Photovoltaic module and electric connection structure

Abstract

The utility model discloses a photovoltaic assembly and an electric connection structure. The photovoltaic module comprises a plurality of battery strings, wherein each battery string comprises a plurality of battery pieces and a plurality of electric connection units; each electric connection unit is used for connecting fine grid lines of two adjacent battery pieces in series; the electric connection unit comprises a plurality of first conductive bands which are arranged side by side at intervals and a second conductive band which is connected with the plurality of first conductive bands in series, and the plurality of first conductive bands are in one-to-one correspondence with the fine grid lines on one main surface of the battery piece; the extension direction of each first conductive band is consistent with the extension direction of the fine grid lines, and each first conductive band covers and is connected in series with two corresponding fine grid lines on two adjacent battery pieces; the second conductive bands are arranged at the ends of the first conductive bands in the extending direction, and the second conductive bands and the first conductive bands are of an integrated structure so that the distances between the first conductive bands can be fixed. According to the photovoltaic module, the current transmission loss can be reduced, so that the performance of the photovoltaic module is effectively improved.

Description

Technical Field

[0001] The utility model relates to a photovoltaic component and an electrical connection structure. Background Art

[0002] Currently, adjacent solar cells in a photovoltaic module are typically connected in series via multiple welding ribbons. Each ribbon is connected to a main grid line perpendicular to the grid lines, or the ribbons are directly connected to multiple grid lines perpendicular to the grid lines. This existing structure requires alignment of the ribbons, and during the transmission of the grid lines, the current must travel a certain distance before reaching the ribbons. This inevitably results in current transmission losses, which affect the performance of the photovoltaic module. Utility Model Content

[0003] In light of this, the present invention provides a photovoltaic module and electrical connection structure that can reduce current transmission losses, effectively improving the performance of the photovoltaic module. Furthermore, the second conductive ribbon in the electrical connection unit of the photovoltaic module is integrally formed with the plurality of first conductive ribbons, and the second conductive ribbon stabilizes the spacing between the plurality of first conductive ribbons, facilitating the alignment of the electrical connection unit with the solar cell, simplifying the photovoltaic module structure and simplifying the manufacturing process of the photovoltaic module.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a photovoltaic assembly comprising: a plurality of battery strings, wherein:

[0006] The battery string includes: a plurality of battery cells and a plurality of electrical connection units;

[0007] Each of the electrical connection units is used to connect in series the fine grid lines of two adjacent battery cells;

[0008] The electrical connection unit includes: a plurality of first conductive strips arranged side by side and at intervals, and a second conductive strip connected in series with the plurality of first conductive strips, wherein:

[0009] The plurality of first conductive strips correspond one-to-one to the fine grid lines on one main surface of the solar cell;

[0010] The extension direction of each of the first conductive strips is consistent with the extension direction of the thin grid lines, and each of the first conductive strips covers and connects in series two corresponding thin grid lines on two adjacent battery cells;

[0011] The second conductive strip is disposed at the end of the plurality of first conductive strips in the extending direction and is an integral structure with the plurality of first conductive strips to fix the spacing between the plurality of first conductive strips.

[0012] In a second aspect, an embodiment of the present invention provides an electrical connection structure applied to a photovoltaic module, comprising: a plurality of electrical connection units, wherein:

[0013] The plurality of electrical connection units are arranged along a first direction and are an integrated structure;

[0014] Each of the electrical connection units is used to connect two adjacent cells in the photovoltaic module in series;

[0015] The electrical connection unit includes: a plurality of first conductive strips arranged side by side and at intervals, and a second conductive strip connected in series with the plurality of first conductive strips, wherein:

[0016] The plurality of first conductive strips correspond one-to-one to the fine grid lines on the cell sheet of the photovoltaic module;

[0017] The extending direction of each first conductive strip is consistent with the extending direction of the fine gate line, wherein the extending direction of the first conductive strip is consistent with the first direction;

[0018] The two second conductive strips are respectively arranged at two ends of the plurality of first conductive strips and are integrated with the plurality of first conductive strips to fix the intervals between the plurality of first conductive strips.

[0019] The technical solution of the first aspect of the above utility model has the following advantages or beneficial effects:

[0020] The photovoltaic module provided by the embodiment of the present invention directly contacts the fine grid lines through the first conductive strip, extracting the current of the fine grid lines, and balancing the current of each first conductive strip through the second conductive strip. This omits the main grid lines and the welding strips formed parallel to the main grid lines, providing a photovoltaic module with a new structure, while also reducing the current transmission path, reducing current loss, and effectively improving the performance of the photovoltaic module. In addition, the second conductive strip balances the current transmitted by each first conductive strip, ensuring that the current transmitted by each cell in the photovoltaic module is balanced and stable, thereby further improving the performance of the photovoltaic module.

[0021] In addition, since the second conductive tape and the multiple first conductive tapes are an integrated structure and the second conductive tape fixes the spacing between the multiple first conductive tapes, the multiple first conductive tapes can be aligned with their corresponding fine grid lines at the same time through one positioning, without the need to align each first conductive tape individually, thereby simplifying the photovoltaic module manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a partial structural diagram of a first structure of a battery string in a photovoltaic assembly according to an embodiment of the present utility model;

[0023] Figure 2This is a partial structural diagram of a second structure of a battery string in a photovoltaic assembly according to an embodiment of the present utility model;

[0024] Figure 3 According to the embodiment of the present invention, the application Figure 2 A schematic diagram of a portion of the structure of an electrical connection unit in a battery string shown;

[0025] Figure 4 is a schematic diagram of a partial cross-sectional structure of a photovoltaic module parallel to the fine grid lines according to an embodiment of the present utility model;

[0026] Figure 5 (A) is a schematic side view of the electrical connection structure according to an embodiment of the present invention, and (B) is a schematic plan view of the unfolded electrical connection structure according to an embodiment of the present invention;

[0027] Figure 6 This is a structural diagram of an electrical connection unit in an electrical connection structure according to an embodiment of the present utility model;

[0028] Figure 7 is another structural schematic diagram of an electrical connection unit in an electrical connection structure according to an embodiment of the present utility model;

