Solder strip folding type photovoltaic module

Abstract

The utility model relates to a welding strip folding type photovoltaic module, which comprises battery pieces, and adjacent battery pieces are connected through a welding strip along the main grid direction of the battery pieces to form a battery piece string. A welding strip led out from one end of the battery piece string is a positive electrode and is connected through a positive electrode bus bar; the welding strips led out from the other ends of the battery piece strings are cathodes and are connected through a cathode bus bar, and the welding strips at the two ends of the battery piece strings are bent by 180 degrees, so that the anode bus bar and the cathode bus bar are positioned on the back surfaces of the battery pieces; the part, bent to the back face of the battery piece, of the welding strip is separated from the back face of the battery piece through an insulating filler strip, or the parts, bent to the back face of the battery piece, of the welding strip are separated through insulating filler strips. According to the arrangement, the front power generation area of the photovoltaic module is increased, and the efficiency of the photovoltaic module is improved; the design and the use of the bus bar are more flexible, the bus bar with enough sectional area can be used for converging, the electron collection capability can be improved to a certain extent, and the assembly power and the assembly efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of solar photovoltaic module technology, specifically a folded-over photovoltaic module with solder strips. Background Technology

[0002] With the rapid development of photovoltaic technology, improving the power output and efficiency of photovoltaic cells has become a crucial research direction in the industry. Optimizing the internal structure design of the module without changing the size of the photovoltaic cells is one of the key means to improve performance. Currently, mainstream technologies increase the effective power generation area of ​​the cells and thus improve the module's power density by reducing the spacing between cells (such as zero-pitch or negative-pitch) and compressing the width of the busbars. However, this design has the following drawbacks:

[0003] 1. The reduction in cell spacing or the compression of busbar size makes the module more susceptible to mechanical stress during production, transportation and installation, which can lead to microcracks or cell breakage, reducing the reliability and service life of the module.

[0004] 2. Current mainstream half-cell modules use a series-parallel circuit design, requiring an additional busbar between the two parallel series to collect current. This not only increases the module's resistance loss but also reduces the effective light-receiving area, affecting the overall conversion efficiency of the photovoltaic module.

[0005] Therefore, how to reduce the risk of microcracks and optimize busbar design while ensuring high power density and power generation efficiency of modules has become a key issue that urgently needs to be addressed in the field of photovoltaic technology. Current technologies have not yet provided an optimized solution that can both achieve high energy output and improve module reliability, necessitating innovative structural designs or process improvements. Utility Model Content

[0006] To address the technical problems in the background art, this utility model discloses a folded photovoltaic module with a welding strip.

[0007] This utility model provides a folded-strip photovoltaic module, including solar cells. Along the main grid direction of the solar cells, adjacent solar cells are connected by solder strips to form a solar cell string. The solder strip leading out from one end of the solar cell string is the positive electrode and is connected by a positive electrode busbar. The solder strip leading out from the other end of the solar cell string is the negative electrode and is connected by a negative electrode busbar. The solder strips at both ends of the solar cell string are bent at 180° so that the positive electrode busbar and the negative electrode busbar are located on the back of the solar cells.

[0008] The portion of the solder ribbon bent to the back of the cell is separated from the back of the cell by an insulating strip, or the portions of the solder ribbon bent to the back of the cell are separated by an insulating strip.

[0009] Its specific structure is as follows: the welding strip connecting the positive electrode busbar is located on the front side of the battery cell. When this welding strip is bent, it forms a positive electrode U-shaped groove, and the side of the battery cell is snapped into the positive electrode U-shaped groove; the pad is also located in the U-shaped groove and is sandwiched between the welding strip and the back of the battery cell; the welding strip connecting the negative electrode busbar is bent away from the battery cell to form a negative electrode U-shaped groove, and the pad is snapped into the negative electrode U-shaped groove, with its two sides connected to the groove wall of the negative electrode U-shaped groove.

[0010] Furthermore, the pad has a through hole along its length; the end of the welding strip protrudes from the through hole.

[0011] Furthermore, the bent portion of the welding strip is bonded to the padding strip.

[0012] Furthermore, the perforation is biased towards one side of the pad, dividing the pad into two parts, one large and one small; the welding strip is used to snap onto the wider part of the pad.

[0013] Furthermore, the middle partition of the cell string divides the cell string into an upper cell string and a lower cell string; the upper cell string has an upper solder strip leading downwards; the lower cell string has a lower solder strip leading upwards; the upper and lower solder strips have the same polarity and are staggered relative to each other; the solder strips at both ends of the cell string have the same polarity; the middle busbar connecting the upper or lower solder strips is located on the back of the cell.

