Battery string assembly and photovoltaic assembly with same

Abstract

The utility model discloses a battery string assembly and a photovoltaic assembly with the same. The battery string assembly comprises a plurality of battery pieces, the battery pieces are sequentially arranged in the first direction, a plurality of auxiliary grid lines are arranged on the surface of each battery piece, and the auxiliary grid lines continuously extend in the second direction perpendicular to the first direction and are spaced in the first direction; the plurality of bonding pads are arranged at the two ends of the surface of each battery piece in the first direction; the plurality of grid line segments are located between the plurality of bonding pads at the two ends in the first direction, the plurality of grid line segments are spaced along the first direction and the second direction, and each grid line segment extends along the second direction and covers a part of the corresponding auxiliary grid line; and a plurality of interconnection structural members, each interconnection structural member extends along the first direction, two adjacent battery pieces are connected in series through the plurality of interconnection structural members, and the interconnection structural members are connected to the sides, far away from the battery pieces, of the corresponding bonding pads at the two ends and are connected to the corresponding grid line segments.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a battery string component and a photovoltaic component having the same. Background Art

[0002] In the related art, the grid line is an important component of the photovoltaic cell, which is responsible for guiding the photocurrent in the photovoltaic cell to the outside of the photovoltaic cell. However, photovoltaic cells are easily affected by factors such as grid line printing equipment, improper operation of operators, and environmental factors such as workshop temperature, which may cause grid breakage. Grid breakage affects the amount of photocurrent guided out, thereby affecting the yield rate of the photovoltaic cell, and also affects the appearance of the photovoltaic cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery string assembly, which can ensure that the photocurrent can be guided out as much as possible, thereby ensuring the assembly yield and having a beautiful appearance.

[0004] Another object of the present invention is to provide a photovoltaic assembly having the above-mentioned battery string assembly.

[0005] In order to achieve the above-mentioned purpose, according to an embodiment of the first aspect of the utility model, a battery string assembly is proposed, comprising: a plurality of battery cells, the plurality of battery cells are arranged in sequence along a first direction, a plurality of secondary grid lines are provided on the surface of each of the battery cells, the plurality of secondary grid lines extend continuously along a second direction perpendicular to the first direction and are spaced apart along the first direction; a plurality of welding pads, the plurality of welding pads are provided at both ends of the surface of each of the battery cells in the first direction; a plurality of grid line segments, the plurality of grid line segments are located between the plurality of welding pads at the two ends in the first direction, the plurality of grid line segments are spaced apart along the first direction and the second direction, each of the grid line segments extends along the second direction and covers a portion of the corresponding secondary grid line; and a plurality of interconnection structures, each of the interconnection structures extends along the first direction and two adjacent battery cells are connected in series through the plurality of interconnection structures, wherein the interconnection structures are connected to a side of the corresponding welding pads located at the two ends away from the battery cell and are connected to the corresponding grid line segments.

[0006] According to the battery string assembly of the embodiment of the utility model, multiple pads are arranged at both ends of the surface of each battery cell in the first direction, multiple grid line segments are located between the multiple pads at the two ends in the first direction, and the multiple grid line segments are spaced apart along the first direction and the second direction, each grid line segment extends along the second direction and covers a portion of the corresponding secondary grid line, each interconnection structure extends along the first direction and two adjacent battery cells are connected in series through multiple interconnection structures, and the interconnection structures are connected to the side of the corresponding pads located at both ends away from the battery cell and connected to the corresponding grid line segments, which can ensure that even if the secondary grid line is off at this position, the grid line segment can replace the off grid part to ensure that the entire secondary grid line can still successfully guide the photocurrent, and can avoid the problem of poor welding or cold welding of the interconnection structure, and can also significantly reduce the manufacturing cost of the battery string assembly.

[0007] According to some embodiments of the utility model, the multiple solder pads are divided into two columns of solder pads, the two columns of solder pads include a first column of solder pads and a second column of solder pads, the first column of solder pads and the second column of solder pads are respectively located at both ends of the battery cell along the first direction, the first column of solder pads includes a plurality of first solder pads spaced apart along the second direction, the second column of solder pads includes a plurality of second solder pads spaced apart along the second direction, and each of the interconnecting structural members is connected to the corresponding first solder pad and second solder pad.

[0008] According to some embodiments of the utility model, the plurality of gate line segments are arranged in a plurality of rows and columns, the plurality of rows of gate line segments are spaced apart from each other along the second direction, and the plurality of columns of gate line segments are spaced apart from each other along the first direction. The gate line segments in each column are spaced apart from each other along the second direction, and respectively cover a portion of the same secondary gate line; and the gate line segments in each row are spaced apart from each other along the first direction, and two pads in the two columns of pads that are arranged opposite to each other in the first direction are respectively located at two ends of a corresponding row of gate line segments.

[0009] According to some embodiments of the present invention, the distance between each of the solder pads and the edge of one of the two ends of the battery cell that is closer to the solder pad is D, where D satisfies: 3mm≤D≤20mm.

[0010] According to some embodiments of the present invention, the length of the gate line segment in the second direction is greater than the width of the interconnection structure in the second direction.

