Cell piece, cell stacking structure and solar cell module

Abstract

The utility model provides a cell sheet, a cell stacking structure and a solar cell assembly, and relates to the photovoltaic field, the cell sheet is characterized in that at least one of the back surface and the front surface of the cell sheet is provided with a protective glue layer, the back surface is provided with a plurality of electrodes, and the protective glue layer is composed of a plurality of protective glue units arranged at intervals; the minimum distance between every two adjacent protection glue units is smaller than the projection width of electrodes on the surfaces of the battery pieces. According to the utility model, when the battery pieces are stacked, the electrode on the back surface of one battery piece is not in direct contact with the front surface of another adjacent battery piece, so that the effect of protecting the surfaces of the battery pieces is achieved. Besides, the protection adhesive layer is fixed on the front surface of the battery piece, and the protection adhesive layer is not easy to fall off or generate position deviation, so that the protection adhesive layer can generate a continuous protection effect on the surface of the battery piece.

Description

Technical Field

[0001] The utility model relates to the photovoltaic field, in particular to a battery sheet, a battery stacking structure and a solar cell assembly. Background Art

[0002] A back-contact cell refers to a type of cell in which the electrode pattern is printed on the backlight side of the cell. This results in the light-receiving side of the cell being easily scratched by friction from the electrode on the backlight side of another adjacent cell when the back-contact cells are stacked.

[0003] At present, a coating paper can be set between two adjacent back contact cells to protect the light-receiving surface of the cell from being scratched. Since the coating paper is an independent component, when the cell is used later, the coating paper can be removed and the cell can be disassembled.

[0004] The prior art has at least the following problems: the cost of using a large amount of laminated paper is high and the position of the laminated paper is easily offset. Utility Model Content

[0005] The utility model provides a battery sheet, a battery stacking structure and a solar cell assembly to solve the problems in the prior art.

[0006] In order to solve the above problems, the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a battery cell.

[0008] A protective adhesive layer is provided on at least one of the back and front surfaces of the battery cell, a plurality of electrodes are provided on the back surface, and the protective adhesive layer is composed of a plurality of protective adhesive units arranged at intervals; the minimum distance between two adjacent protective adhesive units is less than the projection width of the electrodes on the battery cell on the surface of the battery cell.

[0009] Optionally, the electrode includes a main grid and a fine grid;

[0010] In the case where the protrusion height of the main grid is greater than the protrusion height of the fine grid, the minimum distance between two adjacent protective glue units is less than the projection width of the main grid on the back side of the battery cell;

[0011] In the case where the protruding height of the main grid is smaller than the protruding height of the fine grid, the minimum distance between two adjacent protective glue units is smaller than the projection width of the fine grid on the back side of the battery cell.

[0012] Optionally, the electrode includes a welding point, a main grid and a fine grid;

[0013] When the protrusion height of the welding point is greater than the protrusion height of the main grid and the fine grid, the minimum distance between two adjacent protective glue units is less than the projection width of the welding point on the back side of the battery cell.

[0014] Optionally, the electrode comprises only a fine grid;

[0015] The minimum distance between two adjacent protective glue units is smaller than the projection width of the fine grid on the back side of the battery cell.

[0016] Optionally, the protective glue unit includes at least one of point-shaped protrusions, ring-shaped protrusions and strip-shaped protrusions.

[0017] Optionally, the protective glue unit includes a recessed structure for accommodating the electrode.

[0018] Optionally, the weight of a single protective glue unit is less than or equal to 15 mg.

[0019] Optionally, the protective adhesive layer is a transparent protective adhesive layer.

[0020] In a second aspect, the utility model provides a battery stack structure, comprising:

[0021] A plurality of stacked battery cells, wherein electrodes are arranged on the back of the battery cells;

[0022] In the battery stacking structure, the back side of one battery cell is arranged opposite to the front side of another adjacent battery cell; a protective adhesive layer is arranged on the front side of the battery cell; the protective adhesive layer is composed of a plurality of protective adhesive units arranged at intervals;

[0023] For two adjacent battery cells in the battery stacking structure, each electrode on the back of one battery cell has two corresponding adjacent protective glue units on the front of the other battery cell, and the minimum distance between two adjacent protective glue units is less than the projection width of the electrode on the back of the battery cell.

