Battery strings and solar modules

Abstract

This application belongs to the technical field of solar modules and specifically discloses a battery string and a solar module. The battery string includes a first connecting wire and a first battery cell and a second battery cell electrically connected by the first connecting wire, wherein the first connecting wire extends in a first direction to a first surface of the first battery cell, the first battery cell has a first edge and a second edge facing each other in the first direction, the first surface of the first battery cell is provided with a first tip line extending in the first direction, the first tip line is close to the first edge and far from the second edge, a portion of the first connecting wire extends onto the first tip line to form an overlapping portion, the ratio of the length of the overlapping portion to the length of the first tip line is 80% or less.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on August 22, 2023, with an application number of 202311061413.6 and an invention title of "Battery String and Solar Module", and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of solar modules, and specifically, to battery strings and solar modules.

Background Art

[0003] A battery string, which is a core component of a solar module, can convert solar energy into electrical energy. Usually, a battery string includes a plurality of battery cells arranged one by one, and a bus bar and fingers are provided on the surface of the battery cell. The current generated in the battery cell is collected by the fingers, and then the current generated in the battery cell is collected. The bus bar and the fingers are cross-connected, and the current collected by the fingers is aggregated by the bus bar, so that the current generated in the battery cell is aggregated.

[0004] During the processing of the battery string, usually, paste is printed on the surface of the battery cell by a screen printing method to form a plurality of fingers and a plurality of bus bars perpendicular to each other on the surface of the battery cell. It is expected that the current generated in the battery cell can be collected and aggregated by the plurality of fingers and the plurality of bus bars, so that the current generated in the entire battery cell can be collected. However, to provide a plurality of bus bars and a plurality of fingers on the surface of the battery cell, a large amount of paste is required, which increases the cost of the battery cell. And the fingers and the bus bars shield the upper surface of the battery cell, affecting the light absorption efficiency of the upper surface of the battery cell and thus affecting the photoelectric conversion efficiency of the battery cell.

[0005] In related technologies, to reduce the manufacturing cost of battery cells and improve the photoelectric conversion efficiency of battery cells, only fingers are provided on the surface of the battery cell, ribbons are provided at the busbar positions, and the current collected by the fingers is aggregated by connecting the ribbons to the fingers.

[0006] However, in the direction in which the ribbon extends, it may not be possible for the ribbon to cover the entire surface of the battery cell. As a result, the fingers on both sides of the battery cell's surface may not be able to connect to the ribbon in that direction, preventing current collected by some of the fingers from being transferred to the ribbon, which can affect the photoelectric conversion efficiency of the battery cell. [Overview of the Initiative]

[0007] This application aims to provide a battery string and a solar module.

[0008] Specifically, this application relates to the following aspects: In a first aspect, the 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 in a first direction to a first surface of the first battery cell, the first battery cell has a first edge and a second edge facing each other in the first direction, the first surface of the first battery cell is provided with a first tip line extending in the first direction, the first tip line being close to the first edge and away from the second edge, a portion of the first connecting line extending onto the first tip line to form an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first tip line being 80% or less.

[0009] Selectively, the length of the overlapping portion accounts for 40% to 80% of the length of the first tip line.

[0010] Selectively, there may be multiple first connecting lines and first end lines, and the first connecting lines and first end lines are provided in a one-to-one correspondence.

[0011] Selectively, the first surface of the first battery cell is further provided with a plurality of fingers extending in a second direction and spaced apart in the first direction, the second direction intersects the first direction, the first tip line is connected only to the portion of the plurality of fingers closest to the first edge, and the first tip line is connected to the finger closest to the first edge.

[0012] Selectively, the first connecting wire has a bonding layer, and the first connecting wire is connected to at least a portion of the finger by the bonding layer.

[0013] Selectively, the first connecting wire is fixed to the first surface of the first battery cell by a plurality of spaced-apart adhesive points.

[0014] Selectively, the length of the first tip wire is less than 1 / 4 of the projected length of the first connecting wire in the first battery cell.

[0015] Selectively, the first surface of the first battery cell further includes a second tip line near the second edge, the second tip line as a whole being covered by the first connecting line.

[0016] Selectively, in the first direction, the distance between the end of the first connecting wire and the first edge of the first battery cell is 3 mm or more and 8.75 mm or less.

[0017] Selectively, only one adhesive point is provided in the overlapping portion, the adhesive point is the first adhesive point, the distance between the first adhesive point and the first edge in the first direction is the third distance, the distance between the end of the first connecting line and the first edge is the fourth distance, and the difference between the third distance and the fourth distance is 2 mm or more.

[0018] Selectively, in the second direction, the lengths of the first battery cell and the second battery cell are 180 mm or more and 240 mm or less.

[0019] Selectively, the dimensions of the first and second battery cells include (182±2)mm × (96±1)mm, (192±2)mm × (91±1)mm, (182±2)mm × (91±1)mm, and (182±2)mm × (105±1)mm.

