Battery string and photovoltaic module

Abstract

A battery string and a photovoltaic module, belonging to the technical field of photovoltaic modules. The battery string comprises: a first connection wire, and a first cell and a second cell which are electrically connected by means of the first connection wire. The first connection wire extends in a first direction on a first surface of the first cell. The first cell has a first edge and a second edge which are opposite in the first direction; and the first surface of the first cell is provided with a first end wire extending in the first direction, the first end wire being close to the first edge and far away from the second edge. Part of the first connection wire extends onto the first end wire to form an overlap portion, the ratio of the length of the overlap portion to the length of the first end wire being less than or equal to 80%.

Description

Battery string and photovoltaic module

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 22, 2023, with application number 202311061413.6 and invention name “A battery string and photovoltaic module”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of photovoltaic modules, and in particular to a battery string and a photovoltaic module. Background Art

[0003] A cell string, the core component of a photovoltaic module, converts solar energy into electricity. Typically, a cell string consists of multiple cells arranged in sequence. The cell surfaces are equipped with a main grid and fine grids, which collect the current generated by the cells. The main grid and fine grids are cross-connected, and the current collected by the fine grids is collected by the main grid to aggregate the current generated by the cells.

[0004] During the processing of the battery string, the slurry is usually printed on the surface of the battery cell by screen printing to form multiple fine grids and multiple main grids that are perpendicular to each other on the surface of the battery cell. The current generated by the battery cell is collected and aggregated by the multiple fine grids and multiple main grids in order to collect the current generated by the entire battery cell. However, setting multiple main grids and multiple fine grids on the surface of the battery cell requires a large amount of slurry, which increases the cost of the battery cell. In addition, the fine grids and main grids will block the upper surface of the battery cell, affecting the efficiency of the upper surface of the battery cell in absorbing light, thereby affecting the photoelectric conversion efficiency of the battery cell.

[0005] In related technologies, in order to reduce the production cost of solar cells and improve the photovoltaic conversion efficiency of solar cells, only fine grids are provided on the surface of the solar cells, and welding ribbons are placed at the main grid position. The welding ribbons connect the fine grids and the current collected by the fine grids is aggregated.

[0006] However, since the soldering ribbon cannot cover the entire surface of the cell along its extension direction, the fine grids on both sides of the cell surface may not be connected to the soldering ribbon along its extension direction, resulting in the current collected by some fine grids being unable to be collected on the soldering ribbon, affecting the photoelectric conversion efficiency of the cell.

[0007] Summary of the Invention

[0008] The purpose of this application is to provide a battery string and a photovoltaic module.

[0009] Specifically, this application involves the following aspects:

[0010] In a first aspect, the present application discloses a battery string, comprising: a first connecting line and a first battery cell and a second battery cell electrically connected by the first connecting line, wherein the first connecting line extends along a first direction on a first surface of the first battery cell, and the first battery cell has a first edge and a second edge relative to each other along the first direction; a first terminal line extending along the first direction is provided on the first surface of the first battery cell, the first terminal line is close to the first edge and away from the second edge; a portion of the first connecting line extends to the first terminal line to form an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first terminal line is less than or equal to 80%.

[0011] Optionally, the length of the overlapping portion accounts for 40% to 80% of the length of the first end line.

[0012] Optionally, there are multiple first connecting wires and multiple first terminal wires, and the first connecting wires and the first terminal wires are arranged in a one-to-one correspondence.

[0013] Optionally, the first surface of the first battery cell is further provided with a plurality of fine grids extending along a second direction and spaced apart along the first direction; wherein the second direction intersects with the first direction; the first end line only connects a portion of the plurality of fine grids close to the first edge, and the first end line connects the fine grid closest to the first edge.

[0014] Optionally, a bonding layer is provided on the first connection line, and the first connection line is connected to at least a portion of the fine grid through the bonding layer.

[0015] Optionally, the first connecting wire is fixed to the first surface of the first battery cell by a plurality of discrete glue points.

[0016] Optionally, the length of the first terminal line is less than 1 / 4 of the projected length of the first connecting line on the first battery cell.

[0017] Optionally, the first surface of the first battery cell further includes a second terminal line close to the second edge, and the second terminal line is completely covered by the first connecting line.

[0018] Optionally, along the first direction, a distance between an end portion of the first connecting line and a first edge of the first battery cell is greater than or equal to 3 mm and less than or equal to 8.75 mm.

[0019] Optionally, only one glue point is set in the overlapping part, and the glue point is the first glue point; along the first direction, the distance between the first glue point and the first edge is the third distance, and the distance between the end of the first connecting line and the first edge is the fourth distance; wherein, the difference between the third distance and the fourth distance is greater than or equal to 2 mm.

[0020] Optionally, along the second direction, the length of the first battery cell and the second battery cell is greater than or equal to 180 mm and less than or equal to 240 mm.

[0021] Optionally, the sizes of the first battery cell and the second battery cell include: (182±2)mm*(96±1)mm, (192±2)mm*(91±1)mm, (182±2)mm*(91±1)mm, (182±2)mm*(105±1)mm mm.

