CN211455703U

CN211455703U - Prevent latent single glass assembly structure who splits

Info

Publication number: CN211455703U
Application number: CN202020264019.8U
Authority: CN
Inventors: 梅金丽; 周欣
Original assignee: Cnbm Yixing New Energy Resources Co ltd
Current assignee: Cnbm Yixing New Energy Resources Co ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-09-08
Anticipated expiration: 2030-03-06

Abstract

The utility model discloses a hidden crack prevention single glass assembly structure, which relates to the field of solar cells and comprises front glass, a packaging layer, a solar cell layer, a packaging layer and a back plate which are sequentially stacked from bottom to top; the intraformational head busbar of solar cell divide into from top to bottom range upon range of long busbar and short busbar, long busbar and short busbar are bilateral symmetry two that distribute, two long busbars and two short busbars are respectively in nearly symmetry center department and draw forth a leading-out terminal, and the leading-out terminal all upwards buckles and pass encapsulation layer and backplate connection terminal box in proper order, be equipped with range upon range of insulating filler strip and EVA filler strip from top to bottom between long busbar and the short busbar, all set up two through-holes that two leading-out terminals that supply short busbar passed on insulating filler strip and the EVA filler strip. The utility model discloses draw original busbar from battery cluster back level and change into vertical drawing, stop from the root that to lead to at present the most factor of latent splitting, especially range upon range of influence that the action is latent to splitting to the battery cluster.

Description

Prevent latent single glass assembly structure who splits

Technical Field

The utility model relates to a solar cell field, concretely relates to prevent latent single glass assembly structure who splits.

Background

Subfissure is a bad phenomenon in the production of solar modules, and refers to a phenomenon that fine cracks which cannot be detected by naked eyes appear in a cell string after the cell string in the module is packaged. The current generated by the battery string is collected and led out by means of the main grid lines on the surface and the thin grid lines perpendicular to the main grid lines. When the thin grid lines are broken due to subfissure, the thin grid lines cannot transmit collected current to the main grid lines, and partial or even all of the battery strings can be caused to fail. Research shows that when the component is seriously hidden and cracked, the power loss of the component can be caused. Aging tests show that the temperature and humidity changes of the assembly can cause the aggravation of the subfissure of the battery strings under the working or non-working condition, and the battery strings without the subfissure in the assembly have stronger aging resistance than the subfissure battery strings.

The structure and the action of present single glass assembly head are fairly complicated, mainly move as shop glass, shop high penetrating EVA, put the battery cluster, short L busbar in the middle of the welding, level insert the EVA small strip, level insert keep apart the small strip, welding two length of side L busbars, shop put a whole EVA, level wear out the busbar, shop put a whole backplate, level wear out the busbar, loaded down with trivial details action can lead to the latent problem of splitting of subassembly head comparatively serious. In the current head design of single glass assembly, EVA and backplate are "a" word opening design usually, and EVA small strip/keep apart the small strip and usually be tongue mouth design, and the busbar is usually carried out right angle welding by two busbars and is formed L type busbar, and 4 busbars all are drawn forth from the battery cluster back level. Such a design can result in multiple forces being applied to the cell string, pressure of the EVA strips against their direct vertical direction, pressure of the isolation strip openings against their direct vertical direction, pressure of the bus bars against their direct contact at the outlet, pressure of the horizontal bus bars connected to the outlet against their contact, pulling force against their horizontal direction when the EVA strips/isolation strips are inserted, pulling force against the bus bars from the EVA and back sheets, which actions can act directly or indirectly on the 3 x 1 and 4 x 1 cells, or these materials can overlap the 3 x 1 and 4 x 1 cells, increasing the risk of the 3 x 1 and 4 x 1 cell subfractions.

