阅读说明：本技术 光伏玻璃及光伏组件 (Photovoltaic glass and photovoltaic module ) 是由 刘秤明 黄猛 车伏龙 覃武 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种光伏玻璃及光伏组件,光伏玻璃包括玻璃板,玻璃板的一面设有凹槽,凹槽内设有第一汇流条以及绝缘条；光伏组件包括该光伏玻璃,光伏玻璃为前玻璃板,前玻璃板包括设有AR减反摸的第一表面和为绒面的第二表面；光伏组件的电池片的排布结构为：L个电池串组,每个电池串组包括M列电池串,每列电池串包括N个多分片,电池串组设有并联在第一汇流条上的第二汇流条和引出到光伏组件外与接线盒连接的第三汇流条,第三汇流条包括正、负接线端,第一汇流条设于两列电池串之间或电池串的外侧。与现有技术比较,本发明节约了成本、提高了生产效率,还提高了光伏组件的发电效率。(The invention discloses photovoltaic glass and a photovoltaic module, wherein the photovoltaic glass comprises a glass plate, one surface of the glass plate is provided with a groove, and a first bus bar and an insulating bar are arranged in the groove; the photovoltaic module comprises the photovoltaic glass, the photovoltaic glass is a front glass plate, and the front glass plate comprises a first surface provided with an AR antireflection film and a second surface which is a suede surface; the arrangement structure of the cell pieces of the photovoltaic module is as follows: the photovoltaic module comprises L battery string groups, each battery string group comprises M battery strings, each battery string group comprises N multi-piece batteries, each battery string group is provided with a second bus bar connected in parallel to a first bus bar and a third bus bar led out of the photovoltaic module and connected with the junction box, each third bus bar comprises a positive terminal and a negative terminal, and the first bus bar is arranged between the two battery strings or outside the battery strings. Compared with the prior art, the photovoltaic module and the manufacturing method thereof have the advantages that the cost is saved, the production efficiency is improved, and the power generation efficiency of the photovoltaic module is also improved.)

1. The photovoltaic glass comprises a glass plate and is characterized by further comprising a first bus bar arranged in the glass plate, wherein the first bus bar comprises a welding end exposed out of the surface of the glass plate.

2. The photovoltaic glass of claim 1, wherein one side of the glass sheet is provided with a strip-shaped groove, the first bus bar is embedded in the groove, and two ends of the first bus bar are exposed out of the groove.

3. The photovoltaic glass of claim 2, wherein the glass sheet further comprises an insulating strip embedded within the groove to confine the first bus bar within the groove.

4. A photovoltaic module, characterized in that it comprises a photovoltaic glass according to claims 1 to 3.

5. The photovoltaic module according to claim 4, wherein the arrangement of the cells of the photovoltaic module is as follows: l battery string groups, each battery string group includes M battery strings, and every battery string includes a plurality of burst of N, M of M battery string is the odd number, the N of a plurality of bursts of N is non-0's natural number, L of L battery string groups is 2.

6. The photovoltaic module according to claim 5, wherein the arrangement of the cells of the photovoltaic module is as follows: 2 battery string groups, each battery string group comprises 5 columns of battery strings, and each column of battery strings comprises 16 multi-slices.

7. A photovoltaic module according to any of claims 4 to 6, wherein the photovoltaic glass is a front glass sheet of the photovoltaic module, the front glass sheet comprising a first surface disposed outside the photovoltaic module, the first surface being provided with an AR reduction film.

8. The photovoltaic module of claim 7, wherein the photovoltaic glass further comprises a second surface opposite the first surface, the second surface being textured.

9. The photovoltaic module according to any one of claims 5 or 6, wherein each of the cell strings is provided with a second bus bar for connecting the cells in the cell string in series, the second bus bars are connected in parallel to the first bus bar, and the first bus bar is led out of the photovoltaic module through a third bus bar.

10. The assembly according to any one of claims 9, further comprising a back glass plate having a through hole, wherein the third bus bar comprises positive and negative terminals leading out of the assembly through the through hole.

11. The photovoltaic module of claim 5, wherein the first bus bar is disposed between two adjacent columns of cell strings.

12. The photovoltaic module of claim 5, wherein the first bus bars are disposed in parallel outside the cell strings of the outermost columns.

Technical Field

The invention relates to the technical field of solar power generation equipment, in particular to photovoltaic glass and a photovoltaic module.

