Battery piece, battery string, photovoltaic module and photovoltaic power generation system
By employing alternating first and second grid lines on photovoltaic cells and utilizing busbars to collect current, the problem of high current loss in traditional photovoltaic cells is solved, thereby improving the photoelectric conversion efficiency and performance of the cells.
Patent Information
- Application Number
- CN202422380407.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-09-29
AI Technical Summary
Traditional photovoltaic cells suffer from high current loss due to the sub-busbars, which reduces the efficiency of the cells and photovoltaic modules and makes it difficult to collect current, thus affecting performance.
The first and second bus lines are arranged alternately, and the current is collected through the first bus line and the second bus line, which avoids the loss of traditional sub-bus lines and simplifies the electrical connection between cells.
It improves the photoelectric conversion efficiency and performance of solar cells, reduces current loss, simplifies the electrical connection between solar cells, and enhances the reliability of the connection and production efficiency.
Smart Images
Figure CN223600263U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic technology field especially, is involved in a kind of cell piece, cell string, photovoltaic module and photovoltaic power generation system. BACKGROUND
[0002] In the related art, a plurality of main grid lines and a plurality of sub-grid lines are provided on the photovoltaic cell piece. The sub-grid lines are mainly used for collecting current, and the current collected by the sub-grid lines is collected to the main grid and then led out through the welding strip to realize the electrical connection between the cell pieces, thereby facilitating the use of the cell pieces. However, the conventional cell piece has the defect that the current loss is high when transmitted through the sub-grid lines, which can reduce the efficiency of the cell and the photovoltaic module. Moreover, when a plurality of cell pieces are connected, the current is not easy to collect, which reduces the use performance. SUMMARY
[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide a cell piece. The first bus bar and the second bus bar can collect the current on the plurality of first grid lines and the plurality of second grid lines, which is convenient to use and improves the use performance of the cell piece.
[0004] A second object of the utility model is to provide a cell string using the above-mentioned cell piece.
[0005] A third object of the utility model is to provide a photovoltaic module using the above-mentioned cell piece or cell string.
[0006] A fourth object of the utility model is to provide a photovoltaic power generation system using the above-mentioned cell piece, cell string or photovoltaic module.
[0007] A battery cell according to a first aspect of the present invention includes: a battery cell body; a plurality of first grid lines disposed on one side surface of the battery cell body, the plurality of first grid lines extending along a first direction, the plurality of first grid lines being spaced apart along a second direction, the second direction being perpendicular to the first direction, the first direction being the arrangement direction of the plurality of battery cells in a battery string; a plurality of second grid lines disposed on the one side surface of the battery cell body, the plurality of second grid lines extending along the first direction, the plurality of second grid lines and the plurality of first grid lines being alternately spaced apart along the second direction, the polarity of the second grid lines being opposite to that of the first grid lines, one end of the first grid line and the second grid line along the first direction being a first end, and the other end of the first grid line and the second grid line along the first direction being a second end; a first bus grid line connected to the first end of the plurality of first grid lines, the first bus grid line being spaced apart from the first end of the plurality of second grid lines; and a second bus grid line connected to the second end of the plurality of second grid lines along the first direction, the second bus grid line being spaced apart from the second end of the plurality of first grid lines.
[0008] According to the first aspect of the present invention, the solar cell, by providing multiple first and second grid lines, allows current to be conducted to conductive materials such as solder ribbons or conductive wires simply by passing through these lines. This avoids the losses that occur when current is transmitted along grid lines perpendicular to the first grid lines, thereby improving the photoelectric conversion efficiency of the solar cell and enhancing its performance. Furthermore, when multiple solar cells are connected, adjacent solar cells can be electrically connected via corresponding first and second bus grid lines, facilitating easy connection and use, and further improving the performance of the solar cell. Additionally, contact between the second grid line and the first bus grid line, as well as between the first and second bus grid lines, can be avoided, thus preventing short circuits.
[0009] According to some embodiments of the present invention, the first busbar extends along the second direction, the plurality of first busbars are parallel to each other, and the first busbar is perpendicular to the plurality of first busbars; the second busbar extends along the second direction, the plurality of second busbars are parallel to each other, and the second busbar is perpendicular to the plurality of second busbars.
[0010] According to some embodiments of the present invention, a plurality of first gate lines and a plurality of second gate lines are arranged at uniform intervals along the second direction.
[0011] According to some embodiments of the present application, the distance between the first gate line and the adjacent second gate line is d1, wherein the d1 satisfies: 0.3mm≤d1≤2mm.
[0012] According to some embodiments of the present application, the distance between the first bus gate line and the first end of the second gate line is d2, wherein the d2 satisfies: 0.3mm≤d2≤1mm; and / or, the distance between the second bus gate line and the second end of the first gate line is d3, wherein the d3 satisfies: 0.3mm≤d3≤1mm.
[0013] According to some embodiments of the present application, the width of the first bus gate line is greater than the width of the first gate line; and the width of the second bus gate line is greater than the width of the second gate line.
[0014] According to some embodiments of the present application, the two ends of the first direction of the plurality of first gate lines are flush respectively; and / or, the two ends of the first direction of the plurality of second gate lines are flush respectively.
[0015] According to the battery string of the second aspect of the present application, the battery string comprises: a plurality of battery pieces, the battery pieces are the battery pieces according to the first aspect of the present application, the plurality of battery pieces are arranged along a first direction, and two adjacent battery pieces are electrically connected.
