CN217641367U - Connection mode of tin alloy main grid line electrode photovoltaic cell - Google Patents
Connection mode of tin alloy main grid line electrode photovoltaic cell Download PDFInfo
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- CN217641367U CN217641367U CN202221885431.7U CN202221885431U CN217641367U CN 217641367 U CN217641367 U CN 217641367U CN 202221885431 U CN202221885431 U CN 202221885431U CN 217641367 U CN217641367 U CN 217641367U
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Abstract
The application relates to a connection mode of a tin alloy main grid line electrode photovoltaic cell, which comprises the following steps: the battery piece unit is provided with at least two battery piece units which are sequentially stacked, each battery piece unit comprises a front surface and a back surface which are oppositely arranged, and at least part of the front surface of one of the two adjacent battery piece units is overlapped with at least part of the back surface of the other battery piece unit; the main grid line electrode is made of a tin alloy material and comprises a front tin alloy main grid line electrode arranged on the front side of the cell unit and a back tin alloy main grid line electrode arranged on the back side of the cell unit; the front tin alloy main grid line electrode of one of the two adjacent cell sheet units is overlapped with the back tin alloy main grid line electrode of the other cell sheet unit; and the front tin alloy main grid line electrode of one of the two adjacent cell sheet units is connected with the back tin alloy main grid line electrode of the other cell sheet unit in a melting way, so that the two cell sheet units are electrically connected in series.
Description
Technical Field
The utility model relates to a tin alloy main grid line electrode photovoltaic cell's connected mode belongs to solar cell technical field.
Background
Solar energy is renewable energy which is inexhaustible and is clean energy, and no environmental pollution is generated. Among the effective utilization of solar energy, solar photovoltaic utilization is the fastest and most active research field in recent years, and therefore, photovoltaic cells are developed and developed.
In order to further improve the conversion efficiency of the photovoltaic module, in the prior art, a battery piece is generally cut into a plurality of battery pieces with the same size, then the battery pieces are connected to form a battery string, and then the cut battery pieces are connected in series to form the battery string, so that the process gap between the battery pieces in the module is eliminated, the photoelectric conversion efficiency of the photovoltaic module is improved, and the power generation cost is reduced.
However, since the main grid line electrodes of the photovoltaic cell are made of silver paste materials at present, the manufacturing cost is high, and physical connection cannot be directly formed between the main grid line electrodes made of silver paste, in the prior art, the main grid line electrodes made of silver paste of two adjacent cell pieces can be connected only by a special conductive medium such as conductive adhesive, or a solder strip, or other conductive media, so that electrical and physical connection between the two cell pieces is completed, the manufacturing process is complex, and the connection cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a through the direct melting of the main grid line electrode by the preparation of tin alloy that sets up on the battery piece unit, form the connected mode that does not need any other conducting medium between the battery piece unit, form low cost, high reliability, the connection preparation technology between the photovoltaic cell of high subassembly conversion efficiency.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a connection mode of a tin alloy main grid line electrode photovoltaic cell comprises the following steps:
the battery piece unit is provided with at least two battery piece units which are sequentially stacked, each battery piece unit comprises a front surface and a back surface which are oppositely arranged, and at least part of the front surface of one of the two adjacent battery piece units is overlapped with at least part of the back surface of the other battery piece unit; and
the main grid line electrode is made of a tin alloy material and comprises a front tin alloy main grid line electrode arranged on the front side of the cell unit and a back tin alloy main grid line electrode arranged on the back side of the cell unit;
the front tin alloy main grid line electrode of one of the two adjacent cell units is overlapped with the back tin alloy main grid line electrode of the other cell unit; and the front tin alloy main grid line electrode of one of the two adjacent cell units is connected with the back tin alloy main grid line electrode of the other cell unit in a melting way, so that the two cell units are electrically connected in series.
Furthermore, the photovoltaic cell comprises a cell, the cell is cut into at least two cell units, the at least two cut cell units are sequentially stacked, and the front tin alloy main grid line of one cell unit of two adjacent cell units is overlapped with the back tin alloy main grid line of the other cell unit.
Further, the photovoltaic cell is a P-type crystalline silicon photovoltaic cell or an N-type crystalline silicon photovoltaic cell or a heterojunction photovoltaic cell with a main grid electrode made of tin alloy.
