阅读说明：本技术 一种太阳能光伏电池组件的连接结构 (Connecting structure of solar photovoltaic cell module ) 是由 单伶宝 于 2020-08-05 设计创作，主要内容包括：本发明公开了一种太阳能光伏电池组件的连接结构,包括若干相互电连的电池。所述电池上均设有金属导线结构,相邻两个所述电池上的金属导线结构均通过导电连接件串联以形成电流输送回路。所述金属导线结构包括设置在电池正面的正面金属格栅、设置在电池背面的背面金属格栅,所述正面金属格栅至少包括一根正面连接主栅,所述背面金属格栅至少包括一根背面连接主栅。所述导电连接件的一端与一个电池的正面连接主栅电连,另一端与另一个电池的背面连接主栅电连。本发明的连接结构能有效形成太阳能光伏电池之间的可靠电连接,而且简化了工艺,降低了生产成本,提升了太阳能光伏电池组件的生产良率和产品可靠度。(The invention discloses a connecting structure of a solar photovoltaic cell module, which comprises a plurality of cells electrically connected with each other. All be equipped with the metal wire structure on the battery, adjacent two the metal wire structure on the battery all connects in series so as to form the current transport return circuit through electrically conductive connecting piece. The metal wire structure comprises a front metal grid arranged on the front side of the battery and a back metal grid arranged on the back side of the battery, the front metal grid at least comprises a front connection main grid, and the back metal grid at least comprises a back connection main grid. One end of the conductive connecting piece is electrically connected with the front side connecting main grid of one battery, and the other end of the conductive connecting piece is electrically connected with the back side connecting main grid of the other battery. The connecting structure can effectively form reliable electric connection between the solar photovoltaic cells, simplifies the process, reduces the production cost and improves the production yield and the product reliability of the solar photovoltaic cell module.)

1. A connecting structure of a solar photovoltaic cell module comprises a plurality of cells (1) which are electrically connected with each other; the method is characterized in that: the batteries (1) are respectively provided with a metal lead structure, and the metal lead structures on two adjacent batteries (1) are connected in series through a conductive connecting piece (3) to form a current transmission loop; the metal wire structure comprises a front metal grid (21) arranged on the front side of the battery (1) and a back metal grid (22) arranged on the back side of the battery (1), wherein the front metal grid (21) at least comprises a front connection main grid (211), and the back metal grid (22) at least comprises a back connection main grid (221); one end of the conductive connecting piece (3) is electrically connected with the front side connecting main grid (211) of one battery (1), and the other end of the conductive connecting piece is electrically connected with the back side connecting main grid (221) of the other battery (1).

2. The connection structure according to claim 1, wherein: the front metal grid (21) comprises a front transverse fine grid (212) and a front vertical fine grid (213) which are vertically arranged, the front transverse fine grid (212) consists of 3-30 grid lines, and the front transverse fine grid is one of a continuous fine grid, an intermittent continuous fine grid and a discontinuous fine grid; the front vertical fine grid (213) consists of 60-200 grid lines.

3. The connection structure according to claim 1, wherein: the back metal grid (22) comprises a back transverse fine grid (222) and a back vertical fine grid (223) which are vertically arranged, the back transverse fine grid (222) consists of 3-30 grid lines, and the back transverse fine grid is one of a continuous fine grid, an intermittent continuous fine grid and a discontinuous fine grid; the back vertical fine grid (223) consists of 120-300 grid lines.

4. The connection structure according to claim 2 or 3, wherein: the line width of the grid line is between 10-50um, and the line height is between 3-20 um.

5. The connection structure according to claim 4, wherein: the front-surface connecting main grid (211) is parallel to the front-surface vertical fine grid (213) and is electrically connected with at least one grid line of the front-surface transverse fine grid (212); the back connection main grid (221) is parallel to the back vertical fine grid (223) and is electrically connected with at least one grid line of the back transverse fine grid (222).

6. The connection structure according to claim 5, wherein: the line widths of the front side connecting main grid (211) and the back side connecting main grid (221) are both between 200-700um, and the line height is between 3-20 um.

