Battery string, photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a battery string, a photovoltaic assembly and a photovoltaic power generation system, the battery string comprises a plurality of battery pieces, the plurality of battery pieces are arranged in sequence, at least one side surface of each battery piece is provided with a plurality of grid lines, the plurality of grid lines comprise a plurality of first grid lines and a plurality of second grid lines, and the plurality of first grid lines and the plurality of second grid lines are arranged in parallel. The plurality of first grid lines and the plurality of second grid lines extend in the arrangement direction of the plurality of battery pieces, the plurality of first grid lines and the plurality of second grid lines are alternately arranged at intervals in the direction perpendicular to the arrangement direction of the plurality of battery pieces, and the polarity of the second grid lines is opposite to that of the first grid lines; and two adjacent battery pieces are electrically connected through the conductive connecting pieces. According to the battery string provided by the utility model, the loss of current transmission is reduced, and the photoelectric conversion efficiency of the battery string is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially is related to a battery string, photovoltaic module and photovoltaic power generation system. BACKGROUND

[0002] In the related art, the battery string includes a plurality of photovoltaic cell pieces connected in sequence. The photovoltaic cell piece is provided with a plurality of main grid lines and a plurality of auxiliary grid lines. The auxiliary grid line is mainly used for collecting current, and the current collected by the auxiliary grid is collected to the main grid and then led out through the welding strip to realize the electrical connection between the cell pieces, thereby facilitating the use of the cell pieces. However, the conventional battery string has the defect that the current transmission loss in the auxiliary grid line is high, which will result in low efficiency of the battery string. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. Therefore, one purpose of the utility model is to provide a battery string, which reduces the current transmission loss and improves the photoelectric conversion efficiency of the battery string.

[0004] A second purpose of the utility model is to provide a photovoltaic module using the above-mentioned battery string.

[0005] A third purpose of the utility model is to provide a photovoltaic power generation system using the above-mentioned battery string or photovoltaic module.

[0006] According to the battery string of the first aspect of the utility model, a plurality of cell pieces are arranged in sequence, at least one side surface of the cell piece is provided with a plurality of grid lines, the plurality of grid lines include a plurality of first grid lines and a plurality of second grid lines, the plurality of first grid lines and the plurality of second grid lines extend along the arrangement direction of the plurality of cell pieces, the plurality of first grid lines and the plurality of second grid lines are alternately and spaced arranged along the direction perpendicular to the arrangement direction of the plurality of cell pieces, the polarity of the second grid line is opposite to that of the first grid line; and the adjacent two cell pieces are electrically connected through the conductive connecting piece.

[0007] According to the battery string of the first aspect of the utility model, by arranging the first grid line and the second grid line extending along the extension direction of the battery string, the current collection can be conducted to the conductive connecting piece through the line, the current transmission loss in the auxiliary grid is avoided, the photoelectric conversion efficiency of the battery string is improved, and the use performance of the battery string is improved. In addition, the types of the conductive connecting piece are enriched, different conductive connecting pieces can be selected to meet different use requirements. Moreover, the conductive connecting piece realizes the electrical connection between the plurality of cell pieces, thereby facilitating the normal use of the battery string and improving the use performance of the battery string.

[0008] According to some embodiments of the utility model, multiple battery pieces include first battery piece, second battery piece and third battery piece which are arranged in sequence, the conductive connecting piece is multiple, multiple conductive connecting piece includes: multiple first conductive connecting piece, multiple second grid line of first battery piece and multiple first grid line of second battery piece are electrically connected through multiple first conductive connecting piece respectively, multiple second conductive connecting piece, multiple second grid line of second battery piece and multiple first grid line of third battery piece are electrically connected through multiple second conductive connecting piece respectively.

[0009] According to some embodiments of the utility model, one end of first grid line and second grid line along the arrangement direction of battery piece is first end, the other end of first grid line and second grid line along the arrangement direction of battery piece is second end, the first end of first grid line is adjacent to one side edge of battery piece along the arrangement direction of battery piece, the second end of second grid line is adjacent to the other side edge of battery piece along the arrangement direction of battery piece, both ends of first conductive connecting piece extend to first battery piece and second battery piece respectively and are electrically connected with corresponding second grid line of first battery piece and corresponding first grid line of second battery piece, both ends of second conductive connecting piece extend to second battery piece and third battery piece respectively and are electrically connected with corresponding second grid line of second battery piece and corresponding first grid line of third battery piece.

[0010] According to some embodiments of the utility model, both ends of first conductive connecting piece are spaced apart from the second end of first grid line of first battery piece and the first end of second grid line of second battery piece along the arrangement direction of multiple battery pieces respectively, both ends of second conductive connecting piece are spaced apart from the second end of first grid line of second battery piece and the first end of second grid line of third battery piece along the arrangement direction of multiple battery pieces respectively.

[0011] According to some embodiments of the utility model, the width of the first end of first grid line is greater than or equal to the width of the rest of first grid line except the first end, or the first end of first grid line is provided with Pad point, the width of the second end of second grid line is greater than or equal to the width of the rest of second grid line except the second end, or the second end of second grid line is provided with Pad point.

[0012] According to some embodiments of the present application, the distance between the first end of the first grid line and the side edge of the battery piece along the arrangement direction of the battery piece is d1, wherein the d1 satisfies: 3mm≤d1≤10mm; and / or, the distance between the second end of the second grid line and the other side edge of the battery piece along the arrangement direction of the battery piece is d2, wherein the d2 satisfies: 3mm≤d2≤10mm.

[0013] According to some embodiments of the present application, the conductive connecting piece is a solder strip or a conductive wire.

[0014] According to some embodiments of the present application, the cross-sectional shape of the conductive connecting piece is circular, elliptical, oblong or polygonal.

[0015] According to some embodiments of the present application, the length of the first conductive connecting piece is L1, wherein the L1 satisfies: 9mm≤L1≤20mm; and / or, the length of the second conductive connecting piece is L2, wherein the L2 satisfies: 9mm≤L2≤20cm.

[0016] According to some embodiments of the present application, the ratio of the width of the first conductive connecting piece to the width of the grid line is a, and the a satisfies: 1≤a≤100; and / or, the ratio of the width of the second conductive connecting piece to the width of the grid line is b, and the b satisfies: 1≤b≤100.