[0020] In a second aspect, the present application includes a first connecting wire and a first and second battery cell electrically connected by the first connecting wire, wherein the first connecting wire is fixed to a first surface of the first battery cell by a plurality of spaced-apart adhesive points, the first connecting wire extends in a first direction, the first battery cell has opposing first and second edges in the first direction, the first surface of the first battery cell is provided with a first tip line extending in the first direction, the first tip line is close to the first edge, and the A battery string is disclosed, wherein the first connecting wire is separated from the second edge, a portion of the first connecting wire extends to the tip wire to form an overlapping portion, and only one adhesive point is provided in the overlapping portion, the adhesive point being the first adhesive point, the distance between the first adhesive point and the end of the first tip wire near the first edge is defined as the first distance, the distance between the first adhesive point and the end of the first tip wire far from the first edge is defined as the second distance, and the ratio of the first distance to the second distance is 1:5 or more and 2:1 or less.

[0021] Selectively, the first surface of the first battery cell further includes a second tip line near the second edge, the second tip line as a whole being covered by the first connecting line.

[0022] Selectively, at least one of the adhesive points is provided on the second tip line.

[0023] Selectively, both ends of the first tip wire are connected to two fingers, and a first thick portion is provided at the connection point with the two fingers, and the first tip wire is electrically connected to the fingers by the first thick portion.

[0024] Selectively, the first battery cell further includes a second surface provided opposite to the first surface, the battery string further includes a second connecting line connected to the second surface, the second connecting line being connected to the second surface of the first battery cell by a plurality of spaced-apart adhesive points, the projections of the plurality of adhesive points on the first battery cell on the first surface and the projections of the plurality of adhesive points on the first battery cell on the second surface are arranged alternately.

[0025] Selectively, in the first direction, the distance between the first adhesive point and the first edge is defined as the third distance, and the distance between the end of the first connecting line and the first edge is defined as the fourth distance, with the difference between the third distance and the fourth distance being 2 mm or more.

[0026] In a third aspect, the present application discloses a solar module comprising, in order, a cover plate, a first adhesive layer, a plurality of battery strings as described in the first or second aspect, a second adhesive layer, and a back plate, wherein the plurality of battery strings are spaced apart.

[0027] This application provides a battery string and a solar module, which includes a first connection line, a first battery cell and a second battery cell electrically connected by the first connection line. The first connection line extends in a first direction on a first surface of the first battery cell. The first battery cell has a first edge and a second edge facing each other in the first direction. On the first surface of the first battery cell, a first tip line extending in the first direction is provided. The first tip line is close to the first edge and far from the second edge. A part of the first connection line extends onto the first tip line to form an overlapping part, and the ratio of the length of the overlapping part to the length of the first tip line is 80% or less. In the battery string according to the embodiment of this application, a first tip line extending in a first direction is provided on a first surface of the first battery cell. The first tip line is close to the first edge of the first battery cell and far from the second edge. The first connection line extends in the first direction on the first surface of the first battery cell. A part of the first connection line extends onto the first tip line to form an overlapping part. Since the ratio of the length of the overlapping part to the length of the first tip line is 80% or less, the current generated in the region close to the first edge in the first battery cell can be collected by the first tip line, and the photoelectric conversion efficiency of the battery cell can be improved.

[0028] Furthermore, by providing as described above, the current collected by the fingers around the first edge can be sufficiently collected, and it can be ensured that the first connection line does not protrude from the first edge of the first battery cell to cause a short-circuit phenomenon in the battery string.

[0029] The above description is only an outline of the technical solution of this application. In order to understand the technical means of this application more clearly and be able to implement it based on the content of the specification, and to make the above and other objects, features and advantages of this application more understandable, specific embodiments of this application will be given below.

Brief Description of the Drawings

[0030] To more clearly explain the technical solutions in the embodiments or related technologies of this application, the drawings used in describing the embodiments or related technologies will be briefly described below. Naturally, the drawings described below are only a part of the embodiments of this application, and those skilled in the art will be able to conceive of other drawings based on these drawings without requiring any creative effort.

[0031] [Figure 1] A schematic diagram 1 of the structure of the first surface of the first battery cell described in the embodiments of this application is shown. [Figure 2] A partially enlarged view AA of the first battery cell described in the embodiment of this application is shown. [Figure 3] A schematic diagram 2 shows the structure of the first surface of the first battery cell described in the embodiments of this application. [Figure 4] A partially enlarged view BB of the first battery cell described in the embodiment of this application is shown. [Figure 5] A schematic diagram of the structure of the first thick section described in the embodiment of this application is shown. [Figure 6] A schematic diagram of the structure of the second surface of the first battery cell described in the embodiments of this application is shown. [Figure 7] A cross-sectional view 1 of a solar module described in the embodiment of this application is shown. [Figure 8] A cross-sectional view 2 of the solar module described in the embodiment of this application is shown. [Modes for carrying out the invention]

[0032] To further clarify the purpose, technical solutions, and advantages of the embodiments of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the drawings of the embodiments. Naturally, the embodiments described are only a part of the embodiments of this application, not all of them. All other embodiments that can be obtained by a person skilled in the art without creative effort based on the embodiments of this application are all within the scope of protection of this application.