[0011] According to some embodiments of the present invention, the length of the gate line segment in the second direction is L, wherein L satisfies 0.2 mm≤L≤2 mm.

[0012] According to some embodiments of the present invention, the width of the gate line segment in the first direction is W, wherein W satisfies 0.02 mm≤W≤0.5 mm.

[0013] According to some embodiments of the present invention, the grid line segment is in a rectangular, diamond or dumbbell shape.

[0014] According to some embodiments of the present invention, the structures of the multiple pads are the same, the length of the pad in the second direction is L1, and the width of the pad in the first direction is W1, wherein L1 and W1 respectively satisfy: 0.5mm≤L1≤2.0mm, 0.3mm≤W1≤2.0mm.

[0015] According to some embodiments of the present invention, the cross-sectional shape of the pad is a rectangle, a chamfered rectangle or a rounded rectangle.

[0016] According to some embodiments of the present invention, the interconnection structure is connected to a center position of the pad in the second direction and to a center position of a corresponding gate line segment in the second direction.

[0017] According to some embodiments of the present invention, the surface includes a front side and a back side in a thickness direction of the battery cell, and the front side and the back side are both provided with the plurality of auxiliary grid lines, the plurality of pads, the plurality of grid line segments and the plurality of interconnection structures.

[0018] According to some embodiments of the present invention, the number of the plurality of secondary grid lines on the front side is different from the number of the secondary grid lines on the back side.

[0019] According to some embodiments of the present invention, the number of the plurality of secondary grid lines on the front side is n1, and the number of the plurality of secondary grid lines on the back side is n2, wherein n1 and n2 respectively satisfy: 40≤n1≤400, 40≤n2≤400.

[0020] According to some embodiments of the present invention, the number of pads on the front side is twice the number of interconnection structures on the front side; and the number of pads on the back side is twice the number of interconnection structures on the back side.

[0021] According to some embodiments of the utility model, the battery string assembly further includes: an auxiliary film, which is arranged on a side of the plurality of interconnecting structural members away from the battery cells and covers the plurality of interconnecting structural members and the plurality of welding pads, and the area of ​​the auxiliary film is less than or equal to the area of ​​the battery cells.

[0022] According to some embodiments of the present invention, the length of the auxiliary film in the second direction is less than or equal to the length of the battery cell in the second direction, and the width of the auxiliary film in the first direction is less than or equal to the width of the battery cell in the first direction.

[0023] According to some embodiments of the present invention, the auxiliary film is attached to the front and back sides of each battery cell of the battery string assembly in the thickness direction of the battery cell.

[0024] According to an embodiment of the second aspect of the utility model, a photovoltaic module is proposed, comprising: a battery string module according to an embodiment of the utility model; a front packaging film and a front cover plate, the front packaging film and the front cover plate are arranged in sequence along a direction away from the front of the battery string module; and a back packaging film and a back cover plate, the back packaging film and the back cover plate are arranged in sequence along a direction away from the back of the battery string module.

[0025] The photovoltaic assembly according to the embodiment of the utility model has the advantages of good fixation of interconnected structural parts, high reliability of the battery string assembly, strong crack resistance, low cost, etc. by utilizing the battery string assembly according to the embodiment of the utility model.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 It is a schematic diagram of a process in the manufacturing process of a photovoltaic module according to an embodiment of the utility model, wherein the positional relationship between the battery cells, the interconnection structure and the pads in the battery string assembly is shown;

[0029] Figure 2 It is a schematic diagram of the positional relationship of a battery cell, a pad, a secondary grid line and a grid line segment according to an embodiment of the utility model;

[0030] Figure 3 is another schematic diagram of a process in the manufacturing process of a photovoltaic module according to an embodiment of the utility model, wherein the positional relationship between the battery cells, the interconnection structure and the pads in the battery string assembly is shown;

[0031] Figure 4 yes Figure 1 A side view of the structure shown in;

[0032] Figure 5 is a schematic diagram of another process in the manufacturing process of a photovoltaic module according to an embodiment of the utility model, wherein an infrared lamp tube used in the process is shown;

[0033] Figure 6 is another schematic diagram of another process in the manufacturing process of the photovoltaic module according to the embodiment of the utility model, wherein the infrared lamp tube and the heat insulation board used in the process are shown;

[0034] Figure 7 is a schematic diagram of another process in the manufacturing process of the photovoltaic module according to the embodiment of the utility model, wherein the pressing needle and the pressing block used in the process are shown;

[0035] Figure 8 is a schematic diagram of a photovoltaic module according to an embodiment of the utility model, wherein an auxiliary film is shown;

[0036] Fig. 9 yes Figure 8 A side view of the structure shown in;

[0037] Fig.10 It is a schematic diagram of the remaining steps in the manufacturing process of the photovoltaic module according to the embodiment of the utility model, wherein a cross-sectional view of the photovoltaic module finally formed is shown.