[0022] In a second aspect, the present application discloses a battery string, comprising: a first connecting line and a first battery cell and a second battery cell electrically connected by the first connecting line, wherein the first connecting line is fixed to the first surface of the first battery cell by a plurality of discrete glue points, the first connecting line extends along a first direction, and the first battery cell has a first edge and a second edge relative to each other in the first direction; a first end line extending along the first direction is provided on the first surface of the first battery cell, the first end line is close to the first edge and away from the second edge; a portion of the first connecting line extends to the end line to form an overlapping portion, and only one glue point is provided on the overlapping portion, the glue point is a first glue point, the distance between the first glue point and the end of the first end line close to the first edge is a first distance, and the distance between the first glue point and the end of the first end line away from the first edge is a second distance, wherein the ratio of the first distance to the second distance is 1:5 to 2:1.

[0023] Optionally, the first surface of the first battery cell further includes a second terminal line close to the second edge, and the second terminal line is completely covered by the first connecting line.

[0024] Optionally, at least one glue point is provided on the second end line.

[0025] Optionally, both ends of the first terminal line are respectively connected to two fine grids, and a first thickened section is provided at the connection with the two fine grids, and the first terminal line is electrically connected to the fine grids through the first thickened section.

[0026] Optionally, the first battery cell also includes a second surface arranged opposite to the first surface, and the battery string also includes a second connecting line connected to the second surface; the second connecting line is connected to the second surface of the first battery cell through a plurality of discrete glue points; wherein the projections of the plurality of glue points on the first surface on the first battery cell and the projections of the plurality of glue points on the second surface on the first battery cell are staggered.

[0027] Optionally, along the first direction, the distance between the first glue point and the first edge is a third distance, and the distance between the end of the first connecting line and the first edge is a fourth distance; wherein the difference between the third distance and the fourth distance is greater than or equal to 2 mm.

[0028] In a third aspect, the present application discloses a photovoltaic module, comprising a cover plate, a first adhesive layer, a plurality of battery strings described in the first aspect or the second aspect, a second adhesive layer, and a back plate arranged in sequence, wherein the plurality of battery strings are arranged at intervals.

[0029] The present application provides a battery string and a photovoltaic module, the battery string comprising: a first connecting wire and a first and second battery cells electrically connected by the first connecting wire, wherein the first connecting wire extends along a first direction on a first surface of the first battery cell, the first battery cell having a first edge and a second edge opposite each other along the first direction; a first termination wire extending along the first direction is provided on the first surface of the first battery cell, the first termination wire being close to the first edge and away from the second edge; a portion of the first connecting wire extending onto the first termination wire forms an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first termination wire is less than or equal to 80%. In an embodiment of the present application, the battery string comprises a first termination wire extending along the first direction on the first surface of the first battery cell, the first termination wire being close to the first edge of the first battery cell and away from the second edge; a first connecting wire extending along the first direction on the first surface of the first battery cell, a portion of the first connecting wire extending onto the first termination wire forms an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first termination wire is less than or equal to 80%. Thus, the first termination wire can collect current generated in the region of the first battery cell near the first edge, thereby improving the photovoltaic conversion efficiency of the battery cell.

[0030] Furthermore, through the above arrangement, the current collected by the fine grid around the first edge can be fully collected, while ensuring that the first connecting line does not extend beyond the first edge of the first battery cell, causing a short circuit in the battery string.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a structural schematic diagram 1 showing the first surface of the first battery cell in an embodiment of the present application;

[0034] FIG2 shows a partial enlarged view AA of the first battery cell in the embodiment of the present application;

[0035] FIG3 shows a second structural diagram of the first surface of the first battery cell in an embodiment of the present application;

[0036] FIG4 shows a partial enlarged view BB of the first battery cell in the embodiment of the present application;

[0037] FIG5 is a schematic structural diagram of the first bold segment in an embodiment of the present application;

[0038] FIG6 is a schematic structural diagram of the second surface of the first battery cell in an embodiment of the present application;

[0039] FIG7 shows a cross-sectional view 1 of the photovoltaic module according to an embodiment of the present application;

[0040] FIG8 shows a second cross-sectional view of the photovoltaic module according to an embodiment of the present application.

[0041] Figure numerals: 10: first battery cell; 11: first surface; 12: second surface; 13: first edge; 14: second edge; 20: fine grid; 30: first connecting line; 31: bonding layer; 40: first terminal line; 41: second terminal line; 50: glue point; 51: first glue point; 60: first thickened section; 70: cover plate; 71: first glue layer; 711: EVA layer; 712: POE layer; K: first direction; H: second direction. Specific embodiments

[0042] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] Referring to Figure 1, a structural schematic diagram 1 of the first surface of the first battery cell in an embodiment of the present application is shown; referring to Figure 2, a local enlarged view AA of the first battery cell in an embodiment of the present application is shown; referring to Figure 3, a structural schematic diagram 2 of the first surface of the first battery cell in an embodiment of the present application is shown; referring to Figure 4, a local enlarged view BB of the first battery cell in an embodiment of the present application is shown; referring to Figure 5, a structural schematic diagram of the first bold segment in an embodiment of the present application is shown; and referring to Figure 6, a structural schematic diagram of the second surface of the first battery cell in an embodiment of the present application is shown.