[0033] Figure 1 shows a schematic diagram 1 of the structure of the first surface of the first battery cell described in the embodiment of this application; Figure 2 shows a partially enlarged view AA of the first battery cell described in the embodiment of this application; Figure 3 shows a schematic diagram 2 of the structure of the first surface of the first battery cell described in the embodiment of this application; Figure 4 shows a partially enlarged view BB of the first battery cell described in the embodiment of this application; Figure 5 shows a schematic diagram of the structure of the first thick part described in the embodiment of this application; and Figure 6 shows a schematic diagram of the structure of the second surface of the first battery cell described in the embodiment of this application.

[0034] 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, wherein the first connecting wire 30 extends in a first direction K to the first surface 11 of the first battery cell 10, the first battery cell 10 has a first edge portion 13 and a second edge portion 14 facing each other in the first direction K, the first surface 11 of the first battery cell 10 is provided with a first tip wire 40 extending in the first direction K, the first tip wire 40 is close to the first edge portion 13 and far from the second edge portion 14, a part of the first connecting wire 30 extends onto the first tip wire 40 to form an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first tip wire 40 is 80% or less. In this way, sufficient current can be collected for the fingers at the edges, and it is possible to ensure that the ribbon does not protrude from the edges 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 tip line 40.

[0035] In the embodiment disclosed in this application, a first tip wire 40 is provided on the first surface 11 of the first battery cell 10, extending in a first direction K. The first tip wire 40 is close to the first edge 13 of the first battery cell 10 and away from the second edge 14. A first connecting wire 30 extends on the first surface 11 of the first battery cell 10 in a first direction K. A portion of the first connecting wire 30 extends onto the first tip wire 40, forming an overlapping portion. The ratio of the length of the overlapping portion to the length of the first tip wire 40 is 80% or less. This allows the current generated in the region of the first battery cell 10 close to the first edge 13 to be collected by the first tip wire 40, thereby improving the photoelectric conversion efficiency of the battery cell. Furthermore, by providing the arrangement as described above, the current collected by the fingers 20 around the first edge 13 can be sufficiently collected, and it is possible to ensure that the first connecting wire 30 does not protrude from the first edge 13 of the first battery cell 10 and cause a short circuit in the battery string.

[0036] Selectively, the length of the overlapping portion accounts for 40% to 80% of the length of the first tip line 40.

[0037] Embodiments of this application provide a battery string comprising a first battery cell 10 and a second battery cell spaced apart, with a first gap between the first battery cell 10 and the second battery cell. Both the first battery cell 10 and the second battery cell include a first surface and a second surface facing each other, and the first surface 11 of the first battery cell 10 and the first surface of the second battery cell are oriented in the same direction.

[0038] Here, the first battery cell 10 has a first edge portion 13 and a second edge portion 14 that are opposite to each other in the first direction K, and the first surface 11 of the first battery cell 10 is provided with a first tip line 40 that extends in the first direction K, and the first tip line 40 is close to the first edge portion 13 and far from the second edge portion 14.

[0039] As shown in Figure 3, the first connecting wire 30 extends in a first direction K to the first surface 11 of the first battery cell 10, with a portion of the first connecting wire 30 extending onto the first tip line 40 and forming an overlapping portion with the first tip line 40, the length of which accounts for 40% to 80% of the length of the first tip line 40. The other end of the first connecting wire 30 extends to the second edge 14 of the first battery cell 10, passes through the first gap, and connects to the second surface of the second battery cell. Thus, the first battery cell 10 and the second battery cell are electrically connected by the first connecting wire 30.

[0040] For example, the length of the overlap between the first connecting wire 30 and the first end wire 40 may be 40%, 50%, 60%, 70%, 80%, etc., of the length of the first end wire 40. This is not specifically limited in this application, and the technician may set it as needed during actual use.

[0041] It should be noted that both the first connecting wire 30 and the first tip wire 40 in the embodiments of this application have conductive properties. Here, the first connecting wire 30 may be a ribbon, a welding rod, or the like. Furthermore, the first tip wire 40 can be formed on the first surface 11 of the first battery cell 10 by screen printing, by printing a metal paste on the side of the first surface 11 of the first battery cell 10 that is close to the first edge 13.

[0042] Naturally, the above is merely one example of the first connecting wire 30 and one method for forming the first tip wire 40, and does not limit this application. In actual use, an expert may select an appropriate first connecting wire 30 as needed, and an appropriate method for providing the first tip wire 40 on the first surface 11 of the first battery cell 10 as needed.

[0043] The battery string provided in the embodiment of this application has a first tip line 40 extending in a first direction K from the first surface 11 of the first battery cell 10, the first tip line 40 being close to the first edge 13 of the first battery cell 10 and away from the second edge 14, and a first connecting line 30 extending in a first direction K from the first surface 11 of the first battery cell 10, a portion of which extends onto the first tip line 40 to form an overlapping portion, the length of which is 40% to 80% of the length of the first tip line 40, thereby allowing the current generated in the region of the first battery cell 10 close to the first edge 13 to be collected by the first tip line 40, thereby improving the photoelectric conversion efficiency of the battery cell.

[0044] As one optional embodiment, as shown in Figures 1 and 3, there are multiple first connecting wires 30 and first end wires 40, and the first connecting wires 30 and first end wires 40 are provided in a one-to-one correspondence.