[0016] According to some embodiments of the present application, the battery string further comprises: a plurality of first conductive connecting pieces, the plurality of first conductive connecting pieces are respectively electrically connected with a plurality of first gate lines of the battery pieces, and the other ends of the plurality of first conductive connecting pieces are spaced apart from the second bus gate line of the battery piece; a plurality of second conductive connecting pieces, the plurality of second conductive connecting pieces are respectively electrically connected with a plurality of second gate lines of the battery pieces, and the other ends of the plurality of second conductive connecting pieces are spaced apart from the first bus gate line.
[0017] According to some embodiments of the present application, the plurality of first conductive connecting pieces all extend along the first direction, and the plurality of first conductive connecting pieces respectively cover the plurality of first gate lines; the plurality of second conductive connecting pieces all extend along the first direction, and the plurality of second conductive connecting pieces respectively cover the plurality of second gate lines.
[0018] According to some embodiments of the present application, the length of the overlapping part of the first conductive connecting piece and the first busbar line is L1, the width of the first busbar line is W1, wherein the L1, W1 satisfy: 2W1 / 3≤L1≤W1; and / or, the length of the overlapping part of the second conductive connecting piece and the second busbar line is L2, the width of the second busbar line is W2, wherein the L2, W2 satisfy: 2W2 / 3≤L2≤W2.
[0019] According to some embodiments of the present application, the first conductive connecting piece is inwardly retracted at one end close to the first busbar line to the first end of the first busbar line, the distance between the one end of the first conductive connecting piece close to the first busbar line and the first end of the first busbar line is D1, wherein the D1 satisfies: 0.5mm≤D1≤1mm; and / or, the second conductive connecting piece is inwardly retracted at one end close to the second busbar line to the second end of the second busbar line, the distance between the one end of the second conductive connecting piece close to the second busbar line and the second end of the second busbar line is D2, wherein the D2 satisfies: 0.5mm≤D2≤1mm.
[0020] According to some embodiments of the present application, the battery string further comprises: at least one busbar, the first busbar line and the second busbar line of the adjacent two battery pieces are electrically connected through the busbar.
[0021] According to some embodiments of the present application, the width of the busbar in the second direction is greater than the width of the first conductive connecting piece, the width of the busbar in the second direction is greater than the width of the second conductive connecting piece, the width of the busbar in the second direction is less than the length of the first busbar line in the second direction, and the width of the busbar in the second direction is less than the length of the second busbar line in the second direction.
[0022] According to some embodiments of the present application, the busbar comprises: a conductive layer; a first soldering layer and a second soldering layer, the first soldering layer and the second soldering layer are arranged on the same side of the thickness direction of the conductive layer, and the first soldering layer and the second soldering layer are respectively soldered with the first busbar line and the second busbar line of the adjacent two battery pieces; a coating layer, the coating layer is located between the first soldering layer and the second soldering layer, and the coating layer is located at the gap between the adjacent two battery pieces.
[0023] According to some embodiments of the present application, the coating layer comprises at least one of a white coating layer and a black coating layer.
[0024] According to some embodiments of the present application, the thickness of the busbar is w, wherein the w satisfies: 0.1mm≤w≤0.3mm.
[0025] According to some embodiments of the present application, the bus bars are multiple, the multiple battery pieces are electrically connected through the multiple bus bars, the bus bars located at the edges of the battery string among the multiple bus bars have connecting portions, the connecting portions extend along a second direction, and the connecting portions are adapted to be electrically connected with adjacent battery strings.
[0026] According to the photovoltaic module of the third aspect of the present application, the battery piece is according to the battery piece of the first aspect of the present application, or the battery string is according to the battery string of the second aspect of the present application.
[0027] According to the photovoltaic power generation system of the fourth aspect of the present application, the battery piece is according to the battery piece of the first aspect of the present application, or the battery string is according to the battery string of the second aspect of the present application, or the photovoltaic module is according to the photovoltaic module of the third aspect of the present application.
[0028] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0029] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
[0030] Figure 1 is a schematic view of the back of the battery piece body of the battery piece according to the embodiments of the present application;
[0031] Figure 2 is a schematic view of the front of the battery piece body of the battery piece according to the embodiments of the present application;
[0032] Figure 3 is a schematic view of the battery piece according to the embodiments of the present application;
[0033] Figure 4 is a partial schematic view of the battery string according to the embodiments of the present application;
[0034] Figure 5 is a schematic view of the battery string according to the embodiments of the present application;
[0035] Figure 6 is a schematic view of the bus bar of the battery string according to the embodiments of the present application, wherein the coating layer is a black layer;
[0036] Figure 7 is a schematic view of the bus bar of the battery string according to the embodiments of the present application, wherein the coating layer is a white layer.
[0037] Reference signs:
[0038] 100, battery piece; 200, battery string;
[0039] 1, battery piece body; 2, first grid line; 3, second grid line;
[0040] 31, first end; 32, second end;
[0041] 4, first busbar grid line; 5, second busbar grid line;
[0042] 6, first conductive connecting piece; 7, second conductive connecting piece;
[0043] 8, busbar; 81, conductive layer; 82, first soldering aid layer; 83, second soldering aid layer;
[0044] 84, coating layer; 841, white coating layer; 842, black coating layer; 85, connecting part. DETAILED DESCRIPTION
[0045] The embodiments of the present application will be described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary, and the following description is made with reference to Figures 1-3 The battery piece 100 according to the first aspect of the present application is described below.
