A photovoltaic module multi-fraction cell string and a slice-changing repair process thereof

Abstract

The present application relates to the field of photovoltaic technology, and more particularly to a kind of photovoltaic module multi-slice cell string and its piece-changing repair process, the multi-slice cell string is multiple pieces of overlapping placed cell piece, the welding band of the cell piece near cutting surface edge 6-7mm is not set glue point, the cell piece overlapping place is provided with flat welding band, and the glue point near cutting surface and the flat welding band are provided with reserved structure between them.By canceling the welding band glue point of the edge 6-7mm of cell piece cutting surface, the length of the reserved structure after welding band cutting can reach the size requirement of single piece repair.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, specifically to a multi-celled photovoltaic module and its cell replacement and repair process. Background Technology

[0002] The existing half-cell battery string has a standardized single-cell rework process: when replacing a defective cell, one side is cut along the outer Pad point of the defective cell, and the other side is cut along the center of the flattened position. After cutting, the length of the solder strip should not be less than 2.5mm. After replacing with a good cell, the overlap length of the weld on both sides should also be ≥2.5mm. After the rework is completed, it must meet the quality requirements of no shadows in EL inspection and no desoldering in module lamination.

[0003] This rework solution is only applicable to conventional half-cell battery strings and cannot be applied to multi-cell stacking processes. Currently, defective multi-cell strings can only be replaced as a whole string, which not only significantly increases material and manufacturing costs but also contradicts the management goal of reducing costs and increasing efficiency on-site.

[0004] The multi-cell battery string uses a negative spacing + adhesive welding process. The stacked structure makes conventional single-cell rework solutions impossible to implement, mainly due to two problems: 1. When shearing defective solar cells, the shearing pliers are prone to bumping and scratching the back of the solar cells. This damage is clearly visible in EL inspection, resulting in poor quality. 2. Due to welding process requirements, the adhesive application area is close to the edge of the battery cell, and the effective length reserved after cutting the welding strip is insufficient, which does not meet the welding conditions for single cell replacement. Summary of the Invention

[0005] The purpose of this invention is to provide a photovoltaic module multi-cell battery string and its cell replacement and repair process, which solves the technical problem that the stacked structure characteristics of multi-cell battery strings in the prior art make conventional single-cell repair solutions impossible to implement.

[0006] This invention discloses a multi-cell solar cell string for a photovoltaic module. The multi-cell solar cell string consists of multiple overlapping solar cells. No adhesive dots are provided on the solder strips of the solar cells 6-7mm from the edge of the cut surface. Flat solder strips are provided at the overlapping parts of the solar cells. A reserved structure is provided between the adhesive dots near the cut surface and the flat solder strips.

[0007] By eliminating the 6-7mm solder strip adhesive dots on the edge of the cut surface of the battery cell, the structural length reserved after cutting the solder strip can meet the size requirements for single-cell rework.

[0008] By setting flat solder strips, the bonding and contact effect between the solder strips and the fine grid of the battery cell in the glue-free area is improved.

[0009] By setting up a reserved structure, the size requirements for single-piece rework are guaranteed to be met.

[0010] Furthermore, the battery cell has a flat solder strip near the edge of the non-cut surface, and the solder strip near the edge of the cut surface is a normal solder strip.

[0011] Furthermore, the battery cell has a flat solder strip near the edge of the non-cut surface, and the battery cell also has a flat solder strip near the edge of the cut surface.

[0012] Furthermore, the solder strips near the non-cut edge of the battery cell are normal solder strips, while the solder strips near the cut edge of the battery cell are provided with flat solder strips.

[0013] Furthermore, the length of the flat solder strip is 6.5-8mm.

[0014] Furthermore, the flat solder strip has a length of 7 mm.

[0015] Furthermore, the flat welding strip has a depression in the middle and a completely flat structure at the bottom.

[0016] By setting the bottom of the flat solder strip to a completely flat structure, Minolta can achieve better contact with the solar cells.

[0017] Furthermore, the pressure of the electrode needle in the battery cell welding fixture is 0.5N-0.8N.

[0018] By adjusting the pressure of the tooling needle, the bonding effect between the solder strip and the cell grid in the area without adhesive dots can be improved.

[0019] Furthermore, the pressure of the pressure pins at both ends of the battery cell welding fixture is greater than the pressure of the pressure pin in the middle.

[0020] Furthermore, the pressure of the pressure pins at both ends of the battery cell welding fixture is 0.8N, and the pressure of the pressure pin in the middle is 0.5N.

[0021] Furthermore, the length of the reserved structure is 2mm-3mm.

[0022] Furthermore, the length of the reserved structure is 2.5mm.

[0023] Furthermore, a pull wire is installed at the battery harpoon position.