[0029] Figure 8 According to the embodiment of the present utility model, Figure 7 Schematic diagram of the deformed structure of the electrical connection unit;

[0030] Figure 9 1 is a schematic diagram of a first cross-sectional structure of a first conductive tape according to an embodiment of the present utility model;

[0031] Figure 10 1 is a schematic diagram of a second cross-sectional structure of the first conductive tape according to an embodiment of the present invention;

[0032] Figure 11 This is a partial schematic diagram of the structural changes during the laying of a battery string in a photovoltaic module according to an embodiment of the present utility model;

[0033] Figure 12 This is a partial structural diagram of a structure for fixing cells in a cell string in a photovoltaic module according to an embodiment of the present utility model;

[0034] Figure 13 This is a partial structural diagram of another structure for fixing cells in a cell string in a photovoltaic module according to an embodiment of the present utility model;

[0035] Figure 14 It is a schematic diagram of the main process of the photovoltaic module preparation method according to an embodiment of the present utility model.

[0036] The reference numerals are as follows:

[0037] 10-battery string; 11-battery cell; 111-fine grid line; 12-electrical connection unit; 121-first conductive tape; 122-second conductive tape; 123-third conductive tape; 124-welding layer; 125-cutting portion; 126-cutting position; 20-cover plate; 30-packaging layer; 40-back plate; 50-bonding point; 60-fixing film; 70-electrical connection structure. DETAILED DESCRIPTION

[0038] The photovoltaic modules involved in the embodiments of the present invention may be any type of photovoltaic modules, such as double-glass modules, single-glass modules, etc. The cells used in the photovoltaic modules may be cut from any solar cell without a busbar (such as a silicon-based solar cell, a perovskite solar cell, etc., wherein the silicon-based solar cell may be of an interdigitated type, a back contact type, or a type with electrodes on both sides).

[0039] The embodiment of the present invention improves the structure of the photovoltaic module by omitting the main grid line and directly connecting the solar cells in series with the thin grid lines 111 through the second conductive ribbon 122 and multiple first conductive ribbons 121 of the integral structure, wherein the first conductive ribbon 121 corresponds to the thin grid lines 111 one-to-one, and no soldering strips are required. On the one hand, the second conductive ribbon 122 defines the spacing between each two adjacent first conductive ribbons 121 in the multiple first conductive ribbons 121, that is, the presence of the second conductive ribbon 122 allows for simultaneous positioning of multiple first conductive ribbons 121 through a single positioning operation, simplifying the process operation of the photovoltaic module; on the other hand, by omitting the main grid line and soldering strips, the production cost of the photovoltaic module can be effectively reduced. In addition, the second conductive ribbon 122 is an integral structure with the multiple first conductive ribbons 121, and the second conductive ribbon 122 is arranged at the end of the extension direction of the multiple first conductive ribbons 121, so that the second conductive ribbon 122 can balance the current and power of the solar cells. Moreover, the photovoltaic module omits the main grid line and soldering strips, reducing the shading area of ​​the photovoltaic module, which can effectively improve the performance of the photovoltaic module.

[0040] in, Figure 1 This is a schematic diagram of the first structure of a battery string in a photovoltaic assembly provided by an embodiment of the present utility model; Figure 2 This is a second structural diagram of a battery string in a photovoltaic assembly provided by an embodiment of the present utility model; Figure 3 According to the embodiment of the present invention, the application Figure 2 A schematic structural diagram of an electrical connection unit in a battery string shown; Figure 4 It is a schematic diagram of the cross-sectional structure of the photovoltaic module provided by an embodiment of the present utility model parallel to the fine grid lines.

[0041] The present invention provides a photovoltaic module. Figure 4 As shown, the photovoltaic assembly may include: a plurality of battery strings 10, wherein:

[0042] like Figure 1 、 Figure 2 and Figure 4 As shown, the battery string 10 may include: a plurality of battery cells 11 and a plurality of electrical connection units 12;

[0043] Each electrical connection unit 12 is used to connect the fine grid lines 111 of two adjacent battery cells 11 in series;

[0044] The electrical connection unit 12 may include: a plurality of first conductive strips 121 arranged side by side and spaced apart, and a second conductive strip 122 connected in series with the plurality of first conductive strips 121 , wherein:

[0045] The plurality of first conductive strips 121 correspond one-to-one to the fine grid lines 111 on one main surface of the solar cell 11;

[0046] The extension direction of each first conductive strip 121 is consistent with the extension direction of the thin grid lines 111, and each first conductive strip 121 covers and connects in series two corresponding thin grid lines on two adjacent battery cells 11;

[0047] The second conductive strips 122 are disposed at ends of the first conductive strips 121 in the extending direction and are integrated with the first conductive strips 121 to fix the spacing between the first conductive strips 121 .

[0048] The plurality of first conductive strips 121 and second conductive strips 122 of the integrated structure are formed by punching a conductive plate through a stamping process.

[0049] Understandably, if Figure 4 As shown, in addition to the above-mentioned cell string 10, the photovoltaic module provided by the embodiment of the present invention may further include a cover plate 20, an encapsulation layer 30, and a back plate 40, wherein the encapsulation layer 30 is used to encapsulate the cell string between the cover plate 20 and the back plate 40. A photovoltaic module may include multiple cell strings 10, which are connected in series and parallel to form a cell array. Figure 4 Based on the partial structure of the photovoltaic module and the partial structure of the battery string provided by the embodiment of the present invention, those skilled in the art can understand the complete structure of the photovoltaic module provided by the embodiment of the present invention.

[0050] The photovoltaic module provided by the embodiment of the present invention generally has electrodes of the cell 11 without main grid lines, but only fine grid lines 111 .

[0051] In the integrated electrical connection unit 12, the plurality of first conductive strips 121 intersect with the second conductive strips 122. Preferably, the plurality of first conductive strips 121 and the second conductive strips 122 are perpendicular to each other. Specifically, the extension direction of the plurality of first conductive strips 121 is perpendicular to the extension direction of the second conductive strips 122. Based on this, the second conductive strips 122 are electrically connected to the same type of fine grid lines 111 on the cell to balance the current transmitted by each fine grid line 111, thereby ensuring the current transmission capacity of the cell.