Background

Photovoltaic power generation is a power generation technology that directly converts solar energy into electrical energy by using the photovoltaic effect of a semiconductor interface. At present, photovoltaic power generation has received wide attention from countries all over the world and has developed into a new emerging industry. The photovoltaic module is formed by connecting and tightly packaging a plurality of single solar cells in series and in parallel, and is a photovoltaic cell combination device which can realize minimum inseparable photovoltaic power generation, however, the cells of the general photovoltaic module are singly welded and series welded through welding tapes, the front electrode of the front cell is connected with the back electrode of the back cell and is heated and welded together, by analogy, the cells of one cell are connected in series to form a cell string, then the welded cell string is typeset and welded with a first bus bar, the leading-out end of the first bus bar is connected in series with bypass diodes and the like in a junction box, the positive electrode and the negative electrode are led out, and finally the photovoltaic module is formed through a series of module manufacturing processes.

The single-glass photovoltaic module generally adopts a sandwich structure of glass/packaging material/battery piece/packaging material/back plate, and a frame is additionally arranged on the periphery of the single-glass photovoltaic module to ensure the mechanical property of the module and facilitate installation. The double-glass photovoltaic module adopts a sandwich structure of glass/packaging material/cell piece/packaging material/glass, no frame is additionally arranged around the double-glass photovoltaic module, wherein the glass is generally toughened photovoltaic glass, the packaging material is packaging adhesive films such as EVA (ethylene vinyl acetate), POE (polyolefin elastomer), PVB (polyvinyl butyral) and the like, and the cell piece is a single crystal or polycrystalline cell piece.

Conventional photovoltaic modules are typically in a series circuit configuration of 60P type (6 strings × 10 sheets) or 72P type (6 strings × 12 sheets). With the development of half-slice and multi-slice technologies, a 120P version (6 strings × 10 half-slices × 2) or 144P version (6 strings × 12 half-slices × 2) series-parallel circuit structure is developed. However, with the industrialization of large-size silicon wafers of 210mm and the like, limited by the limitation of the maximum size of the module, the circuit layout structure of the conventional module cannot be compatible with the large-size silicon wafers, and for the large-size silicon wafers of not less than 210mm, a 150P type (5 strings × 15 three-piece × 2) series-parallel circuit structure is proposed in the industry, as shown in fig. 3 and 5, due to the limitation of the positive and negative electrode layout of the battery pieces, the odd number of strings of the photovoltaic module will inevitably have two strings of battery pieces with the same positive and negative electrode arrangement, so that when the photovoltaic module is installed, a placement area of a first bus bar must be reserved to connect the positive and negative electrodes of the two strings of battery pieces in series, but the area and the weight of the module are increased by presetting the first bus bar area, the power generation efficiency of the module is reduced, the transportation and installation costs of the module are increased, and the difficulty of the module manufacturing process, affecting the production efficiency and the yield of the product.

Disclosure of Invention

The invention provides photovoltaic glass and a photovoltaic module, and solves the problems of increased cost, low production efficiency and the like caused by the fact that a first bus bar installation area needs to be reserved when the photovoltaic module in the prior art is installed.

The technical scheme adopted by the invention is as follows: the photovoltaic glass comprises a glass plate and a first bus bar arranged in the glass plate, wherein the first bus bar comprises a welding end exposed out of the surface of the glass plate.

Furthermore, one side of the glass plate is provided with a strip-shaped groove, the first bus bar is embedded in the groove, and two ends of the first bus bar are exposed out of the groove.

Further, the glass plate further includes an insulating bar embedded in the groove to confine the first bus bar within the groove.

A photovoltaic module comprises the photovoltaic glass.

Further, the arrangement structure of the cell pieces of the photovoltaic module is as follows: l battery string groups, each battery string group includes M battery strings, and every battery string includes a plurality of burst of N, M of M battery string is the odd number, the N of a plurality of bursts of N is non-0's natural number, L of L battery string groups is 2.

Further, the arrangement structure of the cell pieces of the photovoltaic module is as follows: 2 battery string groups, each battery string group comprises 5 columns of battery strings, and each column of battery strings comprises 16 multi-slices.

Further, photovoltaic glass is photovoltaic module's preceding glass board, preceding glass board is including locating the outer first surface of photovoltaic module, the first surface is equipped with AR and subtracts anti-touch.