[0024] In a third aspect, the utility model provides a solar cell assembly, comprising:

[0025] Multiple battery cells.

[0026] In the present invention, a protective glue layer including a plurality of protective glue units can be provided on the front of the battery cell, so that when the battery cells are stacked, each electrode on the back of a battery cell can be supported by two adjacent protective glue units corresponding to the front of another adjacent battery cell, and the minimum distance between the two adjacent protective glue units is set to be smaller than the projection width of the electrode on the back of the battery cell, so that there is a suitable spacing between the two adjacent protective glue units, so that the electrode on the back of a battery cell does not directly contact the front surface of another adjacent battery cell, so that the front surface of the battery cell will not be scratched due to the contact of the electrodes, thereby playing a protective effect on the surface of the battery cell. In addition, the protective glue layer is fixed on the front of the battery cell, and the protective glue layer is not easy to fall off or shift in position, so that the protective glue layer can produce a continuous protective effect on the surface of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The figure is a schematic diagram of the cross-sectional structure of a battery cell according to an embodiment of the utility model.

[0029] Figure 2 A schematic cross-sectional view of a battery stacking structure according to an embodiment of the utility model;

[0030] Figure 3 A schematic diagram of the double-sided structure of a battery cell according to an embodiment of the utility model;

[0031] Figure 4 A schematic diagram of the double-sided structure of another battery cell according to an embodiment of the utility model;

[0032] Figure 5 A schematic diagram of the cross-sectional structure of a battery cell group according to an embodiment of the utility model;

[0033] Figure 6 A schematic diagram of the cross-sectional structure of another battery cell group according to an embodiment of the utility model;

[0034] Figure 7 A schematic diagram of the front structure of a battery cell according to an embodiment of the utility model

[0035] Figure 8 It is a schematic diagram of the front structure of another battery cell according to an embodiment of the utility model;

[0036] Fig. 9 It is a schematic diagram of the front structure of another battery cell according to an embodiment of the utility model;

[0037] Fig.10 A schematic diagram of the cross-sectional structure of a battery cell and a protective adhesive layer according to an embodiment of the utility model;

[0038] Fig.11 It is a structural schematic diagram of a tooling for a battery stacking structure according to an embodiment of the utility model. DETAILED DESCRIPTION

[0039] The following will describe the exemplary embodiments of the present invention in more detail with reference to the accompanying drawings. Although the accompanying drawings show exemplary embodiments of the present invention, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully demonstrate the scope of the present invention.

[0040] communicated to those skilled in the art.

[0041] Reference Figure 1 The embodiment of the utility model provides a battery cell 10, wherein a protective adhesive layer is provided on at least one of the back and front surfaces of the battery cell 10 (the figure 30 shows that the protective adhesive layer 30 is provided on the front surface of the battery cell 10), and a plurality of electrodes 20 are provided on the back surface, and the protective adhesive layer 30 is composed of a plurality of protective adhesive units 31 arranged at intervals; the minimum distance h between two adjacent protective adhesive units 31 is less than the projection width H of the electrode 20 on the battery cell 10 on the surface of the battery cell 10.

[0042] In the embodiment of the utility model, preferably, a protective glue layer 30 can be provided on the front side of the battery cell 10, so that when a plurality of battery cells 10 are stacked, each electrode 20 on the back side of a battery cell 10 can be supported by two adjacent protective glue units 31 corresponding to the front side of another adjacent battery cell 10. The appropriate spacing between the two adjacent protective glue units 31 can prevent the electrode 20 on the back side of a battery cell 10 from directly contacting the front side surface of another adjacent battery cell 10, so that the front side surface of the battery cell will not be scratched due to electrode contact, thereby achieving a protective effect on the surface of the battery cell.

