CN105932084A - Solar battery pack and preparation method thereof - Google Patents

Abstract

The invention relates to a solar battery component and a preparation method thereof. The above-mentioned solar battery module includes a battery pack, and the battery pack includes several connected battery slices, and the battery slices are arranged in rows and columns; in the row direction, two adjacent battery slices are overlapped and connected in series using connectors; in the column direction , two adjacent cells are connected in parallel through connectors. In the above solar cell components, not only the conversion efficiency of the solar cell components can be improved. At the same time, the cells are electrically connected to adjacent cells. Therefore, each cell in the solar cell module of the present invention is an independent unit, even if a cell is broken or phased due to physical or elastic changes. Two adjacent battery slices are separated, and the current can flow to the adjacent battery slices connected in parallel without causing adverse effects on the remaining battery slices, which is beneficial to reduce the power loss of the entire solar cell module. In addition, a method for preparing the above solar cell module is also provided.

Description

Solar cell module and preparation method thereof

technical field

The invention relates to the technical field of solar cells, in particular to a solar cell component and a preparation method thereof.

Background technique

As a new energy source, solar energy has the advantages of being inexhaustible, clean and environmentally friendly compared with traditional fossil fuels. At present, the main solar energy utilization method is to convert the received light energy into electrical energy output through solar cell components. The traditional solar cell component is formed by connecting several solar cells (or photovoltaic cells) in series and then packaging them in a square array. large-area battery components. Among them, the solar cell sheet absorbs light energy, and the accumulation of charges of opposite signs occurs at both ends of the battery, which generates "photovoltaic voltage", which is the "photovoltaic effect". Under the action of the photovoltaic effect, the two ends of the solar cell generate electromotive force Thereby converting light energy into electrical energy.

A traditional solar cell module usually includes several battery strings, and each battery string includes several solar cell slices connected in series. However, during the use of the above-mentioned solar cell components, due to physical or elastic changes, the solar cells are likely to break or two adjacent solar cells are separated, and the circuit of the battery string where it is located is interrupted, resulting in failure, resulting in the entire Power loss in solar modules.

Contents of the invention

Based on this, it is necessary to provide a solar cell assembly with reduced power loss to address the problem of power loss in traditional solar cell assemblies.

A solar cell assembly, including a battery pack, the battery pack includes several connected battery slices, and the battery slices are arranged in rows and columns;

In the row direction, two adjacent battery sheets are overlapped and connected in series using connectors;

In the column direction, two adjacent battery slices are connected in parallel through the connecting piece.

In the above solar battery module, two adjacent battery pieces are overlapped and connected in series by using connectors, which can improve the conversion efficiency of the solar battery module. At the same time, since the battery sheet is electrically connected to the adjacent battery sheet, compared with the traditional solar cell assembly, each battery sheet in the solar cell assembly of the present invention is an independent unit, even if due to physical or elastic The change of a certain cell breaks or two adjacent cells are separated, and the current can flow to the adjacent and parallel cell without adversely affecting the rest of the cells, which is conducive to reducing the overall solar cell module. power loss.

In one embodiment, the cell sheet is a cut cell sheet, and the cell cut sheet is cut from a solar cell sheet.

In one of the embodiments, all the battery slices in the same column share the connecting member.

In one embodiment, all the battery slices in the same column are located on the same side of the connecting member.

In one embodiment, the connecting piece is in the form of a sheet, and hollow holes are provided inside the connecting piece for communicating with the two sides of the connecting piece.

In one embodiment, the connecting piece is in the shape of a long strip, and a plurality of notches arranged at intervals are provided at the edge of the long side of the connecting piece, and the notches are not communicated with the hollow hole.

In one of the embodiments, the battery sheet includes a front electrode and a back electrode;

The connector includes a first surface connected to the front electrode and a second surface connected to the back electrode, the first surface is provided with alternately arranged first connection regions and first non-connection regions, so The second surface is provided with alternately connected second connection regions and second non-connection regions, and the projected area of the first non-connection regions on the first surface is greater than or equal to that of the second connection regions on the first surface. the projected area on the first surface;

The front electrode is connected to the first connection area, and the back electrode is connected to the second connection area.

In one of the embodiments, the projection of the first connection area on the first surface is a first projection, the projection of the second connection area on the first surface is a second projection, and the first projection The distance between the adjacent second projections is 1 mm to 20 mm.