Further, the photovoltaic glass also comprises a second surface opposite to the first surface, and the second surface is a textured surface.

Furthermore, each battery string group is provided with a second bus bar for connecting the battery pieces in the battery string group in series, the second bus bars are connected to the first bus bar in parallel, and the first bus bar is led out of the photovoltaic module through a third bus bar.

Further, photovoltaic module still includes the back of the body glass board, the back of the body glass board is equipped with the through-hole, the third busbar includes through the through-hole draw forth in the outer positive, negative terminal of photovoltaic module.

Further, the first bus bar is arranged between two adjacent columns of the battery strings.

Further, the first bus bars are arranged on the outer sides of the battery strings in the outermost rows in parallel.

Compared with the prior art, the photovoltaic glass is integrated with the first bus bar, so that the photovoltaic glass can be directly installed without reserving the position of the first bus bar in a series-parallel circuit structure with odd number of strings such as 150P type (5 strings multiplied by 15 three segments multiplied by 2), and the like, thereby saving the cost and improving the production efficiency; the interval between the cell strings can be reduced, so that the area of a photovoltaic module made of the photovoltaic glass is smaller, and the power generation efficiency of the photovoltaic module is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic cross-sectional view of a photovoltaic glass according to the present invention;

FIG. 2 is a schematic cross-sectional view of a photovoltaic module according to the present invention;

FIG. 3 is a schematic diagram showing a mounting structure of a prior art primary bus bar of the first embodiment;

fig. 4 is a schematic diagram of the mounting structure of the primary bus bar in the present aspect of the first embodiment;

fig. 5 is a schematic diagram showing a mounting structure of a prior art primary bus bar of the second embodiment;

fig. 6 is a schematic view of the mounting structure of the primary bus bar in the present embodiment of the second embodiment.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides photovoltaic glass, as shown in fig. 1, the photovoltaic glass comprises a glass plate 1, a groove is formed in the glass plate 1, a first bus bar 2 is embedded in the groove, two ends of the first bus bar 2 are welding ends, an insulating bar 3 is further arranged at a notch of the groove, the insulating bar 3 seals the notch of the groove to fix a main body of the first bus bar 2 in the glass plate 1, meanwhile, two welding ends of the first bus bar 2 are exposed out of the surface of the glass plate 1, and the insulating bar has the insulating characteristic. The two ends of the first bus bar 2 can be connected with different circuit structures respectively, so that the two bus bars can be conveniently connected in series or in parallel, the position of a reserved wiring or bus bar is not needed, and the purposes of convenience in installation and space saving are achieved.

The photovoltaic glass is mainly used in photovoltaic modules, in particular to a photovoltaic module with a module circuit structure of M-string multiplied by N multi-segment multiplied by L in the prior art, wherein M is an odd number, generally 5, N is a natural number which is not 0, generally 10, 12 and 15, and L is a natural number which is not 0, generally 2; the battery pieces in the embodiment are sliced battery pieces, and are generally 1/2 pieces, 1/3 pieces, 1/4 pieces, 1/5 pieces and the like.

Preferably, the invention is described by taking a 150P version (5 strings × 15 three segments × 2) for a large-size silicon wafer module of 210mm and the like, that is, an arrangement structure of cells of a photovoltaic module includes 2 cell string groups, each cell string group includes 5 columns of cell strings, and each column of cell strings includes a photovoltaic module of a 16-multi-segment series-parallel circuit structure as an example.

In the photovoltaic module of this type, as shown in fig. 2, the photovoltaic glass proposed in the present invention is used as a front glass plate of the photovoltaic module, the first bus bar 2 is integrated on the front glass plate, two welding ends of the first bus bar 2 are disposed towards an assembly surface of the front glass plate and the battery string group 8, the lower end of the battery piece is a back glass plate 4, the light transmittance of the back glass plate 4 is generally required to be equal to or greater than 88%, 3 through holes 41 are distributed on a position of the back glass plate 4 where the junction box is mounted, the through holes 41 are disposed at intervals in the middle position of the back glass plate 4, positive and negative electrodes of the photovoltaic module extend out from the through holes 41 to be electrically connected with the junction box, the aperture of the through holes 41 is determined according to the size of the wiring, the position of the through holes is determined according to the layout design of the battery string group, and the size and the thickness of.