[0052] Each first conductive tape 121 is connected to two opposite thin grid lines 111 on two adjacent battery cells 11 by welding or bonding.

[0053] Among them, the two corresponding fine grid lines on two adjacent battery cells 11 generally refer to two fine grid lines with opposite electrical properties and close distances on the two adjacent battery cells. For example, for a structure in which both the N-type structure and the P-type structure are arranged on the back of the battery cell 11, the fine grid line 111 on the N-type structure on one battery cell 11 and the fine grid line 111 on the P-type structure on another adjacent battery cell that is closest to it. For the N-type structure and the P-type structure are arranged on the two main surfaces of the battery cell 11, specifically, the fine grid line 111 on the first main surface (such as the main surface with the N-type structure) of one battery cell 11 and the second main surface (such as the main surface with the P-type structure) of another adjacent battery cell 11 are the fine grid line 111 that is closest to the fine grid line 111 on the first main surface (such as the main surface with the N-type structure).

[0054] The number of the second conductive strips 122 can be one or two. Specifically, when the number of the second conductive strips 122 is one, the second conductive strip 122 is provided on one side of a battery cell 11. Figure 1 As shown, in the case where there are two second conductive strips 122 , the two second conductive strips 122 are respectively disposed on two sides of two adjacent battery cells 11 that are furthest apart from each other.

[0055] The spacing between each two adjacent first conductive strips 121 is equal to the spacing between two fine grid lines 111 of the same type on one main surface of the battery cell 11. For example, for a structure in which fine grid lines 111 of the same type are arranged on one main surface of the battery cell 11, the spacing between two fine grid lines 111 of the same type is the spacing between two adjacent fine grid lines 111. For a structure in which an N-type structure and a P-type structure are alternately arranged on one main surface of the battery cell 11, the spacing between two fine grid lines 111 of the same type is the spacing between the fine grid lines 111 on two adjacent N-type structures and the spacing between the fine grid lines 111 on two adjacent P-type structures.

[0056] Furthermore, if Figure 9 and Figure 10 As shown, the cross section of the first conductive strip 121 may be circular, semicircular, inverted triangular, inverted trapezoidal or rectangular. Figure 10 As shown, the same first conductive tape 121 can be divided into two parts, and the cross sections of the two parts correspond to different structures, so as to meet the user's needs for different first conductive tapes 121 .

[0057] In addition, the cross section of the second conductive strip 122 may also be circular, semicircular, inverted triangular, inverted trapezoidal, or rectangular.

[0058] Furthermore, the thickness of the first conductive tape 121 can be 50 μm to 300 μm. For example, the thickness of the first conductive tape 121 can be 50 μm, 70 μm, 80 μm, 90 μm, 100 μm, 120 μm, 140 μm, 150 μm, 170 μm, 180 μm, 200 μm, 220 μm, 240 μm, 250 μm, 270 μm, 290 μm, or 300 μm. By limiting the thickness of the first conductive tape 121, the conductivity of the first conductive tape 121 can be guaranteed, and a stable connection structure can be formed between the first conductive tape 121 and the fine grid lines 111. It is worth noting that the thickness of the first conductive tape 121 refers to the length of the first conductive tape 121 in the thickness direction of the photovoltaic module. For example, if the cross-section of the first conductive tape 121 is a circle, the thickness of the first conductive tape 121 is the diameter of the circle; if the cross-section of the first conductive tape 121 is a semicircle, the thickness of the first conductive tape 121 is the radius of the circle; if the cross-section of the first conductive tape 121 is an inverted triangle or an inverted trapezoid, the thickness of the first conductive tape 121 is the height of the triangle or the inverted trapezoid.

[0059] Furthermore, the thickness of the second conductive tape 122 can be 50 μm to 300 μm. For example, the thickness of the second conductive tape 122 can be 50 μm, 60 μm, 70 μm, 90 μm, 100 μm, 120 μm, 135 μm, 140 μm, 150 μm, 170 μm, 180 μm, 200 μm, 220 μm, 240 μm, 250 μm, 270 μm, 290 μm or 300 μm. By limiting the thickness of the second conductive tape 122, the conductivity of the second conductive tape 122 can be guaranteed, and the second conductive tape 122 can be guaranteed to have a relatively strong tensile force, thereby stably limiting the first conductive tape 121. The thickness of the second conductive tape 122 can be the same as the thickness of the first conductive tape 121, or the thickness of the second conductive tape 122 can be greater than the thickness of the first conductive tape 121. It is worth noting that the thickness of the second conductive ribbon 122 refers to the length of the second conductive ribbon 122 in the thickness direction of the photovoltaic module. For example, if the cross-section of the second conductive ribbon 122 is circular, the thickness of the second conductive ribbon 122 is the diameter of the circle; if the cross-section of the second conductive ribbon 122 is semicircular, the thickness of the second conductive ribbon 122 is the radius of the circle; if the cross-section of the second conductive ribbon 122 is an inverted triangle or an inverted trapezoid, the thickness of the second conductive ribbon 122 is the height of the triangle or inverted trapezoid.

[0060] The first conductive strips 121 and the second conductive strips 122 can be formed of a copper-based material such as phosphor bronze, beryllium bronze, or oxygen-free copper. More specifically, the first conductive strips 121 and the second conductive strips 122 of the integrated structure are formed by stamping a conductive sheet material, so that the first conductive strips 121 and the second conductive strips 122 form a complete integrated structure.

[0061] The photovoltaic module provided in the embodiment of the present invention directly contacts the fine grid lines 111 through the first conductive strip 121, extracting the current of the fine grid lines 111, and balancing the current of each first conductive strip 121 through the second conductive strip 122. The main grid lines and the welding strips formed parallel to the main grid lines are omitted, providing a photovoltaic module with a new structure. At the same time, it can reduce the current transmission path, reduce current loss, and effectively improve the performance of the photovoltaic module. In addition, the current transmitted by each first conductive strip 121 is balanced by the second conductive strip 122, ensuring that the current transmitted by each cell 11 in the photovoltaic module is balanced and stable, thereby further improving the performance of the photovoltaic module.

