CN214505520U

CN214505520U - Photovoltaic module

Info

Publication number: CN214505520U
Application number: CN202120601745.9U
Authority: CN
Inventors: 吴艳芬; 贾行; 朱海飞; 陈辉; 董经兵
Original assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc; CSI Solar Technologies Inc
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-10-26
Anticipated expiration: 2031-03-24

Abstract

The utility model discloses a photovoltaic module, photovoltaic module includes: the battery pack comprises a plurality of battery strings, wherein the edge of a battery piece adjacent to a first piece is a first edge, and the edge opposite to the first edge is a second edge; a plurality of first interconnecting structural members, a distance D between one end of the first interconnecting structural members and the second edge₁The other end of the first interconnecting structural member is spaced from the first edge by a distance D₂(ii) a A second interconnecting structure, at least a portion of the second interconnecting structure being attached to the back side of the first sheet, an end of the second interconnecting structure adjacent the second edge being spaced from the second edge by a distance D₃(ii) a Third interconnect structureA member, at least a portion of the third interconnecting member being attached to the front face of the tail piece, an end of the third interconnecting member adjacent the first edge being spaced from the first edge by a distance D₄，D₃＞D₁And/or D₄＞D₂. According to the utility model discloses a photovoltaic module is favorable to realizing the reservation of the head end solder strip and/or the tail end solder strip of battery cluster, and can reduce the waste of solder strip.

Description

Photovoltaic module

Technical Field

The utility model belongs to the technical field of photovoltaic manufacturing technology and specifically relates to a photovoltaic module is related to.

Background

In the related art, solder strips with certain lengths are reserved at the head end and the tail end of a battery string of a photovoltaic module, so that the solder strips are connected with bus bars, and the battery strings are electrically connected. In order to reserve the welding strips at the head and the tail of the battery string, the tail piece of the former battery string and the head piece of the latter battery string are generally connected through two periodic welding strips, and then a string cutter is adopted to cut the tail piece of the former battery string at the string outlet position of each battery string. However, the above solution requires cutting the solder strip between the two series cutter cutting positions, which results in waste of the solder strip.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a photovoltaic module, photovoltaic module can reduce the waste of solder strip, effective reduce cost.

According to the utility model discloses photovoltaic module, include: the battery pack comprises a plurality of battery strings, each battery string comprises a plurality of battery sheets connected in series, two battery sheets positioned at two ends of each battery string are respectively a first sheet and a tail sheet, the edge of one side of each battery sheet adjacent to the first sheet is a first edge, and the edge of each battery sheet opposite to the first edge is a second edge; a plurality of first interconnection structures, one end of each first interconnection structure is connected to the back of the battery plate, and each first interconnection structureThe minimum distance between the one end of a member and the corresponding second edge is D₁The other end of each first interconnection structure is connected to the front surface of the adjacent battery piece, and the minimum distance between the other end of each first interconnection structure and the corresponding first edge is D₂(ii) a A second interconnecting structure, at least a portion of which is connected to the back side of the first sheet, the second interconnecting structure having a minimum distance D between an end adjacent to the second edge and the corresponding second edge₃(ii) a A third interconnecting structure, at least a portion of the third interconnecting structure being connected to the front face of the tail piece, a minimum distance D between an end of the third interconnecting structure adjacent the first edge and the corresponding first edge₄Wherein, the D is₁、D₂、D₃、D₄Satisfies the following conditions: d₃＞D₁And/or D₄＞D₂。

According to the utility model discloses photovoltaic module is through making at least a part of second interconnect structure connect the back at first piece to make at least a part of third interconnect structure connect the front at the tail piece, and the minimum distance D between the one end at the back of battery piece and the second edge that corresponds of connection of every first interconnect structure₁A minimum distance D between the other end of each first interconnection structure and the corresponding first edge₂A minimum distance D between one end of the second interconnecting structural member adjacent to the second edge and the corresponding second edge₃A minimum distance D between one end of the third interconnecting structure adjacent to the first edge and the corresponding first edge₄Satisfies D₃＞D₁And/or D₄＞D₂The second interconnection structural member and/or the third interconnection structural member can extend to the edge of one side of the corresponding battery piece far away from the center of the battery string, so that on one hand, the reservation of the head end welding strip and/or the tail end welding strip of the battery string is facilitated; on the other hand, the waste of the solder strip can be effectively reduced, so that the cost of the photovoltaic module can be reduced, and the production efficiency of the photovoltaic module can be effectively improved.

According to some embodiments of the invention, the D₁、D₂、D₃、D₄Further satisfies the following conditions: d₃＞D₁And D is₄＝D₂。

According to some embodiments of the invention, when D₃＞D₁When is in contact with D₁、D₃Further satisfies the following conditions: d is more than 0mm₃-D₁≤19mm。

According to some embodiments of the utility model, every the back of battery piece is equipped with a plurality of back main grid lines, first interconnect structure one end with second interconnect structure respectively with correspond on the battery piece back main grid line electricity is connected, back main grid line includes the edge a plurality of back electrodes that the extending direction interval of battery cluster was arranged, the distance of first piece the second edge is nearest back electrode with correspond minimum distance between the second edge is D₅Wherein, the D is₅、D₃Satisfies the following conditions: d is less than or equal to-4 mm₅-D₃≤2mm。

According to some embodiments of the invention, the distance between the first edge and the second edge of the battery piece is D, and the distance between the first edge and the second edge is D₆Said D is₅、D₆Further satisfies the following conditions: d₅＞D₆。

According to some embodiments of the invention, the distance between the first edge and the second edge of the battery piece is D, and the distance between the first edge and the second edge is D₆Wherein, the D is₁、D₆Satisfies the following conditions: d is less than or equal to-1 mm₆-D₁≤15mm。

According to some embodiments of the invention, when D₄＞D₂When is in contact with D₂、D₄Further satisfies the following conditions: d is more than 0mm₄-D₂＜10mm。

According to some embodiments of the present invention, the first interconnection structures have the same resistance value,each of the first interconnection structures has a resistance value of R₁The resistance value of the second interconnection structure is R₂The resistance value of the third interconnection structure is R₃Wherein, said R₁、R₂、R₃Satisfies the following conditions: r₂＞R₁And/or R₃＞R₁。

According to some embodiments of the invention, R is₁、R₂、R₃Further satisfies the following conditions: 5 percent to less (R)₂-R₁)/R₁Less than or equal to 20 percent and/or less than or equal to 5 percent (R)₃-R₁)/R₁≤20％。

According to some embodiments of the invention, R is₂、R₃Respectively satisfy: 185m omega/m is less than or equal to R₂≤265mΩ/m，185mΩ/m≤R₃≤265mΩ/m。