And the packaging adhesive films 5 are arranged among the front glass plate, the battery string group 8 and the back glass plate 4, when the assembly is laminated, the packaging adhesive films 5 can be melted at high temperature to generate a cross-linking reaction, so that the effect of packaging and protecting the battery piece is achieved, and the photovoltaic assembly is finally formed through a series of assembly manufacturing processes.

The photovoltaic module comprises two battery string groups, the two battery string groups are distributed in a mirror-image up-down symmetrical mode, the general type of the structure can refer to the prior art disclosed in the patent with the application number of 201621230989.6, the description of the application is omitted, the battery string group above the photovoltaic module is provided with a second bus bar 6 at the uppermost end, and the second bus bar 6 is used for connecting all the battery pieces in the battery string group in series; similarly, a second bus bar 6 is also arranged at the lowest end of the lower battery string group, and the second bus bar 6 connects the battery pieces in the lower battery string group in series; a third bus bar 7 is further arranged between the upper cell group and the lower cell group, the third bus bar 7 is led out of the photovoltaic module through the back glass plate 4 and mainly comprises a positive electrode and a negative electrode, and the third bus bar 7 is connected with bypass diodes and the like in the junction box in series through the positive electrode and the negative electrode to form a module circuit structure.

In the present application, the two welding terminals of the first bus bar 2 are respectively connected to the upper and lower two second bus bars 6, and one of the welding terminals of the first bus bar 2 is also connected to the third bus bar 7, so that the upper and lower battery strings are connected in parallel to the first bus bar 2 and connected to the junction box through the third bus bar 7.

As shown in fig. 3, in the prior art in the first embodiment, the first bus bar 2 is disposed on the outermost side in the row-to-row distribution direction of the battery strings, that is, on the outer side of the battery string in the outermost row, and the first bus bar 2 is disposed substantially in parallel with each row of the battery strings; as shown in fig. 4, the first bus bar 2 in the present embodiment in the first embodiment is integrally provided in the front glass plate.

As shown in fig. 5, in the prior art in the second embodiment, the first bus bars 2 in this embodiment are arranged in parallel between a row of battery strings and an adjacent row of battery strings; as shown in fig. 6, the first bus bar 2 of the present embodiment in the second embodiment is integrally provided in the front glass plate

As can be seen from the above, in the prior art, a region with a certain width needs to be reserved in the same parallel position as the battery string group to mount the first bus bar 2, generally, the region does not interfere with other internal structures, and the area of the region is relatively large; in the first embodiment or the second embodiment, due to the design of the scheme, the first bus bar 2 is integrally arranged in the front glass plate, so that the reserved space can be omitted, the front glass plate can be directly installed, the cost is saved, the production efficiency is improved, and meanwhile, due to the arrangement of the insulating bar 3, the safety of the circuit structure is greatly improved.

Simultaneously, according to photovoltaic module efficiency promotion formula: η = Pm/(S1-S2) -Pm/S1 (where Pm is the module output power; S1 is the module area; S2 is the reserved first bus bar 2 placement area): the smaller the area of the first bus bar 2 placement region is, the higher the power generation efficiency of the photovoltaic module is, and therefore the power generation efficiency of the photovoltaic module can be obviously improved.

Preferably, the thickness of the photovoltaic glass is 2.0mm/2.5mm/3.2 mm; the width of the first bus bar 2 is 4 mm-10 mm, the thickness thereof is 0.4 mm-0.8 mm, the thickness of the insulating bar 3 is 0.4 mm-0.8 mm, and the length and the width thereof are consistent with the first bus bar 2. The arrangement is convenient for the integral installation of the photovoltaic module, and the structural stability of the photovoltaic glass is easy to maintain.

Preferably, the photovoltaic glass adopted in the photovoltaic module is generally traditional photovoltaic toughened glass or semi-toughened glass, the front glass plate comprises a first surface irradiated by sunlight, and the first surface is provided with a layer of AR antireflection film, so that sunlight reflection can be reduced; the front glass plate also comprises a second surface facing the battery string group, the second surface is a microstructure with a suede surface and has an anti-reflection effect on sunlight, and therefore the light transmittance of the front glass plate is enabled to be larger than or equal to 91%.

Preferably, the insulating strip 3 of the present invention is made of EVA, and is embedded with the first bus bar 2 in the photovoltaic glass to form an integrated design.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.