Battery string and photovoltaic module

Abstract

The battery string comprises a battery, a first adhesive and a first electric connecting piece, a plurality of first grid lines and a plurality of second grid lines are arranged on the surface of the battery, the polarity of the second grid lines is opposite to that of the first grid lines, the battery is provided with a plurality of connecting areas extending in the second direction, and in the plurality of connecting areas, the first adhesive and the second adhesive are connected in series. The connecting area closest to the edge of the battery in the first direction is an end connecting area, in the end connecting area, the second grid lines are lower than the first grid lines, first contact parts are arranged at the positions, corresponding to the end connecting area, of the first grid lines, the first adhesive is adhered to the end connecting area, and the second adhesive is adhered to the end connecting area. The first electric connecting piece is bonded to the end connecting area through first bonding glue, the first electric connecting piece is electrically connected with the first contact part in a contact mode, and the second grid line and the first electric connecting piece are spaced in an insulated mode through the first bonding glue. Therefore, the connection steps of the battery string can be optimized, so that the labor cost and the material cost can be saved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a battery string and a photovoltaic module. Background Technology

[0002] Currently, in solar cell strings, the solder ribbons heat up when energized, melting the solder on their surface to connect the ribbons to the cells. Related technologies involve soldering cells within a string, first requiring the printing of insulating adhesive and solder paste, and then welding the solder ribbons. This process is cumbersome, increasing the complexity of the string connection, material costs, and labor costs. Consequently, it affects the current collection efficiency of the photovoltaic modules, hindering rapid string installation and limiting the application of photovoltaic modules. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery string that simplifies the connection method of battery strings, thereby saving labor and material costs.

[0004] This utility model further proposes a photovoltaic module.

[0005] According to the present invention, a battery string includes: a battery, a first adhesive, and a first electrical connector. The surface of the battery is provided with a plurality of first grid lines and a plurality of second grid lines with opposite polarities to the first grid lines. The plurality of first grid lines and the plurality of second grid lines extend in a first direction and are spaced apart and staggered in a second direction. The first direction and the second direction are perpendicular. The battery is provided with a plurality of connection areas extending in the second direction and spaced apart in the first direction. Among the plurality of connection areas, the connection area closest to the edge of the battery in the first direction is an end connection area. In the end connection area, the height of the second grid lines is lower than the height of the first grid lines. The first grid lines are provided with first contact portions. The first grid lines and the second grid lines have opposite polarities, and the first direction and the second direction are perpendicular. The first adhesive is bonded to the end connection areas, and the first contact portions are exposed from the first adhesive. The first electrical connector is bonded to the end connection areas through the first adhesive. The first electrical connector and the first contact portions are electrically connected in contact. The second grid lines are insulated from the first electrical connector through the first adhesive.

[0006] According to the present invention, the battery string is provided with multiple first grid lines and multiple second grid lines on the surface of the battery, and multiple connection areas are provided on the battery. A first contact part is provided at the position of the first grid line corresponding to the end connection area. A first electrical connector is provided in the end connection area by a first adhesive. This not only enables the first electrical connector to be electrically connected to the first contact part, but also optimizes the connection steps of the battery string, thereby saving labor and material costs.

[0007] In some examples of this utility model, in the end connection area, the height of the first gate line is h1, the height of the second gate line is h2, and h1 and h2 satisfy the relationship: 0 < h2 ≤ 0.8h1.

[0008] In some examples of this utility model, h1 and h2 satisfy the relationship: 0.25h1≤h2≤0.75h1.

[0009] In some examples of this invention, in the end connection area, the height of the plurality of first gate lines is the same, and the height of the plurality of second gate lines is the same.

[0010] In some examples of this utility model, among the multiple connection areas, the connection area whose distance to the edge of the battery in the first direction is greater than that of the end connection area is a middle connection area. One of the first grid line and the second grid line is provided with a second contact portion at the position corresponding to the middle connection area, and the other is provided with a break at the position corresponding to the middle connection area. The battery string further includes: a second adhesive and a second electrical connector. The second adhesive is bonded to the middle connection area, the second contact portion is exposed from the second adhesive, the second electrical connector is bonded to the middle connection area through the second adhesive, the second electrical connector and the second contact portion are electrically connected in contact, and the other of the first grid line and the second grid line is insulated from the second electrical connector through the break.