[0044] As shown in Figures 1 to 4, an embodiment of the present application provides a battery string, comprising: a first connecting wire 30, and a first battery cell 10 and a second battery cell electrically connected by the first connecting wire 30. The first connecting wire 30 extends along a first direction K on a first surface 11 of the first battery cell 10, and the first battery cell 10 has a first edge 13 and a second edge 14 opposite each other along the first direction K. A first terminal wire 40 extending along the first direction K is provided on the first surface 11 of the first battery cell 10, and the first terminal wire 40 is close to the first edge 13 and away from the second edge 14. A portion of the first connecting wire 30 extends onto the first terminal wire 40 to form an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first terminal wire 40 is less than or equal to 80%. This ensures sufficient current collection for the fine grid at the edge, while ensuring that the solder ribbon does not extend beyond the edge of the battery cell and cause a short circuit. Preferably, the length of the overlapping portion accounts for 40% to 80% of the length of the first terminal wire 40.

[0045] The battery string disclosed in the embodiment of the present application is configured by providing a first terminal line 40 extending along a first direction K on the first surface 11 of the first battery cell 10, and the first terminal line 40 is close to the first edge 13 of the first battery cell 10 and away from the second edge 14. The first connecting line 30 extends along the first direction K on the first surface 11 of the first battery cell 10, and a portion of the first connecting line 30 is extended to the first terminal line 40 to form an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first terminal line 40 is less than or equal to 80%. Thus, the current generated in the area near the first edge 13 of the first battery cell 10 can be collected by the first terminal line 40 to improve the photoelectric conversion efficiency of the battery cell. Furthermore, through the above-mentioned configuration, the current collected by the fine grid 20 around the first edge 13 can be fully collected, and at the same time, it can be ensured that the first connecting line 30 does not extend out of the first edge 13 of the first battery cell 10, causing a short circuit in the battery string.

[0046] Optionally, the length of the overlapping portion accounts for 40% to 80% of the length of the first terminal line 40 .

[0047] An embodiment of the present application provides a battery string, comprising a first battery cell 10 and a second battery cell spaced apart from each other, with a first gap between the first battery cell 10 and the second battery cell. The first battery cell 10 and the second battery cell each comprise a first surface and a second surface disposed opposite each other, with the first surface 11 of the first battery cell 10 and the first surface of the second battery cell oriented in the same direction.

[0048] The first battery cell 10 has a first edge 13 and a second edge 14 opposite to each other along the first direction K. A first terminal line 40 extending along the first direction K is provided on the first surface 11 of the first battery cell 10 . The first terminal line 40 is close to the first edge 13 and away from the second edge 14 .

[0049] As shown in Figure 3, the first connecting wire 30 extends along the first surface 11 of the first cell 10 in a first direction K. A portion of the first connecting wire 30 extends onto the first terminal line 40 and overlaps with the first terminal line 40. The overlapping portion accounts for 40% to 80% of the length of the first terminal line 40. The other end of the first connecting wire 30 extends to the second edge 14 of the first cell 10 and passes through the first gap to connect to the second surface of the second cell. Thus, the first cell 10 and the second cell are electrically connected via the first connecting wire 30.

[0050] For example, the length of the overlapping portion of the first connecting line 30 and the first terminal line 40 can account for 40%, 50%, 60%, 70%, 80%, etc. of the length of the first terminal line 40. This application does not impose any specific restrictions on this, and in actual use, technicians can set it as needed.

[0051] It should be noted that both the first connecting wire 30 and the first terminal wire 40 in the embodiment of the present application are electrically conductive. The first connecting wire 30 may be a welding ribbon, welding rod, or the like. Alternatively, a metal paste may be screen-printed onto the first surface 11 of the first cell 10 near the first edge 13 to form the first terminal wire 40 on the first surface 11 of the first cell 10.

[0052] Of course, the above is merely an example of the first connecting wire 30 and one method of forming the first terminal wire 40, and is not intended to limit the present application. In actual use, technicians can select an appropriate first connecting wire 30 as needed, and at the same time, select an appropriate method to place the first terminal wire 40 on the first surface 11 of the first battery cell 10 as needed.

[0053] The battery string provided in the embodiments of the present application is configured by disposing a first terminal line 40 extending along a first direction K on the first surface 11 of the first battery cell 10, with the first terminal line 40 being close to the first edge 13 of the first battery cell 10 and away from the second edge 14. A first connecting line 30 extends along the first direction K on the first surface 11 of the first battery cell 10, with a portion of the first connecting line 30 extending onto the first terminal line 40 to form an overlapping portion, with the length of the overlapping portion accounting for 40% to 80% of the length of the first terminal line 40. This allows the first terminal line 40 to collect current generated in the area of ​​the first battery cell 10 near the first edge 13, thereby improving the photovoltaic conversion efficiency of the battery cell.