[0043] Reference Figure 2The present invention provides a schematic diagram of a battery stack structure according to an embodiment of the present invention. The battery stack structure comprises: a plurality of stacked battery cells 10, wherein electrodes 20 are arranged on the back of the battery cells 10; in the battery stack structure, the back of one battery cell 10 is arranged opposite to the front of another adjacent battery cell 10; a protective adhesive layer 30 is arranged on the front of the battery cell 10; the protective adhesive layer 30 is composed of a plurality of protective adhesive units 31 arranged at intervals; for two adjacent battery cells 10 in the battery stack structure, each electrode 20 on the back of one battery cell 10 has two corresponding adjacent protective adhesive units 31 on the front of the other battery cell 10, and the minimum distance h between the two adjacent protective adhesive units 31 is less than the projection width H of the electrode 20 on the back of the battery cell 10.

[0044] In the embodiment of the present utility model, refer to Figure 3 The cell 10 with electrodes only arranged on the back is a back contact cell, and the front of the back contact cell can be fully exposed to sunlight, which improves the light absorption efficiency. The design of the back contact cell can also reduce the path of current transmission, reduce resistance, and improve battery performance.

[0045] Specifically, refer to Figure 2 In a battery stack structure formed by stacking a plurality of stacked battery cells 10, how to ensure that the two opposite surfaces of adjacent battery cells are not scratched by low-cost measures is an important research direction at present. In order to solve this problem, in an embodiment of the utility model, in the battery stack structure, the back surface of one battery cell 10 can be opposite to the front surface of another adjacent battery cell 10.

[0046] Since the electrode 20 is disposed on the back of the battery cell 10, in order to prevent the electrode 20 on the back of one battery cell 10 from scratching the front of another adjacent battery cell 10, the embodiment of the utility model can be provided with a protective glue layer 30 on the front of the battery cell 10, and the protective glue layer 30 is specifically composed of a plurality of protective glue units 31; the embodiment of the utility model designs the arrangement of the protective glue units 31 on the front of the battery cell 10, so that each electrode 20 on the back of one battery cell 10 has two corresponding adjacent protective glue units 31 on the front of another battery cell 10, and the minimum distance h between the two adjacent protective glue units 31 is set to be less than the projection width H of the electrode 20 on the back of the battery cell 10.

[0047] With such a design, when the battery cells 10 are stacked, each electrode 20 on the back of a battery cell 10 can be supported by two adjacent protective glue units 31 corresponding to the front of another adjacent battery cell 10. The appropriate spacing between the two adjacent protective glue units 31 can prevent the electrode 20 on the back of a battery cell 10 from directly contacting the front surface of another adjacent battery cell 10, so that the front surface of the battery cell will not be scratched due to electrode contact, thereby protecting the surface of the battery cell. In addition, the protective glue layer is fixed on the front of the battery cell, and the protective glue layer is not easy to fall off or shift, so that the protective glue layer can provide continuous protection for the surface of the battery cell.

[0048] For example, Figure 2 In the battery stacking structure with 4 layers of battery cells 10 shown, the surface protection of the battery cells is achieved by the mutual support between the electrodes 20 and the protective glue units 31 between every two adjacent battery cells 10. There is no need to cover the front of the battery cells 10 with a complete layer of protective glue. The design of the protective glue units 31 arranged at intervals requires a smaller amount of glue.

[0049] Optionally, the protective adhesive layer is a transparent protective adhesive layer.

[0050] It should be noted that the protective adhesive layer of the embodiment of the utility model can be made of light-curing adhesive material (such as ultraviolet curing adhesive), evaporable adhesive material, degradable adhesive material, organic melt adhesive material, etc., so as to meet the processing technology requirements. In addition, the material of the protective adhesive layer used has a certain elasticity, so as to meet the protection and buffering requirements of the front of the battery cell. The protective adhesive layer is a transparent protective adhesive layer, which can make it unnecessary to remove the protective adhesive layer set on the front of the battery cell later, so that the battery cell and the protective adhesive layer can be used as a whole, and the transparent protective adhesive layer does not affect the light receiving effect of the front of the battery cell.

