CN214505519U - Photovoltaic module - Google Patents

Abstract

The utility model discloses a photovoltaic module, photovoltaic module includes: a plurality of battery strings, each battery string including a plurality of battery pieces connected in series; a plurality of first interconnection structures, the resistance values of the plurality of first interconnection structures are all the same, and the resistance value of the first interconnection structure is R₁One end of each first interconnection structure member is connected to the back surface of a battery plate, and the other end of each first interconnection structure member is connected to the front surface of the adjacent battery plate; a second interconnection structure, at least a part of the second interconnection structure is connected to the back of the first chip, and the resistance value of the second interconnection structure is R₂(ii) a Third interconnect structureA third interconnecting structure member having at least a portion thereof connected to the front surface of the tail piece and having a resistance value R₃，R₁、R₂、R₃Satisfies the following conditions: r₂＞R₁And/or R₃＞R₁. According to the utility model discloses a photovoltaic module can realize the reservation of the head end solder strip and/or the tail end solder strip of battery cluster, and has reduced 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: each battery string comprises a plurality of battery pieces connected in series, and the two battery pieces at the two ends of each battery string are respectively a first piece and a tail piece; a plurality of first interconnecting structural members, a plurality of the first interconnecting structural members all having the same resistance value, each of the first interconnecting structural members having a resistance value of R₁One end of each first interconnection structure member is connected to the back surface of the battery plate, and the other end of each first interconnection structure member is connected to the adjacent first interconnection structure memberThe front surface of the battery piece; a second interconnect structure, at least a portion of the second interconnect structure being connected to the back of the first die, the second interconnect structure having a resistance value of R₂(ii) a A third interconnect structure having at least a portion thereof connected to the front side of the tail piece, the third interconnect structure having a resistance value R₃Wherein, said R₁、R₂、R₃Satisfies the following conditions: r₂＞R₁And/or R₃＞R₁。

According to the utility model discloses photovoltaic module is through making at least part of second interconnect structure connect the back at first piece to make at least part of third interconnect structure connect the front at the tail piece, and the resistance value R of first interconnect structure₁Resistance value R of the second interconnection structure₂And resistance value R of the third interconnection structure₃Satisfy R₂＞R₁And/or R₃＞R₁The length of the second interconnection structure member and/or the length of the third interconnection structure member are/is larger, and the waste of the welding strips can be effectively reduced while the reservation of the head end welding strips and/or the tail end welding strips of the battery string is realized, so that the cost of the photovoltaic module can be reduced, and the processing efficiency of the photovoltaic module can be effectively improved.

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 λ₂The first mentionedThe tensile ratio of the three-interconnection structure is lambda₃Wherein, 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 cross-sectional area of the second interconnecting structure is smaller than the cross-sectional area of the one end of the first interconnecting structure; and/or the cross-sectional area of the third interconnecting structure is less than the cross-sectional area of the other end of the first interconnecting structure.

According to some embodiments of the invention, 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≤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 width of the one end of the first interconnecting structure isW₄Said 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 utility model, every be neighbouring of battery piece the edge of first piece place one side is first edge, every the front of battery piece is equipped with a plurality of positive main grid lines, first interconnect structure the other end with third interconnect structure respectively with correspond on the battery piece positive main grid line electricity is connected, positive main grid line includes the edge a plurality of pads that the extending direction interval of first interconnect structure was arranged, and is a plurality of in the pad with first edge distance is nearest the pad with correspond distance between the first edge is d₁Wherein d is₁Satisfies the following conditions: d is not less than 5mm₁≤10mm。

According to some embodiments of the utility model, every be neighbouring of battery piece the edge of tail piece place one side is the second edge, 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 first interconnect structure was arranged, and is a plurality of in the back electrode with the second edge is nearest apart from back electrode and corresponding distance between the second edge is d₂Wherein d is₂Satisfies the following conditions: d is not less than 5mm₂≤10mm。

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 the circled portion C of FIG. 4;

fig. 8 is a schematic front structural view of a battery plate according to an embodiment of the present invention.