[0045] In the embodiments of this application, as shown in Figures 1 and 3, multiple first connecting wires 30 and first tip wires 40 are provided, and each of the first connecting wires 30 corresponds to one first tip wire 40. As a result, current generated in the region near the first edge 13 of the first battery cell 10 is collected by the multiple first tip wires 40, and the collected current is conducted to the corresponding first connecting wire 30.

[0046] As one selective 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 fingers 20 extending in a second direction H and spaced apart in a first direction K, the second direction H intersects with the first direction K, the first tip line 40 is connected only to the portion of the plurality of fingers 20 closest to the first edge 13, and the first tip line 40 is connected to the finger 20 closest to the first edge 13.

[0047] In the embodiments of this application, as shown in Figures 1 to 4, the first surface 11 of the first battery cell 10 is further provided with a plurality of fingers 20 that extend in the second direction H and are spaced apart in the first direction K. The current generated on the first surface 11 of the first battery cell 10 can be collected by the plurality of fingers 20.

[0048] The second direction H intersects with the first direction K. Specifically, the second direction H may be perpendicular to the first direction K. In other words, each of the first connecting lines 30 is connected by intersecting with multiple fingers 20, thereby allowing the current generated in the multiple fingers 20 to be collected by the first connecting line 30, and the current generated on the first surface 11 of the first battery cell 10 to be collected.

[0049] To avoid short circuits in the battery string caused by the first connecting wire 30 being electrically connected to other connecting wires, 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 is not extended to the first edge 13 of the first surface 11 of the first battery cell 10. Therefore, multiple first tip wires 40 are provided on the side of the first surface 11 of the first battery cell 10 that is close to the first edge 13, and the first tip wires 40 are connected to the fingers 20 in the part close to the first edge 13, and the first tip wires 40 are connected to the fingers 20 closest to the first edge 13, thereby collecting the current generated in the fingers 20 in the part close to the first edge 13. Then, by conducting the collected current to the corresponding first connecting wire 30, the photoelectric conversion efficiency of the battery cell is improved.

[0050] In one selective embodiment, as shown in Figure 7, a bonding layer 31 is provided on the first connecting wire 30, and the first connecting wire 30 is connected to at least a portion of the finger 20 by the bonding layer 31.

[0051] In the embodiment of this application, as shown in Figure 7, there is a bonding layer 31 on the first connecting line 30. Here, the bonding layer 31 is conductive, and the first connecting line 30 is connected to at least a portion of the finger 20 by the bonding layer 31, so that this portion of the finger 20 and the first connecting line 30 are electrically connected, and the current collected by this portion of the finger 20 is collected by the first connecting line 30.

[0052] For example, if the first connecting wire 30 is a ribbon, the bonding layer 31 may be a finger 20. The ribbon is connected by a tin layer to at least a portion of the tin layer.

[0053] Naturally, in the embodiments of this application, the first connecting wire 30 and the bonding layer 31 are not specifically limited, and in actual use, the technician may select the appropriate first connecting wire 30 and bonding layer 31 as needed.

[0054] In one optional embodiment, as shown in Figures 1 and 3, the first connecting wire 30 is fixed to the first surface 11 of the first battery cell 10 by a plurality of spaced-apart adhesive points 50.

[0055] In the embodiments of this application, as shown in Figures 1 and 3, in the first direction K, a plurality of adhesive points 50 are provided at intervals on the first surface 11 of the first battery cell 10, and at least a portion of each adhesive point 50 is provided between two adjacent fingers 20, thereby fixing a single first connecting wire 30 to the first surface 11 of the first battery cell 10 by the plurality of adhesive points 50.

[0056] It should be explained that in the embodiment of this application, the multiple first connecting wires 30 are all fixed to the first surface of the first battery cell 10 as described above, and multiple spaced adhesive points 50 can be formed on the first surface 11 of the first battery cell 10.

[0057] As one optional embodiment, as shown in Figures 1 and 3, the length of the first tip wire 40 is less than 1 / 4 of the projected length of the first connecting wire 30 in the first battery cell 10.

[0058] Typically, the first tip wire 40 is formed by screen printing, where metal paste is printed on the side of the first surface 11 of the first battery cell 10 that is close to the first edge 13. Therefore, in the embodiments of this application, as shown in Figures 1 and 3, the length of the first tip wire 40 is set to less than 1 / 4 of the projected length of the first connecting wire 30 on the first battery cell 10. This reduces the amount of metal paste used and lowers the manufacturing cost of the battery string.

[0059] For example, the length of the first tip wire 40 may be 1 / 5 of the projected length of the first connecting wire 30 in the first battery cell 10, or 1 / 6 of the projected length of the first connecting wire 30 in the first battery cell 10, and so on. This is not specifically limited in this application, and the technician may set it as needed during actual use.

[0060] As one optional embodiment, as shown in Figures 1 to 4, only one adhesive point 50 is provided in the overlapping portion, and the adhesive point 50 is the first adhesive point 51.