[0017] According to some embodiments of the present application, the plurality of battery pieces comprises a first battery piece, a second battery piece and a third battery piece arranged in sequence; the conductive connecting piece is a plurality of conductive connecting pieces, and the plurality of conductive connecting pieces comprises: a third conductive connecting piece, the plurality of second grid lines of the first battery piece and the plurality of first grid lines of the second battery piece are electrically connected through the third conductive connecting piece; and a fourth conductive connecting piece, the plurality of second grid lines of the second battery piece and the plurality of first grid lines of the third battery piece are electrically connected through the fourth conductive connecting piece.

[0018] According to some embodiments of the present application, one end of the first and second grid lines along the arrangement direction of the battery piece is a first end, the other end of the first and second grid lines along the arrangement direction of the battery piece is a second end, the first end of the first grid line is adjacent to one side edge of the battery piece along the arrangement direction of the battery piece, the second end of the second grid line is adjacent to the other side edge of the battery piece along the arrangement direction of the battery piece, and the two sides of the third conductive connecting piece in the width direction extend to the first and second battery pieces respectively and are electrically connected with the corresponding second grid line of the first battery piece and the corresponding first grid line of the second battery piece; the two sides of the fourth conductive connecting piece in the width direction extend to the second and third battery pieces respectively and are electrically connected with the corresponding second grid line of the second battery piece and the corresponding first grid line of the third battery piece.

[0019] According to some embodiments of the present application, the third and fourth conductive connecting pieces are bus bars or conductive adhesive tapes.

[0020] According to some embodiments of the present application, the width of the third conductive connecting piece along the arrangement direction of the battery piece is w1, wherein the w1 satisfies 6mm≤w1≤20mm; and / or, the width of the fourth conductive connecting piece along the arrangement direction of the battery piece is w2, wherein the w2 satisfies 6mm≤w2≤20mm.

[0021] According to some embodiments of the present application, the width of the third conductive connecting piece overlapping with the adjacent battery piece is w3, wherein the w3 satisfies 3mm≤w3≤10mm; and / or, the width of the fourth conductive connecting piece overlapping with the adjacent battery piece is w4, wherein the w4 satisfies 3mm≤w4≤10mm.

[0022] According to some embodiments of the present application, at least a part of the conductive connecting piece is located at the gap between two adjacent battery pieces.

[0023] The photovoltaic module according to the second aspect of the present application comprises the battery string according to the first aspect of the present application.

[0024] The photovoltaic power generation system according to the third aspect of the present application comprises the battery string according to the first aspect of the present application or the photovoltaic module according to the second aspect of the present application.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:

[0027] Figure 1 is a schematic view of a battery piece of a battery string according to another embodiment of the present utility model;

[0028] Figure 2 is a schematic view of a battery piece of a battery string according to another embodiment of the present utility model;

[0029] Figure 3 is a schematic view of a battery piece of a battery string according to an embodiment of the present utility model, wherein a Pad point is provided on the first and second grid lines;

[0030] Figure 4 is a schematic view of a battery string according to an embodiment of the present utility model;

[0031] Figure 5 is a schematic view of a battery string according to another embodiment of the present utility model;

[0032] Figure 6 is a schematic view of a battery piece of a battery string according to another embodiment of the present utility model;

[0033] Figure 7 is a schematic view of a battery string according to another embodiment of the present utility model.

[0034] Reference signs:

[0035] 100, battery string;

[0036] 1, battery piece; 11, first battery piece; 12, second battery piece; 13, third battery piece;

[0037] 2, grid line; 21, first grid line; 22, second grid line;

[0038] 221, first end; 222, second end; 23, Pad point;

[0039] 3, conductive connecting piece; 31, first conductive connecting piece; 32, second conductive connecting piece;

[0040] 33, third conductive connecting piece; 34, fourth conductive connecting piece. DETAILED DESCRIPTION

[0041] The embodiments of the present utility model will be described in detail below, and the embodiments described with reference to the drawings are exemplary, and the following description is made with reference to Figures 1-5 The battery string 100 according to the first aspect embodiment of the present utility model is described.

[0042] AsFigure 4 and Figure 5 As shown in the drawings, the battery string 100 according to the first aspect of the present application comprises a plurality of battery pieces 1 and a conductive connecting piece 3.

[0043] Specifically, the plurality of battery pieces 1 are arranged in sequence, and a plurality of grid lines 2 are arranged on at least one side surface of the battery piece 1. The plurality of grid lines 2 comprise a plurality of first grid lines 21 and a plurality of second grid lines 22. The plurality of first grid lines 21 and the plurality of second grid lines 22 both extend along the arrangement direction of the plurality of battery pieces 1. The plurality of first grid lines 21 and the plurality of second grid lines 22 are alternately and spacedly arranged along a direction perpendicular to the arrangement direction of the plurality of battery pieces 1. The polarity of the second grid line 22 is opposite to that of the first grid line 21.

[0044] For example, in the example of Figure 4 and Figure 5 , the plurality of battery pieces 1 are arranged along the up-down direction, and the arrangement direction of the battery piece 1 is also the up-down direction in Figure 4 . The plurality of first grid lines 21 and the plurality of second grid lines 22 are both arranged on the back surface of the battery piece 1, and the first grid line 21 and the second grid line 22 both extend along the up-down direction, that is, the extension direction of the first grid line 21 and the second grid line 22 is the same as the arrangement direction of the plurality of battery pieces 1 when the plurality of battery pieces 1 are connected into the battery string 100. The plurality of first grid lines 21 and the plurality of second grid lines 22 are alternately and spacedly arranged along the left-right direction. For example, when the first grid line 21 is a positive grid line 2, the second grid line 22 is a negative grid line 2. Similarly, when the first grid line 21 is a negative grid line 2, the second grid line 22 is a positive grid line 2. The extension direction of the battery string 100 is also the arrangement direction of the plurality of battery pieces 1, for example, the up-down direction in Figure 4 .