According to some embodiments of the invention, R is₁Satisfies the following conditions: r is more than or equal to 180m omega/m₁≤220mΩ/m。

According to some embodiments of the invention, the first interconnecting member has a stretch ratio of λ₁A stretch ratio of said second interconnecting structural member is λ₂A stretch ratio of said third interconnecting structural member is λ₃Wherein, said λ₁、λ₂、λ₃Satisfies the following conditions: lambda [ alpha ]₂＞λ₁And/or λ₃＞λ₁。

According to some embodiments of the invention, the λ₁、λ₂、λ₃Further satisfies the following conditions: lambda is more than or equal to 4%₂-λ₁Not more than 15.3 percent and/or not more than 4 percent lambda₃-λ₁≤15.3％。

According to some embodiments of the invention, the λ₂、λ₃Respectively satisfy: lambda is more than or equal to 6%₂≤15.8％，6％≤λ₃≤15.8％。

According to some embodiments of the invention, the λ₁Satisfies the following conditions: lambda is more than or equal to 0.5%₁≤2％。

According to some embodiments of the invention, the width of the third interconnecting structural memberDegree W₁The height of the third interconnecting structural member is H₁Wherein, the W₁、H₁Respectively satisfy: w is not less than 0.32mm₁≤0.38mm，0.3mm≤H₁Less than or equal to 0.34 mm; the other end of the first interconnecting structure has a width W₂Said other end of said first interconnecting structural member has a height H₂Wherein, the W₂、H₂Respectively satisfy: w is not less than 0.35mm₂≤0.4mm，0.32mm≤H₂≤0.37mm。

According to some embodiments of the invention, the width of the second interconnecting structural member is W₃The height of the second interconnection structure is H₃Wherein, the W₃、H₃Respectively satisfy: w is not less than 0.55mm₃≤1.1mm，0.08mm≤H₃Less than or equal to 0.23 mm; the one end of the first interconnecting structural member has a width W₄Said one end of said first interconnecting structural member has a height H₄Wherein, the W₄、H₄Respectively satisfy: w is not less than 0.6mm₄≤1.2mm，0.1mm≤H₄≤0.25mm。

According to some embodiments of the present invention, each first interconnection structure includes first linkage segment and second linkage segment that link to each other, the shape of first linkage segment is the platykurtic, at least a part of first linkage segment is connected the back of battery piece, the shape of second linkage segment is non-flat, the second linkage segment is connected adjacently the front of battery piece, the shape of second interconnection structure is the platykurtic, the shape of third interconnection structure is non-flat.

According to some embodiments of the invention, the photovoltaic module comprises: the battery pack comprises two battery units which are connected in parallel and are arranged along the arrangement direction of battery pieces in a string, each battery unit comprises two battery strings which are connected in series and are arranged along the string arrangement direction which is vertical to the arrangement direction of the battery pieces in the string, and the two battery strings are a first battery string and a second battery string respectively; a plurality of end bus bars, the end bus bars being respectively located at two ends of the cell stack along the arrangement direction of the cells in the string, each end bus bar extending along the string arrangement direction, the first cell of the first cell string being electrically connected to the corresponding end bus bar through the second interconnection structure, and the last cell of the second cell string being electrically connected to the corresponding end bus bar through the third interconnection structure; the middle bus bar is located on the same two battery units of the battery unit group, the middle bus bar extends along the string arrangement direction, the tail piece of the first battery string passes through the third interconnection structural member and is electrically connected with the middle bus bar, and the head piece of the second battery string passes through the second interconnection structural member and is electrically connected with the middle bus bar.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a battery string according to an embodiment of the present invention;

fig. 2 is a schematic diagram of the connection of a battery cell to a first interconnect structure, a second interconnect structure, and a third interconnect structure according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention;

fig. 4 is another schematic structural view of a photovoltaic module according to an embodiment of the present invention;

FIG. 5 is an enlarged view of portion A circled in FIG. 4;

FIG. 6 is an enlarged view of the portion B circled in FIG. 4;

fig. 7 is an enlarged view of a portion C circled in fig. 4.

Reference numerals:

100: a battery string;

1: a battery piece; 11: first sheet; 12: a tail piece; 13: an intermediate sheet;

2: a first interconnecting structural member; 21: a first connection section; 22: a second connection section;

3: a second interconnecting structural member; 4: a third interconnecting structural member;

200: a photovoltaic module;

201: a first battery string; 202: a second battery string;

203: an end bus bar; 204: an intermediate bus bar.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

A photovoltaic module 200 according to an embodiment of the present invention is described below with reference to fig. 1-7.

As shown in fig. 1, 3 and 4, a photovoltaic module 200 according to an embodiment of the present invention includes a plurality of cell strings 100, a plurality of first interconnecting structural members 2, a second interconnecting structural member 3 and a third interconnecting structural member 4. In the description of the present invention, "a plurality" means two or more. The first interconnecting structural member 2, the second interconnecting structural member 3 and the third interconnecting structural member 4 may be metal conductive wires commonly used in the photovoltaic field, and the material may be copper wires, or tinned copper wires, or conductive wires with a surface plated with a low-temperature alloy, such as low-temperature solder strips or bus bars plated with metals such as nickel and lead.

Each battery string 100 includes a plurality of battery pieces 1 connected in series, and two battery pieces 1 at two ends of the battery string 100 in each battery string 100 are a first piece 11 and a tail piece 12, respectively, for example, one end of the battery string 100 is the first piece 11, and the other end is the tail piece 12. The edge of each cell piece 1 adjacent to the side where the first piece 11 is located is a first edge, and the edge of each cell piece 1 opposite to the first edge is a second edge. The first edge of the first sheet 11 refers to one side edge of the first sheet 11 away from the center of the battery string 100. Optionally, at least one intermediate sheet 13 may be provided between the leading sheet 11 and the trailing sheet 12.

One end of each first interconnection structure member 2 is connected to the back surface of the battery plate 1, and the minimum distance between the end of each first interconnection structure member 2 and the corresponding second edge is D₁The other end of each first interconnection structure 2 is connected to the front surface of the adjacent cell 1, and the minimum distance between the other end of each first interconnection structure 2 and the corresponding first edge is D₂. That is, the distance between the start welding point of each first interconnection structure 2 and the first edge of the corresponding battery cell 1 is D₂The distance between the ending point of each first interconnection structure member 2 and the second edge of the corresponding battery plate 1 is D₁. The front surface refers to a main light receiving surface of the cell sheet 1, that is, a surface of the cell sheet 1 or the photovoltaic module 200 directly receiving sunlight, and the back surface is a surface opposite to the front surface.