[0046] As shown in Figure 1 and Figure 3 , the battery piece 100 according to the first aspect of the present application comprises a battery piece body 1, a plurality of first grid lines 2, a plurality of second grid lines 3, a first busbar grid line 4, and a second busbar grid line 5.
[0047] Specifically, the plurality of first grid lines 2 are arranged on one side surface of the battery piece body 1, and each of the plurality of first grid lines 2 extends along a first direction (for example, the up-down direction in Figure 1 , the plurality of first grid lines 2 are arranged in the second direction (for example, the left-right direction in Figure 1 , the second direction is perpendicular to the first direction, and the first direction is the arrangement direction of the plurality of battery pieces 100 of the battery string 200 (i.e., the extension direction of the first conductive connecting piece 6 and the second conductive connecting piece 7 such as a solder strip). The plurality of second grid lines 3 are arranged on the above-mentioned one side surface of the battery piece body 1, and each of the plurality of second grid lines 3 extends along the first direction, and the plurality of second grid lines 3 and the plurality of first grid lines 2 are alternately and spacedly arranged in the second direction, the polarity of the second grid line 3 is opposite to that of the first grid line 2, and one end of the first grid line 2 and the second grid line 3 along the first direction is the first end 31, and the other end of the first grid line 2 and the second grid line 3 along the first direction is the second end 32.
[0048] For example, in Figure 1 and Figure 2In the example of FIG. 1, the plurality of first busbars 2 and the plurality of second busbars 3 are arranged on the back surface of the cell body 1, and the first busbars 2 and the second busbars 3 extend in the up-down direction, that is, the extension direction of the first busbars 2 and the second busbars 3 is the same as the arrangement direction of the plurality of cells 100 when the plurality of cells 100 are connected into the cell string 200. The plurality of first busbars 2 and the plurality of second busbars 3 are arranged alternately and spaced apart in the left-right direction. For example, when the first busbar 2 is a positive busbar, the second busbar 3 is a negative busbar. Similarly, when the first busbar 2 is a negative busbar, the second busbar 3 is a positive busbar. The extension direction of the cell string 200, that is, the arrangement direction of the plurality of cells 100, for example, Figure 1 the up-down direction in FIG. 1.
[0049] The extension direction of the first busbar 2 and the second busbar 3 in the present application is the same as the extension direction of the solder strip in the prior art. It can also be understood that the cell body 1 is only provided with the first busbar 2 and the second busbar 3 which have the same extension direction as the solder strip. In this way, compared with the prior art, the cell 100 only retains the first busbar 2 and the second busbar 3 made of a material having a conductive ability, and the current collection can be conducted to the solder strip or the conductive wire and other conductive materials through the busbar, avoiding the loss of current transmission in the auxiliary busbar. That is, the first busbar 2 and the second busbar 3 in the present application have the functions of collecting current and collecting current, and when the plurality of cells 100 are connected into the cell string 200, the electrical connection of the cell 100 can be realized through the electrical connection of the corresponding busbar of the plurality of cells 100, thereby improving the photoelectric conversion efficiency of the cell 100 and the cell string 200 and improving the use performance of the cell 100. Moreover, the number of busbars is reduced, the cell silver paste is low, and the cost is reduced.
[0050] For example, in the example of FIG. 1, Figure 1 and Figure 3 In the example of FIG. 1, the upper end of the first busbar 2 and the second busbar 3 is the first end 31, and the lower end of the first busbar 2 and the second busbar 3 is the second end 32. The distance between the first end 31 of the first busbar 2 and the upper side edge of the cell 100 is less than the distance between the first end 31 of the second busbar 3 and the upper side edge of the cell 100, and the distance between the second end 32 of the first busbar 2 and the lower side edge of the cell 100 is greater than the distance between the second end 32 of the second busbar 3 and the lower side edge of the cell 100. For example, the busbar material of the present application can use silver and other materials which are easy to sinter and conduct electricity, thereby achieving the effect of reducing silver. In this way, while ensuring the current collection ability of the first busbar 2 and the second busbar 3, the first busbar 2 and the second busbar 3 can be distinguished, thereby facilitating the connection of the plurality of cells 100, improving the connection accuracy and connection efficiency of the cell 100, and further improving the manufacturing efficiency of the cell string 200.
[0051] In combination with Figure 1 andFigure 3 The first busbar 4 is connected to the first end 31 of the plurality of first busbars 2. The first busbar 4 and the first end 31 of the plurality of second busbars 3 are spaced apart from each other. The second busbar 5 is connected to the second end 32 of the plurality of second busbars 3 along the first direction. The second busbar 5 and the second end 32 of the plurality of first busbars 2 are spaced apart from each other.
[0052] For example, in Figure 1 and Figure 3 In the example, the first busbar 4 is connected to the upper end of each of the first busbars 2, and the upper ends of the first busbar 4 are spaced apart from those of the plurality of second busbars 3. The second busbar 5 is located below the plurality of first busbars 2 and the plurality of second busbars 3, and the second busbar 5 is connected to the lower ends of each of the plurality of second busbars 3, and the lower ends of the second busbar 5 are spaced apart from those of the plurality of first busbars 2. With this configuration, the current collected by the plurality of first busbars 2 can flow to the first busbar 4, and the first busbar 4 can collect the current collected by the plurality of first busbars 2. Similarly, the current collected by the plurality of second busbars 3 can flow to the second busbar 5, and the second busbar 5 can collect the current collected by the plurality of second busbars 3, which is beneficial for the collection of current on the solar cell 100, thereby benefiting the use of the solar cell 100. When multiple solar cells 100 are connected, adjacent solar cells 100 can be electrically connected through corresponding first busbar 4 and second busbar 5, thus achieving electrical connection between adjacent solar cells 100. This connection is convenient, simple to use, and improves the performance of the solar cells 100. In addition, the current transmission path is shorter, and the electrical loss is smaller.
