 2.

Alternatively, the dimension of the limit projection 13 extending in the first direction may be 3.48±0.5mm.

Further, an end of the limit projection 13 away from the pad body has a gap with the diode 2 in the first direction, and the gap can be used for penetrating the lead-out wire 3 of the junction box.

In other alternative embodiments of the utility model, the number of pads 1 may include two; the two pads 1 may be symmetrically disposed at both sides of the diode 2 along the first direction; the two pads 1 are respectively soldered to the two pins 21 of the diode 2.

In the embodiment of the utility model, two pins 21 of the diode 2 are respectively welded by using two bonding pads 1, so that the convenience in arrangement of the diode 2 can be improved, and the signal transmission of the diode 2 is ensured.

Optionally, the junction box may include an arcuate connector; one end of the arched connecting piece can be fixedly connected with the limit protrusion 13 of one bonding pad 1, and the other end of the arched connecting piece can be fixedly connected with the limit protrusion 13 of the other bonding pad 1; the arched connection and the bottom of the box can enclose to form a receiving space, which can be used for placing the diode 2.

In the embodiment of the utility model, the arch-shaped connecting pieces are respectively connected with the limit protrusions 13 on the two bonding pads 1, so that the two pins 21 of the diode 2 can be effectively ensured to be spread on the same straight line.

Specifically, the arch-shaped connecting piece and the bottom of the box body enclose to form an accommodating space for placing the diode 2, so that the opening of the arch-shaped structure is downward opposite to the bottom of the box body, and the diode 2 and the bonding pad 1 are welded conveniently.

Specifically, the diode 2 may have an axial structure, two copper-based pins 21 are provided at both ends, and as shown, the pins 21 of the diode 2 may be soldered to the side of the bonding pad 1 near the bottom of the case.

Specifically, during the process of assembling the junction box, the pins 21 of the diode 2 may be welded to the bonding pads 1, and then the bonding pads 1 may be mounted in the box body through the cooperation of the positioning posts and the positioning holes 11.

The photovoltaic module provided by the embodiment of the utility model at least has the following advantages:

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the utility model.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.

The above description of the photovoltaic module provided by the present utility model has been provided in detail, and specific examples are applied herein to illustrate the principles and embodiments of the present utility model, and the above examples are only for helping to understand the method and core ideas of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims

1. A photovoltaic module comprising a junction box and a bus bar, wherein the junction box comprises a bonding pad and a diode; wherein,

2. The photovoltaic module of claim 1, wherein the pads and/or the bus bars are sheet-like structures and have a planar soldering surface.

3. The photovoltaic module of claim 1, wherein a plurality of the welds form a weld pattern, and wherein a minimum distance of an edge of the weld pattern from an edge of the solder pad is greater than or equal to 1.5mm.

4. The photovoltaic assembly of claim 3, wherein the junction box further comprises a box body comprising a box wall surrounding the solder pad, the solder pattern being a minimum distance from the box wall of greater than or equal to 2.5mm.

5. The photovoltaic module according to claim 4, wherein a positioning hole is formed at one end of the bonding pad away from the diode, a positioning column is arranged at the bottom of the box body, and the positioning column penetrates through the positioning hole.

6. The photovoltaic assembly of claim 5, wherein a minimum distance between the welding pattern and the positioning posts is greater than or equal to 1mm.

7. The photovoltaic module according to claim 4, wherein a side of the bonding pad opposite the diode is provided with a limit bump;

the bonding pad is connected with the pin of the diode in a welding way;

8. The photovoltaic module of claim 7, wherein the number of pads comprises two;

9. The photovoltaic assembly of claim 1, wherein the number of welds is greater than or equal to four.

10. The photovoltaic module of claim 1, wherein each weld has a length of greater than or equal to 3mm and a spacing between two adjacent welds is greater than or equal to 0.7mm.

11. The photovoltaic assembly of claim 1, wherein the bus bar has a width of greater than or equal to 5mm and a thickness of greater than or equal to 0.2mm.