At least a portion of the second interconnecting structural member 3 is attached to the back of the first sheet 11, that is, the second interconnecting structural member 3 may be attached entirely to the back of the first sheet 11, or one portion may be attached to the back of the first sheet 11 and the other portion may extend beyond the first edge of the first sheet 11. The minimum distance between one end of the second interconnecting structural member 3 adjacent to the second edge and the corresponding second edge is D₃. At least a portion of the third interconnecting member 4 is attached to the front surface of the tail piece 12, i.e., the third interconnecting member 4 may be attached entirely to the front surface of the tail piece 12, or may be attached to the front surface of the tail piece 12 in one portion and extend beyond the second edge of the tail piece 12 in another portion. The minimum distance between one end of the third interconnecting structural member 4 adjacent to the first edge and the corresponding first edge is D₄。

Wherein D is₁、D₂、D₃、D₄Satisfies the following conditions: d₃＞D₁And/or D₄＞D₂. That is, D may be₃＞D₁，D₄≤D₂(ii) a Or, D₄＞D₂，D₃≤D₁(ii) a Of course, D may also be₃＞D₁And D₄＞D₂。

Thereby, by making D₃＞D₁And/or D₄＞D₂When D is present₃＞D₁During the manufacturing process, the distance between one end of the second interconnection structure 3 adjacent to the second edge and the second edge of the first sheet 11 is large, so that the whole second interconnection structure 3 can integrally move towards the direction far away from the second edge, and the end of the second interconnection structure 3 far away from the second edge can extend to exceed the first edge of the first sheet 11, thereby realizing the reservation of the welding strip at the head end of the battery string 100, avoiding the overlarge stretching ratio of the second interconnection structure 3 and reducing the risk of the manufacturing process; when D is present₄＞D₂During the process, the distance between one end of the third interconnecting structural member 4 adjacent to the first edge and the first edge of the tail piece 12 is large, so that the whole third interconnecting structural member 4 can move towards the direction away from the first edge integrally, and the end of the third interconnecting structural member 4 away from the first edge can extend to the second edge beyond the tail piece 12, thereby realizing the reservation of the tail end welding strip of the battery string 100, avoiding the overlarge stretching ratio of the third interconnecting structural member 4, and effectively reducing the risk of the manufacturing process. In addition, compared with the existing mode that the tail piece of the previous battery string is connected with the head piece of the next battery string through two periodic welding strips, the welding strip between the cutting positions of the two string cutters does not need to be cut, so that the waste of the welding strip can be reduced, the cost of the photovoltaic module 200 is reduced, the welding machine can continuously weld, and the productivity of the welding machine can be effectively improved.

According to the utility model discloses photovoltaic module 200 is through making at least a part of second interconnected structure 3 connect the back at first piece 11 to make at least a part of third interconnected structure 4 connect the front at tail piece 12, and the connection of every first interconnected structure 2 is at the minimum distance D between the one end at the back of battery piece 1 and the second edge that corresponds₁A minimum distance D between the other end of each first interconnecting structure 2 and the corresponding first edge₂A minimum distance D between an end of the second interconnecting structural member 3 adjacent the second edge and the corresponding second edge₃A minimum distance D between an end of the third interconnecting structural member 4 adjacent the first edge and the corresponding first edge₄Satisfies D₃＞D₁And/or D₄＞D₂The second interconnecting structural member 3 and/or the third interconnecting structural member 4 may extend to exceed an edge of one side of the corresponding battery sheet 1 far from the center of the battery string 100, which is beneficial to realizing the reservation of the head end welding strip and/or the tail end welding strip of the battery string 100; on the other hand, the waste of the solder strip can be effectively reduced, so that the cost of the photovoltaic module 200 can be reduced, and the production efficiency of the photovoltaic module 200 can be effectively improved.

In some embodiments of the invention, D₁、D₂、D₃、D₄Further satisfies the following conditions: d₃＞D₁And D is₄＝D₂. With such an arrangement, on one hand, it is ensured that one end of the second interconnection structural member 3, which is far away from the second edge, can extend to exceed the first edge of the first sheet 11, so as to realize the reservation of the welding strip at the head end of the battery string 100; on the other hand, the minimum distances between the third interconnecting structural member 4 and the plurality of first interconnecting structural members 2 connected to the front surface of the cell 1 and the corresponding first edges may be equal, so that the third interconnecting structural member 4 may be in full contact with the tail sheet 12, and the current generated by the tail sheet 12 through the photovoltaic effect may be effectively conducted to the third interconnecting structural member 4, thereby avoiding the edge of the tail sheet 12 from being blackened, and enabling the front surface of the whole photovoltaic module 200 to be more neat and beautiful, and improving the appearance beauty of the photovoltaic module 200.

In some embodiments of the present invention, when D₃＞D₁When D is₁、D₃Further satisfies the following conditions: d is more than 0mm₃-D₁Less than or equal to 19 mm. Specifically, for example, when D₃-D₁When the width of the second interconnection structure member is greater than 19mm, the minimum distance between one end of the second interconnection structure member 3 adjacent to the second edge and the corresponding second edge is too large, so that the contact area between the second interconnection structure member 3 and the back surface of the first sheet 11 is too small, the welding tension between the second interconnection structure member 3 and the first sheet 11 is reduced, the current of the first sheet 11 may not be effectively led out, and the output power of the photovoltaic module 200 is affected. Thereby, by making D₁、D₃Satisfies the condition that D is more than 0mm₃-D₁19mm or less, such that between one end of the second interconnecting structural member 3 adjacent the second edge and the corresponding second edgeThe minimum distance can be reasonable, the welding firmness between the second interconnection structural member 3 and the first sheet 11 is guaranteed, the current is effectively led out, and the long-term reliability of the photovoltaic module 200 can be improved.

In some embodiments of the present invention, the back of each cell 1 is provided with a plurality of back main grid lines, the above-mentioned one end of the first interconnection structure 2 and the second interconnection structure 3 are respectively electrically connected to the back main grid line on the corresponding cell 1, the back main grid line includes a plurality of back electrodes arranged at intervals along the extending direction of the cell string 100, the minimum distance between the nearest back electrode at the second edge of the first cell 11 and the corresponding second edge is D₅Wherein D is₅、D₃Satisfies the following conditions: d is less than or equal to-4 mm₅-D₃≤2mm。

For example, when D₅-D₃When the thickness is less than-4 mm, the length of the second interconnection structural member 3 retracted into the back electrode is too large, so that the contact area between the second interconnection structural member 3 and the corresponding back main grid line is too small, the welding firmness between the second interconnection structural member 3 and the first sheet 11 is influenced, and the current derivation is influenced; when D is present₅-D₃When the length of the second interconnecting structural member 3 extending beyond the back electrode is too large, the length of the first interconnecting structural member 2 extending beyond the second edge is too small, and the length of the first interconnecting structural member 2 extending beyond the first sheet 11 is too small, so that the reserved length of the welding strip at the head end of the battery string 100 can be reduced, and the welding of the second interconnecting structural member 3 and the bus bar is affected. Thereby, by making D₅、D₃Satisfies the following conditions: d is less than or equal to-4 mm₅-D₃2mm or less, the length of the second interconnection structural member 3 extending to the position beyond the first edge is ensured to be large enough while the welding firmness between the second interconnection structural member 3 and the first sheet 11 is effectively improved and the effective output of current is ensured, so that the reservation of the welding strip at the head end of the battery string 100 is effectively realized.