[0053] Furthermore, when the end of the first grid line 2 near the first busbar 4 breaks, the first grid line 2 connected to the first busbar 4 can conduct current through the first busbar 4. When the end of the second grid line 3 near the second busbar 5 breaks, the second grid line 3 connected to the second busbar 5 can output current through the second busbar 5, thereby reducing the current loss of the solar cell 100 and improving the reliability of the solar cell 100. In addition, the arrangement of the first grid line 2, the second grid line 3, the first busbar 4, and the second busbar 5 is reasonable and simple, which is more conducive to the use of the solar cell 100. Moreover, by setting the upper ends of the multiple second grid lines 3 to be spaced apart from the first busbar 4, and the lower ends of the multiple first grid lines 2 to be spaced apart from the second busbar 5, contact between the second grid lines 3 and the first busbar 4, as well as contact between the first grid lines 2 and the second busbar 5, can be avoided, thereby preventing short circuits. It should be noted that the battery cell 100 can be a back-contact battery cell 100. However, it is not limited to this.
[0054] According to the battery piece 100 of the first aspect of the present application, by arranging the first and second grid lines 2 and 3, the current collection can be conducted to the conductive material such as the solder strip or the conductive wire through the lines, avoiding the loss of the current transmission on the traditional grid line perpendicular to the first grid line 2, improving the photoelectric conversion efficiency of the battery piece 100, and improving the use performance of the battery piece 100. In addition, when the plurality of battery pieces 100 are connected, the adjacent two battery pieces 100 can be electrically connected through the corresponding first and second bus grid lines 4 and 5, so as to realize the electrical connection of the adjacent battery pieces 100, which is convenient to connect and simple to use, and improves the use performance of the battery piece 100. In addition, the contact between the second grid line 3 and the first bus grid line 4 can be avoided, and the contact between the first grid line 2 and the second bus grid line 5 can be avoided, so as to avoid short circuit.
[0055] According to some embodiments of the present application, in combination with Figure 1 and Figure 3 , the first bus grid line 4 extends along the second direction, the plurality of first grid lines 2 are parallel to each other, and the first bus grid line 4 is perpendicular to the plurality of first grid lines 2. The second bus grid line 5 extends along the second direction, the plurality of second grid lines 3 are parallel to each other, and the second bus grid line 5 is perpendicular to the plurality of second grid lines 3.
[0056] For example, in the examples of Figure 1 and Figure 3 , the first and second bus grid lines 4 and 5 respectively extend linearly along the left and right directions, the plurality of first grid lines 2 and the plurality of second grid lines are respectively arranged parallel to each other, and the first and second bus grid lines 4 and 5 are parallel to each other. By such arrangement, the contact between the first grid line 2 or the second grid line 3 and the adjacent grid line with opposite polarity after printing inclination can be avoided, that is, the first grid line 2 is not easy to contact with the second grid line 3, and the short circuit of the battery piece 100 is avoided. In addition, it can also be ensured that the first bus grid line 4 is spaced apart from the upper ends of the plurality of second grid lines 3, and the second bus grid line 5 is spaced apart from the lower ends of the plurality of first grid lines, thereby avoiding the false touch of the positive and negative grid lines, reducing the printing precision requirement of the grid lines on the battery piece 100, reducing the processing difficulty, improving the production efficiency and use reliability. In addition, the layout of the first grid line 2, the second grid line 3, the first bus grid line 4 and the second bus grid line 5 is reasonable, improves the surface utilization rate of the battery piece 100, and is also beneficial to the printing of the first grid line 2, the second grid line 3, the first bus grid line 4 and the second bus grid line 5.
[0057] According to some embodiments of the present application, in combination with Figure 1 and Figure 3 , the plurality of first grid lines 2 and the plurality of second grid lines 3 are uniformly spaced along the second direction. For example, in the drawings of Figure 1 and Figure 3In the example, the plurality of first grid lines 2 and the plurality of second grid lines 3 are arranged at equal intervals. In this way, the printing of the first grid lines 2 and the second grid lines 3 is facilitated, the printing difficulty of the first grid lines 2 and the second grid lines 3 is reduced, and the production efficiency of the battery piece 100 is improved. In addition, the appearance of the sub-grid lines of the battery piece 100 is more beautiful. In addition, it is also beneficial to arrange a larger number of first grid lines 2 and second grid lines 3 on the battery piece 100 to improve the surface utilization rate of the battery piece 100.
[0058] According to some embodiments of the present application, in combination with Figure 1 and Figure 3 , the interval between the first grid line 2 and the adjacent second grid 3 is d1, wherein d1 satisfies: 0.3mm≤d1≤2mm.
