CN220873600U - Battery string and photovoltaic module - Google Patents

Abstract

The application discloses a battery string and a photovoltaic module, and belongs to the technical field of photovoltaic modules. The battery string includes: a first connection line and first and second battery pieces electrically connected by the first connection line, wherein the first connection line extends in a first direction on a first surface of the first battery piece, the first battery piece having opposite first and second edges in the first direction; a first end line extending along the first direction is arranged on the first surface of the first battery piece, and is close to the first edge and far away from the second edge; a portion of the first connection line extends onto the first stub to form an overlapping portion, the overlapping portion having a length of 40% to 80% of a length of the first stub.

Description

Battery string and photovoltaic module

Technical Field

The application relates to the technical field of photovoltaic modules, in particular to a battery string and a photovoltaic module.

Background

The battery string is used as a core component of the photovoltaic module, and can convert solar energy into electric energy. Generally, a battery string includes a plurality of battery pieces arranged in sequence, and the surfaces of the battery pieces are provided with a main grid and a fine grid through which current is collected to collect current generated by the battery pieces. The main grid and the fine grid are connected in a cross mode, and the currents collected by the fine grid are collected through the main grid so as to collect the currents generated by the battery pieces together.

In the process of processing the battery strings, the slurry is printed on the surface of the battery piece in a screen printing mode to form a plurality of fine grids and a plurality of main grids which are perpendicular to each other on the surface of the battery piece. And collecting and summarizing the current generated by the battery piece through the plurality of fine grids and the plurality of main grids so as to collect the current generated by the whole battery piece. However, the provision of a plurality of main grids and a plurality of fine grids on the surface of the battery sheet requires a large consumption of slurry, and therefore, increases the cost of the battery sheet. And the fine grid and the main grid can shield the upper surface of the battery piece, so that the efficiency of absorbing light on the upper surface of the battery piece is influenced, and the photoelectric conversion efficiency of the battery piece is influenced.

In the prior art, in order to reduce the production cost of the battery piece, the photoelectric conversion efficiency of the battery piece is improved. The welding strip is arranged at the position of the main grid through only arranging the fine grid on the surface of the battery piece, and the fine grid is connected through the welding strip to collect the current collected by the fine grid.

However, since the solder strip cannot be spread on the surface of the battery piece along the extending direction of the solder strip, the thin grids on two sides of the surface of the battery piece may not be connected to the solder strip along the extending direction of the solder strip, so that part of the current collected by the thin grids cannot be collected on the solder strip, and the photoelectric conversion efficiency of the battery piece is affected.

Disclosure of utility model

The application provides a battery string and a photovoltaic module, which are used for solving or at least partially solving the problems that in the prior art, along the extending direction of a welding strip, thin grids on two sides of the surface of a battery piece possibly cannot be connected with the welding strip, so that partial current collected by the thin grids cannot be collected on the welding strip and the photoelectric conversion efficiency of the battery piece is affected.

In order to solve the technical problems, the application is realized as follows:

In a first aspect, the present application discloses a battery string comprising: a first connection line and first and second battery pieces electrically connected by the first connection line, wherein the first connection line extends in a first direction on a first surface of the first battery piece, the first battery piece having opposite first and second edges in the first direction; a first end line extending along the first direction is arranged on the first surface of the first battery piece, and is close to the first edge and far away from the second edge; a portion of the first connection line extends onto the first stub to form an overlapping portion, the overlapping portion having a length of 40% to 80% of a length of the first stub.

Optionally, the first connecting lines and the first end lines are all multiple, and the first connecting lines and the first end lines are arranged in one-to-one correspondence.

Optionally, the first surface of the first battery piece is further provided with a plurality of fine grids extending along a second direction and spaced along the first direction; wherein the second direction intersects the first direction; the first end line connects only a portion of the plurality of fine bars proximate to the first edge, and the first end line connects the fine bars closest to the first edge.

Optionally, the first connecting line has a bonding layer thereon, and the first connecting line connects at least a portion of the fine grid through the bonding layer.

Optionally, the first connecting line is fixed to the first surface of the first battery piece by a discrete plurality of glue dots.

Optionally, the length of the first terminal wire is less than 1/4 of the projection length of the first connecting wire on the first battery piece.

Optionally, only one glue dot is provided at the overlapping portion, where the glue dot is a first glue dot.

Optionally, a distance between the first glue point and an end portion of the first end line, which is close to the first edge, is a first distance, and a distance between the first glue point and an end portion of the first end line, which is far away from the first edge, is a second distance, wherein a ratio of the first distance to the second distance is 1:5 to 2:1.

Optionally, the first surface of the first battery piece further includes a second terminal line near the second edge, and the second terminal line is entirely covered by the first connecting line.

Optionally, at least one glue point is arranged on the second end line.

Optionally, two thin bars are connected respectively at the both ends of first end line, and with the junction of two thin bars all is provided with first section of thickening, first end line pass through first section of thickening electricity connect in thin bars.

Optionally, the first battery piece further includes a second surface disposed opposite to the first surface, and the battery string further includes a second connection line connected to the second surface; the first connecting wire and the second connecting wire are respectively connected to the first surface and the second surface of the first battery piece through a plurality of glue points; the projection of the plurality of glue points on the first surface on the first battery piece and the projection of the plurality of glue points on the second surface on the first battery piece are arranged in a staggered mode.