[0024] By setting a guideline, the welding shadow problem caused by removing the outer adhesive dots was solved, ultimately ensuring that the dimensional standards required for rework were met stably.

[0025] A photovoltaic module multi-cell cell string replacement and repair process is used for multi-cell cell strings with a stacked structure. Before carrying out the re-cutting operation, a protective tool is inserted into the gap between the stacked cells, and the cutting operation is performed above the protective tool.

[0026] By using protective equipment, the battery cells can be effectively protected from scratches during operation.

[0027] Furthermore, the protective tooling is a pad.

[0028] The cutting pliers rely on a pad to complete the cutting operation, which can effectively isolate the tool from the battery cell, completely avoid scratching the battery cell during the cutting process, eliminate EL test defects caused by this, and ensure the product's appearance and electrical performance quality.

[0029] Furthermore, the pad is a PET ultra-thin pad.

[0030] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves single-cell rework of multi-cell stacked battery strings through comprehensive optimization of tooling protection, adhesive application process, solder strip morphology, welding parameters and grid structure. It eliminates the need to replace the entire battery string, which significantly reduces material loss and labor costs, achieving cost reduction and efficiency improvement. It also avoids various defects caused by rework from the source, effectively improving the overall manufacturing yield of the module. Its practicality and promotion value are significant. 2. This invention eliminates the 6-7mm solder strip adhesive dots on the edge of the cut surface of the battery cell, so that the reserved structural length after the solder strip is cut can meet the size requirements for single-cell rework. 3. By setting flat solder strips, the bonding and contact effect between the solder strips and the fine grid of the battery cell in the glue-free area is improved; 4. By setting up a reserved structure, the size requirements for single-piece rework are guaranteed to be met; 5. By setting the bottom of the flat solder strip to a completely flat structure, the Minolta solar cell can make better contact with the solar cells; 6. By adjusting the pressure of the tooling needle, the bonding effect between the solder strip and the cell grid in areas without adhesive dots can be improved; 7. By setting a guideline, the welding shadow problem caused after removing the outer adhesive dots was solved, ultimately ensuring that the dimensional standards required for rework were consistently met; 8. The cutting pliers rely on the pad to complete the cutting operation, which can effectively isolate the tool from the battery cell, completely avoid scratching the battery cell during the cutting process, eliminate EL test defects caused by this, and ensure the appearance and electrical performance quality of the product. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1This is a schematic diagram of the multi-segment cell string structure of the photovoltaic module of the present invention.

[0033] Figure 2 This is a partial structural diagram of section A of the multi-segment cell string in the photovoltaic module of the present invention.

[0034] Figure 3 This is a partial structural diagram of section B of the multi-segment cell string in the photovoltaic module of the present invention.

[0035] Figure 4 This is a schematic diagram of the cross-sectional structure of the flat welding strip of the present invention.

[0036] Figure 5 This is a schematic diagram showing the state of the multi-cell battery string of the photovoltaic module of the present invention placed on the pad.

[0037] In the above attached figures, the meanings of each mark are as follows: 1-battery cell, 2-adhesive dot, 3-flat solder strip, 4-reserved structure, 5-recess, 6-battery harpoon, 7-pull-through wire, 8-pad. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] Example 1 This embodiment discloses a multi-segment cell string for a photovoltaic module, the structure of which is as follows: Figures 1-4 As shown, the multi-segment battery string consists of multiple overlapping battery cells 1. The solder strips of the battery cells 1 near the edge of the cut surface (6-7mm) do not have adhesive dots 2. Flat solder strips 3 are provided at the overlapping parts of the battery cells 1. A reserved structure 4 is provided between the adhesive dots 2 near the cut surface and the flat solder strips 3.

[0040] By eliminating the 6-7mm solder strip adhesive dots 2 on the edge of the cut surface of the battery cell 1, the length of the reserved structure 4 after the solder strip is cut can meet the size requirements for single-cell rework.

[0041] By setting a flat solder strip 3, the bonding and contact effect between the solder strip and the fine grid of the battery cell 1 in the glue-free area is improved.

[0042] By setting up reserved structure 4, the size requirements for single-piece rework are guaranteed to be met.

[0043] Example 2 This embodiment discloses a multi-segment cell string for a photovoltaic module, the structure of which is as follows: Figures 1-4As shown, the only change from Embodiment 1 is that a flat solder strip 3 is provided at the solder strip near the edge of the non-cut surface of the battery cell 1, and the solder strip near the edge of the cut surface of the battery cell 1 is a normal solder strip.

[0044] In some embodiments, a flat solder strip 3 is provided on the solder strip near the edge of the non-cut surface of the battery cell 1, and a flat solder strip 3 is also provided on the solder strip near the edge of the cut surface of the battery cell 1.

