Battery piece, photovoltaic module and photovoltaic system

Abstract

The utility model provides a battery piece, a photovoltaic assembly and a photovoltaic system, relates to the field of photovoltaic technology, and solves the technical problem that the current collection effect and the welding strength are affected in the prior art. According to the device, in the direction of the second edge, a first bonding pad, a second bonding pad and a third bonding pad are sequentially arranged on the two sides of the battery piece from the first edge to the center at intervals. The distance from the first edge to the center of the first bonding pad adjacent to the first edge is S0, the distance from the center of the first bonding pad to the center of the second bonding pad adjacent to the first bonding pad is S1, and the distance from the center of the second bonding pad to the center of the third bonding pad adjacent to the second bonding pad is S2; wherein S1 is larger than S0 and smaller than S2. According to the utility model, the bonding pads are arranged in the above manner, so that the bonding pads close to the edge of the battery piece are arranged in a manner of gradually reducing the distance, and the problem that the distance between the two bonding pads is suddenly increased to influence the current collection effect and the welding strength is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a battery sheet, a photovoltaic component and a photovoltaic system. Background Art

[0002] The battery cells are connected by welding ribbons to form a battery string, and the pads (PAD points) used for welding with the welding ribbons are set on the back of the battery cells. Currently, conventional battery strings usually set the pads evenly during welding, which affects the current collection effect and the welding strength at the edge. Utility Model Content

[0003] The utility model aims to provide a solar cell, a photovoltaic module and a photovoltaic system, aiming to solve the problems existing in the prior art that affect the current collection effect and welding strength.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The utility model provides a battery cell, which has a first side and a second side perpendicular to each other. Along the second side, both sides of the battery cell are provided with a first soldering pad, a second soldering pad and a third soldering pad in sequence from the first side to the center. The distance from the first side to the center of the first soldering pad adjacent to it is S0, the distance from the center of the first soldering pad to the center of the second soldering pad adjacent to it is S1, and the distance from the center of the second soldering pad to the center of the third soldering pad adjacent to it is S2; wherein, S0<S1<S2.

[0006] Preferably, S0≥(S1+k) / 2, 2≤k≤3.

[0007] Preferably, along the second side direction, there are multiple third pads, and the multiple third pads are arranged at equal intervals or non-equal intervals.

[0008] Preferably, along the first side direction, the first pad, the second pad and the third pad are arranged at intervals to form an array along the first side and the second side direction.

[0009] Preferably, the first side length is greater than the second side length.

[0010] Preferably, the length of the second side is 50%-53% of the length of the first side.

[0011] Preferably, the distance S1 between the center of the first pad 3 and the center of the adjacent second pad 4 is ≥10 mm, and / or the distance S2 between the center of the second pad 4 and the center of the adjacent third pad 5 is >10 mm.

[0012] Preferably, the cell type is a silicon-based cell, a heterojunction cell, or a perovskite cell.

[0013] Particularly preferably, the cell is a back-contact cell.

[0014] The photovoltaic module provided by the utility model has multiple battery strings, each of which has multiple battery cells mentioned above, and each of which has multiple welding strips, which connect the first welding pad, the second welding pad and the third welding pad. In the battery string, the distance between the centers of two adjacent first welding pads on two adjacent battery cells is S3; wherein S3>S2.

[0015] The photovoltaic system provided by the utility model comprises the photovoltaic assembly mentioned above.

[0016] This application adopts the above technical solution, which has at least the following beneficial effects:

[0017] The battery cell has a first side and a second side perpendicular to each other. Along the second side, the first pad, the second pad and the third pad are arranged in sequence from the first side to the center on both sides of the battery cell; the distance from the first side to the center of the first pad adjacent to it is S0, the distance from the center of the first pad to the center of the second pad adjacent to it is S1, and the distance from the center of the second pad to the center of the third pad adjacent to it is S2; wherein, S0<S1<S2. Such a setting allows the pads near the edge of the battery cell to be arranged in a manner of gradually reducing the spacing, avoiding the problem of the distance between the two pads suddenly increasing and affecting the current collection effect and welding strength.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of a local enlarged structure of a battery string provided in an embodiment of the utility model.

[0021] In the figure, 1 is the first side; 2 is the second side; 3 is the first pad; 4 is the second pad; 5 is the third pad; 6 is the soldering strip. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0023] The specific embodiment of the utility model provides a battery sheet, having a first side 1 and a second side 2 perpendicular to each other, and combining with an attached Figure 1 As shown, along the second side 2, the battery cell can be a rectangular sheet structure, both sides of the battery cell are first sides 1, and the first pad 3, the second pad 4 and the third pad 5 are sequentially arranged from the first sides 1 on both sides to the center; the distance from the first side 1 to the center of the first pad 3 adjacent to it in the same battery cell is S0, the distance from the center of the first pad 3 to the center of the second pad 4 adjacent to it is S1, and the distance from the center of the second pad 4 to the center of the third pad 5 adjacent to it is S2; wherein, S0<S1<S2, so that the three pads are arranged in a manner with gradually decreasing spacing from the first side 1, so that the problem of suddenly increasing the distance between the pads and affecting the current collection effect and welding strength can be avoided.

[0024] In some embodiments, the battery cell may be a back-contact battery cell, and the type of the battery cell may be a silicon-based battery cell, a heterojunction battery cell, or a perovskite battery cell.

[0025] In some embodiments, the layout of the pads on the battery cell in the present application satisfies S0≥(S1+k) / 2, 2≤k≤3, where k is a process experience value, the unit is mm, for example, k can be 2mm or 3mm. This setting method is intended to ensure current collection while ensuring the welding effect.

[0026] In some embodiments, there are multiple third pads 5 along the direction of the second side 2, and the multiple third pads 5 are arranged at equal intervals. Such an arrangement with equal intervals can achieve high current collection efficiency.