[0038] Reference numerals:

[0039] Photovoltaic modules 1000,

[0040] Battery string assembly 100, front cover plate 200, front packaging film 300, back packaging film 400, back cover plate 500,

[0041] Battery cell 10, auxiliary grid line 101,

[0042] pad 20, first row of pads 201, second row of pads 202, first pad 2011, second pad 2022, infrared lamp 203, heat shield 2031, pressure pin 204, pressure block 205,

[0043] The gate line segment 30 , the interconnection structure 40 , and the auxiliary film 50 . DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0045] A battery string assembly 100 according to an embodiment of the first aspect of the present invention will be described below with reference to the accompanying drawings.

[0046] like Figure 1-Figure 9As shown, the battery string assembly 100 according to the embodiment of the present invention comprises a plurality of battery cells 10, a plurality of pads 20, a plurality of grid line segments 30 and a plurality of interconnection structures 40. It should be noted that the term "plurality" in the present invention refers to two or more than two.

[0047] A plurality of cells 10 are arranged in sequence along a first direction, and a plurality of secondary grid lines 101 are provided on the surface of each cell 10, and the plurality of secondary grid lines 101 extend continuously along a second direction perpendicular to the first direction and are spaced apart along the first direction. It should be noted that the cell 10 in the present invention may be a busbar-free cell, and the photovoltaic module 1000 may be a busbar-free heterojunction photovoltaic module.

[0048] A plurality of pads 20 are provided at both ends of the surface of each battery cell 10 in the first direction. In other words, no pads 20 are provided in the middle area of ​​the surface of each battery cell 10 in the first direction, but only at both ends in the first direction. Figure 1 For example, the first direction is Figure 1 The left and right directions shown in the figure, and the second direction is Figure 1 Therefore, the soldering pads 20 are only provided at the left and right ends of the above-mentioned surface of each battery cell 10. In this way, compared with the conventional technology in which the soldering pads are provided on the entire surface of the battery cell, the number of the soldering pads 20 of the utility model is greatly reduced, which significantly reduces the manufacturing cost of the battery string assembly.

[0049] A plurality of gate line segments 30 are located between the plurality of pads 20 at the two ends in the first direction, and the plurality of gate line segments 30 are spaced apart along the first direction and the second direction, and each gate line segment 30 extends along the second direction and covers a portion of the corresponding secondary gate line 101. Specifically, the plurality of gate line segments 30 are only arranged in the middle area of ​​the battery cell 10 in the first direction, but are not arranged at the two ends of the above-mentioned surface of each battery cell 10 in the first direction, and more specifically, are not arranged in the area of ​​the above-mentioned surface of each battery cell 10 that is located outside the pad 20 in the first direction. In addition, the plurality of gate line segments 30 are spaced apart along the first direction and the second direction, and each gate line segment 30 extends along the second direction and covers a portion of the corresponding secondary gate line 101. Figure 1-Figure 2 As shown, for example, a gate line segment 30 is arranged at a position of the secondary gate line 101 where gate drop may occur, and the gate line segment 30 covers the secondary gate line 101. In this way, even if the secondary gate line 101 drops gate at this position, the gate line segment 30 can replace the dropped gate portion to ensure that the entire secondary gate line 101 can still successfully guide the photocurrent.

[0050] like Figure 1-Figure 2As shown, each interconnection structure 40 extends along the first direction and two adjacent battery cells 10 are connected in series through a plurality of interconnection structures 40, wherein the interconnection structure 40 is connected to the side of the corresponding pads 20 located at both ends away from the battery cell 10 and connected to the corresponding grid line segment 30. Specifically, a plurality of battery cells 10 are connected in series through a plurality of interconnection structures 40, and the interconnection structure 40 is connected to the side of the pads 20 away from the battery cell 10 and connected to the corresponding grid line segment 30. With such an arrangement, regardless of whether the part where the secondary grid line 101 is connected to the grid line segment 30 has a grid drop, the interconnection structure 40 can be connected to the secondary grid line 101 through the grid line segment 30, so that the problem of poor connection between the interconnection structure 40 and the battery cell 10 can be avoided. For example, the interconnection structure 40 is a welding strip, and such a design can avoid the problem of poor welding or cold welding of the interconnection structure 40.

[0051] Thus, according to the battery string assembly 100 of the embodiment of the utility model, a plurality of welding pads 20 are arranged at both ends of the surface of each battery cell 10 in the first direction, a plurality of grid line segments 30 are located between the plurality of welding pads 20 at both ends in the first direction, and the plurality of grid line segments 30 are spaced apart along the first direction and the second direction, each grid line segment 30 extends along the second direction and covers a portion of the corresponding secondary grid line 101, each interconnecting structure 40 extends along the first direction and two adjacent battery cells 10 are connected in series through a plurality of interconnecting structures 40, the interconnecting structures 40 are connected to the side of the corresponding welding pads 20 located at both ends away from the battery cell 10 and connected to the corresponding grid line segments 30, it can be ensured that even if the secondary grid line 101 is off at this position, the grid line segment 30 can replace the off grid part to ensure that the entire secondary grid line 101 can still successfully guide the photocurrent, and the problem of poor welding or cold welding of the interconnecting structures 40 can be avoided, and the manufacturing cost of the battery string assembly can be significantly reduced.