In some optional embodiments of the present invention, the minimum distance between the back electrode closest to the second edge and the corresponding second edge of the other battery pieces 1 except the first piece 11 is D₆，D₅、D₆Satisfies the following conditions: d₅＞D₆. Thereby, by making D₅＞D₆Phase of changeCompared with the rest of the battery sheets 1, the minimum distance between the back electrode of the first sheet 11 closest to the second edge and the corresponding second edge is larger, when the second interconnection structural member 3 is welded, the minimum distance between one end of the second interconnection structural member 3 adjacent to the second edge and the corresponding second edge is larger, the reserved welding strip at the head end of the battery string 100 is ensured, the stretching length of the second interconnection structural member 3 can be effectively reduced, the structural strength of the second interconnection structural member 3 is improved, and the process risk is reduced.

In some optional embodiments of the present invention, D₁、D₆Satisfies the following conditions: d is less than or equal to-1 mm₆-D₁Less than or equal to 15 mm. For example, when D₆-D₁When the thickness is less than-1 mm, the length of the one end of the first interconnection structural member 2 retracted into the back electrode is too large, so that the contact area between the first interconnection structural member 2 and the corresponding back main grid line is too small, the welding firmness between the first interconnection structural member 2 and the corresponding battery piece 1 is influenced, and the current derivation is influenced; when D is present₆-D₁At > 15mm, the length of the upper end of the first interconnect structure 2 extending beyond the back electrode is too large, resulting in an excessively long tensile length of the first interconnect structure 2, which may affect the structural strength of the first interconnect structure 2.

Whereby by making-1 mm. ltoreq.D₆-D₁The thickness is less than or equal to 15mm, on one hand, the welding tension of the first interconnection structural member 2 and the back of the corresponding battery piece 1 can be improved, and the current can be effectively led out; on the other hand, the tensile length of the first interconnection structure 2 may be reduced, thereby improving the structural strength of the first interconnection structure 2 and reducing the process risk. In addition, the distance between the end of the first interconnecting structural member 2 and the corresponding second edge can be further ensured to be smaller than the distance between the end of the second interconnecting structural member 3 adjacent to the second edge and the corresponding second edge, so that the reservation of the head end welding strip is realized. In addition, when the first interconnecting structural member 2 is a special-shaped welding strip and the second interconnecting structural member 3 and the third interconnecting structural member 4 are cut from the same special-shaped welding strip, D is larger than or equal to-1 mm₆-D₁Less than or equal to 15mm, the cycle length of the special-shaped welding strip can be increased, thereby realizing the pre-welding of the head and tail welding strips of the battery string 100While remaining, the stretch ratio of the second and

third interconnection structures

3 and 4 may be reduced, reducing the process risk.

In some embodiments of the present invention, when D₄＞D₂When D is₂、D₄Further satisfies the following conditions: d is more than 0mm₄-D₂Less than 10 mm. Thus, since the distance between one end of the front face busbar adjacent to the first edge and the corresponding first edge is generally 10mm or less, by making 0mm < D₄-D₂Less than 10mm, the third interconnecting structural member 4 can completely cover the corresponding front main grid line in the extending direction of the battery string 100 while the reservation of the tail end welding strip of the battery string 100 is realized, so that the current generated by the tail piece 12 through the photovoltaic effect can be effectively conducted to the third interconnecting structural member 4 through the front main grid line, and the current is favorably led out.

In some embodiments of the present invention, the resistance values of the plurality of first interconnection structures 2 are the same, and the resistance value of each first interconnection structure 2 is R₁The resistance value of the second interconnection structure 3 is R₂The third interconnection structure 4 has a resistance value R₃Wherein R is₁、R₂、R₃Satisfies the following conditions: r₂＞R₁And/or R₃＞R₁. The "resistance value" may be a resistance value per meter, and refers to a resistance value of one meter length of the conductor (i.e., the first interconnection structural member 2, the second interconnection structural member 3, and the third interconnection structural member 4) at a reference temperature. The resistance per meter is the ratio of the electrical resistivity of the conductor to the cross-sectional area, and since the electrical resistivity is only related to the material of the conductor at the same temperature, the electrical resistivity is constant, and the resistance per meter is inversely proportional to the cross-sectional area of the conductor.

Thereby, by making R₂＞R₁And/or R₃＞R₁When R is₂＞R₁In this case, the cross-sectional area of the second interconnecting structural member 3 may be smaller than the cross-sectional area of the above-mentioned one end of the first interconnecting structural member 2, so that the stretch ratio of the second interconnecting structural member 3 may be larger than that of the first interconnecting structural member 2, the length of the second interconnecting structural member 3 may be increased, and it is advantageous to realize a batteryReservation of the leading end of the string 100, when R₃＞R₁In the meantime, the cross-sectional area of the third interconnecting structural member 4 may be smaller than the cross-sectional area of the above-mentioned other end of the first interconnecting structural member 2, so that the stretch ratio of the third interconnecting structural member 4 may be larger than that of the first interconnecting structural member 2, the length of the third interconnecting structural member 4 may be increased, and the reservation of the tail end solder strip of the battery string 100 is facilitated. In addition, the resistance values of the plurality of first interconnection structural members 2 are all the same, and the currents flowing through the plurality of first interconnection structural members 2 when the voltages are the same are all the same, so that the plurality of first interconnection structural members 2 can effectively lead out the currents generated by the plurality of battery pieces 1 through the photovoltaic effect, and the photovoltaic module 200 is ensured to have higher output power.

In some embodiments of the invention, R₁、R₂、R₃Further satisfies the following conditions: 5 percent to less (R)₂-R₁)/R₁Less than or equal to 20 percent and/or less than or equal to 5 percent (R)₃-R₁)/R₁Less than or equal to 20 percent. Specifically, when R is₂＞R₁When R is₁、R₂Can satisfy the following conditions: 5 percent to less (R)₂-R₁)/R₁Less than or equal to 20 percent. When R is₃＞R₁When R is₁、R₃Can satisfy the following conditions: 5 percent to less (R)₃-R₁)/R₁≤20％。

For example, when R is₂＞R₁When is (R) is not present₂-R₁)/R₁If the resistance value of the second interconnecting structural member 3 is too small compared with the resistance value of the first interconnecting structural member 2, the length of the second interconnecting structural member 3 may be too small, which may cause that one end of the second interconnecting structural member 3 far away from the second edge cannot extend to exceed the first edge of the first sheet 11, and the reservation of the welding strip at the head end of the battery string 100 cannot be realized; if (R)₂-R₁)/R₁And more than 20 percent, the increase rate of the resistance value of the second interconnection structure member 3 relative to the first interconnection structure member 2 is too large, which may cause the poor conductivity of the second interconnection structure member 3 and affect the output power of the photovoltaic module 200.