Reference numerals:

100: a battery string;

1: a battery piece; 11: first sheet; 12: a tail piece;

13: an intermediate sheet; 14: a front side main gate line; 141: a pad;

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. 1-8.

As shown in fig. 1 and 2, 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. Optionally, at least one intermediate sheet 13 may be provided between the leading sheet 11 and the trailing sheet 12. The resistance values of the plurality of first interconnection structures 2 are all the same, and the resistance value of each first interconnection structure 2 is 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.

One end of each first interconnection structure member 2 is connected to the back surface of the cell sheet 1, and the other end of each first interconnection structure member 2 is connected to the front surface of the adjacent cell sheet 1. 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. Thus, by providing the first interconnection structure 2, electrical connection between two adjacent battery cells 1 can be achieved. Moreover, the resistance values of the plurality of first interconnection structures 2 are all the same, and the currents flowing through the plurality of first interconnection structures 2 when the voltages are the same are all the same, so that the plurality of first interconnection structures 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.

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 entirely attached to the back of the first sheet 11, or may be partially attached to the back of the first sheet 11 and partially extended beyond the edge of the first sheet 11. At least a portion of the third interconnecting structural member 4 is attached to the front face of the tail piece 12. Similarly, the third interconnecting structural member 4 may be attached entirely to the front surface of the tail piece 12, or may be attached partially to the front surface of the tail piece 12 and extend partially beyond the edge of the tail piece 12.

The second interconnection structure 3 has a resistance value R₂The third interconnection structure 4 has a resistance value R₃Wherein R is₁、R₂、R₃Satisfies the following conditions: r₂＞R₁And/or R₃＞R₁. That is, R may be₂＞R₁，R₃≤R₁(ii) a Or, R₃＞R₁，R₂≤R₁(ii) a Of course, R may also be₂＞R₁And R is₃＞R₁。

Thereby, by making R₂＞R₁And/or R₃＞R₁When R is₂＞R₁During the process, 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, so that the stretch ratio of the second interconnecting structural member 3 may be larger than the stretch ratio of the first interconnecting structural member 2, and the length of the second interconnecting structural member 3 may be increased, so that one end of the second interconnecting structural member 3, which is far away from the center of the battery string 100, may extend to an edge of one side, which is far away from the center of the battery string 100, of the first sheet 11, and the reservation of the first-end solder strip of the battery string 100 is realized; when R is₃＞R₁During the process, the cross-sectional area of the third interconnecting structural member 4 is smaller than the cross-sectional area of the other end of the first interconnecting structural member 2, so that the stretching ratio of the third interconnecting structural member 4 can be larger than the stretching ratio of the first interconnecting structural member 2, the length of the third interconnecting structural member 4 can be increased, and further, one end of the third interconnecting structural member 4, which is far away from the center of the battery string 100, can extend to the edge of one side, which is far away from the center of the battery string 100, of the tail piece 12, so that the tail end welding strip of the battery string 100 is reservedThe capacity of the machine.

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 resistance value R of first interconnected structure 2₁Resistance value R of the second interconnection structure 3₂And the resistance value R of the third interconnection structure 4₃Satisfy R₂＞R₁And/or R₃＞R₁The length of the second interconnection structure member 3 and/or the third interconnection structure member 4 is made to be larger, so that the waste of the welding strips can be effectively reduced while the reservation of the head end welding strips and/or the tail end welding strips of the battery string 100 is realized, thereby reducing the cost of the photovoltaic module 200 and effectively improving the processing efficiency of the photovoltaic module 200.

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, and one end of the second interconnecting structural member 3 far away from the center of the battery string 100 may not extend to the edge of one side of the first sheet 11 far away from the center of the battery string 100, so that the reservation of the welding strip at the head end of the battery string 100 cannot be realized; if (R)₂-R₁)/R₁More than 20%, the increase rate of the resistance value of the second interconnection structure 3 relative to the first interconnection structure 2 is too large, which may cause the poor conductivity and the too low structural strength of the second interconnection structure 3, affecting the output of the photovoltaic module 200Power and long term reliability.