[0011] In some examples of this utility model, the plurality of central connection areas include first central connection areas and second central connection areas arranged alternately. In the first central connection area, the first grid line is provided with the second contact portion and the second grid line is provided with the break. In the second central connection area, the second grid line is provided with the second contact portion and the first grid line is provided with the break.

[0012] In some examples of this utility model, the dimension of the break along the first direction is d1, and the width of the second electrical connector along the first direction is d2. d1 and d2 satisfy the relationship: 0.2d1 < d2 < d1.

[0013] In some examples of this utility model, the first contact portion is a plane; and / or the second contact portion is a plane.

[0014] In some examples of this utility model, the cross-section of the first electrical connector is one of a circle, a triangle, a sheet, and a trapezoid; and / or the cross-section of the second electrical connector is one of a circle, a triangle, a sheet, and a trapezoid.

[0015] The photovoltaic module according to this utility model includes: the battery string described above.

[0016] Compared with the prior art, the present invention adopts a method in which multiple first grid lines and multiple second grid lines are set on the surface of the battery, multiple connection areas are set on the battery, a first contact part is set at the position of the first grid line corresponding to the end connection area, and a first electrical connector is set in the end connection area by a first adhesive. This method can not only make the first electrical connector electrically connected to the first contact part, but also optimize the connection steps of the battery string, thereby saving labor and material costs.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a partial structural schematic diagram of the battery string according to an embodiment of the present utility model;

[0020] Figure 2 This is the first method in which the first electrical connector is placed on the battery;

[0021] Figure 3 This is the second method where the first electrical connector is placed on the battery;

[0022] Figure 4 This is step one of connecting the battery string;

[0023] Figure 5 This is step two of connecting the battery string.

[0024] Figure label:

[0025] 10. Battery; 11. First grid line; 12. Second grid line; 13. End connection area; 14. Break; 15. Middle connection area; 16. First contact part; 20. First adhesive; 30. First electrical connector. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0027] The following is for reference. Figures 1-5 This invention describes a battery string according to an embodiment of the present invention, which is used in a photovoltaic module. For example, a fully back-contact crystalline silicon photovoltaic cell 10.

[0028] like Figures 1-3 As shown, the battery string according to this utility model includes: a battery 10, a first adhesive 20, and a first electrical connector 30. The surface of the battery 10 is provided with a plurality of first grid lines 11 and a plurality of second grid lines 12 with opposite polarity to the first grid lines 11. The plurality of first grid lines 11 and the plurality of second grid lines 12 extend in a first direction and are spaced apart and staggered in a second direction. The first and second directions are perpendicular. The battery 10 is provided with a plurality of connection areas extending in the second direction and spaced apart in the first direction. Among the plurality of connection areas, the distance from the battery 10 in the first direction is... The nearest connection area is the end connection area 13. In the end connection area 13, the height of the second grid line 12 is lower than the height of the first grid line 11. The first grid line 11 is provided with a first contact portion 16. The first adhesive 20 is bonded to the end connection area 13, and the first contact portion 16 is exposed from the first adhesive 20. The first electrical connector 30 is bonded to the end connection area 13 through the first adhesive 20. The first electrical connector 30 and the first contact portion 16 are electrically connected in a contact manner. The second grid line 12 is insulated from the first electrical connector 30 through the first adhesive 20.

[0029] It is understood that the battery 10, the first adhesive 20, and the first electrical connector 30 constitute the main structure of the battery string. The surface of the battery 10 is provided with multiple first grid lines 11 and multiple second grid lines 12. The multiple first grid lines 11 extend in a first direction, thereby ensuring that the current is evenly distributed throughout the battery string. This arrangement can increase the current transfer power between battery strings and reduce current concentration, thereby improving the stability of the battery string. Moreover, the multiple first grid lines 11 can share the current load, thereby reducing the resistance of individual welding points or connections, as well as reducing the overall resistance and energy loss. The multiple second grid lines 12 also extend in the first direction, thereby ensuring that the current is evenly distributed throughout the battery string. This arrangement can increase the current transfer power between battery strings and reduce current concentration, thereby improving the stability of the battery string.

[0030] Furthermore, the multiple first grid lines 11 and multiple second grid lines 12 are alternately arranged in the second direction. This allows the first grid lines 11 and second grid lines 12 with opposite polarities to be alternately arranged, ensuring that the current is evenly distributed throughout the entire battery string. This arrangement allows for greater current transfer power between battery strings and reduces current concentration, thereby improving the stability of the battery string. For example, the first grid line 11 can be the positive electrode, and the second grid line 12 can be the negative electrode. The alternating arrangement of the first grid lines 11 and second grid lines 12 ensures the power transfer of current between battery strings.