In one of the embodiments, both the front electrode and the back electrode extend along the length direction of the battery sheet, and the first non-connection area and the second non-connection area are respectively provided with a first barrier solder layer and a second barrier solder layer.

In one embodiment, both the front electrode and the back electrode extend along the length direction of the battery sheet, and the front electrode is provided with alternately arranged third connection regions and third non-connection regions, the Alternately arranged fourth connection regions and fourth non-connection regions are arranged on the back electrode;

The third connection area is connected to the first connection area, the fourth connection area is connected to the second connection area, and the third non-connection area and the fourth non-connection area are respectively provided with the first Three barrier solder layers and a fourth barrier solder layer.

In addition, a method for preparing a solar cell module is also provided, comprising the steps of:

Provide several battery slices and several connectors;

Connecting the plurality of battery slices with the plurality of connectors to obtain a battery pack, in which the battery slices are arranged in rows and columns; in the row direction, two adjacent batteries The sheets are overlapped and connected in series by connecting pieces; in the column direction, two adjacent battery sheets are connected in parallel through the connecting pieces.

In the solar cell assembly obtained by the preparation method of the above solar cell assembly, since the cell sheet is electrically connected to the adjacent cell sheet, compared with the traditional solar cell assembly, each solar cell assembly of the present invention Each cell is an independent unit. Even if a cell is broken or two adjacent cells are separated due to physical or elastic changes, the current can flow to the adjacent and parallel cell without affecting the rest of the cells. The adverse effects caused by the chips are beneficial to reduce the power loss of the entire solar cell module.

In one of the embodiments, the operation of connecting the several battery slices to the several connectors is as follows:

A plurality of battery sheets are arranged in a row to obtain a battery row, and then the connecting member and the battery row are alternately connected.

Description of drawings

1 is a schematic front view of a solar cell module according to an embodiment;

Fig. 2 is a circuit diagram of a solar cell assembly of an embodiment;

Fig. 3 is a schematic diagram of the light-facing surface of a battery sheet according to an embodiment;

FIG. 4 is a schematic diagram of a backlight surface of a battery sheet according to an embodiment;

5 is a schematic diagram of a connector in an embodiment;

6 is a schematic diagram of a connector in another embodiment;

FIG. 7 is a schematic diagram of a series connection between adjacent battery sheets in the row direction according to an embodiment;

Fig. 8 is a schematic diagram of parallel connection between adjacent cells in the column direction according to an embodiment;

FIG. 9 is a schematic diagram of the light-facing surface of a battery sheet in another embodiment;

Fig. 10 is a schematic diagram of a backlight surface of a battery sheet in another embodiment;

Fig. 11 is a schematic diagram of series connection between adjacent battery sheets in the row direction in another embodiment;

Fig. 12 is a schematic side view of a connector in another embodiment;

FIG. 13 is a schematic diagram of projections of the first connection area and the second connection area on the first surface, respectively, according to an embodiment;

14 is a schematic side view of a front electrode, a connector, and a back electrode of an adjacent battery cut sheet according to another embodiment;

Fig. 15 is a flow chart of a method for manufacturing a solar cell module according to an embodiment.

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

Referring to FIG. 1 and FIG. 2 , a solar cell assembly 100 in one embodiment includes two battery packs 110 connected in series. Each battery pack 110 includes 33*6 connected battery slices 112 . The battery sheets 112 are arranged in rows and columns.

Specifically, in the row direction, two adjacent battery slices 112 are overlapped and connected in series using connectors. In the column direction, two adjacent battery slices 112 are connected in parallel through the connecting piece. As shown in FIG. 1 , in the battery pack 110 , 33 battery slices 112 are overlapped and connected in series in each row, and 6 battery slices 112 are connected in parallel in each column.

The cell sheet 112 in this embodiment is a cell cut sheet, specifically, it is formed by cutting the solar cell sheet into five equal parts. It should be noted that, the present invention is not limited to the above-mentioned quintuplet cutting, and the solar cells can also be cut into any equal or unequal cuts to obtain several cell cut sheets, and a suitable cell cut sheet can be selected for typesetting, and the After series-parallel connection, the solar battery module of the present invention is obtained.

It can be seen from FIG. 1 that several cells 112 with the same area in the solar cell module 100 of this embodiment are arranged neatly and closely, so that the efficiency consistency and matching of the cells 112 are better, thereby improving the efficiency of the entire solar cell. component efficiency.