[0062] In addition, since the second conductive tape 122 and the multiple first conductive tapes 121 are an integrated structure and the second conductive tape 122 fixes the spacing between the multiple first conductive tapes 121, the multiple first conductive tapes 121 and their corresponding fine grid lines 111 can be aligned simultaneously through one positioning, without the need to align each first conductive tape 121 individually, thereby simplifying the photovoltaic module manufacturing process.

[0063] Furthermore, if Figure 2 and Figure 3 As shown, the electrical connection unit 12 further includes: at least one third conductive tape 123, wherein the third conductive tape 123 is disposed between the two second conductive tapes 122, and the third conductive tape 123 intersects with the plurality of first conductive tapes 121 and forms an integral structure with the plurality of first conductive tapes 121. Figure 2 and Figure 3 As shown, the extension direction of the third conductive ribbon 123 is perpendicular to the extension direction of the first conductive ribbon 121. By intersecting the third conductive ribbon 123 with the multiple first conductive ribbons 121, the third conductive ribbon 123 cooperates with the second conductive ribbon 122, improving the positioning and fixation capabilities of the multiple first conductive ribbons 121. This makes it easier to synchronize and align the multiple first conductive ribbons 121 with their corresponding fine grid lines 111, improving the operability of the photovoltaic module production process. Furthermore, the third conductive ribbon 123 is electrically connected to the same type of fine grid lines 111 on the cell to further ensure uniform current distribution on each fine grid line 111 on the cell, which helps to further improve the performance of the photovoltaic module.

[0064] More specifically, if Figure 2 and Figure 3 As shown, for a structure in which the electrical connection unit 12 includes at least one third conductive strip 123, one possible structure is: at least one third conductive strip 123 is parallel to the second conductive strip 122. Preferably, if there are multiple third conductive strips 123, the multiple third conductive strips 123 are evenly spaced in the extending direction of the first conductive strip 121. By having at least one third conductive strip 123 parallel to the second conductive strip 122, the electrical connection unit 12 is easily manufactured.

[0065] Furthermore, if Figure 4 As shown, the electrical connection unit 12 may further include a welding layer 124, wherein the welding layer 124 is wrapped around the first conductive strip 121 and the second conductive strip 122. The welding layer improves the welding tension between the first conductive strip 121 and the second conductive strip 122 and the fine grid line 111.

[0066] More specifically, the thickness of the soldering layer 124 can be 5 μm to 25 μm. For example, the thickness of the soldering layer 124 is 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, 23 μm, or 25 μm. The thickness of the soldering layer 124 can ensure the soldering tension between the first and second conductive strips 121 and 122 and the fine grid lines 111, and minimize the consumption of the soldering layer 124 material. The soldering layer can be made of any of tin, tin-lead, tin-lead-bismuth, tin-bismuth-silver, and tin-silver-copper.

[0067] Two preparation processes are possible for the solder layer 124. Specifically, the first preparation process for the solder layer 124 involves unfolding the electrical connection unit 12 and sequentially performing a degreasing process, water washing, pickling, water washing, electroplating, water washing, and drying process. The second preparation process for the solder layer 124 involves unfolding the electrical connection unit 12 and sequentially performing an annealing process, a surface pre-flux coating process, and a hot-dip plating process. The parameters used in each process step can be determined based on experimental data.

[0068] Furthermore, if Figure 12 As shown, the photovoltaic module may further include: bonding points 50 spaced apart on the fine grid lines 11 , and the first conductive tape 121 may be further stabilized by the bonding points 50 .

[0069] Furthermore, if Figure 13 As shown, the photovoltaic assembly may further include: a fixing film 60 covering the electrical connection unit 12 , and the first conductive tape 121 may be further stabilized by the fixing film 60 .

[0070] Furthermore, the embodiment of the present invention provides an electrical connection structure, which is applied to photovoltaic modules. Specifically, Figure 5 (A) and Figure 5 As shown in (B), the electrical connection structure may include: a plurality of electrical connection units 12, wherein the plurality of electrical connection units 12 are arranged along a first direction and the plurality of electrical connection units 12 are an integrated structure. Figure 5 As shown in (A), the electrical connection structure is generally placed in a crimped manner.

[0071] like Figure 1 and Figure 2 As shown, each electrical connection unit 12 is used to connect two adjacent cells 11 in series in a photovoltaic module;

[0072] More specifically, if Figure 1 、 Figure 2 Figure 3 、 Figure 5 (B) and Figures 6 to 8 As shown, the electrical connection unit 12 may include: a plurality of first conductive tapes 121 arranged side by side and at intervals and a second conductive tape 122 connected in series with the plurality of first conductive tapes 121, the plurality of first conductive tapes 121 corresponding one-to-one to the fine grid lines 111 on the cell 11 of the photovoltaic module; the extension direction of each first conductive tape 121 is consistent with the extension direction of the fine grid line 111, wherein the extension direction of the first conductive tape 121 is consistent with the first direction; two second conductive tapes 122 are respectively arranged at both ends of the plurality of first conductive tapes 121, and are an integral structure with the plurality of first conductive tapes 121 to fix the spacing between the plurality of first conductive tapes 121.

[0073] The plurality of first conductive strips 121 correspond one-to-one to the fine grid lines 111 on one main surface of the solar cell 11 .

[0074] The electrical connection unit 12 in the electrical connection structure provided by the embodiment of the present invention directly contacts the fine grid lines 111 through the first conductive strip 121, conducts the current of the fine grid lines 111, and balances the current of each first conductive strip 121 through the second conductive strip 122, omitting the main grid line and the welding strip formed with the main grid line, providing a photovoltaic module with a new structure, while reducing the current transmission path, reducing current loss, and effectively improving the performance of the photovoltaic module. In addition, the current transmitted by each first conductive strip 121 is balanced by the second conductive strip 122, ensuring that the current transmitted by each cell 11 in the photovoltaic module is balanced and stable, thereby further improving the performance of the photovoltaic module.