[0051] In the present invention, a protective glue layer including a plurality of protective glue units can be provided on the front of the battery cell, so that when the battery cells are stacked, each electrode on the back of a battery cell can be supported by two adjacent protective glue units corresponding to the front of another adjacent battery cell, and the minimum distance between the two adjacent protective glue units is set to be smaller than the projection width of the electrode on the back of the battery cell, so that there is a suitable spacing between the two adjacent protective glue units, so that the electrode on the back of a battery cell does not directly contact the front surface of another adjacent battery cell, so that the front surface of the battery cell will not be scratched due to the contact of the electrodes, thereby playing a protective effect on the surface of the battery cell. In addition, the protective glue layer is fixed on the front of the battery cell, and the protective glue layer is not easy to fall off or shift in position, so that the protective glue layer can produce a continuous protective effect on the surface of the battery cell.

[0052] Optional, see Figure 4, the electrode 20 includes a main grid 21 and a fine grid 22; Figure 5 , when the protrusion height of the main grid 21 is greater than the protrusion height of the fine grid 22, the minimum distance h between two adjacent protective glue units 31 is less than the projection width H1 of the main grid 21 on the back side of the battery cell 10; Figure 6 When the protrusion height of the main grid 21 is smaller than the protrusion height of the fine grid 22 , the minimum distance h between two adjacent protective glue units 31 is smaller than the projection width H2 of the fine grid 22 on the back side of the battery cell 10 .

[0053] In the embodiment of the present utility model, refer to Figure 4 , which shows a schematic diagram of the double-sided specific structure of a battery cell. For a back-contact battery in which both the electrode and the electrode are arranged on the back of the battery cell, the electrode can specifically include a main grid 21 and a fine grid 22, and the main grid 21 is perpendicular to the fine grid 22.

[0054] Reference Figure 5 In the case where the protruding height of the main grid 21 of the battery cell 10 is greater than the protruding height of the fine grid 22, when two adjacent battery cells 10 are stacked, the main grid 21 on the back of one battery cell 10 first contacts and supports the two adjacent protective glue units 31 corresponding to the front of the other battery cell 10, while the fine grid 22, due to its shorter height, will not contact the front of the other battery cell 10 on the premise that the main grid 21 has formed support, thereby avoiding direct contact between the electrode of one battery cell and the front surface of another battery cell, thus solving the problem of scratching the front of another battery cell by the electrode of one battery cell, thereby improving the protection effect on the surface of the battery cell.

[0055] Reference Figure 6 In the case where the protruding height of the main grid 21 of the battery cell 10 is less than the protruding height of the fine grid 22, when two adjacent battery cells 10 are stacked, the fine grid 22 on the back of one battery cell 10 first contacts and supports the two adjacent protective glue units 31 corresponding to the front of the other battery cell 10. Since the main grid 21 is shorter, under the premise that the fine grid 22 has formed support, the main grid 21 will not contact the front of the other battery cell 10, thereby avoiding direct contact between the electrode of one battery cell and the front surface of another battery cell, thus solving the problem of scratching the front of another battery cell by the electrode of one battery cell, thereby improving the protection effect on the surface of the battery cell.

[0056] Optional, see Figure 4 The electrode 20 includes a welding point 23, a main grid 21 and a fine grid 22; when the protrusion height of the welding point 23 is greater than the protrusion heights of the main grid 21 and the fine grid 22, the minimum distance between two adjacent protective glue units 31 is less than the projection width of the welding point 23 on the back side of the battery cell.