7. The connection structure according to claim 1, wherein: the metal lead structure is plated on the front side and the back side of the battery (1), and the plating material is nickel-copper-tin or nickel-copper-silver in sequence.

8. The connection structure according to claim 1, wherein: the conductive connecting piece (3) is made of any one of copper, copper-tin and copper-silver, and the thickness of the conductive connecting piece (3) is between 3 and 20 um.

9. The connection structure according to claim 1, wherein: the conductive connecting piece (3) comprises a conductive plate (31), and a front connecting plate (32) and a back connecting plate (33) which are integrally formed and form a Z-shaped structure are respectively arranged at two ends of the conductive plate (31); the conductive plate (31) is positioned between two adjacent batteries (1) and the height of the conductive plate is between 70 and 220 um; the front connecting plate (32) is attached to the front connecting main grid (211) of one battery (1), and the attachment width of the front connecting plate is between 200 and 700 mu m; the back connecting plate (33) is attached to the back connecting main grid (221) of the other battery (1), and the attachment width of the back connecting plate is between 200-.

10. The connection structure according to claim 1, wherein: the length of the conductive connecting piece (3) is between 150 and 220mm, and the width is between 15 and 50 mm.

Technical Field

The invention relates to the technical field of connection of photovoltaic battery pieces, in particular to a connection structure of a solar photovoltaic battery assembly.

Background

With the increasing consumption of conventional fossil energy such as global coal, oil, natural gas and the like, the ecological environment is continuously deteriorated, and particularly, the sustainable development of the human society is seriously threatened due to the increasingly severe global climate change caused by the emission of greenhouse gases. Various countries in the world make respective energy development strategies to deal with the limitation of conventional fossil energy resources and the environmental problems derived from development and utilization. The solar cell module is one of the most important renewable energy sources by virtue of the characteristics of reliability, safety, universality, long service life, environmental protection and resource sufficiency, and is expected to become a main support for global power supply in the future.

However, the development of the photovoltaic industry still faces many problems and challenges, and especially, the conversion efficiency and reliability of the solar cell module are the biggest technical obstacles restricting the development of the solar photovoltaic industry, while cost control and scale-up are economically restricted. Therefore, the continuous improvement of the conversion efficiency and weather-proof reliability of the solar cell module is a necessary trend for the development of high-efficiency solar photovoltaic modules.

At present, various high-efficiency solar photovoltaic modules are emerged on the market, such as laminated tiles, half-sheets, multi-main grids, double-sided modules and the like. With the increasingly wide application places and areas of solar photovoltaic modules, the reliability requirements of the solar photovoltaic modules are also higher, and particularly in some severe or extreme weather frequent areas, efficient and high-reliability solar photovoltaic modules are more required to be adopted.