[0052] According to some embodiments of the present invention, Figure 1-Figure 4 As shown, the plurality of pads 20 are divided into two columns of pads, the two columns of pads include a first column of pads 201 and a second column of pads 202, the first column of pads 201 and the second column of pads 202 are respectively located at two ends of the battery cell 10 along the first direction, the first column of pads 201 include a plurality of first pads 2011 arranged at intervals along the second direction, the second column of pads 202 include a plurality of second pads 2022 arranged at intervals along the second direction, and each interconnection structure 40 is connected to the corresponding first pad 2011 and second pad 2022. Compared with the traditional battery cell, this reduces the number of pads on the battery cell while also achieving a regular layout of the pads, and the layout of the entire battery cell is beautiful.

[0053] Furthermore, if Figure 1-Figure 2As shown, a plurality of first pads 2011 in the first column of pads 201 are arranged at uniform intervals in the second direction, and a plurality of second pads 2022 in the second column of pads 202 are arranged at uniform intervals in the second direction.

[0054] For example, Figure 1 and Figure 2 As shown, the first column of pads 201 may include ten first pads 2011 arranged at uniform intervals along the second direction, and the second column of pads 202 may include ten second pads 2022 arranged at uniform intervals along the second direction, and the position of the interconnection structure 40, such as the position of the welding strip, may be defined by the first pads 2011 and the second pads 2022. Thus, compared with the traditional battery cell, the number of columns of pads in the battery cell is reduced, thereby reducing the cost of the battery cell, and at the same time, the positioning of the interconnection structure 40 may be facilitated.

[0055] According to some embodiments of the present invention, Figure 2 As shown, a plurality of gate line segments 30 are arranged in a plurality of rows and columns, the plurality of rows of gate line segments 30 are spaced apart from each other along the second direction, and the plurality of columns of gate line segments 30 are spaced apart from each other along the first direction. The gate line segments 30 in each column are spaced apart from each other along the second direction, and respectively cover a portion of the same secondary gate line 101. Specifically, Figure 2 For example, a plurality of gate line segments 30 are arranged in an array of multiple rows and columns, and the gate line segments 30 in the same column cover a portion of the same secondary gate line 101 and are spaced apart along the second direction, for example, evenly spaced apart. Figure 2 , the gate line segments 30 in each row are spaced apart from each other along the first direction, and two pads 20 arranged opposite to each other in the first direction in the two columns of pads 20 are respectively located at the two ends of the corresponding row of gate line segments 30. Figure 2 For example, multiple gate line segments 30 in the same row are arranged at intervals along the first direction on different secondary gate lines 101, for example, evenly spaced, and the first pads 2011 in the first column of pads 201 and the second pads 2022 in the second column of pads 202 are located at both ends of each row of gate line segments 30. Such an arrangement can prevent the position of the interconnection structure 40 from changing, prevent the interconnection structure 40 from moving, and can also make the appearance of the battery cell 10 more regular, and improve the crack resistance of the battery string assembly 100.

[0056] According to some embodiments of the present invention, the distance between each solder pad 20 and the edge of one of the two ends of the battery cell 10 that is closer to the solder pad 20 is D, where D satisfies: 3mm≤D≤20mm. It is understandable that Figure 1As shown, the distance between each pad 20 and the near edge of the battery cell 10 is D. When D is less than 3 mm, each pad 20 is too close to the edge of the battery cell 10, which makes it difficult to install the pad 20 and it is relatively difficult to fix the position of the interconnection structure 40. When D is greater than 20 mm, each pad 20 is too far from the edge of the battery cell 10, resulting in a decrease in the number of interconnection structures 40 that can be installed, wasting space. Therefore, when D satisfies 3 mm ≤ D ≤ 20 mm, it can not only ensure that the installation operation of the pad 20 is convenient and the position of the interconnection structure 40 can be easily determined, but also the number of interconnection structures 40 can be guaranteed, and the space on the battery cell 10 can be fully utilized.

[0057] According to some embodiments of the present invention, the length of the gate line segment 30 in the second direction is greater than the width of the interconnection structure 40 in the second direction. In this way, the interconnection structure 40 can be more easily connected to the gate line segment 30, thereby reducing the positioning error of the interconnection structure 40.

[0058] Optionally, the length of the gate line segment 30 in the second direction is L, wherein L satisfies 0.2 mm≤L≤2 mm. If L<0.2 mm, the length of the gate line segment 30 is too short, which may result in failure to ensure accurate connection between the interconnection structure 40 and the gate line segment 30. If L>2 mm, the length of the gate line segment 30 is too long, resulting in waste of gate line material, and causing the surface of the battery cell 10 to be blocked too large, thereby reducing the photovoltaic efficiency of the battery cell 10. Therefore, when L satisfies 0.2 mm≤L≤2 mm, not only can the connection reliability between the interconnection structure 40 and the gate line segment 30 be ensured, but also the photovoltaic efficiency of the battery cell 10 can be guaranteed.

[0059] Optionally or additionally, the width of the gate line segment 30 in the first direction is W, wherein W satisfies 0.02 mm≤W≤0.5 mm. This arrangement can ensure that the width of the gate line segment 30 is appropriate, so that the gate line segment 30 is suitable for guiding the photocurrent.