[0054] As an optional implementation, as shown in FIG. 1 and FIG. 3 , there are multiple first connecting wires 30 and multiple first terminal wires 40 , and the first connecting wires 30 and the first terminal wires 40 are arranged in a one-to-one correspondence.

[0055] In the embodiment of the present application, as shown in Figures 1 and 3 , multiple first connection wires 30 and multiple first terminal wires 40 are provided, and each first connection wire 30 is provided corresponding to a first terminal wire 40. Current generated in the area of ​​the first battery cell 10 near the first edge 13 is collected by the multiple first terminal wires 40 and the collected current is conducted to the corresponding first connection wires 30.

[0056] As an optional embodiment, as shown in Figures 1 to 4, the first surface 11 of the first battery cell 10 is further provided with a plurality of fine grids 20 extending along the second direction H and spaced apart along the first direction K; wherein the second direction H intersects with the first direction K; the first end line 40 only connects a portion of the plurality of fine grids 20 close to the first edge 13, and the first end line 40 connects the fine grid 20 closest to the first edge 13.

[0057] In the embodiment of the present application, as shown in Figures 1 to 4 , a plurality of fine grids 20 extending along the second direction H and spaced apart along the first direction K are further provided on the first surface 11 of the first cell 10. The plurality of fine grids 20 can collect the current generated on the first surface 11 of the first cell 10.

[0058] The second direction H intersects the first direction K. Specifically, the second direction H may be perpendicular to the first direction K. That is, each first connection line 30 is cross-connected with a plurality of fine grids 20 , so that the current generated by the plurality of fine grids 20 can be collected through the first connection line 30 , thereby collecting the current generated on the first surface 11 of the first solar cell 10 .

[0059] To prevent the first connecting wire 30 from electrically connecting to other connecting wires, which could cause a short circuit in the battery string, a gap is provided between the first connecting wire 30 and the first edge 13 of the first surface 11 of the first battery cell 10. The first connecting wire 30 cannot extend to the first edge 13 of the first surface 11 of the first battery cell 10. Therefore, multiple first terminal wires 40 are provided on the side of the first surface 11 of the first battery cell 10 near the first edge 13. The first terminal wires 40 connect to a portion of the fine grids 20 near the first edge 13, and the first terminal wires 40 connect to the fine grids 20 closest to the first edge 13. The first terminal wires 40 collect the current generated by the portion of the fine grids 20 near the first edge 13 through the first terminal wires 40. The collected current is then conducted to the corresponding first connecting wires 30, thereby improving the photovoltaic conversion efficiency of the battery cell.

[0060] As an optional embodiment, as shown in FIG. 7 , a bonding layer 31 is provided on the first connection line 30 , and the first connection line 30 is connected to at least a portion of the fine gate 20 through the bonding layer 31 .

[0061] In the embodiment of the present application, as shown in FIG7 , a bonding layer 31 is provided on the first connecting line 30. The bonding layer 31 is conductive, and the first connecting line 30 is connected to at least a portion of the fine gate 20 through the bonding layer 31, so that the portion of the fine gate 20 and the first connecting line 30 are electrically connected, and the current collected by the portion of the fine gate 20 is collected by the first connecting line 30.

[0062] For example, when the first connection line 30 is a soldering ribbon, the bonding layer 31 may be a tin layer, and the soldering ribbon is connected to at least a portion of the tin layer through the tin layer.

[0063] Of course, in the embodiment of the present application, there is no specific limitation on the first connecting line 30 and the bonding layer 31. In actual use, technicians can select appropriate first connecting line 30 and bonding layer 31 as needed.

[0064] As an optional embodiment, as shown in FIG. 1 and FIG. 3 , the first connecting wire 30 is fixed to the first surface 11 of the first battery cell 10 through a plurality of discrete glue dots 50 .

[0065] In the embodiment of the present application, as shown in Figures 1 and 3, a plurality of glue dots 50 are arranged at intervals on the first surface 11 of the first battery cell 10 along the first direction K, and each glue dot 50 is at least partially arranged between two adjacent fine grids 20, so that a first connecting wire 30 is fixed to the first surface 11 of the first battery cell 10 through the plurality of glue dots 50.

[0066] It should be noted that the plurality of first connecting wires 30 in the embodiment of the present application can be fixed on the first surface of the first battery cell 10 in the above manner, thereby forming a plurality of discrete glue dots 50 on the first surface 11 of the first battery cell 10 .

[0067] As an optional embodiment, as shown in FIG. 1 and FIG. 3 , the length of the first terminal line 40 is less than 1 / 4 of the projected length of the first connecting line 30 on the first battery cell 10 .

[0068] Typically, the first terminal wire 40 is screen-printed with metal paste on the first surface 11 of the first cell 10, near the first edge 13. Therefore, in the embodiment of the present application, as shown in Figures 1 and 3 , the length of the first terminal wire 40 is set to be less than 1 / 4 of the projected length of the first connecting wire 30 on the first cell 10. This reduces the amount of metal paste used and lowers the production cost of the battery string.