In view of the technical development trend of the solar photovoltaic cell module at present, the solar photovoltaic cell slice manufactured by traditional silver paste printing and sintering is an industrial trend for reducing the problems of high series resistance and large current consumption generated by silver paste printing wires and manufacturing the module by slicing the solar photovoltaic cell slice in a tiling mode. The shingled assembly utilizes the electrical principle of low current and low loss (the power loss of the photovoltaic assembly is in a direct proportional relation with the square of the working current) so as to greatly reduce the power loss of the assembly. However, the laminated assembly uses the conductive adhesive with the elastomer property to replace the conventional photovoltaic metal solder strip for the assembly, and the battery assembly connected by the conductive adhesive is prone to have a void or a void in the process of performing dispensing, so after being packaged, the laminated assembly is subjected to environmental erosion in outdoor practical use, for example, high and low temperature alternation expansion and contraction generates relative displacement between the conductive adhesives, especially, under the dynamic environment of high and low temperature alternation (load action of natural world such as wind, snow and the like), the current virtual connection or even disconnection is caused most seriously, and the main reason is generally caused by weak connection capability between the materials after being combined. The weak connection capability mainly shows that a process operation window is needed for the operation of the conductive adhesive in the manufacturing process, and the window is relatively narrow in the actual production process and is very easily influenced by environmental factors, such as the temperature and humidity of an operation place, the time for which the conductive adhesive stays in the air after being coated and the like, so that the conductive adhesive loses activity. Meanwhile, the phenomenon of uneven sizing and missing easily occurs under the conditions of glue dispensing, glue spraying or printing process due to the characteristic change of glue, and great hidden danger is caused to the reliability of products. And secondly, the conductive adhesive is mainly composed of high polymer resin and a large amount of noble metal powder, so that the cost is high, and the ecological environment is damaged to a certain extent (the production and processing of noble metals have great pollution to the environment). Moreover, the conductive adhesive belongs to a paste, has certain fluidity in the process of gluing or laminating, and is very easy to overflow to cause short circuit of the positive electrode and the negative electrode of the laminated interconnected battery string. Therefore, the weatherability, the reliability and the stability of the power generation of the laminated assembly packaged by the cut crystalline silicon battery chips are doubtful by adopting the conductive adhesive of the elastomer. For most of laminated tile assemblies manufactured by adopting a conductive adhesive bonding mode, the characteristics of weak mutual connection strength exist generally, the requirement of the manufacturing process on the environment is high, the process is easy to overflow and short-circuit, the use cost is high, the production efficiency is low and the like.

Disclosure of Invention

In order to overcome the defects, the invention aims to provide a connecting structure of a solar photovoltaic cell module, which can effectively form reliable electric connection between solar photovoltaic cells, simplifies the process, reduces the production cost and further improves the production yield and the product reliability of the solar photovoltaic cell module.

In order to achieve the above purposes, the invention adopts the technical scheme that: a connecting structure of a solar photovoltaic cell module comprises a plurality of cells which are electrically connected with each other. All be equipped with the metal wire structure on the battery, adjacent two the metal wire structure on the battery all connects in series so as to form the current transport return circuit through electrically conductive connecting piece. The metal wire structure comprises a front metal grid arranged on the front side of the battery and a back metal grid arranged on the back side of the battery, the front metal grid at least comprises a front connection main grid, and the back metal grid at least comprises a back connection main grid. One end of the conductive connecting piece is electrically connected with the front side connecting main grid of one battery, and the other end of the conductive connecting piece is electrically connected with the back side connecting main grid of the other battery.

The invention has the beneficial effects that: through the arrangement of the metal lead structure and the conductive connecting piece, a good electric contact path between the cells can be effectively formed, and the situation that the cells need to be sliced due to too high series impedance and a tile-overlapping dispensing mode is adopted to manufacture a solar photovoltaic cell module is avoided; meanwhile, the front side connection main grid and the back side connection main grid are connected through the conductive connecting piece, so that direct contact connection between the positive electrode and the negative electrode between the two batteries can be realized without depending on the conductivity of a binder. The connecting structure is beneficial to simplifying the production process, reducing the fragment loss of the cell caused by slicing, saving the cost of the silver adhesive dispensing material and further improving the overall production yield and the product reliability of the solar photovoltaic cell module.

Further, the front metal grid comprises a front transverse fine grid and a front vertical fine grid which are vertically arranged, the front transverse fine grid consists of 3-30 grid lines, and the front transverse fine grid is one of a continuous fine grid, an intermittent continuous fine grid and a discontinuous fine grid; the front vertical fine grid consists of 60-200 grid lines. A plurality of grid intersections between the front-side transverse fine grids and the front-side vertical fine grids are used as electric contact connection points, so that the front side of the battery is ensured to be uniformly and well electrically contacted.

Further, the back metal grid comprises a back transverse fine grid and a back vertical fine grid which are vertically arranged, the back transverse fine grid consists of 3-30 grid lines, and the back transverse fine grid is one of a continuous fine grid, an intermittent continuous fine grid and a discontinuous fine grid; the back vertical fine grid consists of 120-300 grid lines. A plurality of grid intersections between the back transverse fine grids and the back vertical fine grids are used as electric contact connection points, so that the back of the battery is ensured to be uniformly and well electrically contacted.