Referring to FIG. 3 and FIG. 4 , the battery sheet 112 in this embodiment includes a light-facing surface for absorbing radiation and a backlight surface opposite to the light-facing surface.

As shown in FIG. 3 , seven front electrodes 114 are arranged at equal intervals along the length direction of the battery sheet 112 on the light-facing surface of the battery sheet 112 , and the front electrodes 114 are located at the long edge of the battery sheet 112 . Therefore, when two adjacent battery slices 112 in the row direction are connected in series, excessive shading of the solar light on the battery slices 112 can be avoided, thereby avoiding reduction in the utilization rate of the solar light of the solar cell module.

As shown in FIG. 4 , six back electrodes 116 arranged at equal intervals along the length direction of the battery sheet 112 are disposed on the backlight surface of the battery sheet 112 . Wherein, the projection of the back electrode 116 on the light-facing surface of the battery sheet 112 is located between the projections of two adjacent front electrodes 114 on the light-facing surface of the battery sheet 112 . In addition, in order to cooperate with the connector and make the buffer space of the connector larger, the back electrode 116 is disposed at a non-edge position of the cell sheet 112 . But it is not limited to this, and it can be set according to actual usage conditions.

Please refer to FIG. 5 , the connector 120 of this embodiment is an elastic connector, and is in the form of a sheet or a strip, which is preferably selected from any one of copper foil, aluminum foil, tinned copper foil and copper-aluminum alloy foil. Hollow holes 121 for connecting two sides of the connecting member 120 are disposed inside the connecting member 120 . The cross section of the hollow holes 121 in this embodiment is a parallelogram, and the hollow holes 121 are regularly arranged along the length direction of the connector 120, which can play a stress buffering role and reduce adverse effects of stress release on the solar cell module. Of course, the cross-section of the hollow hole 121 is not limited to the parallelogram in this embodiment, but can also be other shapes, and its position and arrangement can also be changed according to specific requirements, all of which can play the role of stress buffering.

It should be noted that the connecting piece of the present invention is not limited to the above-mentioned embodiment, in order to achieve a better stress buffering effect, in addition to providing hollow holes inside the connecting piece, notches can also be provided at the edge of the connecting piece.

Please refer to FIG. 6 , the inside of the connector 220 in another embodiment is provided with several regularly arranged hollow holes 221 , and in addition, several notches 222 arranged at intervals are provided at the edges of its long sides, and the notches 222 and Hollow holes 221 are not connected. Specifically, the notch 222 is located between two adjacent hollow holes 221 . Therefore, when the two long sides of the connecting member 220 are respectively connected to the battery sheets 112 located on both sides thereof, it can play a better role in stress buffering and reduce the adverse effects of stress release on the solar battery module.

Referring to FIG. 7 , in the solar cell module 100 , three adjacent cells 112 in the row direction are connected in series by using the connector 120 . Both ends of the long sides of the connector 120 are respectively connected to the front electrode 114 and the back electrode 116 of the cell sheet 112 . Since the front electrodes 114 and the back electrodes 116 are cross-connected, the connectors 120 are respectively cross-connected to the battery sheets 112 on both sides. In this way, a buffer space is formed between adjacent front electrodes 114 and adjacent back electrodes 116 , which can improve the flexibility of the solar cell module 100 , reduce the risk of cracking of the solar cell module 100 , and prevent grid shards from breaking.

Referring to FIG. 8 , in the solar battery module 100 , adjacent solar cells 112 in the column direction are connected in parallel by using connectors 120 . In this embodiment, all the battery slices 112 in the same row are located on the same side of the connector 120 . Since the connecting member 120 is located on the back of the battery slice 112, it will not cover the battery slice 112 to avoid loss.

In addition, in this embodiment, all the battery slices 112 in the same row share the connector 120 . Certainly, a plurality of shorter connecting pieces 120 can also be selected to connect adjacent battery slices 112 in the column direction in parallel.

It should be noted that the battery sheet and the connector of the present invention are not limited to the above-mentioned embodiments, and may also be in other forms. For example, both the front electrode and the back electrode of the battery sheet may extend along the length direction of the battery sheet, and the connecting member may be a strip-shaped welding strip without hollow holes or gaps inside.

Referring to FIG. 9 and FIG. 10 , the cell sheet 212 of the solar cell module in another embodiment includes a front electrode 214 and a back electrode 216 extending along the length direction of the cell sheet 212 . The front electrode 214 and the back electrode 216 are respectively located at edge positions of opposite ends of the cell sheet 212 .