[0061] In the embodiment of this application, as shown in Figures 1 to 4, only one adhesive point 50 is provided in the overlapping portion of the first connecting wire 30 and the first tip wire 40, and this adhesive point 50 is the first adhesive point 51. The first adhesive point 51 adheres one end of the first connecting wire 30 to the side of the first surface 11 of the first battery cell 10 that is close to the first edge 13, and overlaps with a part of the first tip wire 40. As a result, the first adhesive point 51 fixes one end of the first connecting wire 30 and electrically connects the first connecting wire 30 and the first tip wire 40.

[0062] As one selective embodiment, as shown in Figures 3 and 4, the distance between the first adhesive point 51 and the end of the first tip line 40 closest to the first edge 13 is defined as the first distance, and the distance between the first adhesive point 51 and the end of the first tip line 40 further from the first edge 13 is defined as the second distance, with the ratio of the first distance to the second distance being 1:5 or more and 2:1 or less.

[0063] As shown in Figures 3 and 4, in the embodiments of this application, the distance between the first adhesive point 51 and the end of the first tip line 40 closest to the first edge 13 is defined as the first distance, and the distance between the first adhesive point 51 and the end of the first tip line 40 further from the first edge 13 is defined as the second distance, with the ratio of the first distance to the second distance being 1:5 or more and 2:1 or less. Exemplary examples of the ratio of the first distance to the second distance may be 1:4, 1:3, 1:2, 1:1, 3:2, 8:5, 2:1, etc.

[0064] It should be explained that, in a direction perpendicular to the plane on which the first battery cell 10 is located, the first adhesive point 51 may be circular, square, rectangular, or the like. For example, if the first adhesive point 51 is circular, its diameter may be 1.1 mm. The first distance is the distance between the center of the first adhesive point 51 and the end of the first tip line 40 that is close to the first edge 13, and the second distance is the distance between the center of the first adhesive point 51 and the end of the first tip line 40 that is far from the first edge 13.

[0065] If the first adhesive point 51 is rectangular, the dimensions of the first adhesive point 51 may be 1 mm × 1.2 mm. The first distance is the distance between the center of the first adhesive point 51 and the end of the first tip line 40 that is close to the first edge 13, and the second distance is the distance between the center of the first adhesive point 51 and the end of the first tip line 40 that is far from the first edge 13.

[0066] In one selective embodiment, as shown in Figures 1 and 3, the first surface 11 of the first battery cell 10 further includes a second tip line 41 near the second edge 14, and the second tip line 41 as a whole is covered by the first connecting line 30.

[0067] As shown in Figures 1 and 3, in the embodiment of this application, a second tip wire 41 is provided on the side of the first surface 11 of the first battery cell 10 that is close to the second edge 14, and the second tip wire 41 extends in the first direction K, and the second tip wire 41 extends to the finger 20 closest to the second edge 14. As a result, the current collected at the finger 20 in the region of the first surface 11 of the first battery cell 10 that is close to the second edge 14 can be collected by the second tip wire 41.

[0068] Here, the second lead wire 41 is covered as a whole by the first connecting wire 30. In other words, the second lead wire 41 is connected to the first connecting wire 30, and the current collected by the second lead wire 41 can be conducted to the first connecting wire 30.

[0069] It should be explained that the second tip line 41 in the embodiment of this application is conductive, and the second tip line 41 can be formed on the first surface 11 of the first battery cell 10 by screen printing, by printing a metal paste on the side of the first surface 11 of the first battery cell 10 that is close to the second edge 14. In one optional embodiment, as shown in Figure 1, at least one adhesive point 50 is provided on the second tip line 41.

[0070] As shown in Figure 1, in the embodiment of this application, the first connecting wire 30 is fixed to the second connecting wire 41 by at least one adhesive point 50 on the second leading wire 41, and the second leading wire 41 is covered by the first connecting wire 30.

[0071] In one optional embodiment, as shown in Figure 2, both ends of the first tip wire 40 are connected to two fingers 20, and a first thick portion 60 is provided at each connection point with the two fingers 20, and the first tip wire 40 is electrically connected to the fingers 20 by the first thick portion 60.

[0072] As shown in Figure 2, in the embodiment of this application, both ends of the first tip wire 40 are connected to two fingers 20, and a first thick portion 60 is provided at the connection point between both ends of the first tip wire 40 and the fingers 20, so that both ends of the first tip wire 40 are electrically connected to the fingers 20 by a single first thick portion 60. This improves the reliability of the connection between both ends of the first tip wire 40 and the fingers 20.

[0073] It should be explained that the first thick portion 60 in the embodiment of this application is conductive, and the first thick portion 60 can be formed at the connection between the end of the first tip wire 40 and the finger 20 by screen printing using a metal paste.

[0074] As shown in Figure 5, the first thick section 60 may have a structure that is thick in the middle and thin at both ends. Naturally, the first thick section 60 may have other structures. In the embodiments of this application, the specific structure of the first thick section 60 is not excessively limited and can be set as needed by the technician during actual use.