[0014] The central busbar has three installation structures: First, the upper solder strip passes through the perforation and bends 180° in the opposite direction; the central busbar is located on the back of the upper cell string; the lower solder strip passes through the perforation and connects to the central busbar. Second, the lower solder strip passes through the perforation and bends 180° in the opposite direction; the central busbar is located on the back of the lower cell string; the upper solder strip passes through the perforation and connects to the central busbar. Third, the upper solder strip passes through the perforation and bends 180° in the opposite direction; the lower solder strip passes through the perforation and bends 180° in the opposite direction; the central busbar is located on the back of both the upper and lower cell strings, extending to the same length as both strings.

[0015] Furthermore, the perforation is located at the center of the pad.

[0016] The beneficial effects of this utility model are: 1. The design of the photovoltaic module without busbars on the front increases the power generation area of ​​the photovoltaic module and improves the efficiency of the photovoltaic module; 2. The design and use of busbars are more flexible, and busbars with sufficient cross-sectional area can be used for current collection, which can increase the electron collection capacity to a certain extent, thereby improving the module power and module efficiency. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a front view of the present invention;

[0019] Figure 2 This is a back view of the present invention;

[0020] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 yes Figure 3 Side view;

[0022] Figure 5 yes Figure 2 Enlarged view at point B in the middle;

[0023] Figure 6 yes Figure 5 Side view;

[0024] Figure 7 This is a view of the back of the partition in the middle of the photovoltaic module;

[0025] Figure 8 yes Figure 7 The side view at point C corresponds to Embodiment 3;

[0026] Figure 9 yes Figure 7 The side view at point C corresponds to Embodiment 4;

[0027] Figure 10 yes Figure 7 The side view at point C corresponds to Embodiment 5;

[0028] Figure 11 yes Figure 7 The side view at point C corresponds to Embodiment Six;

[0029] Figure 12 yes Figure 7 The side view at point C corresponds to Embodiment Seven;

[0030] Figure 13 yes Figure 7 The side view at point C corresponds to Embodiment 8;

[0031] In the diagram: 1. Battery cell; 2. Welding ribbon; 3. Positive busbar; 4. Negative busbar; 5. Positive U-shaped groove; 6. Negative U-shaped groove; 7. Upper battery cell string; 8. Lower battery cell string; 9. Upper welding ribbon; 10. Lower welding ribbon; 11. Middle busbar; 12. Spacer strip; 13. Perforation. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0033] Example 1:

[0034] like Figure 1 and Figure 2 As shown, this utility model discloses a foldable photovoltaic module with solder strips, including a cell 1. Along the main grid direction of the cell 1, adjacent cells 1 are connected by solder strips 2 to form a cell string. The solder strip 2 leading out from one end of the cell string is the positive electrode and is connected by a positive electrode busbar 3. The solder strip 2 leading out from the other end of the cell string is the negative electrode and is connected by a negative electrode busbar 4.

[0035] like Figure 3 and Figure 4 As shown, in this embodiment, the solder strip 2 connecting the positive electrode busbar 3 is located on the front side of the battery cell 1. This solder strip 2 is bent 180° to form a positive U-shaped groove 5, and the side of the battery cell 1 is snapped into the positive U-shaped groove 5; the insulating pad 12 is also located in the positive U-shaped groove 5, and is sandwiched between the solder strip 2 and the back side of the battery cell 1. Figure 5 and Figure 6 As shown, the solder strip 2 connecting the negative electrode busbar 4 is bent 180° away from the battery cell 1 to form a negative electrode U-shaped groove 6. The spacer strip 12 is snapped into the negative electrode U-shaped groove 6, and its two sides are connected to the groove wall of the negative electrode U-shaped groove 6. The spacer strip 12 consists of a layer of EVA and a layer of PET, with the thickness controlled within 150μm. EVA can play a good buffering role and can prevent the battery cell 1 from breaking during pressure.

[0036] The above arrangement positions the positive busbar 3 and the negative busbar 4 on the back of the solar cell 1. The position of the spacer strip 12 is designed to prevent short circuits in the photovoltaic module.

[0037] The spacer strip 12 has a through hole 13 along its length; the end of the welding strip 2 passes through the through hole 13, and the bent part of the welding strip 2 is in contact with the spacer strip 12. This design not only improves the stability of the connection structure between the welding strip 2 and the spacer strip 12, but also makes the operation simpler by folding the welding strip 2 around the outer side of the spacer strip 12.