At the same time, the compatibility of this design with the junction box is poor. For the current 5 main grid cell string, the distance between the 3 × 1 and 4 × 1 innermost main grids is about 34mm, the bus bar is 6mm, the distance between two welding terminals in the middle of the junction box is limited to be within 20mm, otherwise, the problem that the EVA/isolation small strip insertion cannot be realized can occur, or the insertion and breaking phenomenon in the process of the EVA/isolation small strip insertion occurs. For multi-master grid assemblies with more than 5 master grids, the compatibility issues of the old design assemblies and junction boxes are more pronounced.

Disclosure of Invention

An object of the utility model is to overcome the not enough of above-mentioned technique, provide a prevent single glass assembly structure of latent splitting, draw original busbar from battery cluster back level and change into vertical drawing, stop from the root that to lead to the most factor of latent splitting at present, especially range upon range of action is to the latent influence of splitting of battery cluster.

In order to realize the purpose of the utility model, the utility model adopts the technical scheme that: a hidden crack prevention single glass assembly structure comprises front glass, a packaging layer, a solar cell layer, a packaging layer and a back plate which are sequentially stacked from bottom to top, wherein a junction box is arranged on the back plate; the solar cell layer includes if dry battery cluster, connect the head busbar of battery cluster initial point and connect the terminal afterbody busbar of battery cluster, the head busbar divide into long busbar and the short busbar of range upon range of form distribution from top to bottom, and long busbar and short busbar are two that bilateral symmetry distributes, its characterized in that, two root length busbars and two short busbars are respectively in nearly symmetrical center department and draw forth a leading-out terminal, totally 4 leading-out terminals, and the leading-out terminal all upwards buckles and pass encapsulated layer and backplate connection terminal box in proper order, be equipped with range upon range of insulating backing strip and EVA backing strip from top to bottom between long busbar and the short busbar, all set up two through-holes that supply two leading-out terminals of short busbar to pass on insulating backing strip and the EVA backing strip.

Further, the insulating and EVA gaskets completely cover the short bus bars.

Furthermore, four through holes for four leading-out ends of the short bus bar and the long bus bar to pass through are formed in the packaging layer above the solar cell layer and the back plate.

Further, the through hole is a rectangular hole.

Furthermore, the outlet ends of the two short bus bars are positioned between the outlet ends of the two long bus bars.

Furthermore, four vertical lead ports are arranged in the junction box, and four lead ends of the short bus bar and the long bus bar are upwards connected to the lead ports respectively.

Furthermore, four wire outlet ends of the short bus bar and the long bus bar penetrate through the lead ports to be connected to the welding terminals, and the number of the welding terminals is four, and the welding terminals are correspondingly arranged on the left/right sides of the lead ports.

The utility model has the advantages that: the single-glass assembly structure changes the openings of the EVA gasket and the isolation gasket into 2 through holes, changes the openings of the EVA and the back plate into 4 through holes, and changes the outgoing line mode of the outgoing line end of the corresponding bus bar into vertical outgoing line mode, so that the problem of the hidden crack of the 3X 1 and 4X 1 solar single-glass assemblies can be obviously reduced, the production quality rate is improved, and the later reliability of the assembly is improved; meanwhile, the structure is easier to be compatible with the junction box, the structure can be matched with the junction box with any lead port interval, and the compatibility problem of the assembly and the junction box is effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is the structure schematic diagram of the insulating filler strip and the EVA filler strip of the present invention.

Fig. 3 is a schematic structural diagram of the encapsulation layer and the back plate above the solar cell layer according to the present invention.

Fig. 4 is a schematic structural diagram of the junction box of the present invention.