[0075] In one selective embodiment, as shown in Figure 6, the first battery cell 10 further includes a second surface 12 provided opposite to the first surface 11, the battery string further includes a second connecting line connected to the second surface 12, the first connecting line 30 and the second connecting line are connected to the first surface 11 and the second surface 12 of the first battery cell 10 by a plurality of adhesive points 50, respectively, with the projections of the plurality of adhesive points 50 on the first battery cell 10 on the first surface 11 and the projections of the plurality of adhesive points 50 on the first battery cell 10 on the second surface 12 being arranged alternately.

[0076] In the embodiment of this application, as shown in Figure 6, a plurality of second connecting wires are connected to the second surface 12 of the first battery cell 10, the plurality of second connecting wires extend in a first direction K, and are bonded to the second surface 12 of the first battery cell 10 by a plurality of adhesive points 50.

[0077] As shown in Figure 3, multiple first connecting wires 30 are connected to the first surface 11 of the first battery cell 10, and the multiple first connecting wires 30 extend in a first direction K and are bonded to the first surface 11 of the first battery cell 10 by multiple adhesive points 50.

[0078] During the processing of the battery string, multiple adhesive dots 50 may be printed on the first surface 11 of the first battery cell 10, and then multiple adhesive dots 50 may be printed on the second surface 12 of the first battery cell 10. Since the first surface 11 of the first battery cell 10 is not supported during printing, in order to avoid the multiple adhesive dots 50 on the first surface 11, the projections of the multiple adhesive dots 50 on the first battery cell 10 on the second surface 12 are arranged alternately with the projections of the multiple adhesive dots 50 on the first battery cell 10 on the first surface 11.

[0079] As one optional embodiment, as shown in Figure 4, the distance between the end of the first connecting wire 30 and the first edge 13 of the first battery cell 10 in the first direction K is 3 mm or more and 8.75 mm or less.

[0080] In the embodiment of this application, as shown in Figure 4, the distance between the end of the first connecting wire 30 and the first edge 13 of the first battery cell 10 in the first direction K is set to 3 mm or more and 8.75 mm or less. Specifically, the distance between the end of the first connecting wire 30 and the first edge 13 of the first battery cell 10 may be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 8.75 mm, etc.

[0081] In the embodiments of this application, by setting the distance between the end of the first connecting wire 30 and the first edge 13 of the first battery cell 10 to 3 mm or more and 8.75 mm or less, it is avoided that the first connecting wire 30 may be 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 and resulting in a short circuit in the battery string.

[0082] As one selective embodiment, as shown in Figure 4, in the first direction K, the distance between the first adhesive point 51 and the first edge 13 is defined as the third distance, and the distance between the end of the first connecting line 30 and the first edge 13 is defined as the fourth distance, with the difference between the third distance and the fourth distance being 2 mm or more.

[0083] In the embodiment of this application, as shown in Figure 4, in the first direction K, the distance between the first adhesive point 51 and the first edge 13 is defined as the third distance, and the distance between the end of the first connecting line 30 closest to the first edge 13 and the first edge 13 is defined as the fourth distance. Here, the difference between the third distance and the fourth distance is 2 mm or more.

[0084] For example, the difference between the third and fourth distances may be 2 mm, 2.2 mm, 2.5 mm, 2.7 mm, 3 mm, 3.3 mm, etc.

[0085] In the embodiments of this application, the difference between the third distance between the first adhesive point 51 and the first edge 13 and the fourth distance between the end of the first connecting wire 30 closest to the first edge 13 and the first edge 13 is set to 2 mm or more. This prevents a short circuit from occurring in the battery string due to the end of the first connecting wire 30 being too close to the first edge 13.

[0086] As one selective embodiment, as shown in Figures 1 to 4, the distance between the finger 20 and the first edge 13 in the first direction K is 0.75 mm.

[0087] In the embodiments of this application, as shown in Figures 1 to 4, the distance between the finger 20 near the first edge 13 and the first edge 13 in the first direction K is set to 0.75 mm. This facilitates the arrangement of the first tip line 40 and the first thick portion 60 between the end of the first tip line 40 near the first edge 13 and the finger 20.

[0088] In one selective embodiment, in the second direction H, the lengths of the first battery cell 10 and the second battery cell are 180 mm or more and 240 mm or less.

[0089] In the embodiments of this application, the lengths of the first battery cell 10 and the second battery cell in the second direction H are 180 mm or more and 240 mm or less. For example, in the second direction H, the lengths of the first battery cell 10 and the second battery cell may be 180 mm, 182 mm, 191.6 mm, 191.75 mm, 192 mm, 210 mm, 220 mm, 230 mm, 240 mm, etc.

[0090] Selectively, the first battery cell 10 and the second battery cell may have a rectangular structure, and the specific dimensions of the first battery cell 10 and the second battery cell with this 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.

[0091] Naturally, the specific structure and dimensions of the first battery cell 10 and the second battery cell are not limited in the embodiments of this application, and any structure and dimensions of the first battery cell 10 and the second battery cell are covered by this application. In actual use, technicians can select suitable battery cells as the first battery cell 10 and the second battery cell as needed.