[0038] In this embodiment, the width of the perforation 13 is 2-3mm, and the perforation 13 is biased towards one side of the pad 12, dividing the pad 12 into two parts, one large and one small. The distance between the perforation 13 and the narrower side of the pad 12 is 3-5mm, and the welding strip 2 is engaged with the wider part of the pad 12. With this arrangement, the contact area between the welding strip 2 and the pad 12 is larger, and the connection structure is more stable.

[0039] Compared with existing technologies, the advantages of this embodiment are: 1. The design of the photovoltaic module without busbars on the front increases the power generation area of ​​the photovoltaic module and improves the efficiency of the photovoltaic module; 2. The design and use of busbars are more flexible, and busbars with sufficient cross-sectional area can be used for current collection, which can increase the electron collection capacity to a certain extent, thereby improving the module power and module efficiency.

[0040] Example 2:

[0041] Compared with Embodiment 1, the difference is as follows: the welding strip 2 connecting the negative electrode busbar 4 is located on the front side of the battery cell 1. This welding strip 2 is bent 180° to form a negative electrode U-shaped groove 6, and the side of the battery cell 1 is snapped into the negative electrode U-shaped groove 6; the insulating pad 12 is also located in the negative electrode U-shaped groove 6, and is sandwiched between the welding strip 2 and the back side of the battery cell 1; the welding strip 2 connecting the positive electrode busbar 3 is bent 180° away from the battery cell 1 to form a positive electrode U-shaped groove 5, and the pad 12 is snapped into the positive electrode U-shaped groove 5, with its two sides connected to the groove wall of the positive electrode U-shaped groove 5.

[0042] Example 3:

[0043] The difference compared to Embodiment 1 or Embodiment 2 is as follows: Figure 7 and Figure 8 As shown, the middle section of the cell string divides it into an upper cell string 7 and a lower cell string 8 connected in parallel. An upper solder strip 9 extends from the upper cell string 7 towards the lower cell string 8; a lower solder strip 10 extends from the lower cell string 8 towards the upper cell string 7. The upper solder strip 9 and the lower solder strip 10 have the same polarity and can be either positive or negative. The solder strips 2 at both ends of the cell string also have the same polarity. The upper solder strip 9 and the lower solder strip 10 are staggered and not on the same straight line. The middle busbar 11 connecting the upper solder strip 9 or the lower solder strip 10 is located on the back of the cell 1.

[0044] Both the upper welding strip 9 and the lower welding strip 10 are located on the front side of the battery cell 1. The upper welding strip 9 passes through the perforation 13 and bends 180° in the opposite direction to the back side of the upper battery cell string 7. The wider part of the pad strip 12 is snapped into the welding strip 2. The lower welding strip 10 extends obliquely from the front side of the lower battery cell string 8 to the back side of the lower battery cell string 8, passes through the perforation 13, and connects with the middle busbar 11.

[0045] Example 4:

[0046] The difference compared to Example 3 is as follows: Figure 7 and Figure 9 As shown, the lower solder strip 10 passes through the perforation 13 and bends 180° in the opposite direction to the back of the lower battery cell string 8. The wider part of the pad strip 12 is snapped into the solder strip 2. The upper solder strip 9 extends obliquely from the front of the upper battery cell string 7 to the back of the lower battery cell string 8 and passes through the perforation 13 to connect with the middle busbar 11.

[0047] Example 5:

[0048] The difference compared to Example 3 is as follows: Figure 7 and Figure 10 As shown, the upper solder strip 9 passes through the perforation 13 and is bent 180° in the opposite direction to the back of the upper battery cell string 7; the lower solder strip 10 passes through the perforation 13 and is bent 180° in the opposite direction to the back of the lower battery cell string 8.

[0049] The perforation 13 is located at the center of the pad strip 12. The central busbar 11 is located on the back side of the upper battery cell string 7 and the lower battery cell string 8, and extends to the same length as the upper battery cell string 7 and the lower battery cell string 8.

[0050] Example 6:

[0051] The difference compared to Example 3 is as follows: Figure 7 and Figure 11 As shown, the upper welding strip 9 and the lower welding strip 10 are both located on the back of the battery cell 1. The upper welding strip 9 passes through the perforation 13 and is bent 180° in the opposite direction. The wider part of the pad strip 12 is snapped into the welding strip 2. The lower welding strip 10 extends to the back of the lower battery cell string 8 and passes through the perforation 13 to connect with the middle busbar 11.