[0069] For example, the length of the first terminal line 40 can be set to 1 / 5 of the length of the first connecting line 30 projected on the first battery cell 10, or the length of the first terminal line 40 can be set to 1 / 6 of the length of the first connecting line 30 projected on the first battery cell 10, and so on. This application does not impose any specific restrictions on this, and in actual use, technicians can set it as needed.

[0070] As an optional implementation, as shown in FIG. 1 to FIG. 4 , only one glue dot 50 is provided on the overlapping portion, and the glue dot 50 is a first glue dot 51 .

[0071] In the embodiment of the present application, as shown in Figures 1 to 4 , only one glue point 50 is provided at the overlapping portion of the first connecting wire 30 and the first terminal wire 40. This glue point 50 is referred to as a first glue point 51. The first glue point 51 adheres one end of the first connecting wire 30 to a side of the first surface 11 of the first battery cell 10 near the first edge 13, partially overlapping the first terminal wire 40. The first glue point 51 secures one end of the first connecting wire 30 and simultaneously electrically connects the first connecting wire 30 and the first terminal wire 40.

[0072] As an optional embodiment, as shown in Figures 3 and 4, the distance between the first glue dot 51 and the end of the first end line 40 close to the first edge 13 is a first distance, and the distance between the first glue dot 51 and the end of the first end line 40 away from the first edge 13 is a second distance, wherein the ratio of the first distance to the second distance is 1:5 to 2:1.

[0073] As shown in Figures 3 and 4, in the embodiment of the present application, the distance between the first glue dot 51 and the end of the first end line 40 close to the first edge 13 is set to a first distance, and the distance between the first glue dot 51 and the end of the first end line 40 away from the first edge 13 is set to a second distance. The ratio of the first distance to the second distance is set to between 1:5 and 2:1. For example, the ratio of the first distance to the second distance can be 1:4, 1:3, 1:2, 1:1, 3:2, 8:5, 2:1, etc.

[0074] It should be noted that, along a direction perpendicular to the plane of the first cell 10, the first glue dot 51 can be circular, square, rectangular, etc. For example, when the first glue dot 51 is circular, the diameter of the first glue dot 51 can be 1.1 mm. The first distance refers to the distance between the center of the first glue dot 51 and the end of the first end line 40 closer to the first edge 13, while the second distance refers to the distance between the center of the first glue dot 51 and the end of the first end line 40 farther from the first edge 13.

[0075] When the first glue dot 51 is rectangular, the size of the first glue dot 51 can be 1 mm by 1.2 mm. The first distance refers to the distance between the center of the first glue dot 51 and the end of the first end line 40 closer to the first edge 13. The second distance refers to the distance between the center of the first glue dot 51 and the end of the first end line 40 farther from the first edge 13.

[0076] As an optional embodiment, as shown in FIG. 1 and FIG. 3 , the first surface 11 of the first battery cell 10 further includes a second terminal line 41 close to the second edge 14 , and the second terminal line 41 is completely covered by the first connection line 30 .

[0077] As shown in FIG1 and FIG3 , in the embodiment of the present application, a second termination line 41 is provided on a side of the first surface 11 of the first cell 10 near the second edge 14. The second termination line 41 extends along a first direction K and extends to the fine grid 20 closest to the second edge 14. Thus, the second termination line 41 can collect current collected by the fine grid 20 in the area near the second edge 14 of the first surface 11 of the first cell 10.

[0078] The second terminal line 41 is completely covered by the first connecting line 30 . That is, the second terminal line 41 is connected to the first connecting line 30 , so that the current collected by the second terminal line 41 can be conducted to the first connecting line 30 .

[0079] It should be noted that the second terminal line 41 in the embodiment of the present application is conductive and can be formed by screen printing a metal paste on the first surface 11 of the first cell 10, near the second edge 14, to form the second terminal line 41 on the first surface 11 of the first cell 10. As an optional embodiment, as shown in FIG1 , at least one glue dot 50 is provided on the second terminal line 41.

[0080] As shown in FIG. 1 , in the embodiment of the present application, at least one glue point 50 is provided on the second terminal line 41 , so that the first connecting line 30 is fixed to the second terminal line 41 through the at least one glue point 50 , so that the first connecting line 30 covers the second terminal line 41 .

[0081] As an optional embodiment, as shown in Figure 2, the two ends of the first terminal line 40 are respectively connected to two fine grids 20, and a first thickened section 60 is provided at the connection with the two fine grids 20. The first terminal line 40 is electrically connected to the fine grid 20 through the first thickened section 60.

[0082] As shown in FIG2 , in the embodiment of the present application, the two ends of the first terminal line 40 are respectively connected to two fine gates 20, and a first thickened section 60 is provided at the connection between the two ends of the first terminal line 40 and the fine gates 20. This allows both ends of the first terminal line 40 to be electrically connected to the fine gates 20 via a first thickened section 60, thereby improving the reliability of the connection between the two ends of the first terminal line 40 and the fine gates 20.

[0083] It should be noted that the first thickened section 60 in the embodiment of the present application is conductive, and metal paste can be printed at the connection between the end of the first terminal line 40 and the fine grid 20 by screen printing to form the first thickened section 60 at the connection between the end of the first terminal line 40 and the fine grid 20.