Similarly, when R is₃＞R₁When is (R) is not present₃-R₁)/R₁< 5%, the rate of increase of the resistance of the third interconnecting structural member 4 relative to the first interconnecting structural member 2 is too small, which may result in too small a length of the third interconnecting structural member 4, and the end of the third interconnecting structural member 4 away from the first edge may not extend beyond the second edge of the tail tab 12, thereby failing to achieve the reservation of the tail end solder strip of the battery string 100; when (R)₃-R₁)/R₁If the resistance value of the third interconnecting structural member 4 is increased more than 20%, the conductivity of the third interconnecting structural member 4 may be too poor, and the output power of the photovoltaic module 200 may be affected.

Thus, by making 5% ≦ (R)₂-R₁)/R₁Less than or equal to 20 percent and/or less than or equal to 5 percent (R)₃-R₁)/R₁Less than or equal to 20 percent, on one hand, the reservation of the head end welding strip and/or the tail end welding strip of the battery string 100 is facilitated; on the other hand, the second interconnection structure 3 and the third interconnection structure 4 are ensured to have stronger electric conductivity and higher structural strength, so that the output power and reliability of the photovoltaic module 200 can be improved.

In some embodiments of the invention, R₂、R₃Respectively satisfy: 185m omega/m is less than or equal to R₂≤265mΩ/m，185mΩ/m≤R₃Is less than or equal to 265m omega/m. For example, when R is₂When the resistance value of the second interconnection structural member 3 is too small less than 185m omega/m, the stretching ratio of the second interconnection structural member 3 is too small, the length is too small, and the reservation of the welding strip at the head end of the battery string 100 cannot be effectively realized; when R is₂At > 265m Ω/m, the resistance of the second interconnecting structural member 3 is too high, which may result in too poor a conductive ability and too low a structural strength of the second interconnecting structural member 3. Similarly, when R is₃If the length of the third interconnecting structural member 4 is less than 185m Ω/m, the length of the welding strip at the tail end of the battery string 100 cannot be reserved; when R is₃> 265m Ω/m may result in an excessive length of the third interconnecting structural member 4, which may result in an excessively poor electrical conductivity of the third interconnecting structural member 4 and a low structural strength. Thereby, by making R₂、R₃Respectively satisfy: 185m omega/m is less than or equal to R₂≤265mΩ/m，185mΩ/m≤R₃Less than or equal to 265m omega/m, on the one handThe reservation of the head end welding strip and the tail end welding strip of the battery string 100 can be effectively realized; on the other hand, the second interconnection structure 3 and the third interconnection structure 4 are ensured to have stronger conductive ability and higher structural strength, so that the power generation efficiency and the long-term reliability of the photovoltaic module 200 can be improved.

In some optional embodiments of the present invention, R₁Can satisfy the following conditions: r is more than or equal to 180m omega/m₁Less than or equal to 220m omega/m. So set up, the resistance value of first interconnection structure 2 is comparatively reasonable, guarantees that first interconnection structure 2 has under the prerequisite of stronger conducting power and structural strength, makes first interconnection structure 2 can fully contact with the battery piece 1 that corresponds to can effectively derive the electric current that battery piece 1 produced through the photovoltaic effect, avoid battery piece 1 edge to blacken.

In some embodiments of the present invention, the first interconnecting structural member 2 has a stretch ratio λ₁The second interconnecting structural member 3 has a stretch ratio λ₂The third interconnecting structural member 4 has a stretch ratio λ₃Wherein λ is₁、λ₂、λ₃Satisfies the following conditions: lambda [ alpha ]₂＞λ₁And/or λ₃＞λ₁. It should be noted that "stretch ratio" is understood to mean the ratio of the stretched length of the object to the length before stretching, for example, let the length of the first interconnecting structural member 2 before stretching be L₁The first interconnecting structural member 2 has a length L after being stretched₂Then λ₁＝(L₂-L₁)/L₁。

Thus, when λ is₂＞λ₁During the process, the stretching ratio of the second interconnecting structural member 3 is large, one end, far away from the second edge, of the stretched second interconnecting structural member 3 can extend to exceed the first edge of the first sheet 11, the total weight of the second interconnecting structural member 3 can be unchanged while the reservation of the welding strip at the head end of the battery string 100 is realized, and compared with the existing photovoltaic module 200, the welding strip using amount of the photovoltaic module 200 can be reduced; when lambda is₃＞λ₁The third interconnecting member 4 may be stretched more than necessary, and the end of the stretched third interconnecting member 4 remote from the first edge may extend beyond the second edge of the tail piece 12While the reservation of the tail end solder strip of the cell string 100 is realized, the total weight of the third interconnecting structural member 4 may not be changed, and the amount of the solder strip of the photovoltaic module 200 may also be reduced.

In some optional embodiments of the present invention, λ₁、λ₂、λ₃Further satisfies the following conditions: lambda is more than or equal to 4%₂-λ₁Not more than 15.3 percent and/or not more than 4 percent lambda₃-λ₁Less than or equal to 15.3 percent. In particular, when λ₂＞λ₁When is lambda₁、λ₂Can satisfy the following conditions: lambda is more than or equal to 4%₂-λ₁Less than or equal to 15.3 percent; when lambda is₃＞λ₁When is lambda₁、λ₃Can satisfy the following conditions: lambda is more than or equal to 4%₃-λ₁≤15.3％。

For example, when λ₂＞λ₁When, if λ₂-λ₁If the difference between the stretch ratio of the second interconnecting structural member 3 and the stretch ratio of the first interconnecting structural member 2 is too small, the length of the second interconnecting structural member 3 is too small, and the end of the second interconnecting structural member 3 far from the second edge may not extend to exceed the first edge of the first sheet 11, so that the reservation of the welding strip at the head end of the battery string 100 cannot be realized; if λ₂-λ₁Greater than 15.3%, the difference between the stretch ratio of the second interconnect structure 3 and the stretch ratio of the first interconnect structure 2 may result in the length of the second interconnect structure 3 being too large, which may result in the second interconnect structure 3 having too poor electrical conductivity, too low structural strength, and process risk. Similarly, when λ₃＞λ₁When, if λ₃-λ₁If the ratio is less than 4%, the difference between the stretch ratio of the third interconnecting structural member 4 and the stretch ratio of the first interconnecting structural member 2 is too small, and the reservation of the tail end welding strip of the battery string 100 may not be realized; if λ₃-λ₁With > 15.3%, an excessively large difference in the stretch ratio of the third interconnecting structural member 4 and the stretch ratio of the first interconnecting structural member 2 may result in an excessively poor electrical conductivity and an excessively low structural strength of the second interconnecting structural member 3.

