HJT cell string and photovoltaic module

Abstract

The utility model discloses a kind of HJT battery string and photovoltaic module, including cell piece and solder strip;The solder strip is long strip flat, the solder strip includes front welding section, transition section, back welding section connected in turn, the both sides of the front welding section, the back welding section are provided with welding piece and slit, adjacent the welding piece staggered arrangement, adjacent the slit staggered arrangement, the slit and the welding piece are oppositely arranged;The front welding section is welded in the front of first piece the cell piece by the welding piece of this section, the back welding section is welded in the back of second piece the cell piece by the welding piece of this section.The utility model is good to eliminate stress, prevent cell piece crack, and the contact effect between solder strip and cell piece is better.

Description

Technical Field

[0001] This utility model relates to photovoltaic modules, specifically an HJT battery string and a photovoltaic module. Background Technology

[0002] Heterojunction (HJT) solar cells are connected by welding ribbons. Currently, one end of the ribbon is welded to the front of the first cell, and the other end is directly welded to the back of the second cell. Due to thermal expansion and contraction, this structure cannot eliminate the stress between the ribbon and the cell, which can cause the cell to crack. Utility Model Content

[0003] To address the shortcomings of the prior art, this invention provides an HJT battery string and photovoltaic module. This invention effectively eliminates stress, prevents battery cell cracking, and provides better contact between the solder ribbon and the battery cell.

[0004] To achieve the above technical objectives, this utility model adopts the following technical solution: an HJT battery string, comprising battery cells and welding strips; the welding strip is a long, flat strip, comprising a front welding section, a transition section, and a back welding section connected in sequence; welding tabs and notches are provided on both sides of the front welding section and the back welding section; adjacent welding tabs are staggered, adjacent notches are staggered, and the notches and welding tabs are opposite to each other; the front welding section is welded to the front of the first battery cell through the welding tabs of the section, and the back welding section is welded to the back of the second battery cell through the welding tabs of the section.

[0005] The welding piece is a rectangle formed by extending outward from the body.

[0006] The notch is an isosceles triangle and is aligned with the center of the corresponding weld piece.

[0007] The front edge of the battery cell has a front notch and the back edge has a back notch. The front notch and the back notch are symmetrical. The solder strip extends from the front notch of the first battery cell to the back notch of the second battery cell.

[0008] The thickness of the front notch and the back notch is less than the thickness of the battery cell.

[0009] Both the front notch and the back notch are curved surfaces.

[0010] An HJT photovoltaic module, comprising an HJT cell string.

[0011] In summary, this utility model achieves the following technical effects:

[0012] This invention features a welding tab on the welding strip for welding to the main grid of the battery cell, and is equipped with a notch to eliminate stress generated during welding, ensuring good welding effect and minimal deformation of the welding strip;

[0013] This invention assigns a notch to a welding piece, and the welding pieces and notches are evenly spaced, resulting in a tighter weld and better stress relief. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an HJT battery string;

[0015] Figure 2 This is a top view of the solder strip;

[0016] Figure 3 This is a side view of the battery cell;

[0017] Figure 4 This is a side view of the connection between the battery cell and the solder strip. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] Example:

[0025] Figure 1 It is an HJT battery string, including battery cell 1 and solder strip 2.

[0026] Figure 2 This is a top view of the welding strip. The welding strip 2 is a long, flat strip. The welding strip 2 includes a front welding section 21, a transition section 22, and a back welding section 23 connected in sequence. Welding pieces 24 and notches 25 are provided on both sides of the front welding section 21 and the back welding section 23. Adjacent welding pieces 24 are staggered, and adjacent notches 25 are staggered. The notches 25 and the welding pieces 24 are positioned opposite each other. The front welding section 21 is welded to the front of the first battery cell 1 through the welding pieces 24 of this section, and the back welding section 23 is welded to the back of the second battery cell 1 through the welding pieces 24 of this section.

[0027] This invention features a welding strip on the welding strip 2, which is welded to the main grid of the battery cell. It also includes a notch to eliminate stress generated during welding, ensuring good welding results and minimal deformation of the welding strip.

[0028] The welding strip 24 is a rectangle extending outward from the body. In this embodiment, the rectangle is oblong, with its short side connected to the welding strip body.

[0029] The notch 25 is an isosceles triangle and is aligned with the center of the corresponding welding piece 24. In this embodiment, one notch corresponds to one welding piece, and the welding pieces and notches are evenly spaced, resulting in a tighter weld and better stress relief.

[0030] Figure 3 This is a side view of the battery cell. Figure 4 This is a side view of the connection between the battery cell and the solder ribbon. The front edge of the battery cell 1 has a front notch 11 and the back edge has a back notch 12. The front notch 11 and the back notch 12 are symmetrical. The solder ribbon 2 extends from the front notch 11 of the first battery cell 1 to the back notch 12 of the second battery cell 1.

[0031] Figure 3 The dashed lines in the middle represent the front notch 11 and the back notch 12. The front notch 11 and the back notch 12 are evenly distributed and correspond one-to-one with the welding position of the welding strip. This allows the welding strip to make better contact with the edge of the battery cell, prevents the welding strip from crushing the battery cell, and also effectively limits the welding strip to prevent it from deflecting.

[0032] The thickness of the front notch 11 and the back notch 12 is less than the thickness of the battery cell 1, and does not affect the strength of the battery cell.

[0033] Both the front notch 11 and the back notch 12 are arc-shaped surfaces, which can make good contact with the flat welding strip and prevent scratching the welding strip.

[0034] An HJT photovoltaic module, comprising an HJT cell string.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. An HJT battery string, characterized in that: It includes a battery cell (1) and a welding strip (2); the welding strip (2) is a long and flat strip, and the welding strip (2) includes a front welding section (21), a transition section (22), and a back welding section (23) connected in sequence. The front welding section (21) and the back welding section (23) are provided with welding pieces (24) and notches (25) on both sides. Adjacent welding pieces (24) are staggered, and adjacent notches (25) are staggered. The notches (25) and the welding pieces (24) are opposite to each other. The front welding section (21) is welded to the front of the first battery cell (1) through the welding pieces (24) of the section, and the back welding section (23) is welded to the back of the second battery cell (1) through the welding pieces (24) of the section.

2. The HJT battery string according to claim 1, characterized in that: The welding piece (24) is a rectangle extending outward from the body.

3. The HJT battery string according to claim 1, characterized in that: The notch (25) is an isosceles triangle and is aligned with the center of the corresponding weld piece (24).

4. The HJT battery string according to claim 1, characterized in that: The front edge of the battery cell (1) is provided with a front notch (11) and the back edge is provided with a back notch (12). The front notch (11) and the back notch (12) are symmetrical. The solder strip (2) extends from the front notch (11) of the first battery cell (1) to the back notch (12) of the second battery cell (1).

5. The HJT battery string according to claim 4, characterized in that: The thickness of the front notch (11) and the back notch (12) is less than the thickness of the battery cell (1).

6. The HJT battery string according to claim 4, characterized in that: Both the front notch (11) and the back notch (12) are curved surfaces.

7. An HJT photovoltaic module, characterized in that: Including an HJT battery string as described in any one of claims 1-6.

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