Optionally, a distance between an end of the first connection line and the first edge of the first battery piece is greater than or equal to 3mm and less than or equal to 8.75mm along the first direction.

Optionally, along the first direction, a distance between the first glue dot and the first edge is a third distance, and a distance between an 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 2mm.

Optionally, a distance between the fine grid and the first edge is 0.75mm along the first direction.

Optionally, in the second direction, the lengths of the first and second battery pieces are greater than or equal to 180mm and less than or equal to 240mm.

Optionally, the dimensions of the first and second battery pieces include: (182+ -2) mm, (96+ -1) mm, (192+ -2) mm, (91+ -1) mm, (182+ -2) mm (105+ -1) mm.

In a second aspect, the present application discloses a battery string comprising: a first connection line and first and second battery cells electrically connected by the first connection line, wherein the first connection line is fixed on a first surface of the first battery cell by a discrete plurality of glue dots, the first connection line extends along a first direction, the first battery cell has opposite first and second edges in the first direction; a first end line extending along the first direction is arranged on the first surface of the first battery piece, and is close to the first edge and far away from the second edge; the first connecting wire is partially extended to the end wire to form an overlapped part, only one glue point is arranged on the overlapped part, the glue point is a first glue point, the distance between the first glue point and the end part of the first end wire, which is close to the first edge, is a first distance, the distance between the first glue point and the end part of the first end wire, which is far away from the first edge, is a second distance, and the ratio of the first distance to the second distance is 1:5-2:1.

Optionally, the first connecting lines and the first end lines are all multiple, and the first connecting lines and the first end lines are arranged in one-to-one correspondence.

Optionally, the first surface of the first battery piece is further provided with a plurality of fine grids extending along a second direction and spaced along the first direction; wherein the second direction intersects the first direction; the first end line connects only a portion of the plurality of fine bars proximate to the first edge, and the first end line connects the fine bars closest to the first edge.

Optionally, the first connecting line has a bonding layer thereon, and the first connecting line connects at least a portion of the fine grid through the bonding layer.

Optionally, the length of the first terminal wire is less than 1/4 of the projection length of the first connecting wire on the first battery piece.

Optionally, the length of the overlapping portion is 40% to 80% of the length of the first end head line.

Optionally, the first surface of the first battery piece further includes a second terminal line near the second edge, and the second terminal line is entirely covered by the first connecting line.

Optionally, at least one glue point is arranged on the second end line.

Optionally, two thin bars are connected respectively at the both ends of first end line, and with the junction of two thin bars all is provided with first section of thickening, first end line pass through first section of thickening electricity connect in thin bars.

Optionally, the first battery piece further includes a second surface disposed opposite to the first surface, and the battery string further includes a second connection line connected to the second surface; the second connecting wire is connected to the second surface of the first battery piece through a plurality of discrete glue points; the projection of the plurality of glue points on the first surface on the first battery piece and the projection of the plurality of glue points on the second surface on the first battery piece are arranged in a staggered mode.

Optionally, a distance between an end of the first connection line and the first edge of the first battery piece is greater than or equal to 3mm and less than or equal to 8.75mm along the first direction.

Optionally, along the first direction, a distance between the first glue dot and the first edge is a third distance, and a distance between an 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 2mm.

Optionally, a distance between the fine grid and the first edge is 0.75mm along the first direction.

Optionally, in the second direction, the lengths of the first and second battery pieces are greater than or equal to 180mm and less than or equal to 240mm.

Optionally, the dimensions of the first and second battery pieces include: (182+ -2) mm, (96+ -1) mm, (192+ -2) mm, (91+ -1) mm, (182+ -2) mm (105+ -1) mm.

In a third aspect, the application discloses a photovoltaic module, which comprises a cover plate, a first adhesive layer, a plurality of battery strings, a second adhesive layer and a back plate which are sequentially arranged, wherein the battery strings, the second adhesive layer and the back plate are arranged at intervals.

Optionally, the first adhesive layer and/or the second adhesive layer is a multilayer composite adhesive layer.

Optionally, the multilayer composite glue layer is bilayer structure, including EVA layer and POE layer that stacks gradually.

Optionally, the compound glue film of multilayer is three layer construction, including EVA layer, POE layer and EVA layer that stacks gradually.

Optionally, the EVA layer directly contacts the battery string.

The application provides a battery string and a photovoltaic module, wherein the battery string comprises: a first connection line and first and second battery pieces electrically connected by the first connection line, wherein the first connection line extends in a first direction on a first surface of the first battery piece, the first battery piece having opposite first and second edges in the first direction; a first end line extending along the first direction is arranged on the first surface of the first battery piece, and is close to the first edge and far away from the second edge; a portion of the first connection line extends onto the first stub to form an overlapping portion, the overlapping portion having a length of 40% to 80% of a length of the first stub. According to the battery string provided by the embodiment of the application, the first end wire extending along the first direction is arranged on the first surface of the first battery piece, and the first end wire is close to the first edge of the first battery piece and far away from the second edge. The first connecting wire extends along a first direction on the first surface of the first battery piece, a part of the first connecting wire extends to the first terminal wire to form an overlapped part, and the length of the overlapped part accounts for 40-80% of the length of the first terminal wire. Therefore, the current generated by the first battery piece close to the first edge area can be collected through the first end head wire, so that the photoelectric conversion efficiency of the battery piece is improved.