[0059] For example, the above-mentioned "interval d1" refers to the horizontal distance of the first grid line 2 and the adjacent second grid line in the left-right direction. When the interval between the first grid line 2 and the adjacent second grid 3 is less than 0.3mm, the distance between the grid lines of different polarities is small, and when the grid line printing is offset, the grid lines of different polarities are easy to contact and short-circuit, thereby improving the printing precision of the first grid line 2 and the second grid line 3. When the interval between the first grid line 2 and the adjacent second grid 3 is greater than 2mm, the number of grid lines arranged on the battery piece body 1 is reduced, and the utilization rate of the surface of the battery piece body 1 is reduced. Therefore, by setting the interval d1 between the first grid line 2 and the adjacent second grid 3 to satisfy 0.3mm≤d1≤2mm, the arrangement interval of the first grid line 2 and the second grid line 3 is reasonable, which is beneficial to the printing of the first grid line 2 and the second grid line 3, and also beneficial to the photoelectric conversion of the first grid line 2 and the second grid line 3, thereby improving the use performance of the battery piece 100.
[0060] According to some embodiments of the present application, the interval between the first bus grid line 4 and the first end 31 of the second grid line 3 is d2, wherein d2 satisfies: 0.3mm≤d2≤1mm. And / or, the interval between the second bus grid line 5 and the second end 32 of the first grid line 2 is d3, wherein d3 satisfies: 0.3mm≤d3≤1mm.
[0061] For example, the interval between the first busbar grid line 4 and the first end 31 of the second grid line 3 can be the same as or different from the interval between the second busbar grid line 5 and the second end 32 of the first grid line 2. In the following, the interval d2 between the first busbar grid line 4 and the first end 31 of the second grid line 3 is taken as an example. When the interval between the upper end of the second grid line 3 and the first busbar grid line 4 is less than 0.3 mm, the probability of the upper end of the second grid line 3 contacting the first busbar grid line 4 is increased, which is not conducive to the normal use of the battery piece 100. When the interval between the upper end of the second grid line 3 and the first busbar grid line 4 is greater than 1 mm, the distance is large, the length of the second grid line 3 is shortened, and the utilization rate of the surface of the battery piece body 1 is reduced. Therefore, by setting the interval d2 between the first busbar grid line 4 and the first end 31 of the second grid line 3 and the interval d3 between the second busbar grid line 5 and the second end 32 of the first grid line 2 to satisfy the above range respectively, the size is reasonably set, which is conducive to the photoelectric conversion of the first grid line 2 and the second grid line 3 at the same time, also reduces the precision requirement of grid line printing, and improves the electrical performance of the battery piece 100.
[0062] According to some embodiments of the present application, Figure 1 and Figure 3 , the width of the first busbar grid line 4 is greater than the width of the first grid line 2, and the width of the second busbar grid line 5 is greater than the width of the second grid line 3. Since the first busbar grid line 4 collects the current collected on the plurality of first grid lines 2, and the second busbar grid line 5 collects the current collected on the plurality of second grid lines 3, by setting the width of the first busbar grid line 4 to be greater than the width of the first grid line 2 and the width of the second busbar grid line 5 to be greater than the width of the second grid line 3, it is more conducive to the collection of current, and the impedance of the current on the first busbar grid line 4 and the second busbar grid line 5 can be reduced, thereby ensuring the reliability of the use of the battery piece 100.
[0063] According to some embodiments of the present application, Figure 4-7 and Figure 5 , the two ends of the first direction of the plurality of first grid lines 2 are flush respectively. And / or, the two ends of the first direction of the plurality of second grid lines 3 are flush respectively. That is, the upper end and the lower end of the plurality of first grid lines 2 are flush respectively, and the upper end and the lower end of the plurality of second grid lines 3 are flush respectively. By such setting, on the one hand, it is conducive to the printing of the first grid line 2 and the second grid line 3, and it is also conducive to the connection of the first grid line 2 and the first busbar grid line 4, and conducive to the connection of the second grid line 3 and the second busbar grid line 5. In addition, it can also effectively avoid the uneven ends of the first grid line 2 or the second grid line 3 from causing false contact with the corresponding first busbar grid line 4 and second busbar grid line 5. On the other hand, the first grid line 2 and the second grid line 3 are arranged in order, and the appearance is beautiful.
[0064] According to the battery string 200 of the second aspect of the present application, Figure 4The plurality of battery pieces 100 are arranged along a first direction, and two adjacent battery pieces 100 are electrically connected.
[0065] According to the battery string 200, the current loss on the battery piece 100 is reduced by using the battery piece 100, the power generation efficiency of the battery string 200 is improved, the use performance of the battery string 200 is improved, and the power output of the battery string 200 is improved. Moreover, the production efficiency of the battery string 200 is also improved.
[0066] According to some embodiments of the present application, referring to Figure 5 The battery string 200 further comprises a plurality of first conductive connecting pieces 6 and a plurality of second conductive connecting pieces 7.
[0067] Specifically, the plurality of first conductive connecting pieces 6 are electrically connected with the plurality of first grid lines 2 of the battery piece 100, one end of the plurality of first conductive connecting pieces 6 is electrically connected with the first bus grid line 4 of the battery piece 100, and the other end of the plurality of first conductive connecting pieces 6 is spaced apart from the second bus grid line 5 of the battery piece 100. The plurality of second conductive connecting pieces 7 are electrically connected with the plurality of second grid lines 3 of the battery piece 100, one end of the plurality of second conductive connecting pieces 7 is electrically connected with the second bus grid line 5, and the other end of the plurality of second conductive connecting pieces 7 is spaced apart from the first bus grid line 4.