[0031] In addition, the surface of the battery 10 is provided with multiple connection areas, which extend along the second direction and are spaced apart along the first direction. Among the multiple connection areas, the one located at the end is the end connection area 13. The end connection area 13 is provided with a first contact portion 16 at the position corresponding to the first grid line 11. The first contact portion 16 can be electrically connected to the first electrical connector 30, thereby forming an electrical connection between the batteries 10 and improving the power generation efficiency of the battery string. For example, the first electrical connector 30 is a solder strip, which facilitates the electrical connection between the first contact portion 16 and the first electrical connector 30.

[0032] The position where the second grid line 12 intersects with the end connection area 13 is lower in the height direction than the position where the first grid line 11 intersects with the end connection area 13. This arrangement can improve the current collection capability of the battery 10 and ensure that the current is evenly distributed throughout the battery string. This allows for greater current transfer power between battery strings and reduces current concentration, thereby improving the stability of the battery string.

[0033] Furthermore, the first adhesive 20 is located in the end connection area 13, and the first contact portion 16 is exposed from the first adhesive 20. This arrangement facilitates the first adhesive 20 to limit the first electrical connector 30 and also allows the first electrical connector 30 to be firmly connected to the end connection area 13. This optimizes the connection steps of the battery string, thereby saving labor and material costs. It also ensures that the current is evenly distributed throughout the battery string, which can result in greater current transfer power between battery strings and reduce current concentration, thereby improving the stability of the battery string.

[0034] Therefore, by setting multiple first grid lines 11 and multiple second grid lines 12 on the surface of the battery 10, and setting multiple connection areas on the battery 10, a first contact portion 16 is set at the position of the first grid line 11 corresponding to the end connection area 13, and the first electrical connector 30 is set in the end connection area 13 by the first adhesive 20, not only can the first electrical connector 30 be electrically connected to the first contact portion 16, but the connection steps of the battery string can also be optimized, thereby saving labor costs and material costs.

[0035] Optionally, such as Figure 1 As shown, in the end connection area 13, the height of the first grid line 11 is h1, and the height of the second grid line 12 is h2. h1 and h2 satisfy the relationship: 0 < h2 ≤ 0.8h1 or 0.25h1 ≤ h2 ≤ 0.75h1. It can be understood that the intersection of the second grid line 12 and the end connection area 13 is lower in height than the intersection of the first grid line 11 and the end connection area 13. This arrangement can improve the current collection capability of the battery 10 and ensure that the current is evenly distributed throughout the battery string, thereby increasing the current transfer power between battery strings and reducing current concentration, thus improving the stability of the battery string.

[0036] In particular, such as Figure 4 and Figure 5 As shown, in the end connection area 13, the heights of the multiple first grid lines 11 are the same, and the heights of the multiple second grid lines 12 are the same. That is, the heights of the intersections of the multiple first grid lines 11 and the end connection area 13 are the same, and the heights of the intersections of the multiple second grid lines 12 and the end connection area 13 are the same. This arrangement can improve the efficiency of the first adhesive 20 in the end connection area 13, and also optimize the connection between the first electrical connector 30 and the battery 10, thereby facilitating the arrangement of the first grid lines 11 and the second grid lines 12, which in turn can increase the current transfer power between the battery strings and reduce current concentration.

[0037] In addition, such as Figure 1 As shown, among the multiple connection areas, the connection area with a distance to the edge of the battery 10 in the first direction greater than that of the end connection area 13 is the middle connection area 15. One of the first grid line 11 and the second grid line 12 is provided with a second contact portion at a position corresponding to the middle connection area 15, and the other is provided with a break 14 at a position corresponding to the middle connection area 15. The battery string also includes: a second adhesive and a second electrical connector. The second adhesive is bonded to the middle connection area 15, and the second contact portion is exposed from the second adhesive. The second electrical connector is bonded to the middle connection area 15 through the second adhesive. The second electrical connector and the second contact portion are electrically connected in a contact manner. The other of the first grid line 11 and the second grid line 12 is insulated from the second electrical connector through the break 14.