Thus, by making 4% lambda less than or equal to₂-λ₁Lambda is less than or equal to 15.3 percent and/or less than or equal to 4 percent₃-λ₁Less than or equal to 15.3 percent, and is used for realizing the head of the battery string 100While the end solder strips and/or the tail solder strips are reserved, the second interconnection structural member 3 and the third interconnection structural member 4 are ensured to have stronger conductive capacity and higher structural strength, so that the output power and the reliability of the photovoltaic module 200 can be improved.

In some optional embodiments of the present invention, λ₂、λ₃Respectively satisfy: lambda is more than or equal to 6%₂≤15.8％，6％≤λ₃Less than or equal to 15.8 percent. For example, when λ₂If the tensile ratio of the second interconnecting structural member 3 is too small less than 6%, the length of the second interconnecting structural member 3 is too small, and the reservation of the welding strip at the head end of the battery string 100 may not be realized; when lambda is₂At > 15.8%, the draw ratio of the second interconnecting structural member 3 is too large, resulting in too poor electrical conductivity and too low structural strength of the second interconnecting structural member 3. Similarly, when λ₃When the welding current is less than 6%, the reservation of the welding strip at the tail end of the battery string 100 may not be realized; when lambda is₃Above 15.8%, the third interconnect structure 4 may have too poor electrical conductivity and too low structural strength. Therefore, through the arrangement, the reservation of the head end welding strip and the tail end welding strip of the battery string 100 can be effectively realized, the conductive capacity and the structural strength of the second interconnection structural member 3 and the third interconnection structural member 4 can be improved, and the effective derivation of current is realized.

In some optional embodiments of the present invention, λ₁Can satisfy the following conditions: lambda is more than or equal to 0.5%₁Less than or equal to 2 percent. In this way, the stretching ratio of the first interconnection structure member 2 is reasonable, so that the first interconnection structure member 2 has higher conductivity and higher structural strength, and the length of the first interconnection structure member 2 can be matched with the lengths of two adjacent battery pieces 1, thereby effectively guiding out the current generated by the battery pieces 1, and further improving the reliability of the photovoltaic module 200.

In some optional embodiments of the present invention, the third interconnecting structural member 4 has a width W₁The third interconnecting structural member 4 has a height H₁Wherein W is₁、H₁Respectively satisfy: w is not less than 0.32mm₁≤0.38mm，0.3mm≤H₁Less than or equal to 0.34 mm. The width of the aforementioned other end of the first interconnecting structural part 2 is W₂First interconnection junctionThe height of the other end of the member 2 is H₂Wherein W is₂、H₂Respectively satisfy: w is not less than 0.35mm₂≤0.4mm，0.32mm≤H₂Less than or equal to 0.37 mm. E.g. H₂May be 0.35 mm. Thereby, by making W₁、H₁Respectively satisfy: w is not less than 0.32mm₁≤0.38mm，0.3mm≤H₁The width of the third interconnecting structural member 4 is more reasonable, so that the third interconnecting structural member 4 can be fully contacted with the front main grid line on the tail piece 12, the welding tension between the third interconnecting structural member 4 and the tail piece 12 is improved, the shielding of the tail piece 12 can be reduced, and the light receiving area of the tail piece 12 is improved; on the other hand, the third interconnecting structural member 4 has reasonable height, can effectively reflect sunlight, improves the utilization rate of light rays, and can prevent the cell 1 from cracking.

By making W₂、H₂Respectively satisfy: w is not less than 0.35mm₂≤0.4mm，0.32mm≤H₂On one hand, the width of the other end of the first interconnection structure member 2 is reasonable, so that the other end of the first interconnection structure member 2 can be fully contacted with the front main grid lines on the corresponding first sheet 11 and the corresponding middle sheet 13, a high welding tension is ensured between the other end of the first interconnection structure member 2 and the corresponding cell sheet 1, and the current generated by the cell sheet 1 can be effectively transmitted to the other end of the first interconnection structure member 2 through the front main grid lines, so that the current is led out, the shielding area of the other end of the first interconnection structure member 2 to the corresponding cell sheet 1 is small, and the output power of the photovoltaic module 200 can be improved; on the other hand, the height of the other end of the first interconnecting structural member 2 is reasonable, so that the other end of the first interconnecting structural member 2 can effectively reflect sunlight, the photoelectric conversion efficiency of the photovoltaic module 200 is improved, and the risk of splitting of the cell 1 can be reduced. Additionally, the width of the third interconnecting member 4 may be less than the width of the other end of the first interconnecting member 2, and the height of the third interconnecting member 4 may be less than the height of the other end of the first interconnecting member 2, such that the cross-sectional area of the third interconnecting member 4 may be less than the cross-sectional area of the other end of the first interconnecting member 2, the third interconnecting member 4The stretch ratio of the three interconnecting structural members 4 may be greater than the stretch ratio of the first interconnecting structural member 2, so that the length of the third interconnecting structural members 4 may be increased, and the reservation of the solder strip at the tail end of the battery string 100 may be realized.

In some optional embodiments of the present invention, the width of the second interconnecting structural member 3 is W₃The second interconnection structure 3 has a height H₃Wherein W is₃、H₃Respectively satisfy: w is not less than 0.55mm₃≤1.1mm，0.08mm≤H₃Less than or equal to 0.23 mm. The width of the aforementioned one end of the first interconnecting structural member 2 is W₄The height of the above-mentioned end of the first interconnecting structural member 2 is H₄Wherein W is₄、H₄Respectively satisfy: w is not less than 0.6mm₄≤1.2mm，0.1mm≤H₄≤0.25mm。

Thereby, by making W₃、H₃Respectively satisfy: w is not less than 0.55mm₃≤1.1mm，0.08mm≤H₃Less than or equal to 0.23mm, the width and the height of the second interconnection structure 3 are reasonable, the second interconnection structure 3 can be firmly welded with the first sheet 11, the thickness of a back packaging material can be reduced, and the risk of hidden cracking of the battery sheet 1 is reduced. By making W₄、H₄Respectively satisfy: w is not less than 0.6mm₄≤1.2mm，0.1mm≤H₄Less than or equal to 0.25mm, the width and the height of the above-mentioned one end of first interconnection structure spare 2 are comparatively reasonable, can improve the welding pulling force between above-mentioned one end of first interconnection structure spare 2 and the battery piece 1 that corresponds, and can reduce back packaging material's thickness equally, improve photovoltaic module 200's reliability. Moreover, the width of the second interconnecting structural member 3 may be smaller than the width of the one end of the first interconnecting structural member 2, the height of the second interconnecting structural member 3 may be smaller than the height of the one end of the first interconnecting structural member 2, so that the cross-sectional area of the second interconnecting structural member 3 may be smaller than the cross-sectional area of the one end of the first interconnecting structural member 2, and the stretching ratio of the second interconnecting structural member 3 may be larger than the stretching ratio of the first interconnecting structural member 2, thereby increasing the length of the second interconnecting structural member 3 and realizing the reservation of the head end solder strip of the battery string 100.