[0045] The extension direction of the first grid line 21 and the second grid line 22 in the application is the same as the extension direction of the main grid line 2 in the prior art. It can also be understood that the battery piece 1 in the application is a battery piece without a sub-grid, and the battery piece 1 is only provided with the main grid line 2 which has the same extension direction as the traditional solder strip. In this way, compared with the prior art, the battery piece 1 only retains the first grid line 21 and the second grid line 22 made of a material with conductivity, and the current collection can be conducted to the solder strip or the conductive wire and other conductive materials through the grid line 2, thereby avoiding the loss of current transmission through the sub-grid. That is, the first grid line 21 and the second grid line 22 in the application have the functions of collecting current and collecting current, and when a plurality of battery pieces 1 are connected into a battery string 100, the electrical connection of the battery pieces 1 can be realized through the electrical connection of the corresponding grid lines 2 of the plurality of battery pieces 1, thereby improving the photoelectric conversion efficiency of the battery pieces 1 and the battery string 100 and improving the use performance of the battery pieces 1. In addition, when a plurality of battery pieces 1 are connected, the corresponding insulating glue and tin paste are not required, thereby avoiding the reliability risk of the new material and simplifying the production process of the battery string 100. The current collection on the battery piece directly reaches the first grid line and the second grid line, thereby avoiding the resistance loss caused by the current collection through the sub-grid and improving the power output of the battery string.

[0046] In combination with Figure 4 and Figure 5 , the adjacent two battery pieces 1 are electrically connected through the conductive connecting piece 3. For example, the conductive connecting piece 3 can be provided in various forms, such as a traditional solder strip stacked on the main grid, or a conductive wire, or a bus bar, or a conductive adhesive tape, etc. Specifically, the electrical connection of the grid lines 2 between the adjacent two battery pieces 1 can be realized. It should be noted that when the adjacent two battery pieces 1 are connected, the positive grid line 2 of any battery piece 1 is electrically connected with the negative grid line 2 of the adjacent battery piece 1, so as to realize the series connection of the plurality of battery pieces 1. In this way, the types of the conductive connecting piece 3 are diversified, and different conductive connecting pieces 3 can be selected to meet different use requirements. In addition, the conductive connecting piece 3 realizes the electrical connection between the plurality of battery pieces 1, thereby being beneficial to the normal use of the battery string 100 and improving the use performance of the battery string 100.

[0047] According to the battery string 100 of the first aspect of the application, the first grid line 21 and the second grid line 22 extending along the extension direction of the battery string 100 are arranged, the current collection can be conducted to the conductive connecting piece 3 through the grid line, thereby avoiding the loss of current transmission through the sub-grid, improving the photoelectric conversion efficiency of the battery string 100, and improving the use performance of the battery string 100. In addition, the types of the conductive connecting piece 3 are diversified, and different conductive connecting pieces 3 can be selected to meet different use requirements. Moreover, the conductive connecting piece 3 realizes the electrical connection between the plurality of battery pieces 1, thereby being beneficial to the normal use of the battery string 100 and improving the use performance of the battery string 100.

[0048] According to some embodiments of the present application, in combination with Figure 4 and Figure 7 The plurality of battery pieces 1 includes a first battery piece 11, a second battery piece 12 and a third battery piece 13 arranged in sequence. The plurality of conductive connecting pieces 3 includes a plurality of first conductive connecting pieces 31 and a plurality of second conductive connecting pieces 32, the plurality of second grid lines 22 of the first battery piece 11 and the plurality of first grid lines 21 of the second battery piece 12 are respectively electrically connected through the plurality of first conductive connecting pieces 31, and the plurality of second grid lines 22 of the second battery piece 12 and the plurality of first grid lines 21 of the third battery piece 13 are respectively electrically connected through the plurality of second conductive connecting pieces 32.

[0049] For example, in the example of Figure 4 and Figure 7 The battery string 100 is taken as an example of three battery pieces 1, and the first battery piece 11, the second battery piece 12 and the third battery piece 13 are arranged in sequence from top to bottom. Taking the second battery piece 12 as an example, the upper ends of the plurality of first grid lines 21 on the second battery piece 12 are respectively electrically connected with the lower ends of the plurality of second grid lines 22 of the first battery piece 11 upstream in the arrangement direction, and the lower ends of the plurality of second grid lines 22 on the second battery piece 12 are respectively electrically connected with the upper ends of the plurality of first grid lines 21 of the third battery piece 13 downstream in the arrangement direction. That is, the upper end of the first grid line 21 of each battery piece 1 in the battery string 100 is connected with the lower end of the second grid line 22 of the previous battery piece 1, and the lower end of the second grid line 22 of each battery piece 1 is connected with the upper end of the first grid line 21 of the next battery piece 1. When the number of battery pieces 1 exceeds three, the series connection of the plurality of battery pieces 1 can be realized through the plurality of first conductive connecting pieces 31 and the plurality of second conductive connecting pieces 32, for example, the plurality of first conductive connecting pieces 31 between the adjacent two battery pieces 1 form a group, the plurality of second conductive connecting pieces 32 between the adjacent two battery pieces 1 form a group, and the plurality of first conductive connecting pieces 31 and the plurality of second conductive connecting pieces 32 are arranged alternately and spaced apart in sequence to realize the electrical connection between the plurality of battery pieces 1. In addition, the plurality of first conductive connecting pieces 31 do not interfere with each other, and the plurality of second conductive connecting pieces 32 also do not interfere with each other, which ensures the connection accuracy of the series connection of the plurality of battery pieces 1, improves the production efficiency of the battery string 100, and improves the use performance of the battery piece 1.

[0050] According to some embodiments of the present application, in combination with Figure 5 and Figure 6, the first end 221 of the first busbar 21 and the second end 222 of the second busbar 22 are located at the same side of the solar cell 1 along the arrangement direction of the solar cell 1, and the first end 221 of the second busbar 22 and the second end 222 of the first busbar 21 are located at the same side of the solar cell 1 along the arrangement direction of the solar cell 1.

[0051] In combination Figure 5 and Figure 6 , the first end 221 of the first busbar 21 extends beyond the first end 221 of the second busbar 22, and the second end 222 of the second busbar 22 extends beyond the second end 222 of the first busbar 21.

[0052] For example, in the example of Figure 5 and Figure 6 , the upper end of the first busbar 21 and the second busbar 22 is the first end 221, and the lower end of the first busbar 21 and the second busbar 22 is the second end 222. The distance between the first end 221 of the first busbar 21 and the upper side edge of the solar cell 1 is less than the distance between the first end 221 of the second busbar 22 and the upper side edge of the solar cell 1, and the distance between the second end 222 of the first busbar 21 and the lower side edge of the solar cell 1 is greater than the distance between the second end 222 of the second busbar 22 and the lower side edge of the solar cell 1. For example, the material of the busbar 2 of the present application can use silver and other materials that are easy to sinter and conduct electricity, achieving the effect of reducing silver.