[0075] In addition, since the electrical connection unit 12 in the electrical connection structure is an integrated structure with the multiple first conductive tapes 121 through the second conductive tape 122 and the second conductive tape 122 fixes the spacing between the multiple first conductive tapes 121, the multiple first conductive tapes 121 and their corresponding fine grid lines 111 can be aligned at the same time through one positioning, without the need to align each first conductive tape 121 individually, thereby simplifying the photovoltaic module manufacturing process.

[0076] The integrated structure of the plurality of electrical connection units 12 in the electrical connection structure can be formed by stamping a conductive plate through a stamping process to ensure the integrated structure of the plurality of electrical connection units 12. The conductive plate can be phosphor bronze, beryllium bronze, or oxygen-free copper.

[0077] Furthermore, if Figure 5 As shown, each electrical connection unit 12 includes two second conductive strips 122, which are disposed at both ends of the plurality of first conductive strips 121. A cutting portion 125 is provided between two adjacent second conductive strips 122 belonging to two electrical connection units 12. The cutting portion 125 is used to indicate and locate the cutting position of two adjacent electrical connection units 12. By cutting the electrical connection structure at the cutting portion 125, each electrical connection unit 12 can be formed into an independent entity. Each electrical connection unit 12, as an independent entity, connects two adjacent battery cells 11 in series.

[0078] The cutting portion 125 is provided to facilitate positioning of the cutting position, so that the cut electrical connection units 12 are identical, thus meeting the requirements for connecting the battery cells in series.

[0079] Furthermore, for each electrical connection unit 12, there are two arrangements of the first conductive strips 121. Specifically, the first arrangement of the first conductive strips 121 is: Figures 1 to 3 、 Figure 5 (B) and Figure 6 As shown, multiple first conductive strips 121 are in the second direction (perpendicular to the first direction) (i.e., in the arrangement direction of multiple first conductive strips 121), and each fine grid line first conductive strip 121 can correspond to each fine grid line 111 on a main surface of the same battery cell 11.

[0080] The second arrangement of the first conductive strips 121 is as follows: Figure 7 and Figure 8 As shown, the first conductive strips 121 on odd-numbered positions correspond one-to-one with the fine grid lines 111 on one main surface of the cell 11; the first conductive strips 121 on even-numbered positions correspond one-to-one with the fine grid lines 111 on the other main surface of the cell 11. This structure can further reduce material waste during the formation of the electrical connection structure, thereby lowering the manufacturing cost of the electrical connection structure.

[0081] Regardless of the first arrangement of the first conductive strips 121 or the second arrangement of the first conductive strips 121, as Figures 1 to 3 、 Figure 5 (B) and Figures 6 to 8 As shown, in each electrical connection unit 12, a second conductive strip 122 is provided at both ends of a plurality of first conductive strips 121. More specifically, for the second arrangement of the first conductive strips 121, as shown in FIG. Figure 7 As shown, a cutting position 126 is provided between the first conductive ribbon 121 on the odd-numbered positions and the second conductive ribbon 122 connected at one end; a cutting position 126 is provided between the first conductive ribbon 121 on the even-numbered positions and the second conductive ribbon 122 connected at the other end. By cutting at the cutting position 126, the first conductive ribbon 121 on the odd-numbered positions and the second conductive ribbon 122 connected at the other end form an electrical connection unit 12, and the first conductive ribbon 121 on the even-numbered positions and the second conductive ribbon 122 connected at one end form an electrical connection unit 12. The provision of the cutting position 126 facilitates cutting two independent electrical connection units 12 from the electrical connection unit 12.

[0082] Furthermore, if Figure 2 、 Figure 3 and Figure 6 As shown, the electrical connection structure may also include: at least one third conductive tape 123, wherein the third conductive tape 123 is arranged between the two second conductive tapes 122, and the third conductive tape 123 intersects with the multiple first conductive tapes 121, and forms an integrated structure with the multiple first conductive tapes 121; through the cooperation between the third conductive tape 123 and the second conductive tape 122, the spacing between the first conductive tapes 121 is further improved and stabilized, so as to further facilitate the synchronous positioning of each first conductive tape 121, and can further balance the current transmission on the battery cell.

[0083] Preferably, at least one third conductive strip 123 is parallel to the second conductive strip 122 to simplify the fabrication process of the electrical connection structure. More preferably, in the case where there are multiple third conductive strips 123, the multiple third conductive strips 123 are evenly spaced in the direction in which the first conductive strip 121 extends.

[0084] Furthermore, if Figure 4 As shown, the electrical connection unit 12 also includes: a welding layer 124, wherein the welding layer 124 is wrapped around the periphery of the first conductive tape 121 and the second conductive tape 122. The welding layer is used to increase the welding tension between the first conductive tape 121 and the second conductive tape 122 and the fine grid line 111. The thickness of the welding layer 124 may be 5μm to 25μm. For example, the thickness of the welding layer 124 is 5μm, 8μm, 10μm, 12μm, 15μm, 18μm, 20μm, 22μm, 23μm or 25μm, etc. The thickness of the welding layer 124 can further ensure the welding tension between the first conductive tape 121 and the second conductive tape 122 and the fine grid line 111, and minimize the consumption of the welding layer 124 material. The welding layer may be any one of tin, tin-lead, tin-lead-bismuth, tin-bismuth-silver, and tin-silver-copper.

[0085] Two preparation processes are possible for the solder layer 124. Specifically, the first preparation process for the solder layer 124 involves unfolding the electrical connection unit 12 and sequentially performing a degreasing process, water washing, pickling, water washing, electroplating, water washing, and drying process. The second preparation process for the solder layer 124 involves unfolding the electrical connection unit 12 and sequentially performing an annealing process, a surface pre-flux coating process, and a hot-dip plating process. The parameters used in each process step can be determined based on experimental data.