In some optional embodiments of the present invention, each of the first interconnection structures 2 includes a first connection section 21 and a second connection section 22 connected to each other, the first connection section 21 is flat, at least a portion of the first connection section 21 is connected to the back surface of the battery piece 1, the second connection section 22 is non-flat, the second connection section 22 is connected to the front surface of the adjacent battery piece 1, the second interconnection structure 3 is flat, and the third interconnection structure 4 is non-flat. According to the arrangement, the first connecting section 21 and the second interconnecting structural member 3 are large in width and small in thickness, when the first connecting section 21 and the second interconnecting structural member 3 are welded with the corresponding battery piece 1, the contact area between the first connecting section 21 and the corresponding battery piece 1 can be increased, and therefore large welding tension force is generated between the first connecting section 21 and the battery piece 1 and between the second interconnecting structural member 3 and the battery piece 1, connection is firmer, the thickness of a back face packaging material can be reduced, and the risk that the battery piece 1 is hidden to be cracked is reduced. Moreover, since the second connecting section 22 and the third interconnecting structural member 4 are non-flat, the shielding area of the second connecting section 22 and the third interconnecting structural member 4 to the cell sheet 1 can be reduced, the reflectivity can be improved, and the output power of the photovoltaic module 200 can be improved.

In some embodiments of the present disclosure, referring to fig. 3-7, photovoltaic assembly 200 includes at least one cell stack, an intermediate bus bar 204, and a plurality of end bus bars 203. The battery cell group comprises two battery cells which are connected in parallel and are arranged along the arrangement direction of the battery sheets 1 in the string, each battery cell comprises two battery strings 100 which are connected in series and are arranged along the string arrangement direction which is perpendicular to the arrangement direction of the battery sheets 1 in the string, and the two battery strings 100 are a first battery string 201 and a second battery string 202 respectively.

Here, it should be noted that the "arrangement direction of the cells 1 in the string" may be understood as an arrangement direction of the plurality of cells 1 in each cell string 100 (for example, the up-down direction in fig. 3 and 4); the "string arrangement direction" is a direction (for example, the left-right direction in fig. 3 and 4) perpendicular to the "arrangement direction of the cells 1 in the string".

For example, one cell group is shown in the example of fig. 3, two cells of the cell group may be arranged along a long side of the photovoltaic module 200, and the first cell string 201 and the second cell string 202 of each cell may be arranged along a short side of the photovoltaic module 200. The plurality of cells 1 in the first cell string 201 and the second cell string 202 of each cell unit may extend linearly along the long side of the photovoltaic module 200, and the number of cells 1 in the first cell string 201 and the number of cells 1 in the second cell string 202 of each cell unit may be equal. Therefore, the circuit design of the photovoltaic module 200 is simple, the processing is convenient, all the battery pieces 1 can be regularly and relatively closely arranged, and the reduction of the occupied space of the whole photovoltaic module 200 is facilitated while the electric connection between two adjacent battery pieces 1 in the battery string 100 is facilitated.

One cell stack is shown in fig. 3 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to two, three or more cell stacks, which also falls within the protection scope of the present invention.

The end bus bars 203 are respectively located at two ends of the battery cell group along the arrangement direction of the battery sheets 1 in the string, each end bus bar 203 extends along the string arrangement direction, the first sheet 11 of the first battery string 201 is electrically connected with the corresponding end bus bar 203 through the second interconnection structural member 3, and the tail sheet 12 of the second battery string 202 is electrically connected with the corresponding end bus bar 203 through the third interconnection structural member 4. For example, two end bus bars 203 are shown in the examples of fig. 3 and 4, the two end bus bars 203 being located at both ends of the cell group in the arrangement direction of the cells 1 in the string, respectively. Thus, the end bus bar 203 can be electrically connected to the back surface of the first cell string 201 first sheet 11 and the front surface of the second cell string 202 second sheet 12 at the same time, and since the polarity of the front surface and the back surface of the cell sheet 1 are opposite, the end bus bar 203 can realize the transmission of current between the first cell string 201 and the second cell string 202, thereby realizing the series connection of the first cell string 201 and the second cell string 202.

The intermediate bus bar 204 is located between two battery cells of the same battery cell group, the intermediate bus bar 204 extends along the string arrangement direction, the tail piece 12 of the first battery string 201 is electrically connected with the intermediate bus bar 204 through the third interconnecting structural member 4, and the head piece 11 of the second battery string 202 is electrically connected with the intermediate bus bar 204 through the second interconnecting structural member 3. For example, referring to fig. 3 to 7, two first cell strings 201 of two cells are opposite to each other and two second cell strings 202 are opposite to each other in the arrangement direction of the cells 1 within the strings. Wherein the intermediate bus bar 204 may include a plurality of bus bar segments. Thus, by providing the intermediate bus bar 204 as described above, on the one hand, the intermediate bus bar 204 can achieve parallel connection between two battery cells; on the other hand, the intermediate bus bar 204 may be electrically connected to the front surface of the tail piece 12 of the first cell string 201 and the back surface of the head piece 11 of the second cell string 202 at the same time, and when there are a plurality of cell groups, the plurality of cell groups may be connected in series, and the current of the cell groups may be effectively discharged.