Drawings

Fig. 1 is a schematic structural diagram of a first surface of a first battery sheet according to an embodiment of the present application;

FIG. 2 shows an enlarged view of a portion of a first battery plate according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a first surface of the first battery slice according to an embodiment of the application;

FIG. 4 shows a partial enlarged view B-B of the first battery plate according to an embodiment of the present application;

FIG. 5 is a schematic view showing the structure of the first thickening according to the embodiment of the present application;

fig. 6 is a schematic structural diagram of a second surface of the first battery plate according to an embodiment of the present application;

FIG. 7 shows a cross-sectional view of a photovoltaic module according to an embodiment of the present application;

Fig. 8 shows a second cross-sectional view of the photovoltaic module according to an embodiment of the present application.

Reference numerals:

10: a first battery piece; 11: a first surface; 12: a second surface; 13: a first edge; 14: a second edge;

20: a fine grid;

30: a first connecting line; 31: a bonding layer;

40: a first end head line; 41: a second end line;

50: glue points; 51: a first glue dot;

60, a first thickening section;

70: a cover plate; 71: a first adhesive layer; 711: an EVA layer; 712: a POE layer;

k: a first direction; h: a second direction.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the utility model, are intended to be within the scope of the utility model.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present utility model. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Referring to fig. 1, a schematic diagram of a first surface of a first battery plate according to an embodiment of the present application is shown; referring to fig. 2, there is shown an enlarged partial view A-A of the first battery sheet in an embodiment of the present application; referring to fig. 3, a second schematic structural diagram of the first surface of the first battery slice according to an embodiment of the present application is shown; referring to fig. 4, a partial enlarged view B-B of the first battery sheet in the embodiment of the present application is shown; referring to fig. 5, a schematic structural diagram of the first thickening according to an embodiment of the present application is shown; referring to fig. 6, a schematic structural diagram of the second surface of the first battery plate according to an embodiment of the present application is shown.

As shown in fig. 1 to 4, an embodiment of the present application provides a battery string including: a first connection line 30 and first and second battery pieces 10 and 14 electrically connected through the first connection line 30, wherein the first connection line 30 extends in a first direction K on a first surface 11 of the first battery piece 10, and the first battery piece 10 has opposite first and second edges 13 and 14 in the first direction K; the first surface 11 of the first battery piece 10 is provided with a first end wire 40 extending along the first direction K, and the first end wire 40 is close to the first edge 13 and far from the second edge 14; a portion of the first connecting line 30 extends onto the first stub line 40 to form an overlapping portion, the length of which is 40% to 80% of the length of the first stub line 40.

The embodiment of the application provides a battery string, which comprises a first battery piece 10 and a second battery piece which are arranged at intervals, wherein a first gap exists between the first battery piece 10 and the second battery piece. The first battery piece 10 and the second battery piece each include a first surface and a second surface that are disposed opposite to each other, and the first surface 11 of the first battery piece 10 and the first surface of the second battery piece are disposed toward the same direction.

The first battery piece 10 has a first edge 13 and a second edge 14 opposite to each other along a first direction K, and a first end line 40 extending along the first direction K is disposed on the first surface 11 of the first battery piece 10, where the first end line 40 is close to the first edge 13 and far from the second edge 14.

As shown in fig. 3, the first connection line 30 extends in the first direction K on the first surface 11 of the first battery sheet 10, and a portion of the first connection line 30 extends onto the first terminal line 40 and forms an overlapping portion with the first terminal line 40, the overlapping portion having a length of 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 battery cell 10 and passes through the first gap to be connected to the second surface of the second battery cell. Thereby electrically connecting the first battery cell 10 and the second battery cell through the first connection line 30.

Illustratively, the length of the overlapping portion of the first connecting line 30 and the first headpiece 40 may be 40%, 50%, 60%, 70%, 80%, etc., of the length of the first headpiece 40. The present application is not particularly limited in this regard, and in actual use, a skilled person may set as needed.

It should be noted that, in the embodiment of the present application, the first connecting line 30 and the first terminal line 40 have conductive properties. The first connection line 30 may be a solder strip, a solder wire, or the like. In addition, the metal paste may be printed on a side of the first surface 11 of the first battery sheet 10 near the first edge 13 by means of screen printing to form the first terminal line 40 on the first surface 11 of the first battery sheet 10.

Of course, the above is merely an example of the first connecting line 30 and one way of forming the first terminal line 40, and is not a limitation of the present application. In actual use, the skilled person may select the appropriate first connecting lines 30 as desired, while selecting the appropriate manner of disposing the first terminal lines 40 on the first surface 11 of the first battery sheet 10 as desired.

The battery string provided by the embodiment of the application is formed by arranging the first end wire 40 extending along the first direction K on the first surface 11 of the first battery piece 10, wherein the first end wire 40 is close to the first edge 13 of the first battery piece 10 and far from the second edge 14. The first connection line 30 extends in the first direction K on the first surface 11 of the first battery cell 10, a portion of the first connection line 30 extends onto the first terminal line 40 to form an overlapping portion, and the length of the overlapping portion accounts for 40% to 80% of the length of the first terminal line 40. Thus, the current generated in the area of the first battery piece 10 near the first edge 13 can be collected through the first end wire 40, so as to improve the photoelectric conversion efficiency of the battery piece.