Similarly, when R is₃＞R₁When is (R) is not present₃-R₁)/R₁If the resistance value of the third interconnecting structural member 4 is less than 5%, the increase rate of the resistance value of the third interconnecting structural member 4 relative to the first interconnecting structural member 2 is too small, the length of the third interconnecting structural member 4 may be too small, and one end of the third interconnecting structural member 4 far away from the center of the battery string 100 may not extend beyond the edge of one side of the tail piece 12 far away from the center of the battery string 100, so that the reservation of the tail end welding strip of the battery string 100 cannot be realized; when (R)₃-R₁)/R₁If the resistance value of the third interconnecting structural member 4 is larger than 20%, the conductivity of the third interconnecting structural member 4 may be too poor, and the structural strength may be too low, which may affect the output power of the photovoltaic module 200.

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 can be 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 output power and the long-term 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 interconnecting structural member 3 is too small and the cross-sectional area of the second interconnecting structural member 3 is too large, the stretching ratio of the second interconnecting structural member 3 is too small and the length is too small, so that 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 a third interconnect structure4, the conductivity is too poor and the structural strength is too low. Thereby, by making R₂、R₃Respectively satisfy: 185m omega/m is less than or equal to R₂≤265mΩ/m，185mΩ/m≤R₃The thickness is less than or equal to 265m omega/m, on one hand, the 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, under the prerequisite of guaranteeing that first interconnection structure 2 has stronger electrically conductive ability, 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 of the stretched second interconnecting structural member 3, which is far away from the center of the battery string 100, can extend beyond one side edge of the first sheet 11, which is far away from the center of the battery string 100, so that 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 of the photovoltaic module 200 can be reducedThe amount of tape used; when lambda is₃＞λ₁During the process, the third interconnecting structural member 4 is relatively large in stretching, one end of the stretched third interconnecting structural member 4, which is far away from the center of the cell string 100, can extend to the edge of one side, which is far away from the center of the cell string 100, of the tail piece 12, so that the total weight of the third interconnecting structural member 4 can be unchanged while the tail end solder strip of the cell string 100 is reserved, and the amount of the solder strip of the photovoltaic module 200 can also be reduced.

In some embodiments of the 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 one end of the second interconnecting structural member 3 far away from the center of the battery string 100 may not extend beyond one side edge of the first sheet 11 far away from the center of the battery string 100, so that the reservation of the welding strip at the head end of the battery string 100 cannot be realized; if λ₂-λ₁More 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 is too large, resulting in too large length of the second interconnect structure 3, which may result in too poor electrical conductivity of the second interconnect structure 3, 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-λ₁Greater than 15.3%, the draw ratio of the third interconnecting member 4 is too different from the draw ratio of the first interconnecting member 2This may result in poor electrical conductivity and low structural strength of the second interconnect structure 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 the second interconnection structural member 3 and the third interconnection structural member 4 are ensured to have stronger conductive capability and higher structural strength while the reservation of the head end welding strip and/or the tail end welding strip of the cell string 100 is realized, 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 poor electrical conductivity and 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 embodiments of the present invention, as shown in fig. 1-3 and 8, each cell 1 is made ofThe edge of the side adjacent to the first sheet 11 is a first edge, the front surface of each cell 1 is provided with a plurality of front surface main grid lines 14, the other end of the first interconnection structure 2 and the third interconnection structure 4 are respectively electrically connected with the corresponding front surface main grid lines 14 on the cell 1, each front surface main grid line 14 comprises a plurality of pads 141 arranged at intervals along the extending direction of the first interconnection structure 2, and the pad 141 closest to the first edge among the plurality of pads 141 and the corresponding first edge have a distance d₁Wherein d is₁Satisfies the following conditions: d is not less than 5mm₁Less than or equal to 10 mm. 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.

