阅读说明：本技术 一种基于接线盒应用的叠片组件电气结构 (Lamination assembly electrical structure based on junction box application ) 是由 赵志楠 张昌远 何涛 于 2019-08-20 设计创作，主要内容包括：本发明公开了一种基于接线盒应用的叠片组件电气结构,包括叠片电池串、串端汇流条、并联汇流条、旁路汇流条、拐角汇流条、引出线接线盒和中间体接线盒,所述叠片电池串是将若干电池小片通过导电介质采用叠瓦式排布形成无片间距的电池串,叠片电池串两端焊接串端汇流条,采用横排或竖排的模式,并联汇流条实现不同电池串同电位并联,旁路汇流条一端连接并联汇流条,一端引出组件,连接接线盒内二极管,通过拐角汇流条实现不同旁路汇流条引出,每个接线盒内有且只有一个二极管,接线盒之间实现组件二极管并联。通过改变引出线接线盒位置、改变中间体接线盒位置和数量,实现不同版型叠片组件接线盒通用,降低成本,实现叠片组件电路灵活设计。(The invention discloses a laminated assembly electrical structure based on junction box application, which comprises a laminated battery string, a string end bus bar, a parallel bus bar, a bypass bus bar, a corner bus bar, a leading-out wire junction box and a middle body junction box, wherein a plurality of battery small pieces are arranged in a shingled manner through conductive media to form a battery string without piece spacing, the string end bus bars are welded at two ends of the laminated battery string, the parallel bus bars are in a horizontal or vertical mode, the parallel bus bars realize the same potential parallel connection of different battery strings, one end of the bypass bus bar is connected with the parallel bus bar, one end of the bypass bus bar leads out of the assembly, the assembly is connected with diodes in the junction box, the leading-out of different bypass bus bars is realized through the corner bus bar, only one diode is arranged in each junction box, and the assembly diodes are. Through changing the position of the outgoing line junction box and the position and the number of the intermediate junction boxes, the lamination assembly junction boxes of different types are universal, the cost is reduced, and the flexible design of the lamination assembly circuit is realized.)

1. A laminate assembly electrical structure based on a junction box application, characterized in that: including lamination battery cluster, cluster end busbar, parallel bus bar, bypass busbar, turning busbar, lead-out wire terminal box and midbody terminal box, lamination battery cluster adopts the shingled formula to arrange the battery cluster that forms no piece interval with a plurality of battery tablets through conducting medium, lamination battery cluster both ends welding cluster end busbar adopts the mode of horizontal row or vertical row, parallel bus bar realizes that different battery clusters are parallelly connected with the electric potential, parallel bus bar is connected to bypass busbar one end, the subassembly is drawn forth to one end, connect the interior diode of terminal box, realize through the turning busbar that different bypass busbars are drawn forth, there is and only a diode in every terminal box, realize that the subassembly diode is parallelly connected between the terminal box.

2. The lamination assembly electrical structure based on the junction box application as claimed in claim 1, wherein: a lamination subassembly possesses 4 or more than 4 terminal boxes at least, including 2 lead-out wire terminal boxes and 2 or more than 2 midbody terminal boxes, and the terminal box is installed equally to the equidistance or regional gathering installation.

3. The lamination assembly electrical structure based on the junction box application as claimed in claim 1, wherein: the length of the box body of the outgoing line junction box and the intermediate junction box is less than or equal to 70mm, and the width of the box body of the outgoing line junction box and the intermediate junction box is less than or equal to 25 mm.

4. The lamination assembly electrical structure based on the junction box application as claimed in claim 1, wherein: the laminated battery string end is welded with a string end bus bar, the string end bus bar is formed by stamping an ultrathin bus bar, and the thickness of the ultrathin bus bar is 0.1-0.15 mm.

5. The lamination assembly electrical structure based on the junction box application as claimed in claim 1, wherein: the parallel bus bar is perpendicular to the direction of the battery strings, the parallel bus bar is connected with the same potential of different battery strings of the laminated assembly to realize the parallel connection at the same potential, the parallel bus bar is led out by welding the back electrode of the laminated battery piece, segmenting the battery strings or adopting an ultrathin interconnection welding strip, the thickness of the parallel bus bar is less than or equal to 0.2mm, the width of the parallel bus bar is greater than or equal to 5mm, the parallel bus bar equally divides the laminated assembly into the battery strings in different areas, the parallel bus bar divides the laminated assembly into 4 or more than 4 areas, and each area is at least protected by one diode.