[0053] In this way, on the one hand, while ensuring the current collecting ability of the first busbar 21 and the second busbar 22, the first busbar 21 and the second busbar 22 can be distinguished, thereby facilitating the connection of multiple solar cells 1, improving the connection accuracy and connection efficiency of multiple solar cells 1, and further improving the manufacturing efficiency of the battery string 100. On the other hand, when two adjacent solar cells 1 are connected, the first busbar 21 of each solar cell 1 is connected to the second busbar 22 of the adjacent solar cell 1, such as Figure 1 and Figure 2As shown, the distance between the upper end of the first grid line 21 and the lower end of the second grid line 22 of another battery piece 1 located above the battery piece 1 is close, and the distance between the lower end of the second grid line 22 and the upper end of the first grid line 21 of another battery piece 1 located below the battery piece 1 is close, thereby shortening the distance between the end of the first grid line 21 and the end of the second grid line 22 of the two adjacent battery pieces 1, more conducive to the electrical connection of the two adjacent battery pieces 1, and reducing the assembly difficulty of the battery string 100 and improving the production efficiency. Moreover, when the conductive connecting piece 3 is connected with the corresponding grid lines 2 of the two adjacent battery pieces 1, it is not necessary to insulate with other adjacent grid lines 2, thereby reducing the use of insulating glue. That is, the conductive connecting piece 3 only needs to be electrically connected with the corresponding grid lines 2, and does not need to be insulated with other grid lines 2. It should be noted that when the end of the first grid line 21 and the end of the second grid line 22 of the staggered battery piece 1 are connected with the adjacent battery piece 1, the conductive connecting piece 3 can be in various forms, such as a solder strip, a conductive wire and a bus bar, thereby reducing the setting requirements for the conductive connecting piece 3.

[0054] According to some embodiments of the present application, in combination with Figure 5 and Figure 6 , the first end 221 of the first grid line 21 is adjacent to one side edge of the battery piece 1 along the first direction, and the second end 222 of the second grid line 22 is adjacent to the other side edge of the battery piece 1 along the first direction.

[0055] For example, in the examples of Figure 5 and Figure 6 , the upper end of the first grid line 21 is adjacent to the upper side edge of the battery piece 1, and the lower end of the second grid line 22 is adjacent to the lower side edge of the battery piece 1. In this way, on the one hand, the length of the first grid line 21 and the second grid line 22 is increased, thereby increasing the area occupied by the plurality of first grid lines 21 and the plurality of second grid lines 22 on the battery piece 1, and improving the photoelectric conversion capability of the battery piece 1. On the other hand, it is conducive to the connection between the first grid line 21 and the second grid line 22 of the adjacent battery piece 1, and also conducive to the connection between the second grid line 22 and the first grid line 21 of the adjacent battery piece 1, thereby further facilitating the connection of the plurality of battery pieces 1.

[0056] Referring to Figure 4 , the two ends of the first conductive connecting piece 31 respectively extend to the first battery piece 11 and the second battery piece 12 and are electrically connected with the corresponding second grid line 22 of the first battery piece 11 and the corresponding first grid line 21 of the second battery piece 12. The two ends of the second conductive connecting piece 32 respectively extend to the second battery piece 12 and the third battery piece 13 and are electrically connected with the corresponding second grid line 22 of the second battery piece 12 and the corresponding first grid line 21 of the third battery piece 13.

[0057] For example, in the examples of Figure 4In the example shown in FIG. 1, the upper ends of the plurality of first conductive connectors 31 are electrically connected to the second ends 222 of the plurality of second busbars 22 of the first battery piece 11 respectively, and the lower ends of the plurality of first conductive connectors 31 are electrically connected to the first ends 221 of the plurality of first busbars 21 of the second battery piece 12 respectively. The upper ends of the plurality of second conductive connectors 32 are electrically connected to the second ends 222 of the plurality of second busbars 22 of the second battery piece 12 respectively, and the lower ends of the plurality of second conductive connectors 32 are electrically connected to the first ends 221 of the plurality of first busbars 21 of the third battery piece 13 respectively. It should be noted that the length of the first conductive connector 31 can be the distance between the first end 221 of the corresponding first busbar 21 and the second end 222 of the corresponding second busbar 22 of the adjacent two battery pieces 1, of course, the two ends of the first conductive connector 31 can extend to the corresponding first busbar 21 and second busbar 22 respectively, so as to increase the contact area of the first conductive connector 31 and the corresponding busbar 2. The length of the second conductive connector 32 can be the distance between the first end 221 of the corresponding first busbar 21 and the second end 222 of the corresponding second busbar 22 of the adjacent two battery pieces 1, of course, the two ends of the first conductive connector 31 can extend to the corresponding first busbar 21 and second busbar 22 respectively.

[0058] In this way, the length of each first conductive connector 31 and each second conductive connector 32 is shortened, compared with the traditional solder strip, the material of the first conductive connector 31 and the second conductive connector 32 is saved, the use cost is reduced, thereby the processing cost of the battery string 100 is reduced. In addition, when the plurality of battery pieces 11 are connected, the corresponding insulating glue and tin paste are not required to be used, the reliability risk of the new material is avoided, and the production process of the battery string 100 is simplified.

[0059] According to some embodiments of the present application, referring to Figure 4 , the two ends of the first conductive connector 31 are spaced apart along the arrangement direction of the plurality of battery pieces 1 respectively from the second end 222 of the first busbar 21 of the first battery piece 11 and the first end 221 of the second busbar 22 of the second battery piece 12. The two ends of the second conductive connector 32 are spaced apart along the arrangement direction of the plurality of battery pieces 1 (i.e. the up-down direction in Figure 4

[0060] ​That is, the length of the first conductive connecting piece 31 is less than the distance between the lower end of the first grid line 21 on the first battery piece 11 and the upper end of the corresponding second grid line 22 on the second battery piece 12. The above-mentioned corresponding refers to the first grid line 21 and the second grid line 22 opposite along the arrangement direction of the battery piece 1. The length of the second conductive connecting piece 32 is less than the distance between the lower end of the first grid line 21 on the second battery piece 12 and the upper end of the corresponding second grid line 22 on the third battery piece 13. In this way, the arrangement of the first conductive connecting piece 31, the second conductive connecting piece 32, the first grid line 21 and the second grid line 22 is reasonable, which can avoid the short circuit of the battery piece 1 caused by the mis-touch of the first grid line 21 and the second grid line 22 on the same battery piece 1, thereby improving the connection accuracy and use safety of the battery string 100.