[0038] It is understood that a central connection area 15 is provided on the surface of the battery 10. The central connection area 15 is a connection area other than the end connection area 13. The central connection area 15 extends along the second direction. The central connection area 15 and the end connection area 13 are spaced apart in the first direction. A second contact portion is provided at a position corresponding to one of the first grid line 11 and the second grid line 12 in the central connection area 15. A break 14 is provided at the other position corresponding to the other of the first grid line 11 and the second grid line 12 in the central connection area 15. The second contact portion can be electrically connected to the second electrical connector. The positive and negative polarities of the second electrical connector are alternately arranged, so that an electrical connection can be formed between the batteries 10, thereby improving the power generation efficiency of the battery string. Moreover, the break 14 not only facilitates the collection of current by the first grid line 11 or the second grid line 12, but also allows the second adhesive to fill the break 14, thereby facilitating the second adhesive to bond the second electrical connector, and thus facilitating the connection of the second electrical connector to the battery 10. For example, the second electrical connector is a solder strip, which facilitates the electrical connection between the second contact portion and the second electrical connector. In the first direction, the second electrical connector at the first central connection area 15 is first connected to the second grid line 12, and the second electrical connector at the second central connection area 15 is connected to the first grid line 11. In this way, the second electrical connectors with different polarities are staggered, so that the first grid line 11 and the second grid line 12 can be connected to the second electrical connectors of the corresponding polarities.

[0039] The second adhesive is located in the central connection area 15, and the second contact portion is exposed from the second adhesive. This arrangement facilitates the second adhesive to limit the second electrical connector and also allows the second electrical connector to be firmly connected to the central connection area 15. This optimizes the connection steps of the battery string, thereby saving labor and material costs. Moreover, the second electrical connector is insulated from the first grid line 11 by the second adhesive. This arrangement ensures that the current is evenly distributed throughout the battery string. This arrangement allows for greater current transfer power between battery strings and reduces current concentration, thereby improving the stability of the battery string.

[0040] In addition, such as Figure 1 As shown, the plurality of central connection areas 15 include a first central connection area and a second central connection area arranged alternately. In the first central connection area, the first grid line 11 is provided with a second contact portion and the second grid line 12 is provided with a break 14. In the second central connection area, the second grid line 12 is provided with a second contact portion and the first grid line 11 is provided with a break 14.

[0041] In other words, the first central connection area and the second central connection area are spaced apart along the first direction, which facilitates the connection between the second electrical connector and the battery 10. In the first central connection area, the first grid line 11 is provided with a second contact portion and the second grid line 12 is provided with a break 14. In the second central connection area, the second grid line 12 is provided with a second contact portion and the first grid line 11 is provided with a break 14. This arrangement facilitates the electrical connection between the second contact portion and the second electrical connector. The second adhesive fills the break 14, which facilitates the second adhesive to bond the second electrical connector and allows the batteries 10 to form an electrical connection, thereby improving the power generation efficiency of the battery string.

[0042] Optionally, such as Figure 1 As shown, the dimension of the break 14 along the first direction is d1, and the width of the second electrical connector along the first direction is d2. d1 and d2 satisfy the relationship: 0.2d1 < d2 < d1. It can be understood that the width of the second electrical connector along the first direction is smaller than the dimension of the break 14 along the first direction. This arrangement allows the second adhesive to fill the break 14, facilitating the bonding of the second electrical connector with the second adhesive, and enabling electrical connections to be formed between the batteries 10, thereby improving the power generation efficiency of the battery string.

[0043] In particular, such as Figure 1 As shown, the first contact portion 16 is a plane; the second contact portion is a plane. This arrangement allows the first contact portion 16 and the first electrical connector 30 to make full contact, as well as the second contact portion and the second electrical connector to make full contact, thereby facilitating the electrical connection of the first electrical connector 30 and the second electrical connector with the battery 10, and thus increasing the current transfer power between the battery strings.

[0044] Optionally, such as Figure 1 As shown, the cross-section of the first electrical connector 30 is one of a circle, triangle, sheet, and trapezoid; the cross-section of the second electrical connector is one of a circle, triangle, sheet, and trapezoid. This arrangement allows the batteries 10 to be electrically connected through the first electrical connector 30 and the second electrical connector, and also prevents stress concentration in the first electrical connector 30 or the second electrical connector, thereby preventing the first electrical connector 30 and the second electrical connector from breaking, and thus ensuring the yield and performance of the battery string.