[0092] This application provides a battery string comprising a first connecting wire and a first battery cell and a second battery cell electrically connected by the first connecting wire, wherein the first connecting wire extends in a first direction to a first surface of the first battery cell, the first battery cell has a first edge and a second edge facing each other in the first direction, the first surface of the first battery cell is provided with a first tip line extending in the first direction, the first tip line is close to the first edge and far from the second edge, a portion of the first connecting wire extends onto the first tip line to form an overlapping portion, the length of the overlapping portion is 40% to 80% of the length of the first tip line. In the embodiment of this application, the battery string is provided with a first tip line extending in a first direction from the first surface of the first battery cell, the first tip line being close to the first edge of the first battery cell and far from the second edge, and a first connecting line extending in a first direction from the first surface of the first battery cell, a portion of the first connecting line extending onto the first tip line to form an overlapping portion, the length of which the overlapping portion accounts for 40% to 80% of the length of the first tip line, thereby allowing the current generated in the region close to the first edge of the first battery cell to be collected by the first tip line, and improving the photoelectric conversion efficiency of the battery cell.

[0093] Figure 7 shows a cross-sectional view 1 of the solar module described in the embodiment of this application, and Figure 8 shows a cross-sectional view 2 of the solar module described in the embodiment of this application.

[0094] As shown in Figures 7 and 8, embodiments of the present application further provide a solar module comprising, in order, a cover plate 70, a first adhesive layer 71, a plurality of battery strings as described in the above embodiments, a second adhesive layer, and a back plate, wherein the plurality of battery strings are arranged at intervals.

[0095] As shown in Figures 7 and 8, embodiments of the present application further provide a solar module comprising a plurality of battery strings described in the above embodiments, wherein the plurality of battery strings are arranged at intervals.

[0096] Here, the cover plate 70 is connected to one side of the battery string by a first adhesive layer 71, and the back plate is connected to the other side of the battery string by a second adhesive layer.

[0097] It should be explained that in the embodiments of this application, the battery string included in the solar module has the same structure as the battery string described in the above embodiments, and its beneficial effects are also the same, so it will not be explained again here.

[0098] As one optional embodiment, as shown in Figures 7 and 8, the first adhesive layer 71 and / or the second adhesive layer is a multilayer composite adhesive layer.

[0099] As shown in Figures 7 and 8, the first adhesive layer 71 and / or the second adhesive layer in the embodiment of this application employ a multilayer composite adhesive layer which may include an EVA layer and a POE layer.

[0100] Here, the EVA layer is an ethylene-vinyl acetate copolymer layer, which has properties such as water resistance, corrosion resistance, and ease of processing such as hot pressing, cutting, adhesive application, and lamination. The POE layer is a high polymer layer of ethylene and octylene, or a high polymer layer of ethylene and butylene.

[0101] As one selective embodiment, as shown in Figure 7, the multilayer composite adhesive layer has a two-layer structure consisting of sequentially laminated EVA layer 711 and POE layer 712.

[0102] As shown in Figure 7, this multilayer composite adhesive layer has a two-layer structure consisting of sequentially laminated EVA layer 711 and POE layer 712. Here, the EVA layer 711 is connected to the battery string. Since the EVA layer 711 is easily hot-pressed, hot-press molding can be performed on the solar module using a hot-press method.

[0103] As one selective embodiment, as shown in Figure 8, the multilayer composite adhesive layer has a three-layer structure consisting of an EVA layer 711, a POE layer 712, and an EVA layer 711, which are laminated in order.

[0104] As shown in Figure 8, this multilayer composite adhesive layer has a three-layer structure consisting of a sequentially laminated EVA layer 711, POE layer 712, and EVA layer 711. 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. This allows the cover plate 70 to be connected to one side of the battery string by the multilayer composite adhesive layer, and the back plate to be connected to the other side of the battery string by the multilayer composite adhesive layer, using a hot press method.

[0105] The embodiments of the apparatus described above are merely illustrative. The units described here as separating members may or may not be physically separated, and the members shown as units may or may not be physical units; that is, they may be located in one place or distributed among multiple network units. Some or all of the modules can be selected as needed to achieve the objectives of the solution of this embodiment. Those skilled in the art will be able to understand and implement this without requiring any creative effort.

[0106] The terms “one embodiment,” “an embodiment,” or “one or more embodiments” as used herein mean that the specific features, structures, or properties described in the embodiment are included in at least one embodiment of this application. Note that the phrase “in one embodiment” does not necessarily refer to the same embodiment. Many specific details are described in the specification provided herein. However, it can be understood that the embodiments of this application may be carried out without these specific details. In some examples, well-known methods, structures, and techniques are not described in detail so as not to obscure the understanding of this specification.

[0107] In the claims, no reference numeral in parentheses should be construed as limiting the claims. The term “including” does not preclude the existence of elements or steps not described in the claims. The terms “one” or “single” preceding an element do not preclude the existence of multiple such elements. This application is implementable by hardware and a computer programmed as appropriate, comprising several different elements. In claims of an element describing multiple devices, some of these devices may be implemented specifically by the same hardware. The use of terms such as “first,” “second,” and “third” does not indicate any order. These terms may be construed as names.