As an alternative embodiment, as shown in fig. 1 and 3, the first connecting lines 30 and the first end wires 40 are plural, and the first connecting lines 30 and the first end wires 40 are disposed in one-to-one correspondence.

In the embodiment of the present application, as shown in fig. 1 and 3, a plurality of first connection lines 30 and first termination lines 40 are provided, and each first connection line 30 is provided corresponding to one first termination line 40. To collect current generated from the first battery cell 10 in the region near the first edge 13 through the plurality of first terminal lines 40 and to conduct the collected current to the corresponding first connection lines 30.

As an alternative embodiment, as shown in fig. 1 to 4, the first surface 11 of the first battery piece 10 is further provided with a plurality of fine grids 20 extending in the second direction H and spaced apart in the first direction K; wherein the second direction H intersects the first direction K; the first end cap line 40 connects only a portion of the plurality of fine bars 20 proximate to the first edge 13, and the first end cap line 40 connects the fine bars 20 closest to the first edge 13.

In the embodiment of the present application, as shown in fig. 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 disposed on the first surface 11 of the first battery piece 10. The current generated by the first surface 11 of the first cell 10 may be collected by a plurality of fine grids 20.

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 of the first connection lines 30 is cross-connected with the plurality of fine grids 20, so that the currents generated by the plurality of fine grids 20 can be collected through the first connection lines 30 to collect the currents generated by the first surfaces 11 of the first battery cells 10 together.

To avoid that the first connection line 30 is electrically connected to other connection lines, resulting in a short circuit of the battery string, a gap exists between the first connection line 30 and the first edge 13 of the first surface 11 of the first battery plate 10. The first connecting line 30 cannot extend to the first edge 13 of the first surface 11 of the first battery sheet 10. Accordingly, a plurality of first terminal lines 40 are provided at one side of the first surface 11 of the first battery sheet 10 near the first edge 13, the first terminal lines 40 are connected to a portion of the fine grid 20 near the first edge 13, and the first terminal lines 40 are connected to the fine grid 20 nearest to the first edge 13 to collect current generated from the portion of the fine grid 20 near the first edge 13 through the first terminal lines 40. And conducts the collected current to the corresponding first connection lines 30 to improve the photoelectric conversion efficiency of the battery cell.

As an alternative embodiment, as shown in fig. 7, the first connection line 30 has a bonding layer 31 thereon, and the first connection line 30 connects at least a portion of the fine grid 20 through the bonding layer 31.

In the embodiment of the present application, as shown in fig. 7, the first connection line 30 has a bonding layer 31 thereon. The bonding layer 31 has conductivity, and the first connection line 30 is connected to at least a part of the fine grid 20 through the bonding layer 31 to conduct the part of the fine grid 20 and the first connection line 30, and the current collected by the part of the fine grid 20 is collected through the first connection line 30.

Illustratively, in the case where the first connection line 30 is a solder ribbon, the bonding layer 31 may be a tin layer. The solder strip is connected to at least a portion of the tin layer by the tin layer.

Of course, in the embodiment of the present application, the first connection line 30 and the bonding layer 31 are not particularly limited, and in actual use, a skilled person may select an appropriate first connection line 30 and bonding layer 31 as needed.

As an alternative embodiment, as shown in fig. 1 and 3, the first connecting line 30 is fixed to the first surface 11 of the first battery sheet 10 by a discrete plurality of glue sites 50.

In the embodiment of the present application, as shown in fig. 1 and 3, a plurality of glue sites 50 are disposed at intervals on the first surface 11 of the first battery plate 10 along the first direction K, and each glue site 50 is at least partially disposed between two adjacent thin grids 20, so as to fix one first connecting wire 30 on the first surface 11 of the first battery plate 10 through the plurality of glue sites 50.

It should be noted that, in the embodiment of the present application, the plurality of first connecting lines 30 may be fixed on the first surface of the first battery piece 10 in the above manner, so as to form a plurality of discrete adhesive dots 50 on the first surface 11 of the first battery piece 10.

As an alternative embodiment, as shown in fig. 1 and 3, the length of the first terminal line 40 is less than 1/4 of the projected length of the first connection line 30 on the first battery sheet 10.

Typically, the first end wire 40 is formed by screen printing a metal paste on the first surface 11 of the first battery piece 10 near the first edge 13. Therefore, in the embodiment of the present application, as shown in fig. 1 and 3, the length of the first terminal line 40 is set to be less than 1/4 of the projected length of the first connection line 30 on the first battery sheet 10. So as to reduce the consumption of metal sizing agent and reduce the production cost of the battery string.

Illustratively, the length of the first terminal line 40 may be set to 1/5 of the projected length of the first connection line 30 on the first battery cell 10, the length of the first terminal line 40 may be set to 1/6 of the projected length of the first connection line 30 on the first battery cell 10, and so on. The present application is not particularly limited in this regard, and in actual use, a skilled person may set as needed.

As an alternative embodiment, as shown in fig. 1 to 4, only one glue site 50 is provided in the overlapping portion, the glue site 50 being a first glue site 51.