[0057] In one implementation of the embodiment of the utility model, the electrode 20 may include a welding point 23 in addition to the main grid 21 and the fine grid 22. The welding point 23 is a pad (also called a pad point) and is specifically used to realize welding of the electrode 20. Therefore, when the protrusion height of the welding point 23 is greater than the protrusion height of the main grid 21 and the fine grid 22, when two adjacent battery cells 10 are stacked, the welding point 23 on the back of one battery cell 10 first contacts and supports the two adjacent protective glue units 31 corresponding to the front of the other battery cell 10, and the main grid 21 and the fine grid 22 are shorter in height. Under the premise that the welding point 23 has formed support, the main grid 21 and the fine grid 22 will not contact the front of the other battery cell 10, thereby avoiding direct contact between the electrode of one battery cell and the front surface of the other battery cell, thus solving the problem of scratching the front of the other battery cell by the electrode of one battery cell, thereby improving the protection effect on the surface of the battery cell.

[0058] Optionally, the electrode includes only fine grids; and the minimum distance between two adjacent protective glue units is smaller than the projection width of the fine grids on the back side of the battery cell.

[0059] In an embodiment of the utility model, if the battery cell is a 0BB battery cell (which can reduce silver consumption, increase power, and improve yield), the electrode of the battery cell only includes a fine grid, and the electrode on the back of one battery cell contacts and supports two adjacent protective glue units corresponding to the front of another battery cell, and the minimum distance between the two adjacent protective glue units is less than the projection width of the fine grid on the back of the battery cell. This allows a suitable spacing between the two adjacent protective glue units, so that the fine grid on the back of one battery cell does not directly contact the front surface of another adjacent battery cell, so that the front surface of the battery cell will not be scratched due to electrode contact, thereby achieving a protective effect on the surface of the battery cell.

[0060] Optionally, the protective glue unit includes at least one of point-shaped protrusions, ring-shaped protrusions and strip-shaped protrusions.

[0061] In the embodiment of the utility model, in order to reduce the amount of glue used and thus save production costs, the protective glue layer can be configured to include multiple protective glue units arranged at intervals; the protective glue units include: any one of glue dots, glue strips, and glue blocks. In this way, there is no need to completely cover the front of the battery cell with a flat glue layer, thus saving the amount of glue used.

[0062] Reference Figure 7 , which shows that the protective glue unit 31 is in the form of dot-shaped protrusions, and the protective glue unit 31 can be distributed in an array on the front side of the battery cell 10. Figure 8 , which shows that the protective glue unit 31 is in the form of a strip-shaped protrusion, and the protective glue unit 31 can be distributed in the form of an array on the positive side of the battery cell 10

[0063] Surface. Fig. 9 , which shows that the protective glue unit 31 is in the form of an annular protrusion, and the protective glue unit 31 can be distributed in an array on the front of the battery cell 10. Regardless of the form of the protective glue unit, it can form effective support, isolation and buffer on the front of the battery cell, thereby effectively protecting the front of the battery cell.

[0064] Optional, see Fig.10 The protective glue unit 31 includes a recessed structure 311 for accommodating the electrode 20 .

[0065] In the embodiment of the utility model, the protective glue unit 31 can be further configured to have a recessed structure 311, so that the recessed structure 311 of the protective glue unit 31 can support the electrode 20, so that the electrode on the back of one battery cell is not in direct contact with the front surface of another adjacent battery cell, thereby protecting the surface of the battery cell.

[0066] Optionally, the weight of a single protective adhesive unit is less than or equal to 15 mg.

[0067] In the embodiment of the utility model, the weight of a single protective glue unit is controlled to be less than or equal to 15 mg, so that the basic supporting function of the protective glue unit can be achieved on the basis of saving the amount of glue.

[0068] Reference Fig.11 An embodiment of the utility model provides a tool for accommodating a battery stacking structure, including: a tool body 40, and a battery stacking structure arranged in the tool body 40.

[0069] In the embodiment of the utility model, the tool body 40 is used to fix, store and transport the battery stack structure, and to provide overall external protection for the battery stack structure. The part of the tool body 40 that contacts the battery stack structure can also be filled with a buffer (such as foam, silicone plate, wool pad, etc.) to further improve the protection effect.