[0086] Furthermore, the present invention provides a method for preparing a photovoltaic module. Figure 14 As shown, the method for preparing the photovoltaic module may include:

[0087] Step S1401: alternately laying electrical connection units 12 and battery cells 11 to obtain a battery string, wherein each two adjacent battery cells 11 are connected to an electrical connection unit 12, wherein each fine grid line 111 on the battery cell 11 is placed corresponding to a first conductive tape 121 of the electrical connection unit 12;

[0088] Specifically, Figure 5 The rolled electrical connection structure of (A) is unfolded, and then the electrical connection unit 12 is cut out from the electrical connection structure, and Figure 11As shown, the electrical connection unit 12 is placed, and the battery cell 111 is covered on the electrical connection unit 12. Each first conductive strip 121 of the electrical connection unit 12 corresponds one-to-one to each fine grid line on one main surface of the battery cell 111. Each fine grid line on the main surface of the battery cell 111 is pressed against its corresponding first conductive strip 121, thereby pressing the battery cell 111. Because each first conductive strip 121 is connected by a second conductive strip 122, each first conductive strip 121 can be positioned as a whole in a single positioning operation. The electrical connection unit 12 is further placed on the battery cell 111. In a single positioning operation, each first conductive strip 121 on the electrical connection unit 12 is positioned to each fine grid line on the other main surface of the battery cell 111. Another battery cell 11 is further covered on the electrical connection unit 12. The electrical connection unit 12 and battery cells 11 are sequentially stacked, thereby completing the sequential laying of each battery cell 11 and electrical connection unit 12 of the battery string. Finally, the laid battery strings are sent to the string welding machine light box to be heated into strings and the welding is completed.

[0089] The laying process can be completed directly using existing procedures, and during the positioning process, only one positioning operation is required to complete the synchronous positioning of each first conductive tape 121, which effectively simplifies the process operation and improves the production efficiency and yield of photovoltaic modules.

[0090] Step S1402: Assembling a battery string.

[0091] The battery string assembly process can be directly completed using existing processes.

[0092] Compared with the existing method of positioning each soldering ribbon one by one, in the preparation method provided by the embodiment of the present invention, multiple first conductive ribbons 121 can be positioned on the solar cell 11 through one positioning, thereby effectively improving the production efficiency of photovoltaic modules.

[0093] The electrical connection structure and photovoltaic module manufacturing process provided by the embodiments of the present invention are described in detail below with reference to several embodiments.

[0094] Example 1

[0095] The copper strip is made into Figure 5 The structure shown in (B) is then prepared with a tin layer on its surface by electroplating. The electroplating process is as follows: coil unwinding - degreasing - water washing - pickling - water washing - tinning - water washing - drying - coiling.

[0096] like Figure 11 As shown, the electrical connection unit 12 is connected from Figure 5The material roll (A) is cut into sheets - swing the electrical connection unit 12 - position the electrical connection unit 12 relative to the battery cell - place the battery cell to press the electrical connection unit 12 - position the electrical connection unit 12 relative to the battery cell - discharge the connection unit 12 - release the pressure needle row to press the battery and the electrical connection unit 12 - position the electrical connection unit 12 relative to the battery cell - place the battery cell to press the electrical connection unit 12. After continuous arrangement in this way, it is sent to the string welding machine light box for heating into a string to complete the welding.

[0097] Example 2

[0098] The whole process is similar to that of Example 1, except that the structure of the electrical connection unit 12 prepared in this embodiment is as follows: Figure 3 A third conductive tape 123 is set between the two second conductive tapes 122. On the one hand, it ensures the flatness between different welding tapes so that they will not warp or deform during the stamping, electroplating, and winding processes, and is easier to fit with the battery surface during the battery string welding and laying process; on the other hand, it can better balance the current transmission between the grid lines, reduce current loss, and increase power generation.

[0099] Example 3

[0100] The preparation process is similar to that of Example 1, except that Figure 7 Before applying the structure shown in FIG. 1 to a photovoltaic module, the electrical connection unit 12 is punched and divided into pieces at the cutting position 126 to obtain the following pieces: Figure 8 The structure shown in Figure 8 The structure shown forms two electrical connection units 12. This structure can save copper material. The two sets of electrical connection units 12 can be stamped together. Before welding, the electrical connection units 12 can be separated into two pieces by a secondary punching method. In this way, two sets of electrical connection units 12 can be punched out with the same copper strip width, reducing material consumption and effectively lowering the production cost of the electrical connection structure and photovoltaic module.

[0101] In summary, the embodiments of the present invention provide the following technical solutions:

[0102] Technical Solution 1: A photovoltaic module comprising: a plurality of battery strings 10, wherein:

[0103] The battery string 10 includes: a plurality of battery cells 11 and a plurality of electrical connection units 12;

[0104] Each of the electrical connection units 12 is used to connect in series the fine grid lines 111 of two adjacent battery cells 11;

[0105] The electrical connection unit 12 includes: a plurality of first conductive strips 121 arranged side by side and spaced apart, and a second conductive strip 122 connected in series with the plurality of first conductive strips 121 , wherein:

[0106] The plurality of first conductive strips 121 correspond one-to-one to the fine grid lines 111 on one main surface of the solar cell 11;

[0107] The extension direction of each first conductive strip 121 is consistent with the extension direction of the thin grid lines 111, and each first conductive strip 121 covers and connects in series two corresponding thin grid lines on two adjacent battery cells 11;

[0108] The second conductive strips 122 are disposed at ends of the first conductive strips 121 in the extending direction and are integrated with the first conductive strips 121 to fix the spacing between the first conductive strips 121 .

[0109] Technical Solution 2: According to the photovoltaic module of Technical Solution 1, the electrical connection unit 12 further includes: at least one third conductive tape 123, wherein:

[0110] The third conductive strip 123 is disposed between two of the second conductive strips 122 , and the third conductive strip 123 intersects with the first conductive strips 121 and forms an integral structure with the first conductive strips 121 .

[0111] Technical Solution 3: The photovoltaic module according to Technical Solution 2,

[0112] At least one third conductive strip 123 is parallel to the second conductive strip 122;

[0113] Preferably, in the case where there are multiple third conductive strips 123 , the multiple third conductive strips 123 are distributed at equal intervals in the extending direction of the first conductive strip 121 .