In the embodiment of the present application, as shown in fig. 1 to 4, only one glue dot 50 is disposed at the overlapping portion of the first connecting wire 30 and the first terminal wire 40, and the glue dot 50 is a first glue dot 51. One end of the first connecting wire 30 is adhered to one side of the first surface 11 of the first battery piece 10 near the first edge 13 through the first adhesive point 51, and is partially overlapped with the first terminal wire 40. To fix one end of the first connecting wire 30 through the first adhesive dots 51 and, at the same time, electrically connect the first connecting wire 30 and the first terminal wire 40.

As an alternative embodiment, as shown in fig. 3 and 4, the distance between the first glue site 51 and the end of the first end line 40 near the first edge 13 is a first distance, and the distance between the first glue site 51 and the end of the first end line 40 far 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.

As shown in fig. 3 and 4, in the embodiment of the application, the distance between the first glue site 51 and the end of the first end line 40 near the first edge 13 is set to be a first distance, the distance between the first glue site 51 and the end of the first end line 40 far from the first edge 13 is set to be a second distance, and the ratio of the first distance to the second distance is set to be between 1:5 and 2:1. Illustratively, 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, and so forth.

It should be noted that, along the direction perpendicular to the plane of the first battery piece 10, the first glue dot 51 may be circular, square, rectangular, or the like. For example, in the case where the first glue sites 51 are circular, the diameter of the first glue sites 51 may be 1.1mm. 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 near the first edge 13, and 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 far from the first edge 13.

When the first glue sites 51 are rectangular, the size of the first glue sites 51 may be 1mm by 1.2mm. The first distance refers to the distance between the center of the first adhesive point 51 and the end of the first end line 40 near the first edge 13, and the second distance refers to the distance between the center of the first adhesive point 51 and the end of the first end line 40 far from the first edge 13.

As an alternative embodiment, as shown in fig. 1 and 3, the first surface 11 of the first battery piece 10 further includes a second terminal line 41 near the second edge 14, and the second terminal line 41 is entirely covered by the first connecting line 30.

As shown in fig. 1 and 3, in the embodiment of the present application, a second terminal line 41 is disposed on a side of the first surface 11 of the first battery sheet 10 near the second edge 14, the second terminal line 41 extends in the first direction K, and the second terminal line 41 extends to the fine grid 20 nearest to the second edge 14. So that the current collected by the fine grid 20 in the region of the first surface 11 of the first cell 10 near the second edge 14 can be collected by the second terminal line 41.

Wherein the second terminal wire 41 is entirely covered by the first connecting wire 30. That is, the second terminal line 41 is connected to the first connection line 30, so that the current collected by the second terminal line 41 can be conducted to the first connection line 30.

It should be noted that, in the embodiment of the present application, the second terminal line 41 has conductivity, and the metal paste may be printed on the side of the first surface 11 of the first battery piece 10 near the second edge 14 by means of screen printing, so as to form the second terminal line 41 on the first surface 11 of the first battery piece 10. As an alternative embodiment, as shown in fig. 1, at least one glue dot 50 is provided on the second terminal line 41.

As shown in fig. 1, in the embodiment of the present application, at least one glue dot 50 is disposed on the second terminal line 41, so that the first connecting line 30 is fixed on the second terminal line 41 through the at least one glue dot 50, so that the first connecting line 30 covers the second terminal line 41.

As an alternative embodiment, as shown in fig. 2, two ends of the first end wire 40 are respectively connected to two thin grids 20, and the connection parts of the first end wire 40 and the two thin grids 20 are respectively provided with a first thickening section 60, and the first end wire 40 is electrically connected to the thin grids 20 through the first thickening section 60.

As shown in fig. 2, in the embodiment of the present application, two ends of the first end wire 40 are respectively connected to two thin grids 20, and the first thickened sections 60 are disposed at the connection positions of the two ends of the first end wire 40 and the thin grids 20, so that the two ends of the first end wire 40 are electrically connected to the thin grids 20 through one first thickened section 60. To improve the reliability of the connection between the two ends of the first end tip 40 and the fine grid 20.

It should be noted that, in the embodiment of the present application, the first thickening section 60 has conductivity, and the metal paste may be printed on the connection portion between the end portion of the first terminal line 40 and the fine grid 20 by means of screen printing, so as to form the first thickening section 60 at the connection portion between the end portion of the first terminal line 40 and the fine grid 20.

As shown in fig. 5, the first thickening 60 may be of a configuration having a thicker middle and narrow ends. Of course, the first thickening 60 may have other configurations. In the embodiment of the present application, the specific structure of the first thickening 60 is not limited too much, and in actual use, a technician may set it as desired.

As an alternative embodiment, as shown in fig. 7, the first battery piece 10 further includes a second surface 12 disposed opposite to the first surface 11, and the battery string further includes a second connection line connected to the second surface 12; the first connecting wire 30 and the second connecting wire are respectively connected to the first surface 11 and the second surface 12 of the first battery piece 10 through a plurality of glue sites 50; the projection of the plurality of glue points 50 on the first surface 11 on the first battery piece 10 and the projection of the plurality of glue points 50 on the second surface 12 on the first battery piece 10 are arranged in a staggered manner.

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 plate 10, and the plurality of second connection lines extend along the first direction K and are adhered to the second surface 12 of the first battery plate 10 through a plurality of adhesive dots 50.

As shown in fig. 3, a plurality of first connection lines 30 are connected to the first surface 11 of the first battery sheet 10, and the plurality of first connection lines 30 extend in the first direction K and are adhered to the first surface 11 of the first battery sheet 10 through a plurality of adhesive dots 50.