[0084] As shown in FIG5 , the first thickened section 60 can be a structure that is thick in the middle and narrow at both ends. Of course, the first thickened section 60 can also have other structures. In the embodiment of the present application, there are no excessive restrictions on the specific structure of the first thickened section 60. In actual use, technicians can configure it as needed.

[0085] As an optional embodiment, as shown in Figure 7, the first battery cell 10 also includes a second surface 12 arranged opposite to the first surface 11, and the battery string also includes a second connecting line connected to the second surface 12; the first connecting line 30 and the second connecting line are respectively connected to the first surface 11 and the second surface 12 of the first battery cell 10 through a plurality of glue points 50; wherein, the projections of the plurality of glue points 50 on the first surface 11 on the first battery cell 10 and the projections of the plurality of glue points 50 on the second surface 12 on the first battery cell 10 are staggered.

[0086] In the embodiment of the present application, as shown in FIG. 7 , a plurality of second connection lines are connected to the second surface 12 of the first battery cell 10 . The plurality of second connection lines extend along the first direction K and are adhered to the second surface 12 of the first battery cell 10 through a plurality of glue points 50 .

[0087] As shown in FIG. 3 , a plurality of first connection lines 30 are connected to the first surface 11 of the first battery cell 10 . The plurality of first connection lines 30 extend along a first direction K and are adhered to the first surface 11 of the first battery cell 10 via a plurality of adhesive dots 50 .

[0088] During the processing of the battery string, multiple glue dots 50 can be printed on the first surface 11 of the first battery cell 10 first, and then multiple glue dots 50 can be printed on the second surface 12 of the first battery cell 10. During the printing process, since the first surface 11 of the first battery cell 10 is unsupported, in order to avoid the multiple glue dots 50 on the first surface 11, the projections of the multiple glue dots 50 on the second surface 12 on the first battery cell 10 are offset from the projections of the multiple glue dots 50 on the first surface 11 on the first battery cell 10.

[0089] As an optional embodiment, as shown in FIG4 , along the first direction K, the distance between the end of the first connecting line 30 and the first edge 13 of the first battery cell 10 is greater than or equal to 3 mm and less than or equal to 8.75 mm.

[0090] In the embodiment of the present application, as shown in FIG4 , the distance between the end of the first connecting wire 30 and the first edge 13 of the first battery cell 10 along the first direction K is set to be greater than or equal to 3 mm and less than or equal to 8.75 mm. Specifically, the distance between the end of the first connecting wire 30 and the first edge 13 of the first battery cell 10 can be set to 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 8.75 mm, etc.

[0091] In the embodiment of the present application, the distance between the end of the first connecting wire 30 and the first edge 13 of the first battery cell 10 is set to be greater than or equal to 3 mm and less than or equal to 8.75 mm. This is to prevent the first connecting wire 30 from being too close to the first edge 13 of the first battery cell 10, causing the first connecting wire 30 to be electrically connected to other connecting wires, thereby causing a short circuit in the battery string.

[0092] As an optional embodiment, as shown in Figure 4, along the first direction K, the distance between the first glue point 51 and the first edge 13 is a third distance, and the distance between the end of the first connecting line 30 and the first edge 13 is a fourth distance; wherein, the difference between the third distance and the fourth distance is greater than or equal to 2 mm.

[0093] In the embodiment of the present application, as shown in FIG4 , along the first direction K, the distance between the first glue point 51 and the first edge 13 is set to a third distance, and the distance between the end of the first connecting line 30 close to the first edge 13 and the first edge 13 is set to a fourth distance. The difference between the third distance and the fourth distance is greater than or equal to 2 mm.

[0094] For example, the difference between the third distance and the fourth distance may be 2 mm, 2.2 mm, 2.5 mm, 2.7 mm, 3 mm, 3.3 mm, and so on.

[0095] In the embodiment of the present application, the difference between the third distance between the first glue point 51 and the first edge 13 and the fourth distance between the end of the first connecting wire 30 near the first edge 13 and the first edge 13 is set to be greater than or equal to 2 mm. This prevents the end of the first connecting wire 30 from being too close to the first edge 13, thereby causing a short circuit in the battery string.

[0096] As an optional embodiment, as shown in FIG. 1 to FIG. 4 , along the first direction K, the distance between the fine grid 20 and the first edge 13 is 0.75 mm.

[0097] In the embodiment of the present application, as shown in Figures 1 to 4 , the distance between the fine grid 20 near the first edge 13 and the first edge 13 is set to 0.75 mm along the first direction K. This facilitates the placement of the first terminal line 40 and the first thickened section 60 between the end of the first terminal line 40 near the first edge 13 and the fine grid 20.

[0098] As an optional embodiment, along the second direction H, the length of the first battery cell 10 and the second battery cell is greater than or equal to 180 mm and less than or equal to 240 mm.