[0068] For example, in the examples of Figure 4 and Figure 5 The first conductive connecting piece 6 and the second conductive connecting piece 7 can be provided as a solder strip. The number of the first conductive connecting piece 6 is the same as the number of the first grid line 2, the number of the second conductive connecting piece 7 is the same as the number of the second grid line 3, the plurality of first conductive connecting pieces 6 correspond to the plurality of first grid lines 2 one by one, and the plurality of second conductive connecting pieces 7 correspond to the plurality of second grid lines 3 one by one. Therefore, the plurality of first conductive connecting pieces 6 can not only collect current, but also return the current on the first grid line 2 and the first conductive connecting piece 6 to the first bus grid line 4. Similarly, the plurality of second conductive connecting pieces 7 can not only collect current, but also return the current on the second grid line 3 and the second conductive connecting piece 7 to the second bus grid line 5. When the first conductive connecting piece 6 and the second conductive connecting piece 7 are not provided, the resistance of the first grid line 2 and the second grid line 3 is large, which is not conducive to the transmission of current. By providing the first conductive connecting piece 6 and the second conductive connecting piece 7, the resistance can be reduced, which is conducive to the collection and transmission of current, thereby facilitating the use of the battery piece 100 and improving the use performance of the battery piece 100.
[0069] According to some embodiments of the present application, referring to Figure 5 and Figure 5The first conductive connecting pieces 6 are arranged on the side of the first busbar lines 4 away from the cell piece body 1, and the second conductive connecting pieces 7 are arranged on the side of the second busbar lines 5 away from the cell piece body 1. The first conductive connecting pieces 6 and the second conductive connecting pieces 7 extend in the up-down direction. In this way, the length of the first conductive connecting pieces 6 and the second conductive connecting pieces 7 is increased, the current collected on the first conductive connecting pieces 6 and the second conductive connecting pieces 7 is increased, and thus the photoelectric conversion efficiency of the cell piece 100 and the battery string 200 is further improved, and the output power of the battery string 200 is increased.
[0070] According to some embodiments of the present application, the length of the overlapping part of the first conductive connecting piece 6 and the first busbar line 4 is L1, and the width of the first busbar line 4 is W1, wherein L1 and W1 satisfy: 2W1 / 3≤L1≤W1. And / or, the length of the overlapping part of the second conductive connecting piece 7 and the second busbar line 5 is L2, and the width of the second busbar line 5 is W2, wherein L2 and W2 satisfy: 2W2 / 3≤L2≤W2.
[0071] For example, in the example of Figure 5 The upper end of the first conductive connecting piece 6 overlaps the first busbar line 4, and the lower end of the second conductive connecting piece 7 overlaps the second busbar line 5, so as to ensure effective contact between the first conductive connecting piece 6 and the first busbar line 4. In addition, by setting D and W to satisfy the above relationship, effective electrical connection and effective welding force between the first conductive connecting piece 6 and the first busbar line 4 are realized, and at the same time, the occurrence of cracks during the stringing process of the battery string 200 or the lamination process of the assembly is avoided.
[0072] According to some embodiments of the present application, the end of the first conductive connecting piece 6 close to the first busbar line 4 is recessed in the first end 31 of the first busbar line 2, and the distance between the end of the first conductive connecting piece 6 close to the first busbar line 4 and the first end 31 of the first busbar line 2 is D1, wherein D1 satisfies: 0.5mm≤D1≤1mm. And / or, the end of the second conductive connecting piece 7 close to the second busbar line 5 is recessed in the second end 32 of the second busbar line 3, and the distance between the end of the second conductive connecting piece 7 close to the second busbar line 5 and the second end 32 of the second busbar line 3 is D2, wherein D2 satisfies: 0.5mm≤D2≤1mm.
[0073] That is, the upper end of the first conductive connecting piece 6 is recessed in the upper end face of the first grid line 2, and the lower end of the second conductive connecting piece 7 is recessed in the lower end face of the second grid line 3. In this way, the battery piece 100 is not easy to crack, the reliability of the use of the battery piece 100 is improved, and the service life of the battery piece 100 is prolonged. According to some embodiments of the present application, in combination with Figure 5 , the battery string 200 further comprises at least one bus piece 8, and the first bus grid line 4 and the second bus grid line 5 of the adjacent two battery pieces 100 are electrically connected through the bus piece 8. For example, in the example of Figure 5 , the battery string 200 comprises three battery pieces 100, and the three battery pieces 100 are electrically connected through two bus pieces 8. For example, from top to bottom, the first battery piece 100, the second battery piece 100 and the third battery piece 100, the second bus grid line 5 of the first battery piece 100 is electrically connected with the first bus grid line 4 of the second battery piece 100 through the bus piece 8, and the second bus grid line 5 of the second battery piece 100 is electrically connected with the first bus grid line 4 of the third battery piece 100 through the bus piece 8. Thus, the series connection between the plurality of battery pieces 100 is realized, and the use of the battery piece 100 is facilitated. In addition, only one bus piece 8 is required to electrically connect the adjacent two battery pieces 100, which is simple and convenient to connect, improves the connection efficiency of the battery string 200, and can also reduce the manufacturing cost of the battery string 200.