Furthermore, the number of the front-side tin alloy main grid line electrode and the number of the back-side tin alloy main grid line electrodes on each cell unit are both one, and the front-side tin alloy main grid line electrode and the back-side tin alloy main grid line electrode are arranged close to the edges of the cell units.
Further, the front-surface tin alloy main grid line electrode and the back-surface tin alloy main grid line electrode on each cell unit are parallel to each other, and projections of the front-surface tin alloy main grid line electrode and the back-surface tin alloy main grid line electrode are not overlapped.
Further, the front-side tin alloy main grid electrode and the back-side tin alloy main grid electrode are parallel to the edge of the cell unit.
Furthermore, the cell unit is rectangular, and the front tin alloy main grid line electrode and the back tin alloy main grid line electrode are arranged close to the long edges of the cell unit.
Further, the tin alloy material is a tin-bismuth alloy, and the melting point of the tin-bismuth alloy is lower than 220 ℃.
Furthermore, one or more metals of silver, titanium, cerium and gallium are added into the tin-bismuth alloy.
Further, the front tin alloy main grid line electrode of one of the two adjacent cell units and the back tin alloy main grid line electrode of the other cell unit are heated to be molten, and pressure is applied to the two cell units so that the front tin alloy main grid line electrode and the back tin alloy main grid line electrode corresponding to the front tin alloy main grid line electrode are fused to enable the two cell units to be connected in a melting mode.
The beneficial effects of the utility model reside in that: according to the photovoltaic cell, the tin alloy material is adopted to manufacture the main grid line electrode of the cell unit of the photovoltaic cell, so that the front tin alloy main grid line electrode of one of the two adjacent cell units and the back tin alloy main grid line electrode of the other cell unit can be directly connected in a melting mode, and physical connection and electrical connection are formed between the two cell units.
Compared with the prior art, the method has the advantages that (1) the tin alloy material is adopted to replace a silver paste material to manufacture the main grid electrode, so that the preparation cost of the photovoltaic cell is reduced. (2) When two adjacent photovoltaic cell units are connected, the connection between the photovoltaic cells is completed without depending on conductive adhesive, or solder strips or other conductive media, so that the process difficulty of the connection between the photovoltaic cell units is reduced, and meanwhile, the connection cost between the photovoltaic cell units is reduced. (3) Because the homogeneous melting of the main grid line electrode of tin alloy material preparation between the battery piece unit is connected, the bonding force that relies on the organic matter to provide than conductive adhesive and silver thick liquid system main grid line electrode, or the welding pulling force that tin-plating and silver thick liquid system main grid line electrode relied on the metal to permeate the layer formation outside the solder strip provides more reliable connection.
The above description is only an outline of the technical solution of the present invention, and in order to make the technical means of the present invention more clear and to be implemented in accordance with the content of the specification, the following detailed description will be made with reference to the preferred embodiments of the present invention in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of two connected battery cell units according to an embodiment of the present invention;
fig. 2 is a schematic front view of the battery cell shown in fig. 1.
Description of the drawings:
1-a cell unit; 11-front side; 12-back side; 2-front tin alloy main grid line electrode; 3-back tin alloy main grid electrode.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In this application, where the contrary is not intended, directional words such as "upper, lower, top and bottom" are generally used with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, vertical or gravitational direction; similarly, "inner and outer" refer to inner and outer relative to the profile of the components themselves for ease of understanding and description, but the above directional terms are not intended to limit the present application.
The photovoltaic cell is a solar cell, is a photoelectric semiconductor sheet which directly generates electricity by utilizing sunlight, is also called as a solar chip or a photovoltaic cell, can output voltage instantly and generate current under the condition of a loop as long as the illuminance of a certain illuminance condition is met, and is physically called as solar photovoltaic for short.
The photovoltaic cell works on the principle of utilizing the photovoltaic effect of a PN junction formed inside a semiconductor material, under the irradiation of sunlight, some specific semiconductors generate free charges inside, and the free charges directionally move and accumulate to generate certain electromotive force, so as to supply current to an external circuit, and the phenomenon is called photovoltaic effect or photovoltaic effect. In order to improve the photoelectric conversion efficiency of the photovoltaic cell, a plurality of cell units are sequentially connected to form a cell string.