[0060] Optionally, in some embodiments of the utility model, the width of the secondary grid line 101 in the first direction is between 10 μm and 40 μm, and the height in the third direction perpendicular to both the first direction and the second direction is between 5 μm and 15 μm. Such a configuration can better prevent the secondary grid line 101 from breaking, can effectively guide the current of the battery cell 10, and can reduce the shielding of the battery cell 10, ensure the photovoltaic efficiency of the battery cell, and at the same time ensure that the two adjacent battery cells 10 of the battery string assembly 100 can be reliably connected.

[0061] Optionally, the shape of the grid line segment 30 can be rectangular, rhombus or dumbbell, etc. In this way, the structure of the grid line segment 30 is regular, and the production of the grid line segment 30 is simplified. Of course, the utility model is not limited to this, and the grid line segment 30 can also be other shapes, which are not listed here one by one.

[0062] According to some embodiments of the present invention, the structures of the plurality of pads 20 are the same, the length of the pad 20 in the second direction is L1, and the width in the first direction is W1, wherein L1 and W1 respectively satisfy: 0.5mm≤L1≤2.0mm, 0.3mm≤W1≤2.0mm. For example, when L1<0.5mm or W1<0.3mm, the length of the pad 20 in the second direction or the width in the first direction is too small, and the solder may not be effectively gathered during welding, affecting the welding tension between the interconnection structure 104 and the battery cell 10; when L1>2.0mm or W1>2.0mm, the length of the pad 20 in the second direction or the width in the first direction is too large, which may result in a large shielding area for the battery cell 10, affecting the photovoltaic efficiency of the battery cell 10.

[0063] Specifically, the cross-sectional shape of the pad 20 can be a rectangle, a chamfered rectangle or a rounded rectangle. In this way, the structure of the pad 20 is regular, and the manufacture of the pad 20 is simplified. Of course, the utility model is not limited to this, and the pad 20 can also be other shapes, which are not listed here one by one.

[0064] According to some embodiments of the present invention, the interconnection structure 40 is connected to the center position of the pad 20 in the second direction and to the center position of the corresponding gate line segment 30 in the second direction. Such a configuration is not only conducive to the positioning of the interconnection structure 40, but also makes the appearance of the battery string assembly 100 more regular.

[0065] In addition, the surface of the battery cell 10 includes the front and back sides in the thickness direction of the battery cell 10, and the front and back sides are provided with a plurality of the above-mentioned secondary grid lines 101, a plurality of the above-mentioned pads 20, a plurality of the above-mentioned grid line segments 30 and a plurality of the above-mentioned interconnection structural members 40. Among them, the front side of the battery cell 10 is the main light-receiving surface of the battery cell 10, and the back side of the battery cell 10 is the side surface opposite to the front side of the battery cell 10. Optionally, the interconnection structural member 40 can be a welding strip, a part of the welding strip is connected to the welding pad 20 on the front side of one of the two adjacent battery cells 10, and the other part of the welding strip is connected to the welding pad 20 on the back side of the other of the two adjacent battery cells 10. By connecting a plurality of battery cells 10 with a plurality of interconnection structural members 40, a plurality of battery cells 10 can be connected into a complete battery string assembly 100. This connection is more convenient, convenient for operators to work, improves work efficiency, and also makes the battery string assembly 100 more beautiful and optimizes the appearance.

[0066] Optionally, the size of the battery cell 10 may be 156 mm-230 mm, and the thickness of the battery cell 10 may be 80 μm-150 μm. Optionally, 10 to 30 interconnecting structures 40 may be disposed on the front or back of each battery cell 10 .

[0067] Optionally, the number of the plurality of secondary grid lines 101 on the front side of the cell 10 is different from the number of the secondary grid lines 101 on the back side of the cell 10 .

[0068] However, the present invention is not limited thereto. The number of the plurality of secondary grid lines 101 on the front side of the cell 10 and the number of the secondary grid lines 101 on the back side of the cell 10 may also be the same.

[0069] Further, the number of the plurality of secondary grid lines 101 on the front side of the cell 10 is n1, and the number of the plurality of secondary grid lines 101 on the back side of the cell 10 is n2, wherein n1 and n2 respectively satisfy: 40≤n1≤400, 40≤n2≤400. When n1<40 or n2<40, the number of the secondary grid lines 101 on the front side or back side of the cell 10 is small, and it is impossible to ensure that the photocurrent of the cell 10 is guided out as completely as possible; when n1>400 or n2>400, the number of the secondary grid lines 101 on the front side or back side of the cell 10 is large, resulting in excessive shielding of the front side or back side of the cell 10, thereby reducing the light receiving area of ​​the cell 10, and further reducing the photovoltaic efficiency of the cell 10. Therefore, when 40≤n1≤400, 40≤n2≤400, it can ensure that the light receiving area of ​​the cell 10 is large, and it can ensure that the photocurrent of the cell 10 is guided out as completely as possible.