In the processing of the battery string, a plurality of glue sites 50 may be printed on the first surface 11 of the first battery sheet 10, and then a plurality of glue sites 50 may be printed on the second surface 12 of the first battery sheet 10. During printing, since the first surface 11 of the first battery sheet 10 is not supported, the plurality of glue sites 50 on the first surface 11 are avoided. Therefore, the projections of the plurality of glue sites 50 on the second surface 12 on the first battery piece 10 are offset from the projections of the plurality of glue sites 50 on the first surface 11 on the first battery piece 10.

As an alternative embodiment, as shown in fig. 4, a distance between an end of the first connection line 30 and the first edge 13 of the first battery sheet 10 in the first direction K is greater than or equal to 3mm and less than or equal to 8.75mm.

In the embodiment of the present application, as shown in fig. 4, the distance between the end of the first connection line 30 and the first edge 13 of the first battery sheet 10 is set to be greater than or equal to 3mm and less than or equal to 8.75mm in the first direction K. Specifically, the distance between the end of the first connecting line 30 and the first edge 13 of the first battery sheet 10 may be set to 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 8.75mm, and the like.

In the embodiment of the present application, the distance between the end of the first connecting line 30 and the first edge 13 of the first battery sheet 10 is set to be greater than or equal to 3mm and less than or equal to 8.75mm. To avoid that the first connection lines 30 are too close to the first edges 13 of the first battery plates 10, resulting in that the first connection lines 30 are electrically connected to other connection lines, thereby resulting in a short circuit of the battery string.

As an alternative embodiment, as shown in fig. 4, the distance between the first glue sites 51 and the first edges 13 in the first direction K is a third distance, and the distance between the ends of the first connection lines 30 and the first edges 13 is a fourth distance; wherein the difference between the third distance and the fourth distance is greater than or equal to 2mm.

In the embodiment of the present application, as shown in fig. 4, the distance between the first adhesive point 51 and the first edge 13 is set to be the third distance, and the distance between the end of the first connecting line 30 near the first edge 13 and the first edge 13 is set to be the fourth distance along the first direction K. Wherein the difference between the third distance and the fourth distance is greater than or equal to 2mm.

Illustratively, the difference between the third distance and the fourth distance may be 2mm, 2.2mm, 2.5mm, 2.7mm, 3mm, 3.3mm, and so forth.

In the embodiment of the present application, the difference between the third distance between the first glue sites 51 and the first edges 13 and the fourth distance between the end of the first connecting line 30 near the first edges 13 and the first edges 13 is set to be greater than or equal to 2mm. To avoid that the end of the first connecting line 30 is too close to the first edge 13, resulting in a short circuit of the battery string.

As an alternative embodiment, as shown in fig. 1 to 4, the distance between the fine grating 20 and the first edge 13 is 0.75mm in the first direction K.

In the embodiment of the present application, as shown in fig. 1 to 4, the distance between the fine grid 20 near the first edge 13 and the first edge 13 is set to 0.75mm in the first direction K. Such that the first end cap wire 40 and the first thickened section 60 between the end of the first end cap wire 40 proximate the first edge 13 and the fine grid 20 are disposed.

As an alternative embodiment, the lengths of the first and second battery plates 10 and 10 in the second direction H are greater than or equal to 180mm and less than or equal to 240mm.

The lengths of the first battery cell 10 and the second battery cell in the second direction H in the embodiment of the application are greater than or equal to 180mm and less than or equal to 240mm. Illustratively, in the second direction H, the lengths of the first and second battery plates 10, 240mm, and the like may be 180mm, 182mm, 191.6mm, 191.75mm, 192, 210mm, 220mm, 230mm, and the like.

Alternatively, the first battery cell 10 and the second battery cell may have a rectangular structure, and 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 (105+ -1) mm, and the like.

Of course, in the embodiment of the present application, the specific structures and specific dimensions of the first battery piece 10 and the second battery piece are not limited, and any structure and any dimension of the first battery piece 10 and the second battery piece are all within the protection scope of the present application. In actual use, the skilled person may select an appropriate battery sheet as the first battery sheet 10 and the second battery sheet as required.

The present application provides a battery string including: a first connection line and first and second battery pieces electrically connected by the first connection line, wherein the first connection line extends in a first direction on a first surface of the first battery piece, the first battery piece having opposite first and second edges in the first direction; a first end line extending along the first direction is arranged on the first surface of the first battery piece, and is close to the first edge and far away from the second edge; a portion of the first connection line extends onto the first stub to form an overlapping portion, the overlapping portion having a length of 40% to 80% of a length of the first stub. According to the battery string provided by the embodiment of the application, the first end wire extending along the first direction is arranged on the first surface of the first battery piece, and the first end wire is close to the first edge of the first battery piece and far away from the second edge. The first connecting wire extends along a first direction on the first surface of the first battery piece, a part of the first connecting wire extends to the first terminal wire to form an overlapped part, and the length of the overlapped part accounts for 40-80% of the length of the first terminal wire. Therefore, the current generated by the first battery piece close to the first edge area can be collected through the first end head wire, so that the photoelectric conversion efficiency of the battery piece is improved.