[0070] The embodiment of the utility model further provides a solar cell assembly, comprising: a plurality of solar cells 10. The plurality of solar cells 10 can be spliced ​​into a back-contact solar cell assembly for use.

[0071] In summary, in the present invention, the battery stacking structure is composed of a plurality of stacked battery cells, and the back of a battery cell is arranged opposite to the front of another adjacent battery cell. Such a stacking method enables the surface contact in the stacking structure, including the contact between the back of the battery cell and the front of the battery cell in each group of battery cells. The present invention can set a protective glue layer including a plurality of protective glue units on the front of the battery cell, so that each electrode on the back of a battery cell can be supported by two adjacent protective glue units corresponding to the front of another adjacent battery cell, and the minimum distance between the two adjacent protective glue units is set to be less than the projection width of the electrode on the back of the battery cell, which makes the two adjacent protective glue units have a suitable spacing, so that the electrode on the back of a battery cell does not directly contact the front surface of another adjacent battery cell, so that the front surface of the battery cell will not be scratched due to the contact of the electrodes, thereby playing a protective effect on the surface of the battery cell. In addition, the protective glue layer is fixed on the front of the battery cell, and the protective glue layer is not easy to fall off or shift in position, so that the protective glue layer can produce a continuous protective effect on the surface of the battery cell.

[0072] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present utility model can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: A protective adhesive layer is provided on at least one of the back and front surfaces of the battery cell, a plurality of electrodes are provided on the back surface, and the protective adhesive layer is composed of a plurality of protective adhesive units arranged at intervals; the minimum distance between two adjacent protective adhesive units is less than the projection width of the electrodes on the battery cell on the surface of the battery cell.

2. The battery cell according to claim 1, characterized in that: The electrode comprises a main grid and a fine grid; In the case where the protrusion height of the main grid is greater than the protrusion height of the fine grid, the minimum distance between two adjacent protective glue units is less than the projection width of the main grid on the back side of the battery cell; In the case where the protruding height of the main grid is smaller than the protruding height of the fine grid, the minimum distance between two adjacent protective glue units is smaller than the projection width of the fine grid on the back side of the battery cell.

3. The battery cell according to claim 1, characterized in that: The electrode comprises a welding point, a main grid and a fine grid; When the protrusion height of the welding point is greater than the protrusion height of the main grid and the fine grid, the minimum distance between two adjacent protective glue units is less than the projection width of the welding point on the back side of the battery cell.

4. The battery cell according to claim 1, characterized in that: The electrode comprises only a thin grid; The minimum distance between two adjacent protective glue units is smaller than the projection width of the fine grid on the back side of the battery cell.

5. The battery cell according to claim 1, characterized in that: The protective glue unit includes a recessed structure for accommodating the electrode.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The protective glue unit includes at least one of point-shaped protrusions, ring-shaped protrusions and strip-shaped protrusions.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The weight of a single protective glue unit is less than or equal to 15 mg.

8. The battery cell according to any one of claims 1 to 5, characterized in that: The protective adhesive layer is a transparent protective adhesive layer.

9. A battery stack structure, characterized in that: The battery stack structure comprises: A plurality of stacked cells according to any one of claims 1 to 8, wherein electrodes are provided on the back of the cells; In the battery stacking structure, the back side of one battery cell is arranged opposite to the front side of another adjacent battery cell; a protective adhesive layer is arranged on the front side of the battery cell; the protective adhesive layer is composed of a plurality of protective adhesive units arranged at intervals; For two adjacent battery cells in the battery stacking structure, each electrode on the back of one battery cell has two corresponding adjacent protective glue units on the front of the other battery cell, and the minimum distance between two adjacent protective glue units is less than the projection width of the electrode on the back of the battery cell.

10. A solar cell module, characterized in that: include: A plurality of battery cells as described in any one of claims 1 to 8.

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