Referring to FIG. 11 , two adjacent battery slices 212 in the row direction are overlapped and connected in series through a connecting member 300 . In this embodiment, the width of the back electrode 216 of the left cell 212 is slightly larger than the width of the front electrode 214 of the right cell 212, and the width of the connector 300 is smaller than the width of the front electrode 214 of the right cell 212, which can Avoid exposing the front electrode 214 or the connecting piece 300 when the positions of two adjacent battery pieces 212 are shifted during placement, thereby reducing the illuminated area.

Referring to FIG. 12 , the connector 300 of this embodiment includes a first surface 310 connected to the front electrode 214 and a second surface 320 connected to the back electrode 216 . Alternately arranged first connection regions 311 and first non-connection regions 312 are arranged on the first surface 310 . The front electrode 214 is connected to the first connection region 311 .

Alternately arranged second connection regions 321 and second non-connection regions 322 are arranged on the second surface 320 . The back electrode 216 is connected to the second connection region 321 .

Referring to FIG. 13 , the projection of the first connection region 311 on the first surface 310 in this embodiment is the first projection 3112 , the projection of the second connection region 321 on the first surface 310 is the second projection 3212 , and the first projection 3112 and The interval between adjacent second projections 3212 is any value between 1 mm and 20 mm. Within this interval range, a buffer zone is formed between the connection area of the front electrode 214 and the back electrode 216 to improve the flexibility of the solar cell module, reduce the risk of hidden cracks of the solar cell module, and not easily break the grid slivers. However, it is not limited thereto, and may also be intervals of other values.

As shown in FIG. 13 , the projected area of the first non-connected region 312 on the first surface 310 is larger than the projected area of the second connected region 321 on the first surface 310 .

In addition, a first barrier soldering layer 313 and a second barrier soldering layer 323 are respectively disposed on the first non-connection area 312 and the second non-connection area 322 . The first barrier welding layer 313 and the second barrier welding layer 323 in this embodiment are ink coatings. Of course, both the first barrier soldering layer 313 and the second barrier soldering layer 323 can also be other coatings that function as barrier soldering. When two adjacent battery pieces 212 are overlapped and connected in series through the connector 300, the first barrier welding layer 313 and the second barrier welding layer 323 are used for barrier welding, and also have a certain degree of elasticity, which can play a buffering role. Therefore, the elasticity of the solar cell module of this embodiment is improved, necessary elastic deformation can be achieved to resist the deformation requirements of external or internal internal stress, the risk of hidden cracks of the solar cell module is reduced, and the grid slivers are not easily broken, which is beneficial to application.

In the above embodiments, the first barrier welding layer 313 and the second barrier welding layer 323 are provided on the connector 300 for barrier welding and provide certain elasticity. It should be noted that a barrier welding layer may also be provided on the front electrode and the back electrode of the battery sheet located on both sides of the connector.

Referring to FIG. 14 , in another embodiment, the front electrode 410 of the battery sheet is provided with alternately arranged third connection regions 411 and third non-connection regions 412 . Alternately arranged fourth connection regions 421 and fourth non-connection regions 422 are arranged on the back electrode 420 . Both the third connection area 411 and the fourth connection area 421 are connected to the connection piece 430 .

A third barrier soldering layer 413 and a fourth barrier soldering layer 423 are respectively disposed on the third non-connecting area 412 and the fourth non-connecting area 422 . The third barrier welding layer 413 and the fourth barrier welding layer 423 in this embodiment are self-adhesive layers.

To sum up, in the above-mentioned solar cell assembly, since the cells are electrically connected to the adjacent cells, compared with the traditional solar cell assembly, each cell in the solar cell assembly of the present invention is As an independent unit, even if a cell is broken or two adjacent cells are separated due to physical or elastic changes, the current can flow to the adjacent and parallel cells without adversely affecting the remaining cells , which is beneficial to reduce the power loss of the whole solar cell module.

In addition, the present invention also provides a method for preparing a solar cell module, as shown in Figure 15, comprising the following steps:

S10, providing several battery slices and several connecting pieces.

S20. Connect several battery slices in step S10 with several connectors to obtain a battery pack. In the battery pack, the battery slices are arranged in rows and columns; in the row direction, two adjacent battery slices are connected by connectors Stacked in series; in the column direction, two adjacent cells are connected in parallel through connectors.