[0061] According to some embodiments of the present application, the width of the first end 221 of the first grid line 21 is greater than or equal to the width of the rest of the first grid line 21 except the first end 221, or the first end 221 of the first grid line 21 is provided with a Pad point 23. The width of the second end 222 of the second grid line 22 is greater than or equal to the width of the rest of the second grid line 22 except the second end 222, or the second end 222 of the second grid line 22 is provided with a Pad point 23.

[0062] For example, the width of the first end 221 of the first grid line 21 is greater than the width of the rest of the first grid line 21 except the first end 221. The width of the second end 222 of the second grid line 22 is greater than the width of the rest of the second grid line 22 except the second end 222. That is, the end of the first grid line 21 connected with the second grid line 22 of the adjacent battery piece 1 is thicker, and the end of the second grid line 22 connected with the first grid line 21 of the adjacent battery piece 1 is thicker. In this way, when the plurality of battery pieces 1 are connected, the contact area of the first grid line 21 and the second grid line 22 with the corresponding conductive connecting piece 3 is increased, so that the connection of the first grid line 21, the second grid line 22 and the conductive connecting piece 3 is more firm, the connection stability of the plurality of battery pieces 1 is improved, and the battery string 100 is used stably for a long time. At the same time, the area occupied by the first grid line 21 and the second grid line 22 on the surface of the battery piece 1 is also increased, which further improves the electrical performance of the battery piece 1. In addition, the connection accuracy requirement of the conductive connecting piece 3 with the first grid line 21 and the second grid line 22 is also reduced, the processing difficulty of the battery string 100 is reduced, and the processing efficiency is improved.

[0063] In combination with Figure 3 and Figure 6The first end 221 of the first grid line 21 and the second end 222 of the second grid line 22 are respectively provided with a pad point 23. In this way, when the plurality of battery pieces 1 are connected, the contact area of the first grid line 21 and the second grid line 22 with the corresponding conductive connecting piece 3 is increased, so that the connection of the first grid line 21, the second grid line 22 and the conductive connecting piece 3 is more firm, the connection stability of the plurality of battery pieces 1 is improved, and the long-term stable use of the battery string 100 is facilitated. In addition, the connection precision of the conductive connecting piece 3 and the first grid line 21 and the second grid line 22 is also reduced, the processing difficulty of the battery string 100 is reduced, and the processing efficiency is improved. It should be noted that the shape of the pad point can be set according to the specific use, for example, it can be set to a circular or square shape.

[0064] According to some embodiments of the present application, in combination Figure 5 The distance between the first end 221 of the first grid line 21 and the side edge of the battery piece 1 along the arrangement direction of the battery piece 1 is d1, wherein d1 satisfies: 3mm≤d1≤10mm; and / or the distance between the second end 222 of the second grid line 22 and the other side edge of the battery piece 1 along the arrangement direction of the battery piece 1 is d2, wherein d2 satisfies: 3mm≤d2≤10mm.

[0065] That is, when the first end 221 of the first grid line 21 protrudes from the first end 221 of the second grid line 22 and is arranged closer to the edge of the battery piece 1, when the second end 222 of the second grid line 22 protrudes from the second end 222 of the first grid line 21 and is arranged closer to the edge of the battery piece 1, the arrangement of the end of the first end 221 of the first grid line 21 and the end of the second end 222 of the second grid line 22 meets the above requirements, so as to facilitate the electrical connection between the adjacent two battery pieces 1. For example, as shown in Figure 4 The short solder strip can be used for laminated alloy. In this way, the insulation is ensured, and the insulating glue does not need to be used, which is more conducive to the manufacturing of the battery string 100. In addition, as shown in Figure 5 The conductive connecting piece 3 does not need to completely cover the corresponding grid line 2, the length of the conductive connecting piece 3 is shortened, the processing of the battery string 100 is simplified, and the production cost of the battery string 100 is reduced.

[0066] According to some embodiments of the present application, the conductive connecting piece 3 is a solder strip or a conductive wire. In this way, the conductive connecting piece 3 has good conductivity, which is conducive to the electrical connection between the battery pieces 1. In addition, the solder strip or the conductive wire has a wide source of materials and is easy to obtain, which facilitates the processing and use of the battery string 100.

[0067] Optionally, the cross-sectional shape of the conductive connecting piece 3 is circular, oval, oblong or polygonal. In this way, the conductive connecting piece 3 can be set in different shapes according to the use requirements to meet better application. In addition, it also increases the possibility of shape selection of the conductive connecting piece 3, and improves the applicability of the battery piece 1.

[0068] According to some embodiments of the present application, in combination with Figure 4 , the length of the first conductive connecting piece 31 is L1, wherein L1 satisfies: 9mm≤L1≤20mm; and / or, the length of the second conductive connecting piece 32 is L2, wherein L2 satisfies: 9mm≤L2≤20mm.

[0069] For example, in Figure 4 example, the length of the first conductive connecting piece 31 along the direction in which the plurality of battery pieces 1 are arranged is L1, and the length of the second conductive connecting piece 32 along the direction in which the plurality of battery pieces 1 are arranged is L2. A part of the first conductive connecting piece 31 is located at the gap between the first battery piece 11 and the second battery piece 12, and a part of the first conductive connecting piece 31 overlaps the corresponding first battery piece 11 and second battery piece 12. Therefore, by limiting the length of the first conductive connecting piece 31 and the second conductive connecting piece 32 to meet the above requirements respectively, the size of the first conductive connecting piece 31 and the second conductive connecting piece 32 is set reasonably, which is conducive to the electrical connection of adjacent battery pieces 1, and also can reduce the gap between the battery pieces 1, thereby being more conducive to the arrangement and connection of the battery string 100. In addition, the length of the first conductive connecting piece 31 and the second conductive connecting piece 32 is also greatly shortened, and the first conductive connecting piece 31 and the second conductive connecting piece 32 do not need to cover a large area on the corresponding grid line 2, which is more conducive to the electrical connection of the battery piece 1.