[0070] For example, the number of pads 20 on the front side of the cell 10 is twice the number of interconnection structures 40 on the front side of the cell 10, and the number of pads 20 on the back side of the cell 10 is twice the number of interconnection structures 40 on the back side of the cell 10. Figure 2As shown, on the front side of the battery cell 10, the plurality of pads 20 are divided into a first column of pads 201 and a second column of pads 202, and are respectively located at the two ends of the battery cell 10 along the first direction, and each interconnection structure 40 is connected to a first pad 2011 in the first column of pads 201 and another corresponding second pad 2022 in the second column of pads 20; on the back side of the battery cell 10 (not shown), the plurality of pads 20 are divided into a first column of pads 201 and a second column of pads 202, and are respectively located at the two ends of the battery cell 10 along the first direction, and each interconnection structure 40 is connected to a first pad 2011 in the first column of pads 201 and another corresponding second pad 2022 in the second column of pads 202 on the back side of the battery cell 10. That is, the two corresponding pads 20 can determine the position of the interconnection structure 40 on the front side or the back side of the battery cell 10.

[0071] According to some embodiments of the present invention, Figure 8 and Fig. 9 As shown, the battery string assembly 100 further includes an auxiliary film 50, wherein the auxiliary film 50 is disposed on a side of the plurality of interconnecting structures 40 away from the battery cell 10 and covers the plurality of interconnecting structures 40 and the plurality of pads 20, and the area of ​​the auxiliary film 50 is less than or equal to the area of ​​the battery cell 10. Specifically, the auxiliary film 50 is attached to the surface (e.g., the front and / or back) of each battery string assembly 100, and the auxiliary film 50 is disposed on a side of the plurality of interconnecting structures 40 on the surface away from the battery cell 10, and the auxiliary film 50 covers the plurality of interconnecting structures 40 and the plurality of pads 20 on the surface. With such arrangement, the fixing force between all interconnecting structures 40 (including interconnecting structures 40 located at the edge, such as welding strips) on the surface of the battery cell 10 and the battery cell 10 is improved, and all interconnecting structures 40 (including interconnecting structures 40 located at the edge, such as welding strips) can be prevented from shifting after lamination, especially preventing all interconnecting structures 40 (including interconnecting structures 40 located at the edge, such as welding strips) from being separated from the battery cell 10, thereby ensuring the reliability of the entire battery string assembly 100. At the same time, the area of ​​the auxiliary film 50 is less than or equal to the area of ​​the surface of the battery cell 10. With such arrangement, the waste of the auxiliary film 105 can be avoided, and the cost of the battery cell 100 can be reduced.

[0072] For example, the length of the auxiliary film 50 in the second direction is less than or equal to the length of the battery cell 10 in the second direction, and the width of the auxiliary film 50 in the first direction is less than or equal to the width of the battery cell 10 in the first direction.

[0073] According to one embodiment of the utility model, Figure 8As shown, the length of the auxiliary film 50 in the second direction is smaller than the length of the battery cell 10 in the second direction, and the width of the auxiliary film 50 in the first direction is smaller than the width of the battery cell 10 in the first direction.

[0074] According to another embodiment of the present invention, not shown in the figure, the length of the auxiliary film 50 in the second direction is equal to the length of the battery cell 10 in the second direction, and the width of the auxiliary film 50 in the first direction is equal to the width of the battery cell 10 in the first direction.

[0075] According to another embodiment of the present invention, not shown in the figure, the length of the auxiliary film 50 in the second direction is less than the length of the battery cell 10 in the second direction, and the width of the auxiliary film 50 in the first direction is equal to the width of the battery cell 10 in the first direction.

[0076] According to another embodiment of the present invention, not shown in the figure, the length of the auxiliary film 50 in the second direction is equal to the length of the battery cell 10 in the second direction, and the width of the auxiliary film 50 in the first direction is less than the width of the battery cell 10 in the first direction.

[0077] According to some embodiments of the utility model, each battery cell 10 of the battery string assembly 100 is provided with an auxiliary film 50 on the front and back sides in the thickness direction of the battery cell 10. For example, the auxiliary film 50 can cover the front and back sides of the battery cell 10, and the number of the auxiliary films 50 is twice the number of the battery cells 10. In this way, the interconnection structure 40 and the pad 20 on the front and back sides of the battery cell 10 can be simultaneously limited, and all the interconnection structures 40 on the front and back sides of the battery cell 10 (including the interconnection structures 40 located at the edge, such as welding strips) can be prevented from being detached from the battery cell 10, thereby further ensuring the reliability of the entire battery string assembly 100 and further improving the crack resistance of the battery string assembly 100.

[0078] The photovoltaic module 1000 according to the embodiment of the second aspect of the utility model comprises a battery string assembly 100, a front packaging film 300 and a front cover plate 200, a back packaging film 400 and a back cover plate 500. The battery string assembly 100 is the battery string assembly 100 proposed in any embodiment of the first aspect of the utility model, the front packaging film 300 and the front cover plate 200 are sequentially arranged in a direction away from the front of the battery string assembly 100, and the back packaging film 400 and the back cover plate 500 are sequentially arranged in a direction away from the back of the battery string assembly 100.