6. The lamination assembly electrical structure based on the junction box application as claimed in claim 1, wherein: the bypass bus bar is parallel to the battery string, one end of the bypass bus bar is connected with the parallel bus bar, the other end of the bypass bus bar leads out of the assembly and is connected with the junction box, the bypass bus bar is a conventional bus bar or an ultrathin bus bar, and the cross-sectional area is larger than or equal to 1mm when the ultrathin bus bar is adopted.

7. The lamination assembly electrical structure based on the junction box application as claimed in claim 1, wherein: the inflection point bus bar is led to the outside of the assembly from a battery string back glue film and a back plate, a pair of holes are punched in each junction box, the length of each hole is smaller than or equal to 10mm, the width of each hole is smaller than or equal to 7mm, the distance between the two holes is smaller than or equal to 50mm, the bus bars are placed in a relative overlapping mode after being punched, the exposed portions are lifted up to form the inflection point bus bar after being laminated and are connected with the junction boxes, the corner bus bar is an ultrathin bus bar, and the cross-sectional area.

8. The lamination assembly electrical structure based on the junction box application as claimed in claim 1, wherein: the outgoing line junction box and the intermediate junction box are the same junction box.

Technical Field

The invention belongs to the field of solar photovoltaic cells, and particularly relates to an electrical structure of a laminated assembly based on junction box application.

Background

The lamination technology is connected through conductive adhesive or other conductors, and the long-strip-shaped battery pieces cut by laser are overlapped and welded in a 'tiling' mode to form a long-strip-shaped battery string without piece intervals. The laminated assembly improves the effective power generation area of the assembly by eliminating the space between the battery plates, and greatly improves the power of the assembly under the condition that the size of the assembly is not changed or is slightly increased. The laminated assembly is one of the main technical routes of high-power assemblies at present, and has the characteristics of large effective light-emitting area of the assembly, high assembly power and efficiency, high battery piece recycling rate and the like.

According to the appearance classification of the assembly, the laminated assembly is mainly divided into two types of horizontal and vertical; according to the number classification of the diodes, the laminated assemblies are divided into double diodes, triple diodes and more than triple diodes; the integrated junction box, the two-part junction box, the three-part junction box and the like are divided according to the number of the junction boxes. The design modes of the laminated assembly diode are flexible and various, so that the parallel connection method of the laminated assembly diode is different from the installation mode of the junction box. A common electrical structure of a transverse laminated assembly comprises a split double diode and a bipartite double diode; common vertical lamination subassembly includes bipartite body terminal box double diode, the three-phase body terminal box three diode, bipartite body terminal box four diode, and different board types and electrical structure cause the used terminal box size of lamination subassembly and model different, cause the terminal box kind numerous, be not convenient for the unified management in the manufacturing process.

Disclosure of Invention

In order to solve the problems, the invention discloses an electric structure of a laminated assembly based on the application of a junction box.

A laminated assembly electrical structure based on junction box application realizes series-parallel connection of different laminated assembly electrical structures through a bus bar with a special corner and a small-volume split junction box. The laminated assembly electrical structure comprises a laminated battery string, a serial end bus bar, a parallel bus bar, a bypass bus bar, a corner bus bar, a lead-out wire junction box and a middle body junction box. String end bus bars are welded at two ends of a laminated battery string, a transverse mode or a vertical mode is adopted, parallel bus bars realize that different battery strings are connected in parallel with the same potential, one end of each bypass bus bar is connected with the parallel bus bars, one end of each bypass bus bar leads out an assembly, diodes in junction boxes are connected, different bypass bus bars are led out through designing special corner bus bars, the junction boxes are connected to realize that assembly diodes are connected in parallel, each junction box is internally provided with one diode and only one diode, the junction boxes are connected through changing the positions of outgoing line junction boxes and changing the positions and the number of intermediate junction boxes, and the laminated assembly junction boxes with.

The laminated battery string is characterized in that battery pieces are divided into different small pieces in a laser slicing mode, the battery strings without piece intervals are formed by conducting media in a imbricated arrangement mode, the conducting media can be conductive adhesive, ultrathin solder strips, tin-lead solder paste, conductive adhesive films and the like, and the laminated connection mode has no specific requirements. The side length of the laminated cell slice ranges from 156.75 mm to 166mm, the number of the cell slices ranges from 1/3 mm to 1/8, and the size and the number of the cell slices are not particularly limited.

The end of the laminated battery string is welded with a string end bus bar, the string end bus bar is formed by stamping an ultrathin bus bar, the thickness of the ultrathin bus bar is 0.1-0.15mm, the width of the bus bar is 7-20mm, and the bus bar with the width of more than 15mm is in a turnover mode after welding. Under the condition that the battery string is not deformed after welding, the stamping shape of the string end bus bar is not limited.