[0070] According to some embodiments of the present application, the ratio of the width of the first conductive connecting piece 31 to the width of the grid line 2 is a, and a satisfies: 1≤a≤100; and / or, the ratio of the width of the second conductive connecting piece 32 to the width of the grid line 2 is b, and b satisfies: 1≤b≤100. For example, when the width of the grid line 2 is 0.01mm, the width of the first conductive connecting piece 31 can be set to 1mm. In this way, the contact area of the first conductive connecting piece 31 and the second conductive connecting piece 32 with the corresponding grid line 2 is increased, which is conducive to the electrical connection of the first conductive connecting piece 31 and the second conductive connecting piece 32 with the grid line 2, and the connection is reliable. In addition, it can also reduce the impedance of the current transmission on the first conductive connecting piece 31 and the second conductive connecting piece 32, which is conducive to the electrical transmission between the battery pieces 1.

[0071] According to some embodiments of the present application, in combination with Figure 5The plurality of battery pieces 1 comprises a first battery piece 11, a second battery piece 12 and a third battery piece 13 arranged in sequence, the plurality of conductive connecting pieces 3 comprises a third conductive connecting piece 33 and a fourth conductive connecting piece 34, the plurality of second grid lines 22 of the first battery piece 11 and the plurality of first grid lines 21 of the second battery piece 12 are electrically connected through the third conductive connecting piece 33, and the plurality of second grid lines 22 of the second battery piece 12 and the plurality of first grid lines 21 of the third battery piece 13 are electrically connected through the fourth conductive connecting piece 34.

[0072] For example, in the example of the battery string 100, three battery pieces 1 are taken as an example, and the first battery piece 11, the second battery piece 12 and the third battery piece 13 are arranged in sequence from top to bottom, and the three battery pieces 1 are connected through a third conductive connecting piece 33 and a fourth conductive connecting piece 34. Figure 5 Taking the second battery piece 12 as an example, the upper ends of the plurality of first grid lines 21 on the second battery piece 12 are electrically connected to the lower ends of the plurality of second grid lines 22 of the first battery piece 11 through a third conductive connecting piece 33 in the upstream arrangement direction, and the lower ends of the plurality of second grid lines 22 on the second battery piece 12 are electrically connected to the upper ends of the plurality of first grid lines 21 of the third battery piece 13 through a fourth conductive connecting piece 34 in the downstream arrangement direction. That is to say, the upper end of the first grid line 21 of each battery piece 1 in the battery string 100 is connected to the lower end of the second grid line 22 of the previous battery piece 1, the lower end of the second grid line 22 of each battery piece 1 is connected to the upper end of the first grid line 21 of the next battery piece 1, the first battery piece 11 and the second battery piece 12 are electrically connected through the third conductive connecting piece 33, and the second battery piece 12 and the third battery piece 13 are electrically connected through the fourth conductive connecting piece 34. When the number of battery pieces 1 exceeds three, the series connection of the plurality of battery pieces 1 can be realized through the plurality of third conductive connecting pieces 33 and the plurality of fourth conductive connecting pieces 34, and the plurality of third conductive connecting pieces 33 and the plurality of fourth conductive connecting pieces 34 are arranged in sequence and alternately spaced to realize the electrical connection between the plurality of battery pieces 1. In addition, the third conductive connecting piece 33 and the fourth conductive connecting piece 34 are convenient to use, and the production efficiency of the battery string 100 is improved.

[0073] According to some embodiments of the present application, referring to Figure 5 and Figure 6 , one end of the first grid line 21 and the second grid line 22 in the arrangement direction of the battery piece 1 is a first end 221, the other end of the first grid line 21 and the second grid line 22 in the arrangement direction of the battery piece 1 is a second end 222, the first end 221 of the first grid line 21 is adjacent to one side edge of the battery piece 1 in the arrangement direction of the battery piece 1, and the second end 222 of the second grid line 22 is adjacent to the other side edge of the battery piece 1 in the arrangement direction of the battery piece 1.

[0074] In combination with Figure 5The two sides of the third conductive connecting piece 33 in the width direction respectively extend to the first battery piece 11 and the second battery piece 12 and are electrically connected with the corresponding second grid line 22 of the first battery piece 11 and the corresponding first grid line 21 of the second battery piece 12. The two sides of the fourth conductive connecting piece 34 in the width direction respectively extend to the second battery piece 12 and the third battery piece 13 and are electrically connected with the corresponding second grid line 22 of the second battery piece 12 and the corresponding first grid line 21 of the third battery piece 13. That is, the width of the third conductive connecting piece 33 is greater than the distance between the adjacent first battery piece 11 and the second battery piece 12, and the width of the fourth conductive connecting piece 34 is greater than the distance between the adjacent second battery piece 12 and the third battery piece 13.

[0075] For example, in the example of Figure 5 The upper side of the third conductive connecting piece 33 is electrically connected with the second end 222 of the plurality of second grid lines 22 of the first battery piece 11 respectively, and the lower side of the third conductive connecting piece 33 is electrically connected with the first end 221 of the plurality of first grid lines 21 of the second battery piece 12 respectively. The upper side of the fourth conductive connecting piece 34 is electrically connected with the second end 222 of the plurality of second grid lines 22 of the second battery piece 12 respectively, and the lower side of the fourth conductive connecting piece 34 is electrically connected with the first end 221 of the plurality of first grid lines 21 of the third battery piece 13 respectively. In this way, on the one hand, the third conductive connecting piece 33 and the fourth conductive connecting piece 34 are simple in structure, for example, can be rectangular, convenient to use, simplify the connection difficulty of the battery string 100, and improve the assembly efficiency. On the other hand, the effective electrical connection of the adjacent two battery pieces 1 is ensured, thereby facilitating the use of the battery string 100.

[0076] According to some embodiments of the present application, the third conductive connecting piece 33 and the fourth conductive connecting piece 34 are bus bars or conductive adhesive tapes. For example, the bus bar can be provided in a rectangular shape, and the upper side of the bus bar is connected with the plurality of second grid lines 22 of the corresponding battery piece 1, and the lower side of the bus bar is connected with the plurality of first grid lines 21 of the corresponding battery piece 1, which is convenient to use. When the third conductive connecting piece 33 and the fourth conductive connecting piece 34 are conductive adhesive tapes, the use cost of the third conductive connecting piece 33 and the fourth conductive connecting piece 34 is low, and the connection speed with the battery piece 1 is fast, thereby further improving the connection efficiency of the battery string 100. For example, as Figure 5 shown, a bus bar welding alloy can be used.