[0074] According to some embodiments of the present application, in combination with Figure 6 , the width of the bus piece 8 in the second direction is greater than the width of the first conductive connecting piece 6, the width of the bus piece 8 in the second direction is greater than the width of the second conductive connecting piece 7, the width of the bus piece 8 in the second direction is less than the length of the first bus grid line 4 in the second direction, and the width of the bus piece 8 in the second direction is less than the length of the second bus grid line 5 in the second direction.
[0075] For example, in the example of Figure 7 , the shape of the bus piece 8 is rectangular, the width of the bus piece 8 along the left-right direction is greater than the width of the first conductive connecting piece 6 and less than the length of the first bus grid line 4, and similarly, the width of the bus piece 8 along the left-right direction is greater than the width of the second conductive connecting piece 7 and less than the length of the second bus grid line 5. In this way, the contact area between the bus piece 8 and the corresponding first bus grid line 4 and second bus grid line 5 is increased, the effective electrical connection is ensured, and the size of the bus piece 8 can also be reduced, the amount of material of the bus piece 8 is reduced, and the use cost of the bus piece 8 is reduced, thereby reducing the manufacturing cost of the battery string 200. In addition, the size of the bus piece 8 is reasonably designed, which is convenient to use and improves the production efficiency of the battery string 200.
[0076] According to some embodiments of the present application, in combination with Figure 6 and Figure 7The busbar 8 comprises a conductive layer 81, a first soldering layer 82, a second soldering layer 83 and a coating layer 84. The first soldering layer 82 and the second soldering layer 83 are arranged on the same side of the thickness direction of the conductive layer 81, the first soldering layer 82 and the second soldering layer 83 are respectively soldered with the first busbar 4 and the second busbar 5 of the adjacent two battery pieces 100, and the coating layer 84 is located between the first soldering layer 82 and the second soldering layer 83 and is located at the gap between the adjacent two battery pieces 100.
[0077] That is, the first soldering layer 82 and the second soldering layer 83 are arranged on the side of the conductive layer 81 facing the first busbar 2 and the second busbar 3. When the busbar 8 is connected with the adjacent two battery pieces 100, the busbar 8 is soldered with the first busbar 4 through the first soldering layer 82, and the busbar 8 is soldered with the second busbar 5 of the adjacent battery piece 100 through the second soldering layer 83, thereby improving the soldering performance of the battery piece 100 and the busbar 8, improving the connection reliability of the busbar 8 and the battery piece 100, and further providing the use reliability of the battery string 200. Of course, the busbar 8 can also be soldered with the second busbar 5 of the adjacent battery piece 100 through the first soldering layer 82, and soldered with the first busbar 4 of the adjacent battery piece 100 through the second soldering layer 83. In addition, the conductive layer 81 can ensure the conduction of the circuit between the adjacent two battery pieces 100, thereby ensuring the normal use of the battery string 200. In addition, by arranging the coating layer 84, the area of the first soldering layer 82 and the second soldering layer 83 can be reduced, thereby ensuring the use performance of the busbar 8 while reducing the manufacturing cost of the busbar 8.
[0078] According to some embodiments of the present application, Figure 5 and Figure 5 The coating layer 84 comprises at least one of a white coating layer 841 and a black coating layer 842. For example, when the battery string 200 is used for a full-black photovoltaic module, the coating layer 84 can be arranged as a black coating layer 842, and the coating layer 84 located at the gap between the adjacent two battery pieces 100 is black, thereby avoiding special blackening treatment during the manufacturing of the photovoltaic module, and facilitating the production and use of the photovoltaic module. When the battery string 200 is used for a conventional photovoltaic module, the coating layer 84 can be arranged as a white coating layer 841, thereby facilitating the use of the photovoltaic module. In addition, the types of the battery string 200 are diversified, and the applicability of the battery string 200 is improved, so as to be applicable to different photovoltaic modules.
[0079] According to some embodiments of the present application, the thickness of the busbar 8 is w, wherein w satisfies: 0.1mm≤w≤0.3mm. The thickness of the busbar 8 refers to The middle vertical direction is perpendicular to the plane where the battery piece 100 is located. In this way, the thickness of the busbar 8 is small, and the application of the ultra-thin busbar 8 can reduce the inter-piece gap (the gap between adjacent battery pieces 100) to less than 0.3mm, thereby facilitating the arrangement of the battery piece 100 and the preparation of the battery string 200.
[0080] According to some embodiments of the present application, the busbar 8 is a plurality of busbars, the plurality of battery pieces 100 are electrically connected by the plurality of busbars 8, and the busbar 8 located at the edge of the battery string 200 has a connecting portion 85, the connecting portion 85 extends along the second direction, and the connecting portion 85 is suitable for electrically connecting with the adjacent battery string 200.
[0081] For example, in the example of two adjacent battery pieces 100 are connected by one busbar 8, and the busbar 8 located at the tail of the battery string 200 is arranged in an inverted T shape. For example, one side of the busbar 8 is overlapped with the positive busbar grid line (one of the first busbar grid line 4 and the second busbar grid line 5 is a positive busbar grid line, and the other is a negative busbar grid line) of the adjacent battery piece 100 upstream along the arrangement direction of the battery piece 100, and the other side is overlapped with the negative busbar grid line of the adjacent battery piece 100 downstream along the arrangement direction of the battery piece 100, so as to realize the positive and negative conduction. The connecting portion 85 extends along the left-right direction, and when a plurality of battery strings 200 are arranged along the left-right direction, the connecting portion 85 can be electrically connected with the adjacent other battery string, so as to realize the series connection or parallel connection of the plurality of battery strings 200, thereby facilitating the connection and arrangement of the plurality of battery strings 200.