Further, the line width of the grid line is between 10-50um, and the line height is between 3-20 um.

Further, the front-side connecting main grid is parallel to the front-side vertical fine grid and is electrically connected with at least one grid line of the front-side transverse fine grid. The back connection main grid is parallel to the back vertical fine grid and is electrically connected with at least one grid line of the back transverse fine grid. The electric connection between the front vertical fine grid and the front transverse fine grid and the conductive connecting piece is realized by connecting the front main grid with the front surface, the electric connection between the back vertical fine grid and the back transverse fine grid and the conductive connecting piece is realized by connecting the back main grid with the back surface, and then the series connection of the front surface and the back surface of two adjacent batteries is realized.

Further, the line widths of the front side connection main gate and the back side connection main gate are both between 200-700um, and the line heights are both between 3-20 um.

Further, the metal wire structure is plated on the front side and the back side of the battery, and the plating material is nickel-copper-tin or nickel-copper-silver in sequence. The nickel-plated layer is used as an electroplating bottom layer, and forms silicon-nickel alloy with the battery substrate silicon after high-temperature sintering, so that the contact resistance is effectively reduced, the adhesive force of the metal wire structure is enhanced, and meanwhile, the nickel metal layer is also a good barrier layer, so that the copper migration and diffusion of the subsequent copper-plated layer can be effectively isolated; the electroplated copper layer is used as a carrier for collecting and transmitting the current of the battery, so that the series resistance can be effectively reduced, the loss is reduced, and the transmission efficiency of the current is improved; therefore, when the solar photovoltaic module is manufactured subsequently, the front side connecting main grids and the back side connecting main grids among the cells can be directly connected in series through the conductive connecting pieces without slicing the cell slices; after the copper electroplating layer is formed, a tin or silver electroplating layer is then performed to protect the surface of the copper electroplating layer from oxidation to form a copper oxide layer.

Further, the conductive connecting piece is made of any one of copper, copper-tin and copper-silver, and the thickness of the conductive connecting piece is between 3 and 20 um. The conductive connecting piece matched with the metal wire structure material enables the conductive connecting piece to be quickly and tightly combined with the front connection main grid and the back connection main grid through a hot pressing process, and the series connection manufacturing process between the batteries is simply and quickly realized.

Furthermore, the conductive connecting piece comprises a conductive plate, and a front connecting plate and a back connecting plate which are integrally formed and form a Z-shaped structure are respectively arranged at two ends of the conductive plate. The conductive plate is positioned between two adjacent batteries and the height of the conductive plate is between 70 and 220 um. The front connecting plate is attached to the front connecting main grid of one battery, and the attachment width of the front connecting plate is between 200 and 700 mu m. The back connecting plate is attached to the back connecting main grid of the other battery, and the attachment width of the back connecting plate is between 200 and 700 microns.

Further, the length of the conductive connecting element is between 150 and 220mm, and the width is between 15 and 50 mm.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the front side of a battery according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the structure of the back side of a battery according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a conductive connection component according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a front lateral fine grid according to an embodiment of the present invention, wherein the front lateral fine grid is a continuous fine grid;

FIG. 6 is a schematic structural diagram of a front lateral fine grid according to an embodiment of the present invention, wherein the front lateral fine grid is an intermittent continuous fine grid;

FIG. 7 is a schematic structural diagram of a front lateral fine grid according to an embodiment of the present invention, wherein the front lateral fine grid is an intermittent continuous fine grid;

fig. 8 is a schematic structural diagram of the front lateral fine grid of the embodiment of the invention when the front lateral fine grid is a discontinuous fine grid.

In the figure:

1-a battery; 21-front metal grid; 211-front side connecting main grid; 212-front lateral fine grid; 213-front vertical fine grid; 22-back metal grid; 221-back side connection main grid; 222-backside lateral fine gate; 223-back vertical fine grid; 3-a conductive connection; 31-a conductive plate; 32-a front connection plate; 33-back connection plate; 41-continuous grid lines; 42-interrupted grid lines.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.