[0077] It should be noted that when the grid lines on the battery piece 1 are arranged as Figure 1As shown, that is, the two ends of the length direction of the plurality of first grid lines 21 and the plurality of second grid lines 22 are flush respectively, the adjacent two battery pieces 1 can be connected through the third conductive connecting piece 33 or the fourth conductive connecting piece 34, but the third conductive connecting piece 33 or the fourth conductive connecting piece 34 is electrically connected with the grid line 2 of the same polarity, and the other grid line of the opposite polarity needs to be insulated. That is, when one side of the third conductive connecting piece 33 is electrically connected with the plurality of first grid lines 21 on the battery piece 1, it is insulated and connected with the plurality of second grid lines 22, for example, the insulation can be realized by using insulating glue. When the grid lines on the battery piece are arranged as shown in Figure 6 As shown, that is, the first end 221 of the first grid line 21 extends beyond the first end 221 of the second grid line 22, and the second end 222 of the second grid line 22 extends beyond the second end 222 of the first grid line 21, which is conducive to the connection of the third conductive connecting piece 33 and the fourth conductive connecting piece 34 with the corresponding grid lines 2 on the adjacent battery piece 1, without the need for insulation treatment. That is, as shown, Figure 5 As shown, when the upper side of the third conductive connecting piece 33 is connected with the lower end of the plurality of second grid lines 22, the upper side of the third conductive connecting piece 33 is spaced apart from the lower end of the plurality of first grid lines 21 to be insulated.

[0078] According to some embodiments of the present application, the width of the third conductive connecting piece 33 along the arrangement direction of the battery piece 1 is w1, wherein w1 satisfies: 6mm≤w1≤20mm; and / or, the width of the fourth conductive connecting piece 34 along the arrangement direction of the battery piece 1 is w2, wherein w2 satisfies: 6mm≤w2≤20mm.

[0079] For example, in the example shown in Figure 5 The length of the third conductive connecting piece 33 along the arrangement direction of the plurality of battery pieces 1 is w1, and the length of the fourth conductive connecting piece 34 along the arrangement direction of the plurality of battery pieces 1 is w2. A part of the third conductive connecting piece 33 is located at the gap between the first battery piece 11 and the second battery piece 12, and a part of the third conductive connecting piece 33 overlaps the corresponding first battery piece 11 and second battery piece 12. A part of the fourth conductive connecting piece 34 is located at the gap between the second battery piece 12 and the third battery piece 13, and a part of the fourth conductive connecting piece 34 overlaps the corresponding second battery piece 12 and third battery piece 13. Thus, by limiting the length of the third conductive connecting piece 33 and the fourth conductive connecting piece 34 to meet the above requirements respectively, the size of the third conductive connecting piece 33 and the fourth conductive connecting piece 34 is reasonable, which ensures the electrical connection between the adjacent battery pieces 1, and the connection is reliable, and at the same time, the gap between the battery pieces 1 can be reduced, thereby being more conducive to the arrangement and connection of the battery string 100. In addition, the third conductive connecting piece 33 and the fourth conductive connecting piece 34 are convenient to use, which improves the connection speed of the battery piece 1 and the production efficiency of the battery string 100.

[0080] According to some embodiments of the present application, the width of the third conductive connecting piece 33 overlapping with the adjacent battery piece 1 is w3, wherein w3 satisfies: 3mm≤w3≤10mm; and / or, the width of the fourth conductive connecting piece 34 overlapping with the adjacent battery piece 1 is w4, wherein w4 satisfies: 3mm≤w4≤10mm. In this way, the size of the third conductive connecting piece 33 overlapping with the corresponding battery piece 1 is reasonably set, the size of the fourth conductive connecting piece 34 overlapping with the corresponding battery piece 1 is reasonably set, the contact area of the third conductive connecting piece 33 with the adjacent two battery pieces 1 is increased, and the contact area of the fourth conductive connecting piece 33 with the adjacent two battery pieces 1 is also increased, thereby facilitating the electrical connection of the third conductive connecting piece 33 and the fourth conductive connecting piece 34 with the grid lines 2 on the corresponding battery piece 1, improving the connection reliability. Moreover, the inter-piece gap between the adjacent two battery pieces 1 is small, which is conducive to the arrangement of the plurality of battery pieces 1.

[0081] According to some embodiments of the present application, at least a part of the conductive connecting piece 3 is located at the gap between the adjacent two battery pieces 1. For example, a part of the conductive connecting piece 3 is located at the gap between the adjacent two battery pieces 1, the two sides of the conductive connecting piece 3 overlap with the adjacent battery pieces 1 respectively, and contact with the corresponding grid lines 2. The above-mentioned contact can be that the end of the grid line 2 contacts with the end or side surface of the conductive connecting piece 3, or can refer to partial overlapping contact, so as to facilitate the electrical transmission of the adjacent battery pieces 1. In addition, the overall stability of the battery string 100 is also improved, which is conducive to the installation and use of the battery string 100.

[0082] According to the photovoltaic module (not shown in the figure) of the second aspect of the present application, the battery string 100 according to the above-mentioned first aspect embodiment is adopted.

[0083] According to the photovoltaic module of the present application, the production efficiency and use performance of the photovoltaic module are improved by adopting the above-mentioned battery string 100.

[0084] According to the photovoltaic power generation system (not shown in the figure) of the third aspect of the present application, the battery string 100 according to the above-mentioned first aspect embodiment, or the photovoltaic module according to the above-mentioned second aspect embodiment is adopted.

[0085] According to the photovoltaic power generation system of the present application, the production efficiency and use performance of the photovoltaic power generation system are improved by adopting the above-mentioned battery string 100 or photovoltaic module.

[0086] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and so on the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation configuration and operation, therefore can not be understood as the restriction of the utility model.

[0087] In the description of the utility model, "first feature", "second feature" can include one or more features.In the description of the utility model, "multiple" means two or more than two.In the description of the utility model, the first feature is "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them.In the description of the utility model, the first feature is "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature.

[0088] In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model.In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0089] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and its equivalents.