[0027] Along the second side 2, there are multiple third pads 5, and the multiple third pads 5 are arranged at non-uniform intervals. In actual string welding, due to the optimization and adjustment of the number of fine grids, the difference between the distances of adjacent third pads 5 is often an integer multiple of the distances of adjacent fine grids. At this time, a non-uniform arrangement of the third pads 5 will appear. This setting method is intended to adapt to the optimization and adjustment of the number of fine grids in practice. This non-uniform arrangement can be a cyclic alternating arrangement of at least two spacing sizes, S4 and S5, such as S4, S5, S4, S5...S4; it can also be a random arrangement of multiple sizes; or even arranged in an arithmetic progression.

[0028] In some embodiments, along the first edge 1, the first pad 3, the second pad 4, and the third pad 5 are arranged at intervals to form an array along the first edge 1 and the second edge 2. Such an arrangement can achieve high current collection efficiency and ensure reliable welding at the ends of the battery cell.

[0029] In some embodiments, the length of the first side 1 is greater than the length of the second side 2, the welding direction of the welding ribbon 6 is along the second side, and the battery cell can be rectangular, so that multiple battery cells are easier to arrange during series welding.

[0030] In some embodiments, the length of the second side 2 is 50%-53% of the length of the first side 1. For example, the length of the first side 1 ranges from 180 to 185 mm, and the length of the second side 2 ranges from 90 to 97 mm.

[0031] In some embodiments, the distance S0 from the first side 1 of the battery cell to the center of the first pad 3 adjacent thereto in the cell is ≥6.5 mm. Preferably, S0 may be about 6.5 mm, about 7 mm, or about 7.5 mm.

[0032] In some embodiments, the distance S1 between the center of the first solder pad 3 and the center of the adjacent second solder pad 4 is ≥10 mm. Preferably, S1 can be about 10.5 mm, about 10.6 mm, about 10.7 mm, about 10.8 mm, about 10.9 mm, about 11 mm, about 11.1 mm, about 11.2 mm, about 11.3 mm, about 11.4 mm, or about 11.5 mm.

[0033] In some embodiments, the distance S2 between the center of the second solder pad 4 and the center of the adjacent third solder pad 5 is greater than 10 mm, preferably, 10 mm less than S2 ≤ 13 mm, and in particular S2 can be about 10.5 mm, about 10.6 mm, about 10.7 mm, about 10.8 mm, about 10.9 mm, about 11 mm, about 11.1 mm, about 11.2 mm, about 11.3 mm, about 11.4 mm, about 11.5 mm, about 11.6 mm, about 11.7 mm, about 11.8 mm, about 11.9 mm, about 12 mm, about 12.1 mm, about 12.2 mm, about 12.3 mm, about 12.4 mm, or about 12.5 mm.

[0034] A photovoltaic module is also provided in a specific embodiment of the present application, including multiple battery strings, each battery string having a plurality of the above-mentioned battery cells. In the battery string, the distance between the centers of two adjacent first welding pads on two adjacent battery cells is S3, wherein S3>S2, and S3=2S0+d, and in practice the distance d between two battery cells is ≥0mm.

[0035] In some embodiments, the number of cell strings in a photovoltaic module may be 144, 136, 132, 120, 116, 108, 96, 56, 36, etc.

[0036] In some embodiments, the battery string has multiple welding ribbons 6, which connect the first welding pad 3, the second welding pad 4 and the third welding pad 5, wherein one welding ribbon 6 connects at least two adjacent battery cells, and the provision of multiple welding ribbons 6 ensures high current collection efficiency of the entire battery cell.

[0037] A photovoltaic system is also provided in a specific embodiment of the present application, including the above-mentioned photovoltaic assembly.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", "some examples", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0041] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A battery cell, the battery cell having a first side and a second side perpendicular to each other, characterized in that: Along the second side direction, the first pad, the second pad and the third pad are arranged on both sides of the battery cell in sequence from the first side to the center; the distance from the first side to the center of the first pad adjacent to it is S0, the distance from the center of the first pad to the center of the second pad adjacent to it is S1, and the distance from the center of the second pad to the center of the third pad adjacent to it is S2; wherein, S0<S1<S2.

2. The battery cell according to claim 1, characterized in that: S0≥(S1+k) / 2, 2≤k≤3.

3. The battery cell according to claim 1 or 2, characterized in that: The battery cell is a back contact battery cell.

4. The battery cell according to claim 3, characterized in that: Along the second side direction, there are multiple third pads, and the multiple third pads are arranged at equal intervals or non-equal intervals.

5. The battery cell according to claim 4, characterized in that: Along the first side direction, the first pads, the second pads, and the third pads are arranged at intervals to form an array along the first side and the second side direction.

6. The battery cell according to any one of claims 1-2, 4-5, characterized in that: The first side length is greater than the second side length.

7. The battery cell according to claim 6, characterized in that: The length of the second side is 50%-53% of the length of the first side.

8. The battery cell according to any one of claims 1-2, 4-5, and 7, characterized in that: A distance S1 from the center of the first pad to the center of the second pad adjacent thereto is ≥10 mm, and / or a distance S2 from the center of the second pad to the center of the third pad adjacent thereto is >10 mm.

9. A photovoltaic module, comprising a plurality of battery strings, wherein the battery strings comprise a plurality of battery cells according to any one of claims 1 to 8, wherein the battery strings comprise a plurality of welding strips, wherein the welding strips connect the first welding pad, the second welding pad and the third welding pad, wherein: In the battery string, the distance between the centers of two adjacent first pads on two adjacent battery cells is S3; wherein S3>S2.

10. A photovoltaic system, characterized in that: The photovoltaic module according to claim 9 is included.

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