[0052] Example 7:

[0053] The difference from Example 6 is as follows: Figure 7 and Figure 12 As shown, the lower solder strip 10 passes through the perforation 13 and is bent 180° in the opposite direction. The wider part of the pad strip 12 is snapped into the solder strip 2. The upper solder strip 9 extends to the back of the upper battery cell string 7 and passes through the perforation 13 to connect with the middle busbar 11.

[0054] Example 8:

[0055] The difference from Example 6 is as follows: Figure 7 and Figure 13 As shown, the upper solder strip 9 passes through the perforation 13 and bends 180° in the opposite direction, and the lower solder strip 10 passes through the perforation 13 and bends 180° in the opposite direction. The perforation 13 is located at the center of the pad strip 12. The middle busbar 11 extends to the same length as the upper battery cell string 7 and the lower battery cell string 8.

[0056] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A foldable photovoltaic module with solder strips, comprising solar cells (1), adjacent solar cells (1) are connected by solder strips (2) along the main grid direction of the solar cells (1) to form a solar cell string; the solder strip (2) leading out from one end of the solar cell string is the positive electrode and is connected by a positive electrode busbar (3); the solder strip (2) leading out from the other end of the solar cell string is the negative electrode and is connected by a negative electrode busbar (4), characterized in that: The solder strips (2) at both ends of the battery cell string are bent 180° so that the positive busbar (3) and the negative busbar (4) are located on the back of the battery cell (1). The portion of the welding strip (2) bent to the back of the battery cell (1) is separated from the back of the battery cell (1) by an insulating pad (12), or the portions of the welding strip (2) bent to the back of the battery cell (1) are separated by an insulating pad (12).

2. The folded-over photovoltaic module according to claim 1, characterized in that: The solder strip (2) connecting the positive electrode busbar (3) is located on the front side of the battery cell (1). When the solder strip (2) is bent, it forms a positive electrode U-shaped groove (5). The side of the battery cell (1) is snapped into the positive electrode U-shaped groove (5). The pad strip (12) is also located in the positive electrode U-shaped groove (5) and is sandwiched between the solder strip (2) and the back side of the battery cell (1). The welding strip (2) connecting the negative electrode busbar (4) is bent away from the battery cell (1) to form a negative electrode U-shaped groove (6). The pad strip (12) is snapped into the negative electrode U-shaped groove (6), and its two sides are connected to the groove wall of the negative electrode U-shaped groove (6).

3. The folded-over photovoltaic module according to claim 2, characterized in that: The pad strip (12) has a through hole (13) along its length; The end of the welding strip (2) passes through the perforation (13).

4. A folded-over photovoltaic module according to claim 3, characterized in that: The bent portion of the welding strip (2) is attached to the pad strip (12).

5. A folded-over photovoltaic module according to claim 4, characterized in that: The perforation (13) is biased toward one side of the pad (12), dividing the pad (12) into two parts, one large and one small; The welding strip (2) is attached to the wider part of the pad strip (12).

6. A folded-over photovoltaic module according to claim 1, characterized in that: The middle partition of the battery cell string divides the battery cell string into an upper battery cell string (7) and a lower battery cell string (8); The upper battery cell string (7) extends an upper solder strip (9) in the direction of the lower battery cell string (8); The lower battery cell string (8) extends a lower solder strip (10) towards the upper battery cell string (7); The upper solder strip (9) and the lower solder strip (10) have the same polarity and are relatively staggered; The solder strips (2) at both ends of the battery cell string have the same polarity; The middle busbar (11) connecting the upper solder strip (9) or the lower solder strip (10) is located on the back of the battery cell (1).

7. A folded-over photovoltaic module according to claim 6, characterized in that: The upper welding strip (9) passes through the perforation (13) and is bent 180° in the opposite direction; The central busbar (11) is located on the back of the upper battery cell string (7); The lower welding strip (10) passes through the perforation (13) and connects to the central busbar (11).

8. A folded-over photovoltaic module according to claim 6, characterized in that: The lower welding strip (10) passes through the perforation (13) and is bent 180° in the opposite direction; The central busbar (11) is located on the back of the lower battery cell string (8); The upper welding strip (9) passes through the perforation (13) and connects to the central busbar (11).

9. A folded-over photovoltaic module according to claim 6, characterized in that: The upper welding strip (9) passes through the perforation (13) and is bent 180° in the opposite direction; The lower welding strip (10) passes through the perforation (13) and is bent 180° in the opposite direction; The central busbar (11) is located on the back side of the upper battery cell string (7) and the lower battery cell string (8), and extends to the same length as the upper battery cell string (7) and the lower battery cell string (8).

10. A folded-over photovoltaic module according to claim 9, characterized in that: The perforation (13) is located at the center of the pad (12).

Images