Claims

1. A battery string, characterized in that, include: Multiple solar cells are arranged sequentially. At least one side surface of each solar cell is provided with multiple grid lines. The multiple grid lines include multiple first grid lines and multiple second grid lines. The multiple first grid lines and multiple second grid lines extend along the arrangement direction of the multiple solar cells. The multiple first grid lines and multiple second grid lines are arranged alternately at intervals in a direction perpendicular to the arrangement direction of the multiple solar cells. The polarity of the second grid lines is opposite to that of the first grid lines. A conductive connector is used to electrically connect two adjacent battery cells.

2. The battery string according to claim 1, characterized in that, The plurality of solar cells include a first solar cell, a second solar cell, and a third solar cell arranged in sequence; The conductive connector is multiple, and the multiple conductive connectors include: Multiple first conductive connectors, wherein multiple second grid lines of the first battery cell and multiple first grid lines of the second battery cell are electrically connected through multiple first conductive connectors; Multiple second conductive connectors are provided, and multiple second grid lines of the second battery cell and multiple first grid lines of the third battery cell are electrically connected through multiple second conductive connectors.

3. The battery string according to claim 2, characterized in that, One end of the first grid line and the second grid line along the arrangement direction of the battery cell is designated as a first end, and the other end of the first grid line and the second grid line along the arrangement direction of the battery cell is designated as a second end. The first end of the first grid line is adjacent to one edge of the battery cell along the arrangement direction of the battery cell, and the second end of the second grid line is adjacent to the other edge of the battery cell along the arrangement direction of the battery cell. The two ends of the first conductive connector extend to the first battery cell and the second battery cell respectively and are electrically connected to the corresponding second grid line of the first battery cell and the corresponding first grid line of the second battery cell. The two ends of the second conductive connector extend to the second battery cell and the third battery cell respectively, and are electrically connected to the second grid line corresponding to the second battery cell and the first grid line corresponding to the third battery cell.

4. The battery string according to claim 3, characterized in that, The two ends of the first conductive connector are spaced apart from the second end of the first grid line of the first battery cell and the first end of the second grid line of the second battery cell along the arrangement direction of the plurality of battery cells, respectively. The two ends of the second conductive connector are spaced apart from the second end of the first grid line of the second battery cell and the first end of the second grid line of the third battery cell along the arrangement direction of the plurality of battery cells.

5. The battery string according to claim 3, characterized in that, The width of the first end of the first gate line is greater than or equal to the width of the rest of the first gate line excluding the first end, or the first end of the first gate line is provided with a Pad point. The width of the second end of the second gate line is greater than or equal to the width of the rest of the second gate line excluding the second end, or the second end of the second gate line is provided with a Pad point.

6. The battery string according to claim 3, characterized in that, The distance between the first end of the first grid line and one edge of the solar cell along the arrangement direction of the solar cell is d1, wherein d1 satisfies: 3mm ≤ d1 ≤ 10mm; and / or The distance between the second end of the second grid line and the other edge of the battery cell along the arrangement direction of the battery cell is d2, wherein d2 satisfies: 3mm≤d2≤10mm.

7. The battery string according to claim 2, characterized in that, The conductive connector is a solder strip or a conductive wire.

8. The battery string according to claim 2, characterized in that, The cross-sectional shape of the conductive connector is circular, elliptical, oblong, or polygonal.

9. The battery string according to claim 2, characterized in that, The length of the first conductive connector is L1, wherein L1 satisfies: 9mm ≤ L1 ≤ 20mm; and / or The length of the second conductive connector is L2, wherein L2 satisfies: 9mm≤L2≤20mm.

10. The battery string according to claim 2, characterized in that, The ratio of the width of the first conductive connector to the width of the gate line is 'a', where 'a' satisfies: 1 ≤ a ≤ 100; and / or The ratio of the width of the second conductive connector to the width of the gate line is b, where b satisfies: 1≤b≤100.

11. The battery string according to claim 1, characterized in that, The plurality of solar cells include a first solar cell, a second solar cell, and a third solar cell arranged in sequence; The conductive connector is multiple, and the multiple conductive connectors include: The third conductive connector is used to electrically connect the plurality of second grid lines of the first battery cell and the plurality of first grid lines of the second battery cell. A fourth conductive connector is provided, through which a plurality of second grid lines of the second battery cell and a plurality of first grid lines of the third battery cell are electrically connected.

12. The battery string according to claim 11, characterized in that, One end of the first grid line and the second grid line along the arrangement direction of the battery cell is designated as a first end, and the other end of the first grid line and the second grid line along the arrangement direction of the battery cell is designated as a second end. The first end of the first grid line is adjacent to one edge of the battery cell along the arrangement direction of the battery cell, and the second end of the second grid line is adjacent to the other edge of the battery cell along the arrangement direction of the battery cell. The third conductive connector extends to the first battery cell and the second battery cell on both sides in the width direction and is electrically connected to the corresponding second grid line of the first battery cell and the corresponding first grid line of the second battery cell. The fourth conductive connector extends to the second battery cell and the third battery cell on both sides in the width direction, and is electrically connected to the second grid line corresponding to the second battery cell and the first grid line corresponding to the third battery cell.

13. The battery string according to claim 11, characterized in that, The third conductive connector and the fourth conductive connector are respectively a busbar or a conductive tape.

14. The battery string according to claim 11, characterized in that, The width of the third conductive connector along the arrangement direction of the battery cells is w1, wherein w1 satisfies: 6mm ≤ w1 ≤ 20mm; and / or The width of the fourth conductive connector along the arrangement direction of the battery cells is w2, wherein w2 satisfies: 6mm≤w2≤20mm.

15. The battery string according to claim 11, characterized in that, The overlap width between the third conductive connector and the adjacent battery cell is w3, wherein w3 satisfies: 3mm ≤ w3 ≤ 10mm; and / or The width of the overlap between the fourth conductive connector and the adjacent battery cell is w4, wherein w4 satisfies: 3mm≤w4≤10mm.

16. The battery string according to any one of claims 1-15, characterized in that, At least a portion of the conductive connector is located in the gap between two adjacent battery cells.

17. A photovoltaic module, characterized in that, Includes the battery string according to any one of claims 1-16.

18. A photovoltaic power generation system, characterized in that, It includes the battery string according to any one of claims 1-16, or the photovoltaic module according to claim 17.

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