[0045] Specifically, such as Figure 4 and Figure 5As shown, the welding method of battery 10 is as follows: First, a first adhesive 20 is set in the end connection area 13 and a second adhesive is set in the middle connection area 15. Then, the first electrical connector 30 and the second electrical connector are pressed down. Then, the first electrical connector 30 squeezes out the first adhesive 20 and comes into contact with the silver paste, and the second electrical connector squeezes out the second adhesive and comes into contact with the silver paste. The silver paste forms the corresponding first grid line 11 and second grid line 12. Finally, it is cured into a battery string.

[0046] The photovoltaic module according to this utility model includes: a battery string as described in the above embodiments. By providing a plurality of first grid lines 11 and a plurality of second grid lines 12 on the surface of the battery 10, and providing a plurality of connection areas on the battery 10, a first contact portion 16 is provided at the position of the first grid line 11 corresponding to the end connection area 13, and a first electrical connector 30 is provided in the end connection area 13 by means of a first adhesive 20. This not only enables the first electrical connector 30 to be electrically connected to the first contact portion 16, but also optimizes the connection steps of the battery string, thereby saving labor and material costs.

[0047] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0049] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery string, characterized in that, include: A battery (10) has a plurality of first grid lines (11) and a plurality of second grid lines (12) with opposite polarity to the first grid lines (11) on its surface. The plurality of first grid lines (11) and the plurality of second grid lines (12) extend in a first direction and are spaced apart and staggered in a second direction. The first direction and the second direction are perpendicular. The battery (10) has a plurality of connection areas that extend in the second direction and are spaced apart in the first direction. Among the plurality of connection areas, the connection area closest to the edge of the battery (10) in the first direction is an end connection area (13). In the end connection area (13), the height of the second grid line (12) is lower than the height of the first grid line (11). The first grid line (11) is provided with a first contact portion (16). A first adhesive (20) is bonded to the end connection area (13), and the first contact portion (16) is exposed from the first adhesive (20); The first electrical connector (30) is bonded to the end connection area (13) by the first adhesive (20). The first electrical connector (30) is electrically connected to the first contact portion (16) in a contact manner. The second grid line (12) is insulated from the first electrical connector (30) by the first adhesive (20).

2. The battery string according to claim 1, characterized in that, In the end connection area (13), the height of the first gate line (11) is h1, and the height of the second gate line (12) is h2, where h1 and h2 satisfy the following relationship: 0 < h2 ≤ 0.8h1.

3. The battery string according to claim 2, characterized in that, h1 and h2 satisfy the following relation: 0.25h1≤h2≤0.75h1.

4. The battery string according to claim 1, characterized in that, In the end connection area (13), the height of the plurality of first gate lines (11) is the same, and the height of the plurality of second gate lines (12) is the same.

5. The battery string according to any one of claims 1-4, characterized in that, Among the multiple connection areas, the connection area that is farther from the edge of the battery (10) in the first direction than the end connection area (13) is the middle connection area (15). One of the first grid line (11) and the second grid line (12) is provided with a second contact portion at the position corresponding to the middle connection area (15), and the other is provided with a break (14) at the position corresponding to the middle connection area (15). The battery string also includes: A second adhesive is bonded to the central connection area (15), and the second contact portion is exposed from the second adhesive. The second electrical connector is bonded to the central connection area (15) by the second adhesive. The second electrical connector is electrically connected to the second contact portion in a contact manner. The other of the first grid line (11) and the second grid line (12) is insulated from the second electrical connector through the break (14).

6. The battery string according to claim 5, characterized in that, The plurality of central connection areas (15) include a first central connection area and a second central connection area arranged at intervals and staggered. In the first central connection area, the first grid line (11) is provided with a second contact portion and the second grid line (12) is provided with the break (14). In the second central connection area, the second grid line (12) is provided with a second contact portion and the first grid line (11) is provided with the break (14).

7. The battery string according to claim 5, characterized in that, The dimension of the break (14) along the first direction is d1, and the width of the second electrical connector along the first direction is d2. d1 and d2 satisfy the following relationship: 0.2d1 < d2 < d1.

8. The battery string according to claim 5, characterized in that, The first contact portion (16) is planar; and / or The second contact portion is a plane.

9. The battery string according to claim 5, characterized in that, The cross-section of the first electrical connector (30) is one of a circle, a triangle, a sheet, and a trapezoid; and / or The cross-section of the second electrical connector is one of the following: circular, triangular, plate-shaped, and trapezoidal.

10. A photovoltaic module, characterized in that, include: The battery string according to any one of claims 1-9.

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