[0045] In some embodiments, the solder strips near the non-cut edge of the battery cell 1 are normal solder strips, and the solder strips near the cut edge of the battery cell 1 are provided with flat solder strips 3.

[0046] Example 3 This embodiment discloses a multi-segment cell string for a photovoltaic module, the structure of which is as follows: Figures 1-4 As shown, the only change from Embodiment 2 is that the length of the flat solder strip 3 is 7mm, the flat solder strip 3 has a recess 5 in the middle, and the bottom is a flat structure.

[0047] By setting the bottom of the flat solder strip 3 to be completely flat, Minolta can better contact the battery cell 1.

[0048] Example 4 This embodiment discloses a multi-segment cell string for a photovoltaic module, the structure of which is as follows: Figures 1-4 As shown, the only change from Example 3 is that the pressure of the two ends of the welding fixture for the battery cell 1 is 0.8N, and the pressure of the middle needle is 0.5N.

[0049] Example 5 This embodiment discloses a multi-segment cell string for a photovoltaic module, the structure of which is as follows: Figures 1-4 As shown, the only change from embodiment 4 is that the length of the reserved structure 4 is 2.5mm, and a pull wire 7 is provided at the position of the battery harpoon 6.

[0050] By setting the pull line 7, the welding shadow problem caused by the removal of the outer glue point 2 was solved, and the dimensional standards required for rework were finally stably met.

[0051] Example 6 This embodiment discloses a rework process for multi-segment cell strings in photovoltaic modules, such as... Figure 5 As shown, before performing the recutting operation using the multi-segment battery string in Example 5, a protective fixture is inserted into the gap between the stacked cells, and the cutting operation is performed above the protective fixture. The protective fixture is a pad 8, and the pad 8 is a PET ultra-thin pad 8.

[0052] By using protective tooling, the battery cell 1 can be prevented from being scratched during operation, thus achieving effective protection for the battery cell 1.

[0053] The cutting pliers rely on the pad 8 to complete the cutting operation, which can effectively isolate the tool from the battery cell 1, completely avoid scratching the battery cell 1 during the cutting process, eliminate EL test defects caused by this, and ensure the product's appearance and electrical performance quality.

[0054] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. A photovoltaic module with multi-segmented cell strings, characterized in that: The multi-segment battery string consists of multiple overlapping battery cells (1). No adhesive dots (2) are provided on the solder strip 6-7mm from the edge of the cut surface of the battery cell (1). Flat solder strips (3) are provided at the overlapping part of the battery cell (1). A reserved structure (4) is provided between the adhesive dots (2) near the cut surface and the flat solder strips (3).

2. The photovoltaic module multi-segment cell string according to claim 1, characterized in that: The battery cell (1) has a flat solder strip (3) near the edge of the non-cut surface, and the solder strip near the edge of the cut surface of the battery cell (1) is a normal solder strip; And / or, the battery cell (1) is provided with a flat solder strip (3) near the edge of the non-cut surface, and the solder strip of the battery cell (1) near the edge of the cut surface is also provided with a flat solder strip (3); And / or, the solder strips of the battery cell (1) near the edge of the non-cut surface are normal solder strips, and the solder strips of the battery cell (1) near the edge of the cut surface are provided with flat solder strips (3).

3. The photovoltaic module multi-segment cell string according to claim 1, characterized in that: The flat welding strip (3) has a length of 6.5-8 mm.

4. A photovoltaic module with multi-segmented cell strings according to claim 1, characterized in that: The flat welding strip (3) has a depression (5) in the middle and a flat bottom.

5. A photovoltaic module with multi-segmented cell strings according to claim 1, characterized in that: The pressure of the welding tooling for the battery cell (1) is 0.5N-0.8N.

6. A photovoltaic module with multi-segmented cell strings according to claim 1, characterized in that: The pressure of the pressure pins at both ends of the welding fixture for the battery cell (1) is greater than the pressure of the pressure pin in the middle.

7. A photovoltaic module with multi-segmented cell strings according to claim 1, characterized in that: The length of the reserved structure (4) is 2mm-3mm.

8. A photovoltaic module with multi-segmented cell strings according to claim 1, characterized in that: A pull wire (7) is provided at the position of the battery harpoon (6).

9. A process for replacing cells in a multi-cell photovoltaic module, characterized in that: When performing rework on a multi-cell photovoltaic module using any one of claims 1-8, before carrying out the rework trimming operation, a protective fixture is inserted into the gap between the cells, and the cutting operation is performed above the protective fixture.

10. The photovoltaic module multi-cell cell string replacement and repair process according to claim 9, characterized in that: The protective tooling is a pad (8).

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