[0099] In the embodiment of the present application, the length of the first cell 10 and the second cell along the second direction H is greater than or equal to 180 mm and less than or equal to 240 mm. For example, along the second direction H, the length of the first cell 10 and the second cell can be 180 mm, 182 mm, 191.6 mm, 191.75 mm, 192 mm, 210 mm, 220 mm, 230 mm, 240 mm, etc.

[0100] Optionally, the first battery cell 10 and the second battery cell may be a rectangular structure, and the specific dimensions of the first battery cell 10 and the second battery cell of the rectangular structure may include: (182±2)mm*(96±1)mm, (192±2)mm*(91±1)mm, (182±2)mm*(91±1)mm, (182±2)mm*(105±1)mm, etc.

[0101] Of course, in the embodiments of the present application, there is no limitation on the specific structure and size of the first battery cell 10 and the second battery cell. First battery cells 10 and second battery cells of any structure and any size fall within the scope of protection of the present application. In actual use, technicians can select appropriate battery cells as the first battery cell 10 and the second battery cell as needed.

[0102] The present application provides a battery string comprising: a first connecting wire and a first and second battery cell electrically connected by the first connecting wire, wherein the first connecting wire extends along a first direction on the first surface of the first battery cell, the first battery cell having opposing first and second edges along the first direction; a first termination wire extending along the first direction is provided on the first surface of the first battery cell, the first termination wire being close to the first edge and away from the second edge; a portion of the first connecting wire extending onto the first termination wire forms an overlapping portion, the length of the overlapping portion being 40% to 80% of the length of the first termination wire. In an embodiment of the present application, the battery string comprises a first termination wire extending along the first direction on the first surface of the first battery cell, the first termination wire being close to the first edge of the first battery cell and away from the second edge; a first connecting wire extending along the first direction on the first surface of the first battery cell, a portion of the first connecting wire extending onto the first termination wire forms an overlapping portion, the length of the overlapping portion being 40% to 80% of the length of the first termination wire. Thus, the first termination wire can collect current generated in the first battery cell near the first edge region, thereby improving the photovoltaic conversion efficiency of the battery cell.

[0103] 7 , a first cross-sectional view of the photovoltaic assembly according to an embodiment of the present application is shown; and FIG. 8 , a second cross-sectional view of the photovoltaic assembly according to an embodiment of the present application is shown.

[0104] As shown in Figures 7 and 8, an embodiment of the present application also provides a photovoltaic module, including a cover plate 70, a first adhesive layer 71, multiple battery strings as described in the above embodiments, a second adhesive layer, and a backplane arranged in sequence, wherein the multiple battery strings are arranged at intervals.

[0105] As shown in FIG. 7 and FIG. 8 , an embodiment of the present application further provides a photovoltaic assembly, which includes a plurality of battery strings described in the above embodiments, and the plurality of battery strings are arranged at intervals.

[0106] The cover plate 70 is connected to one side of the battery string through a first adhesive layer 71 , and the back plate is connected to the other side of the battery string through a second adhesive layer.

[0107] It should be noted that in the embodiment of the present application, the battery string included in the photovoltaic module has the same structure as the battery string described in the above embodiment, and its beneficial effects are also similar, which will not be repeated here.

[0108] As an optional implementation, as shown in FIG. 7 and FIG. 8 , the first adhesive layer 71 and / or the second adhesive layer is a multi-layer composite adhesive layer.

[0109] As shown in FIG. 7 and FIG. 8 , the first adhesive layer 71 and / or the second adhesive layer in the embodiment of the present application are / is a multi-layer composite adhesive layer, which may include an EVA layer and a POE layer.

[0110] The EVA layer is an ethylene-vinyl acetate copolymer layer, which has water resistance, corrosion resistance, and is easy to process by hot pressing, cutting, gluing, laminating, etc. The POE layer is a polymer layer of ethylene and octene, or a polymer layer of ethylene and butene.

[0111] As an optional implementation, as shown in FIG7 , the multi-layer composite adhesive layer is a double-layer structure, including an EVA layer 711 and a POE layer 712 stacked in sequence.

[0112] As shown in Figure 7, the multi-layer composite adhesive layer has a double-layer structure, including an EVA layer 711 and a POE layer 712 stacked in sequence. EVA layer 711 is connected to the battery string. EVA layer 711 is easily hot-pressed, facilitating the hot-pressing of the photovoltaic module.

[0113] As an optional implementation, as shown in FIG8 , the multi-layer composite adhesive layer is a three-layer structure, including an EVA layer 711 , a POE layer 712 and an EVA layer 711 stacked in sequence.

[0114] As shown in Figure 8, the multi-layer composite adhesive layer has a three-layer structure, including an EVA layer 711, a POE layer 712, and an EVA layer 711 stacked in sequence. One EVA layer 711 is connected to the battery string, and the other EVA layer 711 is connected to the cover plate 70 or the back plate. In order to facilitate the use of hot pressing, the cover plate 70 is connected to one side of the battery string through the multi-layer composite adhesive layer, and the back plate is connected to the other side of the battery string through the multi-layer composite adhesive layer.