In a preferred embodiment, the operation of connecting several battery slices to several connecting parts is as follows: arranging several battery slices in rows to obtain battery rows, and then alternately connecting the connecting parts to the battery rows.

In a preferred embodiment, during the operation of alternately connecting the connectors and battery rows, the backlight of the battery slices faces upward.

In the solar cell assembly obtained by the preparation method of the above solar cell assembly, since the cell sheet is electrically connected to the adjacent cell sheet, compared with the traditional solar cell assembly, each solar cell assembly of the present invention Each cell is an independent unit. Even if a cell is broken or two adjacent cells are separated due to physical or elastic changes, the current can flow to the adjacent and parallel cell without affecting the rest of the cells. The adverse effects caused by the chips are beneficial to reduce the power loss of the entire solar cell module.

In addition, the design of the present invention also eliminates the basic concept of traditional string units, and adopts the concept of full automation of plate interconnection. The overall plate has only positive and negative electrodes, and there is no other process and operation action requirements, which improves the automation of components. Process and operation, but also fundamentally improved the production capacity of the product. It will realize the highly automated development of solar cell modules, reducing the performance and quality risks caused by manual intervention. Increase module power by 10%, and increase production capacity at the same time, laying the foundation for further cost reduction and large-scale development.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of concise description, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (12)

1. A solar cell assembly, comprising a battery pack, characterized in that the battery pack includes several connected battery slices, and the battery slices are arranged in rows and columns; In the row direction, two adjacent battery sheets are overlapped and connected in series using connectors; In the column direction, two adjacent battery slices are connected in parallel through the connecting piece. 2 . The solar cell module according to claim 1 , wherein the cell sheet is a cell cut sheet, and the cell cut sheet is cut from a solar cell sheet. 3 . 3 . The solar cell module according to claim 1 , wherein all the cell pieces in the same column share the connecting member. 4 . 4 . The solar cell module according to claim 1 , wherein all the cell pieces in the same row are located on the same side of the connecting member. 5 . The solar cell assembly according to claim 1 , wherein the connecting piece is in the form of a sheet, and hollow holes are provided inside the connecting piece for communicating with two sides of the connecting piece. 6 . 6. The solar cell module according to claim 5, wherein the connecting member is in the shape of a strip, and the edge position of the long side of the connecting member is provided with a plurality of gaps arranged at intervals, and the gaps and The hollow holes are not connected. 7. The solar cell assembly according to claim 1, wherein the cell sheet comprises a front electrode and a back electrode; The connector includes a first surface connected to the front electrode and a second surface connected to the back electrode, the first surface is provided with alternately arranged first connection regions and first non-connection regions, so The second surface is provided with alternately connected second connection regions and second non-connection regions, and the projected area of the first non-connection regions on the first surface is greater than or equal to that of the second connection regions on the first surface. the projected area on the first surface; The front electrode is connected to the first connection area, and the back electrode is connected to the second connection area. 8. The solar cell module according to claim 7, wherein the projection of the first connection region on the first surface is a first projection, and the projection of the second connection region on the first surface is is the second projection, the interval between the first projection and the adjacent second projection is 1 mm to 20 mm. 9. The solar cell module according to claim 7, wherein the front electrode and the back electrode both extend along the length direction of the battery sheet, and the first non-connecting area and the second The first barrier welding layer and the second barrier welding layer are respectively arranged on the non-connecting area. 10. The solar cell module according to claim 7, wherein the front electrodes and the back electrodes both extend along the length direction of the battery sheet, and the front electrodes are provided with alternately arranged third connections region and a third non-connecting region, the back electrode is provided with alternately arranged fourth connecting regions and fourth non-connecting regions; The third connection area is connected to the first connection area, the fourth connection area is connected to the second connection area, and the third non-connection area and the fourth non-connection area are respectively provided with the first Three barrier solder layers and a fourth barrier solder layer. 11. A method for preparing a solar cell module, comprising the steps of: Provide several battery slices and several connectors; Connecting the plurality of battery slices with the plurality of connectors to obtain a battery pack, in which the battery slices are arranged in rows and columns; in the row direction, two adjacent batteries The sheets are overlapped and connected in series by connecting pieces; in the column direction, two adjacent battery sheets are connected in parallel through the connecting pieces. 12. The method for preparing a solar cell module according to claim 11, characterized in that the operation of connecting the several battery sheets with the several connectors is as follows: A plurality of battery sheets are arranged in a row to obtain a battery row, and then the connecting member and the battery row are alternately connected.