Referring to fig. 7, a cross-sectional view of a photovoltaic module according to an embodiment of the present application is shown; referring to fig. 8, a second cross-sectional view of the photovoltaic module according to an embodiment of the present application is shown.

As shown in fig. 7 and fig. 8, the embodiment of the present application further provides a photovoltaic module, which includes a cover plate 70, a first adhesive layer 71, a plurality of battery strings, a second adhesive layer, and a back plate, which are sequentially disposed, where the plurality of battery strings are arranged at intervals.

As shown in fig. 7 and 8, the embodiment of the present application further provides a photovoltaic module, which includes a plurality of the cell strings described in the foregoing embodiments, and the plurality of cell strings are arranged at intervals.

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.

It should be noted that, in the embodiment of the present application, the battery strings included in the photovoltaic module have the same structure as the battery strings described in the above embodiment, and the beneficial effects thereof are also similar, and are not described herein again.

As an alternative embodiment, as shown in fig. 7 and 8, the first adhesive layer 71 and/or the second adhesive layer is a multi-layer composite adhesive layer.

As shown in fig. 7 and 8, the first adhesive layer 71 and/or the second adhesive layer in the embodiment of the present application adopts a multi-layer composite adhesive layer, and the multi-layer composite adhesive layer may include an EVA layer and a POE layer.

The EVA layer is an ethylene-vinyl acetate copolymer layer and has the processing characteristics of water resistance, corrosion resistance, easiness in hot pressing, cutting, gluing, attaching and the like. The POE layer is a high polymer layer of ethylene and octene, or a high polymer layer of ethylene and butene.

As an alternative embodiment, as shown in fig. 7, the multi-layer composite adhesive layer has a double-layer structure, and includes an EVA layer 711 and a POE layer 712 that are sequentially stacked.

As shown in fig. 7, the multilayer composite adhesive layer has a double-layer structure, and includes an EVA layer 711 and a POE layer 712 which are sequentially laminated. Wherein EVA layer 711 is connected to the battery string. The EVA layer 711 is easily hot-pressed so that the photovoltaic module is hot-pressed by the hot-pressing method.

As an alternative embodiment, as shown in fig. 8, the multi-layer composite adhesive layer has a three-layer structure, and includes an EVA layer 711, a POE layer 712, and an EVA layer 711 that are sequentially stacked.

As shown in fig. 8, the multilayer composite adhesive layer has a three-layer structure, and includes an EVA layer 711, a POE layer 712, and an EVA layer 711, which are sequentially stacked. One of the EVA layers 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 a hot press, the cover plate 70 is attached to one side of the battery string by a multi-layer composite adhesive layer, and the back plate is attached to the other side of the battery string by a multi-layer composite adhesive layer.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

While alternative embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including alternative embodiments and all such alterations and modifications as fall within the scope of the embodiments of the utility model.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude that an additional identical element is present in an article or terminal device comprising the element.

While the foregoing has been described in some detail by way of illustration of the principles and embodiments of the utility model, and while in accordance with the principles and implementations of the utility model, those skilled in the art will readily recognize that the utility model is not limited thereto.

Claims (37)

1. A battery string, comprising: a first connection line, and first and second battery pieces electrically connected through the first connection line, wherein,

The first connection line extends in a first direction on a first surface of the first battery piece, the first battery piece having opposite first and second edges along the first direction;

A first end line extending along the first direction is arranged on the first surface of the first battery piece, and is close to the first edge and far away from the second edge;

A portion of the first connection line extends onto the first stub to form an overlapping portion, the overlapping portion having a length of 40% to 80% of a length of the first stub.

2. The battery string of claim 1, wherein the first connecting lines and the first terminal lines are all plural, and the first connecting lines and the first terminal lines are arranged in one-to-one correspondence.

3. The battery string of claim 1, wherein the first surface of the first battery tab is further provided with a plurality of fine bars extending in a second direction and spaced apart along the first direction; wherein the second direction intersects the first direction;

The first end line connects only a portion of the plurality of fine bars proximate to the first edge, and the first end line connects the fine bars closest to the first edge.

4. The battery string of claim 3, wherein the first connection line has a bonding layer thereon, the first connection line being connected to at least a portion of the fine grid through the bonding layer.

5. The battery string of claim 1, wherein the first connection line is secured to the first surface of the first battery tab by a discrete plurality of glue dots.

6. The battery string of claim 1, wherein the length of the first terminal line is less than 1/4 of the projected length of the first connection line on the first battery tab.

7. The battery string of claim 5, wherein only one glue dot is provided in the overlap portion, the glue dot being a first glue dot.

8. The battery string of claim 7, wherein the first glue dot is a first distance from an end of the first terminal line near the first edge and the first glue dot is a second distance from an end of the first terminal line far from the first edge, wherein a ratio of the first distance to the second distance is 1:5 to 2:1.

9. The battery string of claim 1, further comprising a second terminal wire on the first surface of the first battery tab proximate the second edge, the second terminal wire being entirely covered by the first connecting wire.

10. The battery string of claim 9, wherein at least one glue dot is disposed on the second terminal line.

11. The battery string according to any one of claims 1 to 10, wherein two ends of the first terminal line are respectively connected to two thin grids, and first thickened sections are provided at the junctions with the two thin grids, and the first terminal line is electrically connected to the thin grids through the first thickened sections.