[0114] Technical Solution 4: The photovoltaic module according to Technical Solution 1,

[0115] The first conductive strips 121 and the second conductive strips 122 of the integrated structure are formed by stamping a conductive plate through a stamping process;

[0116] and / or,

[0117] The plurality of first conductive strips 121 are perpendicular to the second conductive strips 122 .

[0118] Technical Solution 5: According to the photovoltaic module of Technical Solution 1 or 4, the electrical connection unit 12 further includes: a welding layer 124, wherein:

[0119] The welding layer 124 is wrapped around the first conductive tape 121 and the second conductive tape 122 .

[0120] Technical Solution 6: A photovoltaic module according to any one of Technical Solutions 1 to 4,

[0121] The thickness of the first conductive tape 121 is 50 μm to 300 μm;

[0122] and / or,

[0123] The thickness of the second conductive tape 122 is 50 μm to 300 μm;

[0124] and / or,

[0125] The cross section of the first conductive strip 121 is circular, semicircular, inverted triangular, or inverted trapezoidal;

[0126] and / or,

[0127] The cross section of the second conductive strip 122 is circular, semicircular, inverted triangular, or inverted trapezoidal.

[0128] Technical Solution 7: The photovoltaic module according to Technical Solution 5,

[0129] The thickness of the welding layer 124 is 5 μm to 25 μm.

[0130] Technical Solution 8: An electrical connection structure, applied to a photovoltaic module, comprising: a plurality of electrical connection units 12, wherein:

[0131] The plurality of electrical connection units 12 are arranged along a first direction and are an integrated structure;

[0132] Each of the electrical connection units 12 is used to connect two adjacent cells 11 in the photovoltaic module in series;

[0133] The electrical connection unit 12 includes: a plurality of first conductive strips 121 arranged side by side and spaced apart, and a second conductive strip 122 connected in series with the plurality of first conductive strips 121 , wherein:

[0134] The plurality of first conductive strips 121 correspond one-to-one to the fine grid lines 111 on the solar cells 11 of the photovoltaic module;

[0135] The extending direction of each first conductive strip 121 is consistent with the extending direction of the fine gate line 111 , wherein the extending direction of the first conductive strip 121 is consistent with the first direction;

[0136] The two second conductive strips 122 are respectively disposed at two ends of the first conductive strips 121 and are integrated with the first conductive strips 121 to fix the intervals between the first conductive strips 121 .

[0137] Technical Solution 9: The electrical connection structure according to Technical Solution 8,

[0138] For the case where each of the electrical connection units 12 includes two second conductive strips 122,

[0139] The two second conductive strips 122 are respectively provided at two ends of the plurality of first conductive strips 121;

[0140] A cutting portion 125 is provided between two adjacent second conductive strips 122 belonging to two of the electrical connection units 12 , wherein:

[0141] The cutting portion 125 is used to indicate and locate the cutting position of two adjacent electrical connection units 12 .

[0142] Technical solution 10: The electrical connection structure according to technical solution 8,

[0143] The plurality of first conductive strips 121 correspond one-to-one to the fine grid lines 111 on one main surface of the solar cell 11 .

[0144] Technical Solution 11: The electrical connection structure according to Technical Solution 8,

[0145] In the arrangement direction of the plurality of first conductive strips 121 , the first conductive strips 121 at odd positions correspond one-to-one to the fine grid lines 111 on one main surface of the battery cell 11 ; the first conductive strips 121 at even positions correspond one-to-one to the fine grid lines 111 on the other main surface of the battery cell 11 .

[0146] Technical Solution 12: The electrical connection structure according to Technical Solution 11,

[0147] In each of the electrical connection units 12 , the second conductive strips 122 are provided at both ends of the plurality of first conductive strips 121 ;

[0148] A cutting position 126 is provided between the first conductive strip 121 on the odd-numbered position and the second conductive strip 122 connected at one end;

[0149] A cutting position 126 is provided between the first conductive tape 121 on the even-numbered position and the second conductive tape 122 connected to the other end, so that by cutting at the cutting position 126, the first conductive tape 121 on the odd-numbered position and the second conductive tape 122 connected to the other end thereof form an electrical connection unit 12, and the first conductive tape 121 on the even-numbered position and the second conductive tape 122 connected to one end thereof form an electrical connection unit 12.

[0150] Technical Solution 13: The electrical connection structure according to Technical Solution 10 further includes: at least one third conductive tape 123, wherein:

[0151] The third conductive strip 123 is disposed between two of the second conductive strips 122 , and the third conductive strip 123 intersects with the plurality of first conductive strips 121 and forms an integral structure with the plurality of first conductive strips 121 ;

[0152] Preferably, at least one third conductive strip 123 is parallel to the second conductive strip 122;

[0153] Preferably, in the case where there are multiple third conductive strips 123 , the multiple third conductive strips 123 are distributed at equal intervals in the extending direction of the first conductive strip 121 .

[0154] Technical Solution 14: The electrical connection structure according to any one of Technical Solutions 7 to 13,

[0155] The integrated structure of the plurality of electrical connection units 12 is formed by punching a conductive plate through a stamping process;

[0156] and / or,

[0157] The electrical connection unit 12 further includes a welding layer 124, wherein:

[0158] The welding layer 124 is wrapped around the first conductive tape 121 and the second conductive tape 122 .

[0159] Technical Solution 15: A method for preparing a photovoltaic module according to any one of Technical Solutions 1 to 6, comprising:

[0160] Step 1: alternately laying electrical connection units 12 and battery cells 11 to obtain a battery string, wherein each two adjacent battery cells 11 are connected to one electrical connection unit 12, and each fine grid line 111 on the battery cell 11 is placed corresponding to a first conductive tape 121 of the electrical connection unit 12;

[0161] Step 2: Assemble the battery string.

[0162] The above steps are merely provided to help understand the method, structure, and core concept of the present invention. A person skilled in the art would be able to make improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications would also fall within the scope of protection of the claims of the present invention.