For example, when d₁If the distance between the pad 141 closest to the first edge and the corresponding first edge is too small, the distance between the start welding point of the first interconnection structure 2 and the third interconnection structure 4 and the corresponding first edge is too small, and the stretching length of the first interconnection structure 2 and the third interconnection structure 4 is too large, so that the structural strength of the first interconnection structure 2 and the third interconnection structure 4 is too low, and the process risk is possibly brought about; when d is₁When the distance between the pad 141 closest to the first edge among the plurality of pads 141 and the corresponding first edge is too large, the current collection may be affected. Thereby, by making d₁Satisfies the following conditions: d is not less than 5mm₁Less than or equal to 10mm, the first interconnection structure member 2 and the third interconnection structure member 4 are ensured to have higher structural strength, and meanwhile, the current is led out, so that the output power of the photovoltaic module 200 can be effectively improved.

In some embodiments of the present invention, the edge of one side of each cell 1 adjacent to the tail piece 12 is the second edge, 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 with 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 first interconnection structure 2, the distance between the back electrode closest to the second edge among the plurality of back electrodes and the corresponding second edge is d₂Which isIn d₂Satisfies the following conditions: d is not less than 5mm₂≤10mm。

For example, when d₂When the distance between the back electrode closest to the second edge of the plurality of back electrodes and the corresponding second edge is too small, the distance between the ending point of the first interconnecting structural member 2 and one end of the second interconnecting structural member 3 adjacent to the center of the battery string 100 and the corresponding second edge is too small, the stretching length of the first interconnecting structural member 2 and the second interconnecting structural member 3 is too large, the structural strength of the first interconnecting structural member 2 and the second interconnecting structural member 3 is possibly too low, and the manufacturing process risk is also possibly brought about; when d is₂When the distance between the back electrode closest to the second edge among the plurality of back electrodes and the corresponding second edge is too large, the current collection may be affected. Thereby, by making d₂Satisfies the following conditions: d is not less than 5mm₂Less than or equal to 10mm, the first interconnection structure member 2 and the second interconnection structure member 3 can be ensured to have higher structural strength, and the derivation of current is also facilitated, so that the output power of the photovoltaic module 200 can be further improved.

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 W₂The height of the other end of the first interconnecting structural 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 in full contact with the front main grid line 14 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; of the third interconnecting structural part 4, on the other handThe height is more reasonable, can effectively reflect sunlight, improves the light utilization ratio, and can avoid the cell 1 to produce the lobe of a leaf.

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 14 on the corresponding first sheet 11 and the 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 14, 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. In addition, the width of the third interconnecting structural member 4 may be smaller than the width of the other end of the first interconnecting structural member 2, the height of the third interconnecting structural member 4 may be smaller than the height of the other end of the first interconnecting structural member 2, so that the cross-sectional area of the third interconnecting structural member 4 may be smaller than the cross-sectional area of the other end of the first interconnecting structural member 2, and the stretching ratio of the third interconnecting structural member 4 may be larger than the stretching ratio of the first interconnecting structural member 2, thereby increasing the length of the third interconnecting structural member 4 and realizing the reservation of the welding strip at the tail end of the battery string 100.

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, as shown in fig. 2, each first interconnection structure 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. For example, the second interconnecting structural member 3 and the third interconnecting structural member 4 may now be cut from the same profiled weld bead. When the length of the battery sheet 1 is 210mm and each battery sheet 1 is one-half of a complete battery sheet, the length of the first interconnection structure 2 may be 190mm to 200mm (inclusive), and the sum of the reserved length of the leading end bonding strip and the reserved length of the trailing end bonding strip of the battery string 100 may be 12mm to 30mm (inclusive). But is not limited thereto.