Referring to fig. 1 and fig. 2, in order to reduce the connection cost and the connection process difficulty between the cell units 1, the present embodiment provides a connection method for a tin alloy main grid electrode photovoltaic cell. The connection mode is suitable for manufacturing a P-type crystalline silicon photovoltaic cell of the main grid electrode, or an N-type crystalline silicon photovoltaic cell, or a heterojunction photovoltaic cell by using a tin alloy material. The application does not specifically limit the types of the photovoltaic cells, and can be adjusted by combining design requirements.
The photovoltaic cell adopting the connection mode comprises at least two cell units 1 which are sequentially stacked and a main grid electrode arranged on each cell unit 1. Wherein the main grid electrode is made of a tin alloy material.
Specifically, each cell unit 1 comprises a front surface 11 and a back surface 12 which are oppositely arranged, and the front surface 11 of each cell unit 1 is uniformly oriented. At least part of the front surface 11 of one of the two adjacent cell sheet units 1 is overlapped with at least part of the back surface 12 of the other cell sheet unit 1. A front tin alloy bus bar electrode 2 is arranged on the front surface 11, and a back tin alloy bus bar electrode 3 is arranged on the back surface 12. The front tin alloy main grid line electrode 2 on one of the two adjacent cell sheet units 1 is overlapped with the back tin alloy main grid line electrode 3 on the other cell sheet unit 1, so that the front tin alloy main grid line electrode 2 of one of the two adjacent cell sheet units and the back tin alloy main grid line electrode 3 of the other cell sheet unit can be directly connected in a melting manner, and the two adjacent cell sheet units 1 are connected and fixed.
It should be noted that the above-mentioned battery sheet unit 1 may be formed by a production line to produce and prepare the battery sheet unit in a unified manner, or may be formed by cutting a battery sheet to form a plurality of battery sheet units 1 with the same size. The present application does not specifically limit the manner of forming the battery cell 1.
As mentioned above, two adjacent cell units 1 are connected by melting tin alloy main grid line electrodes. The fusion connection is a conventional physical connection manner in the prior art, and specifically refers to a connection manner in which metal and metal, or metal and alloy, or alloy and alloy are fused after being heated to a (liquid) melting point.
Taking this embodiment as an example, the fusion connection of the two adjacent battery sheet units 1 through the bus bar electrodes specifically includes: the front tin alloy main grid line electrode 2 of one cell unit 1 and the back tin alloy main grid line electrode 3 of the other cell unit 1 are overlapped by being placed and superposed, then the front tin alloy main grid line electrode 2 and the back tin alloy main grid line electrode 3 corresponding to the front tin alloy main grid line electrode 2 are melted by high temperature, then pressure is applied to the two cell units 1, so that the melted front tin alloy main grid line electrode 2 and the back tin alloy main grid line electrode 3 corresponding to the front tin alloy main grid line electrode 2 are fused together, and after cooling, the front tin alloy main grid line electrode 2 of one of the two cell units 1 and the back tin alloy main grid line electrode 3 of the other cell unit 1 are fused and fixed, so that physical connection and electrical connection of the two cell units 1 are realized.
According to the foregoing, adjacent two battery cell units 1 are sequentially stacked to overlap the positions of the tin alloy main grid line electrodes, and the melting connection of the tin alloy main grid line electrodes between the two battery cells is completed by heating the tin alloy main grid line electrodes, in order to facilitate the connection and fixation of the adjacent two battery cell units 1 and improve the photoelectric conversion efficiency of the assembly, the number of the front tin alloy main grid line electrodes 2 and the number of the back tin alloy main grid line electrodes 3 on each battery cell unit 1 are both one, and the front tin alloy main grid line electrodes 2 and the back tin alloy main grid line electrodes 3 are arranged near the edges of the battery cell units 1.
Through the structure, when the two cell units 1 are connected in a melting mode, the overlapped parts are the edge positions of the two cell units 1, so that the area of the two cell units 1 shielded mutually can be reduced during connection, the light receiving area of the cell units 1 is increased, and the photoelectric conversion efficiency is improved.
In order to realize that a plurality of battery piece units 1 are sequentially stacked and fused, the front tin alloy bus bar electrodes 2 and the back tin alloy bus bar electrodes 3 on each battery piece unit 1 are parallel to each other, and the projections of the front tin alloy bus bar electrodes and the back tin alloy bus bar electrodes are not overlapped.