[0115] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0116] References herein to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Furthermore, please note that examples of the phrase "in one embodiment" herein do not necessarily all refer to the same embodiment. In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0117] In the claims, any reference signs placed between brackets shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery string, wherein: include: a first connecting line and a first battery cell and a second battery cell electrically connected via the first connecting line; The first connecting line extends along a first direction on a first surface of the first battery sheet, and the first battery sheet has a first edge and a second edge opposite to each other along the first direction; A first terminal line extending along the first direction is disposed on the first surface of the first battery sheet, and the first terminal line is close to the first edge and away from the second edge; A portion of the first connecting line extends to the first terminal line to form an overlapping portion, and a ratio of a length of the overlapping portion to a length of the first terminal line is less than or equal to 80%.

2. The battery string according to claim 1, wherein: The length of the overlapping portion accounts for 40% to 80% of the length of the first terminal line.

3. The battery string according to claim 1, wherein: There are multiple first connection wires and multiple first terminal wires, and the first connection wires and the first terminal wires are arranged in a one-to-one correspondence.

4. The battery string according to claim 1, wherein: The first surface of the first battery cell is further provided with a plurality of fine grids extending along a second direction and spaced apart along the first direction, wherein the second direction intersects the first direction; The first terminal line is connected to only a portion of the plurality of fine grids close to the first edge, and the first terminal line is connected to the fine grid closest to the first edge.

5. The battery string according to claim 4, wherein: A bonding layer is provided on the first connection line, and the first connection line is connected to at least a part of the fine grid through the bonding layer.

6. The battery string according to claim 1, wherein: The first connecting wire is fixed to the first surface of the first battery cell through a plurality of discrete glue dots.

7. The battery string according to claim 1, wherein: The length of the first terminal line is less than 1 / 4 of the projected length of the first connecting line on the first battery cell.

8. The battery string according to claim 1, wherein: The first surface of the first battery cell also includes a second terminal line close to the second edge, and the second terminal line is completely covered by the first connecting line.

9. The battery string according to claim 1, wherein: Along the first direction, a distance between an end of the first connecting line and a first edge of the first battery cell is greater than or equal to 3 mm and less than or equal to 8.75 mm.

10. The battery string according to claim 6, wherein: Only one glue point is provided on the overlapping portion, and the glue point is a first glue point; Along the first direction, the distance between the first glue point and the first edge is a third distance, and the distance between the end of the first connecting line and the first edge is a fourth distance; A difference between the third distance and the fourth distance is greater than or equal to 2 mm.

11. The battery string according to claim 1, wherein: Along the second direction, the length of the first battery cell and the second battery cell is greater than or equal to 180 mm and less than or equal to 240 mm.

12. The battery string according to claim 1, wherein: The sizes of the first battery cell and the second battery cell include: (182±2)mm*(96±1)mm, (192±2)mm*(91±1)mm, (182±2)mm*(91±1)mm, (182±2)mm*(105±1)mm.

13. A battery string, wherein: include: a first connecting line and a first battery cell and a second battery cell electrically connected via the first connecting line; The first connecting line is fixed on the first surface of the first battery sheet through a plurality of discrete glue points, the first connecting line extends along a first direction, and the first battery sheet has a first edge and a second edge opposite to each other in the first direction; A first terminal line extending along the first direction is disposed on the first surface of the first battery sheet, and the first terminal line is close to the first edge and away from the second edge; A portion of the first connecting line extends to the end line to form an overlapping portion, and only one glue dot is arranged on the overlapping portion, and the glue dot is a first glue dot. The distance between the first glue dot and the end of the first end line close to the first edge is a first distance, and the distance between the first glue dot and the end of the first end line away from the first edge is a second distance. The ratio of the first distance to the second distance is 1:5 to 2:

1.

14. The battery string according to claim 13, wherein: The first surface of the first battery cell also includes a second terminal line close to the second edge, and the second terminal line is completely covered by the first connecting line.

15. The battery string according to claim 14, wherein: At least one glue point is arranged on the second end line.

16. The battery string according to any one of claims 13 to 15, wherein: Two ends of the first terminal line are respectively connected to two fine grids, and a first thickened section is provided at the connection with the two fine grids. The first terminal line is electrically connected to the fine grids through the first thickened section.

17. The battery string according to claim 13, wherein: The first battery cell further includes a second surface disposed opposite to the first surface, and the battery string further includes a second connecting line connected to the second surface; The second connecting line is connected to the second surface of the first battery cell through a plurality of discrete glue points; The projections of the multiple glue dots on the first surface on the first battery cell and the projections of the multiple glue dots on the second surface on the first battery cell are staggered.

18. The battery string according to claim 13, wherein: Along the first direction, the distance between the first glue point and the first edge is a third distance, and the distance between the end of the first connecting line and the first edge is a fourth distance; A difference between the third distance and the fourth distance is greater than or equal to 2 mm.

19. A photovoltaic module, wherein: It comprises a cover plate, a first adhesive layer, a plurality of battery strings according to any one of claims 1 to 18, a second adhesive layer, and a back plate which are arranged in sequence, wherein the plurality of battery strings are arranged at intervals.

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