In the figure: the solar cell module comprises front glass 1, a packaging layer 2, a solar cell layer 3, a back plate 4, a junction box 5, a long bus bar 6, a short bus bar 7, a wire outlet end 8, an insulating gasket bar 9, an EVA gasket bar 10, a through hole 11, a lead port 12 and a welding terminal 13.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Example 1

As shown in fig. 1-4, a hidden crack prevention single glass assembly structure comprises a front glass 1, a packaging layer 2, a solar cell layer 3, a packaging layer 2 and a back plate 4 which are sequentially stacked from bottom to top, wherein a junction box 5 is arranged on the back plate 4; the solar cell layer 3 comprises a plurality of cell strings, a head bus bar connected with the starting ends of the cell strings and a tail bus bar connected with the tail ends of the cell strings, wherein the head bus bar is divided into a long bus bar 6 and a short bus bar 7 which are distributed in an up-down laminated manner, the long bus bar 6 and the short bus bar 7 are respectively distributed in bilateral symmetry, two wire outgoing ends 8 are respectively led out from the positions close to the symmetrical centers of the two long bus bars 6 and the two short bus bars 7, 4 wire outgoing ends 8 are provided in total, the wire outgoing ends 8 are bent upwards and sequentially penetrate through the packaging layer 2 and the back plate 4 to be connected with the junction box 5, an insulating gasket 9 and an EVA gasket 10 which are laminated up and down are arranged between the long bus bar 6 and the short bus bar 7, two through holes 11 for the two wire outgoing ends 8 of the short bus bar 7 to penetrate through are respectively formed in the insulating gasket 9 and the EVA gasket 10; the insulating and EVA gaskets 9, 10 completely cover the short busbar 7; four through holes 11 for four outlet ends 8 of the short bus bar 7 and the long bus bar 6 to pass through are formed in the packaging layer 2 and the back plate 4 above the solar cell layer 3; the outlet ends 8 of the two short bus bars 7 are positioned between the outlet ends 8 of the two long bus bars 6; four vertical lead ports 12 are arranged in the junction box 5, and four lead terminals 8 of the short bus bar 7 and the long bus bar 6 are respectively connected to the lead ports 12 upwards; four wire outlets 8 of the short bus bar 7 and the long bus bar 6 are connected to the welding terminals 13 through the wire ports 12, and the welding terminals 13 are four and correspondingly arranged on the left/right sides of the wire ports 12.

The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims

1. A hidden crack prevention single glass assembly structure comprises front glass, a packaging layer, a solar cell layer, a packaging layer and a back plate which are sequentially stacked from bottom to top, wherein a junction box is arranged on the back plate; the solar cell layer includes if dry battery cluster, connect the head busbar of battery cluster initial point and connect the terminal afterbody busbar of battery cluster, the head busbar divide into long busbar and the short busbar of range upon range of form distribution from top to bottom, and long busbar and short busbar are two that bilateral symmetry distributes, its characterized in that, two root length busbars and two short busbars are respectively in nearly symmetrical center department and draw forth a leading-out terminal, totally 4 leading-out terminals, and the leading-out terminal all upwards buckles and pass encapsulated layer and backplate connection terminal box in proper order, be equipped with range upon range of insulating backing strip and EVA backing strip from top to bottom between long busbar and the short busbar, all set up two through-holes that supply two leading-out terminals of short busbar to pass on insulating backing strip and the EVA backing strip.

2. The concealed crack resistant single glass assembly structure of claim 1, wherein the insulating and EVA gaskets completely cover the short bus bars.

3. The anti-subfissure single glass assembly structure according to claim 1, wherein four through holes for passing through four outlet ends of the short bus bar and the long bus bar are formed in the packaging layer and the back plate above the solar cell layer.

4. The anti-subfissure single glass assembly structure as claimed in claim 1 or 3, wherein the through hole is a rectangular hole.

5. The anti-subfissure glass unit structure as claimed in claim 1, wherein the outlet ends of the two short busbars are located between the outlet ends of the two long busbars.

6. The anti-subfissure single glass assembly structure according to claim 1, wherein four vertical lead ports are arranged in the junction box, and four lead ends of the short bus bar and the long bus bar are upwards connected to the lead ports respectively.

7. The anti-subfissure glass assembly structure as claimed in claim 6, wherein the four wire outlets of the short and long bus bars are connected to the four welding terminals through the wire ports, and the four welding terminals are correspondingly disposed at the left/right sides of the wire ports.