Specifically, as shown in fig. 2, in the front view direction of the cell sheet unit 1, the front tin alloy busbar electrode 2 of the cell sheet unit 1 is disposed on the front 11 of the cell sheet unit 1 and near the left edge of the front 11, and the back tin alloy busbar electrode 3 of the cell sheet unit 1 is disposed on the back 12 of the cell sheet unit 1 and near the right edge of the back 12, so that the plurality of cell sheet units 1 are in a stepped structure after being fused and connected.
In order to improve the structural stability and compactness after the plurality of battery sheet units 1 are connected, the front tin alloy main grid line electrodes 2 and the back tin alloy main grid line electrodes 3 are parallel to the edges of the battery sheet units 1. The front tin alloy main grid line electrode 2 and the back tin alloy main grid line electrode 3 are arranged to be parallel to the edges of the battery piece units 1, so that the structure of the battery piece units 1 after being connected is more integrated, and subsequent packaging and use are facilitated.
In order to further improve the photoelectric conversion efficiency of the photovoltaic module formed by the battery, in this embodiment, the battery sheet unit 1 is rectangular, and the front-side tin alloy main grid line electrodes 2 and the back-side tin alloy main grid line electrodes 3 are disposed close to the long edges of the battery sheet unit 1.
Through setting up cell piece unit 1 to rectangle structure, the photic area that can make full use of cell piece unit 1 avoids cell piece unit 1 to connect the back, forms the space between two cell piece units 1, simultaneously with front tin alloy owner grid line electrode 2 and back tin alloy owner grid line electrode 3 be close to the long limit setting of rectangle cell piece unit 1, avoids the length overlength after a plurality of cell pieces melting are connected to in follow-up encapsulation and use. Indeed, in other embodiments, the battery sheet unit 1 may be configured in other shapes, which is not limited in this application.
It should be noted that the tin alloy material is specifically a tin-bismuth alloy, and the melting point of the tin-bismuth alloy is lower than 220 ℃. The tin bismuth alloy is a known alloy in the prior art, belongs to an environment-friendly alloy, is solid and silvery white at normal temperature, and has strong permeability, and the melting point of the tin bismuth alloy is determined by different proportions of tin and bismuth. The preparation method, the preparation principle and the physical properties are all common knowledge in the field and are not described herein.
The melting point of the tin-bismuth alloy is lower than 220 ℃, so that the cell unit 1 does not need to be in a high-temperature environment when a main grid electrode is prepared or fused for connection, and the cell unit 1 can be prevented from deforming, hidden cracking, deforming and even scrapping due to high temperature, so that the thickness of the cell unit can be further reduced, the utilization rate of a cell is improved, the development of a sheet cell is facilitated, and the cost of a silicon wafer is reduced.
In order to further improve the welding activity of the front tin alloy main grid line electrode 2 and the back tin alloy main grid line electrode 3 with the surface of the battery and improve the drawing force of the front tin alloy main grid line electrode 2 and the back tin alloy main grid line electrode 3 with the surface of the battery, one or more metals of silver, titanium, cerium and gallium are also added into the tin-bismuth alloy. The metal silver, titanium, cerium and gallium are known metal materials in the prior art, and the metal silver, the metal titanium, the metal cerium, the metal gallium and the tin bismuth alloy are only physically fused and do not generate chemical reaction with each other. The physical properties of the metals silver, titanium, cerium and gallium are common knowledge in the art and are not elaborated on here.
Compared with the prior art, the main grid line electrode of the photovoltaic cell is manufactured by adopting the tin alloy material to replace a silver paste material, so that the manufacturing cost of the photovoltaic cell is reduced. The front tin alloy main grid line electrode 2 of one of the two adjacent cell sheet units 1 and the back tin alloy main grid line electrode 3 of the other cell sheet unit 1 adopt a direct fusion connection mode, so that the two cell sheet units 1 are fixedly connected and electrically connected, the connection structure is more stable, the situation that conductive adhesive is added between the main grid line electrodes made of silver paste materials of the two cell sheet units 1 in the past or solder strips or other conductive media can only be used for completing the connection between photovoltaic cell sheets is avoided, the connection process is simpler
In this way, since the conductive medium between the front tin alloy main grid line electrode 2 of one of the two connected cell units 1 and the back tin alloy main grid line electrode 3 of the other cell unit 1 is completely eliminated, the process difficulty of connection between the cell units 1 is reduced, and the connection cost between the cell units 1 is also greatly reduced.