[0079] For example, Fig.10As shown, the front encapsulation film 300 and the front cover plate 200 are located on the side closer to the front of the battery assembly 100 in the thickness direction of the battery string assembly 100, and the front encapsulation film 300 is located between the front cover plate 200 and the battery string assembly 100. The back encapsulation film 400 and the back cover plate 500 are located on the side closer to the back of the battery assembly 100 in the thickness direction of the battery string assembly 100, and the back encapsulation film 400 is located between the back cover plate 500 and the battery string assembly 100. That is, along the direction from the front cover plate 200 to the back cover plate 500, the photovoltaic assembly 1000 may include the front cover plate 200, the front encapsulation film 300, the battery string assembly 100, the back encapsulation film 400 and the back cover plate 500 in sequence. Optionally, the front cover plate 200 may be a glass member, and the back cover plate 500 may be a glass member or a back plate.

[0080] The following is a specific example to illustrate a method for manufacturing a photovoltaic module 1000 according to a specific embodiment of the present invention. Specifically, the manufacturing method may include the following steps:

[0081] The first step, reference Figure 1 and Figure 4 , the interconnection structure 40, such as the welding strip, is placed at the corresponding positions on the front and back of the battery cell 10, wherein the interconnection structure 40 is connected to the grid line segment 30 and the corresponding pad 20, for example, connected to the center position of the corresponding pad 20. In this way, it is possible to prevent the welding strip from directly contacting the secondary grid line 101 and causing the grid to break during the welding process.

[0082] In the second step, the cell 10 with the interconnection structure 40 placed thereon is transferred to the infrared lamp tube 203. The plurality of infrared lamp tubes 203 are respectively located above each pad 20. Figure 5 and Figure 6 As shown. In addition, a heatable base plate may be provided under each soldering pad 20. By heating the infrared lamp tube 203, the soldering pad 20 and the interconnection structure 40 are welded together. Heat insulation plates 2031 may also be provided on both sides of the infrared lamp tube 203 to prevent the heat of the infrared lamp tube 203 from overflowing, thereby preventing the interconnection structure 40, such as the soldering pad and the secondary grid line 101 from forming an alloy with a weaker alloy strength, thereby preventing the alloy from being separated during the subsequent typesetting / handling process, that is, preventing the soldering pad 20 from being separated from the interconnection structure 40, causing a cold solder joint, and then preventing the displacement of the interconnection structure 40. In the utility model, the interconnection structure 40 may be, for example, a low-temperature solder strip. Since the melting point of the tin material is between 110°C and 160°C, the use of low-temperature tin material during the lamination process is more convenient for the conduction of current.

[0083] Step 3: Reference Figure 7-Figure 9, the auxiliary film 50 is cut into suitable sizes and placed on the front and back of the battery cell 10 respectively, the auxiliary film 50 placed on the front is fixed using a pressing block 205 with a pressing needle 204, and the auxiliary film 50 placed on the back is fixed by a bottom plate with adsorption, wherein the cut auxiliary film 50 covers all interconnection structures (including the interconnection structures located at the edge in the second direction) and all pads (including the pads located at both ends in the second direction). The characteristics of the auxiliary film 50 can refer to the characteristics of the auxiliary film 50 in any embodiment according to the first aspect of the utility model, and will not be repeated here.

[0084] In the fourth step, the plurality of battery cells 10 with the auxiliary films 50 and the pressing blocks are fixed together and welded into a battery string assembly 100 by infrared heating or hot air heating.

[0085] Step 5, Reference Fig.10 After the front cover 200, the front packaging film 300, the battery string assembly 100, the back packaging film 400 and the back cover 500 are placed in sequence, they are packaged into a photovoltaic assembly 1000 through lamination, and the front packaging film 300 and the back packaging film 400 are cross-linked and cured to protect the battery string assembly 100, and finally a five-layer structure, namely the front cover 200, the front packaging film 300, the battery string assembly 100, the back packaging film 400 and the back cover 500, is firmly bonded.

[0086] Other structures and operations of the photovoltaic assembly 1000 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0087] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0088] In the description of the present invention, "plurality" means two or more.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0090] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery string assembly (100), characterized in that: include: A plurality of battery cells (10), the plurality of battery cells (10) being arranged in sequence along a first direction, a plurality of secondary grid lines (101) being provided on a surface of each of the battery cells (10), the plurality of secondary grid lines (101) extending continuously along a second direction perpendicular to the first direction and spaced apart along the first direction; A plurality of solder pads (20), the plurality of solder pads (20) being arranged at two ends of the surface of each of the battery cells (10) in the first direction; a plurality of gate line segments (30), the plurality of gate line segments (30) being located between the plurality of pads (20) at the two ends in the first direction, the plurality of gate line segments (30) being spaced apart along the first direction and the second direction, and each of the gate line segments (30) extending along the second direction and covering a portion of a corresponding secondary gate line (101); as well as A plurality of interconnecting structures (40), each of the interconnecting structures (40) extending along the first direction and two adjacent battery cells (10) being connected in series via the plurality of interconnecting structures (40), wherein the interconnecting structures (40) are connected to a side of the corresponding solder pads (20) located at the two ends, away from the battery cell (10), and are connected to the corresponding gate line segments (30).