Therefore, through 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 the first connecting section 21, the second interconnecting structural member 3 and the battery piece 1 have large welding tension, connection is firmer, the thickness of a back surface packaging material can be reduced, and the risk of hidden cracking of the battery piece 1 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.

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", "the third feature", "the fourth feature", "the fifth feature", and "the sixth 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 (15)

1. A photovoltaic module, comprising:

each battery string comprises a plurality of battery pieces connected in series, and the two battery pieces at the two ends of each battery string are respectively a first piece and a tail piece;

a plurality of first interconnecting structural members, a plurality of the first interconnecting structural members all having the same resistance value, each of the first interconnecting structural members having a resistance value of R₁One end of each first interconnection structure member is connected to the back surface of the battery plate, and the other end of each first interconnection structure member is connected to the front surface of the adjacent battery plate;

a second interconnect structure, at least a portion of the second interconnect structure being connected to the back of the first die, the second interconnect structure having a resistance value of R₂；

A third interconnect structure having at least a portion thereof connected to the front side of the tail piece, the third interconnect structure having a resistance value R₃，

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

R₂＞R₁and/or

R₃＞R₁。

2. The photovoltaic module of claim 1, 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％。

3. The photovoltaic module of claim 1, wherein R is₂、R₃Respectively satisfy: 185m omega/m is less than or equal to R₂≤265mΩ/m，185mΩ/m≤R₃≤265mΩ/m。

4. The photovoltaic module of claim 1, wherein R is₁Satisfies the following conditions: r is more than or equal to 180m omega/m₁≤220mΩ/m。

5. The photovoltaic assembly of claim 1, wherein the first interconnecting structure 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。

6. Photovoltaic module according to claim 5, characterized in that said λ₁、λ₂、λ₃Further satisfies the following conditions:

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

4％≤λ₃-λ₁≤15.3％。

7. Photovoltaic module according to claim 5, characterized in that said λ₂、λ₃Respectively satisfy: lambda is more than or equal to 6%₂≤15.8％，6％≤λ₃≤15.8％。

8. Photovoltaic module according to claim 5, characterized in that said λ₁Satisfies the following conditions: lambda is more than or equal to 0.5%₁≤2％。

9. The photovoltaic assembly of claim 1, wherein the cross-sectional area of the second interconnecting structure is less than the cross-sectional area of the one end of the first interconnecting structure; and/or

The cross-sectional area of the third interconnecting structure is less than the cross-sectional area of the other end of the first interconnecting structure.

10. The photovoltaic assembly of any of claims 1-9, 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。

11. The photovoltaic assembly of any of claims 1-9, 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。

12. The photovoltaic module of any of claims 1-9, wherein the edge of each of the cell pieces adjacent to the side of the first piece is a first edge,

the front surface of each cell is provided with a plurality of front surface main grid lines, the other end of the first interconnection structure and the third interconnection structure are respectively and electrically connected with the corresponding front surface main grid lines on the cell, each front surface main grid line comprises a plurality of bonding pads which are arranged at intervals along the extending direction of the first interconnection structure, and the bonding pad which is closest to the first edge in the bonding pads is away from the corresponding first edge by a distance d₁Wherein d is₁Satisfies the following conditions: d is not less than 5mm₁≤10mm。

13. The photovoltaic module of any of claims 1-9, wherein the edge of each of the cell pieces adjacent to the side of the tail piece is a second edge,

the back of each cell is provided with a plurality of back main grid lines, the one end of the first interconnection structure and the second interconnection structure are respectively and electrically connected with the corresponding back main grid lines on the cell, the back main grid lines comprise a plurality of back electrodes which are arranged at intervals along the extending direction of the first interconnection structure, and the distance between the back electrode which is closest to the second edge in the plurality of back electrodes and the corresponding second edge is d₂Wherein d is₂Satisfies the following conditions: d is not less than 5mm₂≤10mm。

14. The assembly defined in any one of claims 1-9, 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.

15. A photovoltaic module according to any of claims 1-9, 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.

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