The parallel bus bar is perpendicular to the direction of the battery strings, is connected with the same potential of different battery strings of the laminated assembly to realize the parallel connection at the same potential, can be led out by directly welding the back electrode of the laminated battery piece, segmenting the battery strings or adopting an ultrathin interconnection welding strip, and has no limit on the lead-out mode of the parallel bus bar. The thickness of the parallel bus bar is less than or equal to 0.2mm, and the width of the parallel bus bar is more than or equal to 5 mm. The parallel bus bars equally divide the lamination assembly into different zones of cell strings, the parallel bus bars divide the lamination assembly into 4 or more than 4 zones, each zone being protected by at least one diode.

The bypass bus bar is parallel to the battery string, one end of the bypass bus bar is connected with the parallel bus bar, the other end of the bypass bus bar is led out of the assembly and connected with the junction box, the bypass bus bar can be a conventional bus bar, and also can be an ultrathin bus bar, and when the ultrathin bus bar is adopted, the cross-sectional area of the bus bar is required to be larger than or equal to 1 mm.

The corner bus bar is designed according to the plate type of the assembly, the conventional bus bar can be adopted, the ultrathin bus bar can also be adopted, and the cross-sectional area of the bus bar is required to be larger than or equal to 1mm when the ultrathin bus bar is adopted.

The lamination terminal box group of this patent design includes lead-out wire terminal box and midbody terminal box, and the lead-out wire terminal box includes anodal cable and negative pole cable terminal box, and every subassembly only has 2 lead-out wire terminal boxes, by 2 midbody terminal boxes at least, and terminal box position and cable direction are decided by the electric structural design of subassembly.

The invention has the beneficial effects that:

according to the invention, by designing the bus bar with the special inflection point, matching with the junction boxes with uniform size, and designing different junction box groups, the same junction box can try different plate-type laminated assemblies, unified management is realized, the die sinking authentication cost of the junction boxes with different models is reduced, the production flexibility of the laminated assemblies is improved, and the market competitiveness of enterprises is improved.

Drawings

Fig. 1 is a design diagram of the opening size of the back EVA and the back sheet (glass) and the bus bar leading-out mode.

FIG. 2 is a pattern of bus bars flipped over after lamination through an aperture

FIG. 3 illustrates a module with bus bars flipped up and terminal blocks linked after lamination

FIG. 4 is a diagram of the bus bar arrangement and diode connection of the co-located parallel junction box.

FIG. 5 is a diagram of the staggered parallel junction box bus bar arrangement and diode wiring.

FIG. 6 is a schematic view of a co-located parallel junction box.

Fig. 7 is an appearance arrangement of the dislocated parallel junction box.

FIG. 8 is a schematic diagram of the layout of the external and internal leads of the co-located parallel junction box.

Fig. 9 is a schematic view of the external appearance and internal lead wire arrangement of the staggered parallel junction box.

FIG. 10 is a diagram of an assembly employing co-located parallel junction boxes.

Fig. 11 is a partially enlarged view of fig. 10.

Fig. 12 is a diagram of an assembly employing an offset parallel terminal block.

Fig. 13 is a partially enlarged view of fig. 12.

Detailed Description

The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.

FIG. 1 shows a design mode of punching a back plate (glass) and a glue film of a single junction box, wherein a pair of square holes 1-1 are punched at the same position of the back plate and a white glue film at each junction box. The glass back plate can adopt a mode of pre-opening a round hole, and the back glue film punching (the position of the back glue film is the same as that of the glass hole, and the size of the back glue film punching is slightly larger than that of the glass hole) is matched to realize the leading-out of the bus bar on the back of the double-glass assembly. The bus bars are oppositely led out through the punched holes, 1-2 is led out to the center, the left and right leading-out wires 1-2 and 1-3 are partially overlapped by 1-4 in two middle areas, and the bus bars can adopt thin bus bars, 5 × 0.2mm bus bars and preferably 7 × 0.15mm bus bars on the premise of ensuring the safety of fusing current.

After the assembly is laminated, the exposed end of the bus bar is turned up to be perpendicular to the assembly back plate, so that the junction box is convenient to install. Fig. 2 shows a method for folding the bus bar leading-out end after the assembly is laminated, the bus bar 1-2 'passes through the back plate (back glass) and the back glue film from the hole 1-1 and is led out from the hole, and the bus bar leading-out part 1-3' is folded upwards perpendicular to the assembly plane.

FIG. 3 shows the installation mode of the junction box after the bus bar is folded, the bus bar 1-2 'penetrates through a back plate (back glass) and a back glue film from a hole 1-1, a bus bar leading-out part 1-3' is perpendicular to the plane of the assembly, is folded upwards, penetrates through a jack of the junction box 3-1, and is welded with the junction box through the bus bar and the junction box.