Other constructions and operations of the photovoltaic module 200 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, "the first feature", "the second feature", and "the third feature" may include one or more of the features.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, comprising:

the battery pack comprises a plurality of battery strings, each battery string comprises a plurality of battery sheets connected in series, two battery sheets positioned at two ends of each battery string are respectively a first sheet and a tail sheet, the edge of one side of each battery sheet adjacent to the first sheet is a first edge, and the edge of each battery sheet opposite to the first edge is a second edge;

a plurality of first interconnection structures, one end of each first interconnection structure is connected to the back of the battery plate, and the minimum distance between the one end of each first interconnection structure and the corresponding second edge is D₁The other end of each first interconnection structure is connected to the front surface of the adjacent battery piece, and the other end of each first interconnection structure is connected with the corresponding first interconnection structureThe minimum distance between the edges is D₂；

A second interconnecting structure, at least a portion of which is connected to the back side of the first sheet, the second interconnecting structure having a minimum distance D between an end adjacent to the second edge and the corresponding second edge₃；

A third interconnecting structure, at least a portion of the third interconnecting structure being connected to the front face of the tail piece, a minimum distance D between an end of the third interconnecting structure adjacent the first edge and the corresponding first edge₄，

Wherein, D is₁、D₂、D₃、D₄Satisfies the following conditions:

D₃＞D₁and/or

D₄＞D₂。

2. Photovoltaic module according to claim 1, characterized in that D₁、D₂、D₃、D₄Further satisfies the following conditions: d₃＞D₁And D is₄＝D₂。

3. The photovoltaic module of claim 1, wherein when D is₃＞D₁When is in contact with D₁、D₃Further satisfies the following conditions: d is more than 0mm₃-D₁≤19mm。

4. The assembly according to claim 1, wherein a plurality of back bus bars are disposed on a back surface of each cell, the one end of the first interconnection structure and the second interconnection structure are electrically connected to the corresponding back bus bars on the cell, the back bus bars include a plurality of back electrodes spaced apart along an extending direction of the cell string, and a minimum distance D between the back electrode closest to the second edge of the first cell and the corresponding second edge of the first cell is₅Wherein, the D is₅、D₃Satisfies the following conditions: d is less than or equal to-4 mm₅-D₃≤2mm。

5. The photovoltaic module according to claim 4, wherein the minimum distance between the back electrode closest to the second edge and the corresponding second edge of the other cell pieces except the first piece is D₆Said D is₅、D₆Further satisfies the following conditions: d₅＞D₆。

6. The photovoltaic module according to claim 4, wherein the minimum distance between the back electrode closest to the second edge and the corresponding second edge of the other cell pieces except the first piece is D₆Wherein, the D is₁、D₆Satisfies the following conditions: d is less than or equal to-1 mm₆-D₁≤15mm。

7. The photovoltaic module of claim 1, wherein when D is₄＞D₂When is in contact with D₂、D₄Further satisfies the following conditions: d is more than 0mm₄-D₂＜10mm。

8. The photovoltaic module of any of claims 1-7, wherein the first plurality of interconnecting structures have the same electrical resistance value, and each of the first interconnecting structures has an electrical resistance value of R₁The resistance value of the second interconnection structure is R₂The resistance value of the third interconnection structure is R₃，

Wherein, R is₁、R₂、R₃Satisfies the following conditions:

R₂＞R₁and/or

R₃＞R₁。

9. The photovoltaic module of claim 8, wherein R is₁、R₂、R₃Further satisfies the following conditions:

5％≤(R₂-R₁)/R₁less than or equal to 20%, and/or

5％≤(R₃-R₁)/R₁≤20％。

10. The photovoltaic module of claim 8, wherein R is₂、R₃Respectively satisfy: 185m omega/m is less than or equal to R₂≤265mΩ/m，185mΩ/m≤R₃≤265mΩ/m。

11. The photovoltaic module of claim 8, wherein R is₁Satisfies the following conditions: r is more than or equal to 180m omega/m₁≤220mΩ/m。

12. The photovoltaic assembly of any of claims 1-7, wherein the first interconnecting structural member has a stretch ratio λ₁A stretch ratio of said second interconnecting structural member is λ₂A stretch ratio of said third interconnecting structural member is λ₃Wherein, said λ₁、λ₂、λ₃Satisfies the following conditions:

λ₂＞λ₁and/or

λ₃＞λ₁。

13. Photovoltaic module according to claim 12, characterized in that λ₁、λ₂、λ₃Further satisfies the following conditions:

4％≤λ₂-λ₁less than or equal to 15.3%, and/or

4％≤λ₃-λ₁≤15.3％。

14. Photovoltaic module according to claim 12, characterized in that λ₂、λ₃Respectively satisfy: lambda is more than or equal to 6%₂≤15.8％，6％≤λ₃≤15.8％。

15. Photovoltaic module according to claim 12, characterized in that λ₁Satisfies the following conditions:0.5％≤λ₁≤2％。

16. the photovoltaic assembly of any of claims 1-7, wherein the third interconnecting structure has a width W₁The height of the third interconnecting structural member is H₁Wherein, the W₁、H₁Respectively satisfy: w is not less than 0.32mm₁≤0.38mm，0.3mm≤H₁≤0.34mm；

The other end of the first interconnecting structure has a width W₂Said other end of said first interconnecting structural member has a height H₂Wherein, the W₂、H₂Respectively satisfy: w is not less than 0.35mm₂≤0.4mm，0.32mm≤H₂≤0.37mm。

17. The photovoltaic assembly of any of claims 1-7, wherein the second interconnecting structure has a width W₃The height of the second interconnection structure is H₃Wherein, the W₃、H₃Respectively satisfy: w is not less than 0.55mm₃≤1.1mm，0.08mm≤H₃≤0.23mm；

The one end of the first interconnecting structural member has a width W₄Said one end of said first interconnecting structural member has a height H₄Wherein, the W₄、H₄Respectively satisfy: w is not less than 0.6mm₄≤1.2mm，0.1mm≤H₄≤0.25mm。

18. The assembly defined in any one of claims 1 to 7, wherein each of the first interconnecting structural members includes a first connecting section and a second connecting section connected to each other, the first connecting section is flat in shape, at least a portion of the first connecting section is connected to the back side of the cell sheet, the second connecting section is non-flat in shape, the second connecting section is connected to the front side of the adjacent cell sheet, the second interconnecting structural member is flat in shape, and the third interconnecting structural member is non-flat in shape.

19. A photovoltaic module according to any of claims 1 to 7, characterized by comprising:

the battery pack comprises two battery units which are connected in parallel and are arranged along the arrangement direction of battery pieces in a string, each battery unit comprises two battery strings which are connected in series and are arranged along the string arrangement direction which is vertical to the arrangement direction of the battery pieces in the string, and the two battery strings are a first battery string and a second battery string respectively;

a plurality of end bus bars, the end bus bars being respectively located at two ends of the cell stack along the arrangement direction of the cells in the string, each end bus bar extending along the string arrangement direction, the first cell of the first cell string being electrically connected to the corresponding end bus bar through the second interconnection structure, and the last cell of the second cell string being electrically connected to the corresponding end bus bar through the third interconnection structure;

the middle bus bar is located on the same two battery units of the battery unit group, the middle bus bar extends along the string arrangement direction, the tail piece of the first battery string passes through the third interconnection structural member and is electrically connected with the middle bus bar, and the head piece of the second battery string passes through the second interconnection structural member and is electrically connected with the middle bus bar.