2. The battery string assembly (100) according to claim 1, characterized in that: The plurality of solder pads (20) are divided into two columns of solder pads (20), the two columns of solder pads (20) comprising a first column of solder pads (201) and a second column of solder pads (202), the first column of solder pads (201) and the second column of solder pads (202) being respectively located at two ends of the battery cell (10) along the first direction, the first column of solder pads (201) comprising a plurality of first solder pads (2011) arranged at intervals along the second direction, the second column of solder pads (202) comprising a plurality of second solder pads (2022) arranged at intervals along the second direction, and each of the interconnection structural members (40) is connected to the corresponding first solder pad (2011) and the second solder pad (2022).

3. The battery string assembly (100) according to claim 2, characterized in that: The plurality of gate line segments (30) are arranged in a plurality of rows and columns, the plurality of rows of gate line segments (30) are spaced apart from each other along the second direction, and the plurality of columns of gate line segments (30) are spaced apart from each other along the first direction, wherein: The gate line segments (30) in each column are spaced apart from each other along the second direction, and respectively cover a portion of the same secondary gate line (101); and The gate line segments (30) in each row are spaced apart from each other along the first direction, and two pads (20) in the two columns of pads (20) that are arranged opposite to each other in the first direction are respectively located at two ends of a corresponding row of gate line segments (30).

4. The battery string assembly (100) according to claim 1, characterized in that: The distance between each of the solder pads (20) and the edge of one of the two ends of the battery cell (10) that is closer to the solder pad (20) is D, where D satisfies: 3 mm ≤ D ≤ 20 mm.

5. The battery string assembly (100) according to claim 1, characterized in that: The length of the gate line segment (30) in the second direction is greater than the width of the interconnection structure (40) in the second direction.

6. The battery string assembly (100) according to claim 1, characterized in that: The length of the gate line segment (30) in the second direction is L, wherein L satisfies 0.2 mm≤L≤2 mm.

7. The battery string assembly (100) according to claim 1, characterized in that: The width of the gate line segment (30) in the first direction is W, wherein W satisfies 0.02 mm≤W≤0.5 mm.

8. The battery string assembly (100) according to claim 1, characterized in that: The grid line segment (30) is in the shape of a rectangle, a rhombus or a dumbbell.

9. The battery string assembly (100) according to claim 1, characterized in that: The plurality of solder pads (20) have the same structure, the length of the solder pad (20) in the second direction is L1, and the width of the solder pad (20) in the first direction is W1, wherein L1 and W1 respectively satisfy: 0.5 mm ≤ L1 ≤ 2.0 mm, 0.3 mm ≤ W1 ≤ 2.0 mm.

10. The battery string assembly (100) according to claim 9, characterized in that: The cross-sectional shape of the pad (20) is a rectangle, a chamfered rectangle or a rounded rectangle.

11. The battery string assembly (100) according to claim 1, characterized in that: The interconnection structure (40) is connected to the center position of the pad (20) in the second direction and to the center position of the corresponding gate line segment (30) in the second direction.

12. The battery string assembly (100) according to claim 1, characterized in that: The surface comprises a front side and a back side in the thickness direction of the battery cell (10), and the front side and the back side are both provided with the plurality of secondary grid lines (101), the plurality of welding pads (20), the plurality of grid line segments (30) and the plurality of interconnection structural members (40).

13. The battery string assembly (100) according to claim 12, characterized in that: The number of the plurality of auxiliary grid lines (101) on the front side is different from the number of the auxiliary grid lines (101) on the back side.

14. The battery string assembly (100) according to claim 13, characterized in that: The number of the plurality of secondary grid lines (101) on the front side is n1, and the number of the plurality of secondary grid lines (101) on the back side is n2, wherein n1 and n2 respectively satisfy: 40≤n1≤400, 40≤n2≤400.

15. The battery string assembly (100) according to claim 12, characterized in that: The number of pads (20) on the front surface is twice the number of interconnection structures (40) on the front surface; and The number of pads (20) on the back side is twice the number of interconnection structures (40) on the back side.

16. The battery string assembly (100) according to any one of claims 1 to 15, characterized in that: Also includes: An auxiliary film (50), the auxiliary film (50) being arranged on a side of the plurality of interconnecting structural members (40) away from the battery cell (10) and covering the plurality of interconnecting structural members (40) and the plurality of solder pads (20), the area of ​​the auxiliary film (50) being less than or equal to the area of ​​the battery cell (10).

17. The battery string assembly (100) according to claim 16, characterized in that: The length of the auxiliary film (50) in the second direction is less than or equal to the length of the battery cell (10) in the second direction, and the width of the auxiliary film (50) in the first direction is less than or equal to the width of the battery cell (10) in the first direction.

18. The battery string assembly (100) according to claim 16, characterized in that: The auxiliary film (50) is attached to the front and back sides of each battery cell (10) of the battery string assembly (100) in the thickness direction of the battery cell (10).

19. A photovoltaic module (1000), characterized in that: include: A battery string assembly (100), wherein the battery string assembly (100) is a battery string assembly (100) according to any one of claims 1 to 18; A front packaging adhesive film (300) and a front cover plate (200), wherein the front packaging adhesive film (300) and the front cover plate (200) are arranged in sequence in a direction away from the front of the battery string assembly (100); and A back packaging adhesive film (400) and a back cover plate (500), wherein the back packaging adhesive film (400) and the back cover plate (500) are arranged in sequence along a direction away from the back side of the battery string assembly (100).

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