12. The battery string of claim 1, wherein the first battery tab further comprises a second surface disposed opposite the first surface, the battery string further comprising a second connection line connected to the second surface;

The first connecting wire and the second connecting wire are respectively connected to the first surface and the second surface of the first battery piece through a plurality of glue points;

The projection of the plurality of glue points on the first surface on the first battery piece and the projection of the plurality of glue points on the second surface on the first battery piece are arranged in a staggered mode.

13. The battery string of claim 1, wherein a distance between an end of the first connection line and a first edge of the first battery tab in the first direction is greater than or equal to 3mm and less than or equal to 8.75mm.

14. The battery string of claim 7, wherein a distance between the first glue sites and the first edge in the first direction is a third distance and a distance between an end of the first connection lines 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 2mm.

15. A battery string according to claim 3, wherein the distance between the fine grid and the first edge in the first direction is 0.75mm.

16. The battery string of claim 1, wherein the first and second battery tabs have a length greater than or equal to 180mm and less than or equal to 240mm in the second direction.

17. The battery string of claim 1, wherein the dimensions of the first and second battery cells comprise: (182+ -2) mm (96+ -1) mm, (192+ -2) mm (91+ -1) mm, (182+ -2) mm (105+ -1) mm.

18. A battery string, comprising: a first connection line, and first and second battery pieces electrically connected through the first connection line, wherein,

The first connecting line is fixed on the first surface of the first battery piece through a plurality of discrete adhesive points, the first connecting line extends along a first direction, and the first battery piece is provided with a first edge and a second edge which are opposite in the first direction;

A first end line extending along the first direction is arranged on the first surface of the first battery piece, and is close to the first edge and far away from the second edge;

The first connecting wire is partially extended to the end wire to form an overlapped part, only one glue point is arranged on the overlapped part, the glue point is a first glue point, the distance between the first glue point and the end part of the first end wire, which is close to the first edge, is a first distance, the distance between the first glue point and the end part of the first end wire, which is far away from the first edge, is a second distance, and the ratio of the first distance to the second distance is 1:5-2:1.

19. The battery string of claim 18, wherein the first connecting lines and the first terminal lines are each plural, and the first connecting lines and the first terminal lines are arranged in one-to-one correspondence.

20. The battery string of claim 18, wherein the first surface of the first battery tab is further provided with a plurality of fine bars extending in a second direction and spaced apart along the first direction; wherein the second direction intersects the first direction;

The first end line connects only a portion of the plurality of fine bars proximate to the first edge, and the first end line connects the fine bars closest to the first edge.

21. The battery string of claim 20, wherein the first connection line has a bonding layer thereon, the first connection line connecting at least a portion of the fine grid through the bonding layer.

22. The battery string of claim 18, wherein the length of the first terminal line is less than 1/4 of the projected length of the first connection line on the first battery tab.

23. The battery string of claim 18, wherein the length of the overlap is 40% to 80% of the length of the first end cap wire.

24. The battery string of claim 18, further comprising a second terminal wire on the first surface of the first battery tab proximate the second edge, the second terminal wire being entirely covered by the first connecting wire.

25. The battery string of claim 24, wherein at least one of the glue sites is disposed on the second terminal line.

26. The battery string of any one of claims 18-25, wherein two ends of the first terminal wire are respectively connected to two thin grids, and a first thickened section is disposed at each connection position between the first terminal wire and the two thin grids, and the first terminal wire is electrically connected to the thin grids through the first thickened section.

27. The battery string of claim 18, wherein the first battery tab further comprises a second surface disposed opposite the first surface, the battery string further comprising a second connection line connected to the second surface;

the second connecting wire is connected to the second surface of the first battery piece through a plurality of discrete glue points;

The projection of the plurality of glue points on the first surface on the first battery piece and the projection of the plurality of glue points on the second surface on the first battery piece are arranged in a staggered mode.

28. The battery string of claim 18, wherein a distance between an end of the first connection line and a first edge of the first battery tab in the first direction is greater than or equal to 3mm and less than or equal to 8.75mm.

29. The battery string of claim 18, wherein a distance between the first glue sites and the first edge in the first direction is a third distance and a distance between an end of the first connection lines 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 2mm.

30. The battery string of claim 20, wherein a distance between the fine grid and the first edge in the first direction is 0.75mm.

31. The battery string of claim 18, wherein the first and second battery tabs have a length greater than or equal to 180mm and less than or equal to 240mm in the second direction.

32. The battery string of claim 18, wherein the dimensions of the first and second battery cells comprise: (182+ -2) mm (96+ -1) mm, (192+ -2) mm (91+ -1) mm, (182+ -2) mm (105+ -1) mm.

33. A photovoltaic module, which is characterized by comprising a cover plate, a first adhesive layer, a plurality of battery strings, a second adhesive layer and a back plate which are sequentially arranged, wherein the battery strings are arranged at intervals.

34. The photovoltaic assembly of claim 33, the first and/or second adhesive layers being a multilayer composite adhesive layer.

35. The photovoltaic module of claim 34, wherein the multilayer composite glue layer is a bilayer structure comprising an EVA layer and a POE layer laminated in sequence.

36. The photovoltaic module of claim 34, the multilayer composite glue layer being of a three-layer structure comprising an EVA layer, a POE layer and an EVA layer laminated in sequence.

37. The photovoltaic module of claim 35 or 36, the EVA layer directly contacting the cell string.