It is to be understood that the above-described embodiments are only a few embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, those skilled in the art may make other changes or modifications without creative efforts, and all should fall within the protection scope of the present application.
Claims (10)
1. A tin alloy main grid line electrode photovoltaic cell connection mode is characterized by comprising:
the battery piece unit is provided with at least two battery piece units which are sequentially stacked, each battery piece unit comprises a front surface and a back surface which are oppositely arranged, and at least part of the front surface of one of the two adjacent battery piece units is overlapped with at least part of the back surface of the other battery piece unit; and
the main grid line electrode is made of a tin alloy material and comprises a front tin alloy main grid line electrode arranged on the front side of the cell unit and a back tin alloy main grid line electrode arranged on the back side of the cell unit;
the front tin alloy main grid line electrode of one of the two adjacent cell units is overlapped with the back tin alloy main grid line electrode of the other cell unit; and the front tin alloy main grid line electrode of one of the two adjacent cell units is connected with the back tin alloy main grid line electrode of the other cell unit in a melting way, so that the two cell units are electrically connected in series.
2. The method for connecting a tin alloy main grid line electrode photovoltaic cell as claimed in claim 1, wherein the photovoltaic cell comprises a cell, the cell is cut to form at least two cell units, the at least two cut cell units are sequentially stacked, and the front tin alloy main grid line of one cell unit of two adjacent cell units is overlapped with the back tin alloy main grid line electrode of the other cell unit.
3. The method for connecting a tin alloy busbar electrode photovoltaic cell as claimed in claim 1 or 2, wherein the photovoltaic cell is a P-type crystalline silicon photovoltaic cell or an N-type crystalline silicon photovoltaic cell or a heterojunction photovoltaic cell in which the busbar electrode is made of tin alloy.
4. The connection mode of the tin alloy main grid line electrode photovoltaic cell as claimed in claim 1, wherein the number of the front tin alloy main grid line electrode and the number of the back tin alloy main grid line electrode on each cell unit are both one, and the front tin alloy main grid line electrode and the back tin alloy main grid line electrode are arranged close to the edge of the cell unit.
5. The connection mode of the tin alloy main grid electrode photovoltaic cell as claimed in claim 4, wherein the front tin alloy main grid electrode and the back tin alloy main grid electrode on each cell unit are parallel to each other and have non-overlapping projections.
6. The method of claim 5, wherein the front side tin alloy main grid electrode and the back side tin alloy main grid electrode are parallel to edges of the cell units.
7. The connection mode of the tin alloy busbar electrode photovoltaic cell of claim 6, wherein the cell unit is rectangular, and the front tin alloy busbar electrode and the back tin alloy busbar electrode are arranged close to the long edge of the cell unit.
8. The method of claim 1, wherein the tin alloy material is a tin bismuth alloy, and the melting point of the tin bismuth alloy is less than 220 ℃.
9. The connection mode of the tin alloy main grid line electrode photovoltaic cell as claimed in claim 8, wherein one or more metals of silver, titanium, cerium and gallium are added in the tin bismuth alloy.
10. The method according to claim 1, wherein the front-side tin alloy busbar electrode of one of the two adjacent cell units and the back-side tin alloy busbar electrode of the other cell unit are heated to melt, and pressure is applied to the two cell units to fuse the front-side tin alloy busbar electrode and the back-side tin alloy busbar electrode corresponding to the front-side tin alloy busbar electrode, so that the two cell units are melt-connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221885431.7U CN217641367U (en) | 2022-07-21 | 2022-07-21 | Connection mode of tin alloy main grid line electrode photovoltaic cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221885431.7U CN217641367U (en) | 2022-07-21 | 2022-07-21 | Connection mode of tin alloy main grid line electrode photovoltaic cell |
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| Publication Number | Publication Date |
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| CN217641367U true CN217641367U (en) | 2022-10-21 |
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| CN202221885431.7U Active CN217641367U (en) | 2022-07-21 | 2022-07-21 | Connection mode of tin alloy main grid line electrode photovoltaic cell |
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