[0108] Finally, it should be noted that the above embodiments are merely for illustrating the technical solutions of this application and do not limit them. Although this application has been described in detail with reference to the above embodiments, it will be understood by those skilled in the art that modifications to the technical solutions described in each of the above embodiments, or equivalent substitutions of some of their technical features, are possible, and such modifications or substitutions will not cause the essence of the relevant technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of this application. [Explanation of Symbols]

[0109] 10. First battery cell 11 1st surface 12 Second surface 13 First edge 14. Second edge 20 Fingers 30. First connection line 31 Bonding layer 40 First Leading Line 41. Second End Line 50 glue points 51 First adhesive point 60 First Section 70 Cover Plate 71 First adhesive layer 711 EVA layer 712 POE layer K Direction 1 H, direction 2

Claims

1. It includes a first connecting wire and a first battery cell and a second battery cell electrically connected by the first connecting wire, The first connecting wire extends in a first direction to the first surface of the first battery cell, and the first battery cell has a first edge and a second edge facing each other in the first direction. The first surface of the first battery cell is provided with a first tip line extending in a first direction, the first tip line being close to the first edge and far from the second edge, A battery string in which a portion of the first connecting wire extends to the first tip wire to form an overlapping portion, and the ratio of the length of the overlapping portion to the length of the first tip wire is 80% or less.

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 tip wire.

3. The battery string according to claim 1, wherein there are multiple first connecting wires and first end wires, and the first connecting wires and first end wires are provided in a one-to-one correspondence.

4. The first surface of the first battery cell is further provided with a plurality of fingers that extend in a second direction and are spaced apart in the first direction, and the second direction intersects the first direction. The battery string according to claim 1, wherein the first tip wire is connected only to the portion of the plurality of fingers closest to the first edge, and the first tip wire is connected to the finger closest to the first edge.

5. The battery string according to claim 4, wherein the first connecting wire has a bonding layer, and the first connecting wire is connected to at least a portion of the finger by 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 by a plurality of spaced-apart adhesive points.

7. The battery string according to claim 1, wherein the length of the first tip wire is less than 1 / 4 of the length of the projection of the first connecting wire in the first battery cell.

8. The battery string according to claim 1, wherein the first surface of the first battery cell further includes a second tip line near the second edge, and the second tip line is covered in whole by the first connecting line.

9. The battery string according to claim 1, wherein in the first direction, the distance between the end of the first connecting wire and the first edge of the first battery cell is 3 mm or more and 8.75 mm or less.

10. Only one adhesive point is provided in the overlapping portion, and this adhesive point is the first adhesive point. In the first direction, the distance between the first adhesive point and the first edge is defined as the third distance, and the distance between the end of the first connecting line and the first edge is defined as the fourth distance. The battery string according to claim 6, wherein the difference between the third distance and the fourth distance is 2 mm or more.

11. The battery string according to claim 1, wherein in the second direction, the lengths of the first battery cell and the second battery cell are 180 mm or more and 240 mm or less.

12. The battery string according to claim 1, wherein the dimensions 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, and (182±2) mm × (105±1) mm.

13. It includes a first connecting wire and a first battery cell and a second battery cell electrically connected by the first connecting wire, The first connecting wire is fixed to the first surface of the first battery cell by a plurality of spaced-apart adhesive points, the first connecting wire extends in a first direction, and the first battery cell has opposing first and second edges in the first direction. The first surface of the first battery cell is provided with a first tip line extending in a first direction, the first tip line being close to the first edge and far from the second edge, A battery string wherein a portion of the first connecting wire extends to the tip wire and forms an overlapping portion, and only one adhesive point is provided in the overlapping portion, the adhesive point is the first adhesive point, the distance between the first adhesive point and the end of the first tip wire near the first edge is defined as the first distance, the distance between the first adhesive point and the end of the first tip wire far from the first edge is defined as the second distance, and the ratio of the first distance to the second distance is 1:5 or more and 2:1 or less.

14. The battery string according to claim 13, wherein the first surface of the first battery cell further includes a second tip line near the second edge, and the second tip line is covered in whole by the first connecting line.

15. The battery string according to claim 14, wherein the second tip wire is provided with at least one of the adhesive points.

16. The battery string according to any one of claims 13 to 15, wherein both ends of the first tip wire are connected to two fingers, and a first thick portion is provided at the connection point with the two fingers, and the first tip wire is electrically connected to the fingers by the first thick portion.

17. The first battery cell further includes a second surface provided opposite the first surface, and the battery string further includes a second connecting wire connected to the second surface. The second connecting wire is connected to the second surface of the first battery cell by a plurality of spaced-apart adhesive points. The battery string according to claim 13, wherein the projections of the plurality of adhesive points on the first battery cell are arranged alternately on the first surface, and the projections of the plurality of adhesive points on the first battery cell are arranged alternately on the second surface.

18. In the first direction, the distance between the first adhesive point and the first edge is defined as the third distance, and the distance between the end of the first connecting line and the first edge is defined as the fourth distance. The battery string according to claim 13, wherein the difference between the third distance and the fourth distance is 2 mm or more.

19. A solar module comprising, in order, a cover plate, a first adhesive layer, a battery string according to any one of claims 1 to 18, a second adhesive layer, and a back plate, wherein the plurality of battery strings are arranged at intervals.

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