Claims

1. A photovoltaic module, characterized in that: include: A plurality of battery strings (10), wherein The battery string (10) comprises: a plurality of battery cells (11) and a plurality of electrical connection units (12); Each of the electrical connection units (12) is used to connect in series the fine grid lines (111) of two adjacent battery cells (11); The electrical connection unit (12) comprises: a plurality of first conductive strips (121) arranged side by side and at intervals, and a second conductive strip (122) connected in series with the plurality of first conductive strips (121), wherein: The plurality of first conductive strips (121) correspond one-to-one to the fine grid lines (111) on a main surface of the battery cell (11); The extension direction of each first conductive strip (121) is consistent with the extension direction of the thin grid lines (111), and each first conductive strip (121) covers and connects in series two corresponding thin grid lines on two adjacent battery cells (11); The second conductive strip (122) is arranged at the end of the plurality of first conductive strips (121) in the extending direction and forms an integral structure with the plurality of first conductive strips (121) to fix the spacing between the plurality of first conductive strips (121).

2. The photovoltaic module according to claim 1, characterized in that The electrical connection unit (12) further comprises: at least one third conductive strip (123), wherein: The third conductive strip (123) is arranged between two of the second conductive strips (122), and the third conductive strip (123) intersects with a plurality of the first conductive strips (121), and forms an integral structure with the plurality of the first conductive strips (121).

3. The photovoltaic module according to claim 2, characterized in that At least one third conductive strip (123) is parallel to the second conductive strip (122); Preferably, in the case where there are multiple third conductive strips (123), the multiple third conductive strips (123) are distributed at equal intervals in the extension direction of the first conductive strip (121).

4. The photovoltaic module according to claim 1, characterized in that The plurality of first conductive strips (121) and the second conductive strips (122) of an integrated structure are formed by punching a conductive plate through a stamping process; and / or, The plurality of first conductive strips (121) are perpendicular to the second conductive strips (122).

5. The photovoltaic module according to claim 1 or 4, characterized in that: The electrical connection unit (12) further includes: a welding layer (124), wherein: The welding layer (124) is wrapped around the outer periphery of the first conductive tape (121) and the second conductive tape (122).

6. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The thickness of the first conductive tape (121) is 50 μm to 300 μm; and / or, The thickness of the second conductive tape (122) is 50 μm to 300 μm; and / or, The cross section of the first conductive strip (121) is circular, semicircular, inverted triangular, or inverted trapezoidal; and / or, The cross section of the second conductive strip (122) is circular, semicircular, inverted triangular or inverted trapezoidal.

7. The photovoltaic module according to claim 5, characterized in that The thickness of the welding layer (124) is 5 μm to 25 μm.

8. An electrical connection structure, characterized in that: Applicable to a photovoltaic module, comprising: a plurality of electrical connection units (12), wherein: The plurality of electrical connection units (12) are arranged along a first direction and the plurality of electrical connection units (12) are an integrated structure; Each of the electrical connection units (12) is used to connect two adjacent solar cells (11) in series in the photovoltaic module; The electrical connection unit (12) comprises: a plurality of first conductive strips (121) arranged side by side and at intervals, and a second conductive strip (122) connected in series with the plurality of first conductive strips (121), wherein: The plurality of first conductive strips (121) correspond one-to-one to the fine grid lines (111) on the cell sheet (11) of the photovoltaic module; The extension direction of each first conductive strip (121) is consistent with the extension direction of the fine grid line (111), wherein the extension direction of the first conductive strip (121) is consistent with the first direction; The two second conductive strips (122) are respectively arranged at both ends of the plurality of first conductive strips (121) and form an integral structure with the plurality of first conductive strips (121) to fix the spacing between the plurality of first conductive strips (121).

9. The electrical connection structure according to claim 8, characterized in that: For the case where each of the electrical connection units (12) includes two second conductive strips (122), Two of the second conductive strips (122) are respectively arranged at two ends of the plurality of the first conductive strips (121); A cutting portion (125) is provided between two adjacent second conductive strips (122) belonging to two of the electrical connection units (12), wherein: The cutting portion (125) is used to indicate and locate the cutting positions of two adjacent electrical connection units (12).

10. The electrical connection structure according to claim 8, wherein: The plurality of first conductive strips (121) correspond one-to-one to the fine grid lines (111) on one main surface of the battery cell (11).

11. The electrical connection structure according to claim 8, wherein: In the arrangement direction of the plurality of first conductive strips (121), the first conductive strips (121) at odd positions correspond one-to-one to the fine grid lines (111) on one main surface of the battery cell (11); and the first conductive strips (121) at even positions correspond one-to-one to the fine grid lines (111) on the other main surface of the battery cell (11).

12. The electrical connection structure according to claim 11, wherein: In each of the electrical connection units (12), the second conductive strips (122) are provided at both ends of the plurality of first conductive strips (121); A cutting position (126) is provided between the first conductive strip (121) on the odd-numbered position and the second conductive strip (122) connected at one end; A cutting position (126) is provided between the first conductive tape (121) on the even-numbered position and the second conductive tape (122) connected to the other end thereof, so that by cutting at the cutting position (126), the first conductive tape (121) on the odd-numbered position and the second conductive tape (122) connected to the other end thereof form one electrical connection unit (12), and the first conductive tape (121) on the even-numbered position and the second conductive tape (122) connected to one end thereof form one electrical connection unit (12).

13. The electrical connection structure according to claim 10, wherein: Also includes: at least one third conductive strip (123), wherein The third conductive strip (123) is arranged between two of the second conductive strips (122), and the third conductive strip (123) intersects with a plurality of the first conductive strips (121), and forms an integral structure with the plurality of the first conductive strips (121).

14. The electrical connection structure according to claim 13, wherein: At least one of the third conductive strips (123) is parallel to the second conductive strip (122).

15. The electrical connection structure according to claim 13, wherein: In the case where there are multiple third conductive strips (123), the multiple third conductive strips (123) are distributed at equal intervals in the extending direction of the first conductive strip (121).

16. The electrical connection structure according to any one of claims 8 to 15, characterized in that: The electrical connection unit (12) further includes: a welding layer (124), wherein: The welding layer (124) is wrapped around the outer periphery of the first conductive tape (121) and the second conductive tape (122).

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