[0082] The photovoltaic module (not shown in the figure) according to the third aspect of the present application comprises the battery piece 100 according to the first aspect of the present application or the battery string 200 according to the second aspect of the present application.
[0083] The photovoltaic module according to the present application improves the production efficiency and use performance of the photovoltaic module by using the above-mentioned battery piece 100 or battery string 200. For example, a laminated module can also be made.
[0084] The photovoltaic power generation system (not shown in the figure) according to the present application improves the production efficiency and use performance of the photovoltaic power generation system by using the above-mentioned battery piece 100, battery string 200 or photovoltaic module.
[0085] The photovoltaic power generation system according to the present application reduces the production cost of the photovoltaic power generation system, improves the power generation capacity of the photovoltaic power generation system, and improves the use performance of the photovoltaic power generation system by using the above-mentioned battery piece 100, the above-mentioned battery string 200 or the above-mentioned photovoltaic module.
[0086] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and so on the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation configuration and operation, therefore can not be understood as the restriction of the utility model.
[0087] In the description of the utility model, "first feature", "second feature" can include one or more features.In the description of the utility model, "multiple" means two or more than two.In the description of the utility model, the first feature is "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them.In the description of the utility model, the first feature is "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.
[0088] In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model.In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.
[0089] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and its equivalents.
Claims
1. A battery sheet, characterized by, The battery piece comprises: a battery piece body; a plurality of first grid lines, the plurality of first grid lines are arranged on one side surface of the battery piece body, the plurality of first grid lines each extend along a first direction, the plurality of first grid lines are arranged at intervals along a second direction, the second direction is perpendicular to the first direction, and the first direction is the arrangement direction of the plurality of battery pieces of a battery string; a plurality of second grid lines, the plurality of second grid lines are arranged on the one side surface of the battery piece body, the plurality of second grid lines each extend along the first direction, the plurality of second grid lines and the plurality of first grid lines are alternately arranged at intervals along the second direction, the polarity of the second grid lines is opposite to that of the first grid lines, one end of the first grid lines and the second grid lines along the first direction is a first end, and the other end of the first grid lines and the second grid lines along the first direction is a second end; a first bus grid line, the first bus grid line is connected to the first ends of the plurality of first grid lines, and the first bus grid line and the first ends of the plurality of second grid lines are spaced apart from each other; a second bus grid line, the second bus grid line is connected to the second ends of the plurality of second grid lines along the first direction, and the second bus grid line and the second ends of the plurality of first grid lines are spaced apart from each other.
2. The battery sheet of claim 1, wherein, The first bus grid line extends along the second direction, the plurality of first grid lines are parallel to each other, and the first bus grid line is perpendicular to the plurality of first grid lines. The second bus grid line extends along the second direction, the plurality of second grid lines are parallel to each other, and the second bus grid line is perpendicular to the plurality of second grid lines.
3. The battery sheet of claim 1, wherein, The plurality of first grid lines and the plurality of second grid lines are uniformly arranged at intervals along the second direction.
4. The battery sheet of claim 3, wherein, The distance between the first grid line and the adjacent second grid line is d1, wherein the d1 satisfies: 0.3 mm≤d1≤2 mm.
5. The battery sheet of claim 1, wherein, The distance between the first bus grid line and the first end of the second grid line is d2, wherein the d2 satisfies: 0.3 mm≤d2≤1 mm; and / or The distance between the second bus grid line and the second end of the first grid line is d3, wherein the d3 satisfies: 0.3 mm≤d3≤1 mm.
6. The battery sheet of claim 1, wherein, The width of the first bus grid line is greater than the width of the first grid line. The width of the second bus grid line is greater than the width of the second grid line.
7. The battery sheet of any one of claims 1-6, wherein, The two ends of the first direction of the plurality of first grid lines are flush with each other; and / or The two ends of the first direction of the plurality of second grid lines are flush with each other.
8. A battery string, characterized by The battery piece comprises: a plurality of battery pieces, the battery piece is according to any one of claims 1-7, the plurality of battery pieces are arranged along a first direction, and two adjacent battery pieces are electrically connected.
9. The battery string of claim 8, wherein, Further comprising: a plurality of first conductive connecting pieces, the plurality of first conductive connecting pieces are respectively electrically connected with the plurality of first grid lines of the battery piece, and the other ends of the plurality of first conductive connecting pieces are spaced apart from the second bus grid line of the battery piece. A plurality of second conductive connecting pieces, each of the plurality of second conductive connecting pieces is electrically connected with a second grid line of the battery piece, and the other end of each of the plurality of second conductive connecting pieces is spaced apart from the first bus bar grid line of the battery piece.
10. The battery string of claim 9, wherein, Each of the plurality of first conductive connecting pieces extends along the first direction, and each of the plurality of first conductive connecting pieces covers a first grid line. Each of the plurality of second conductive connecting pieces extends along the first direction, and each of the plurality of second conductive connecting pieces covers a second grid line.
11. The battery string of claim 9, wherein, The length of the overlapping part of the first conductive connecting piece and the first bus bar grid line is L1, and the width of the first bus bar grid line is W1, wherein the L1 and W1 satisfy: 2W1 / 3≤L1≤W1; and / or the length of the overlapping part of the second conductive connecting piece and the second bus bar grid line is L2, and the width of the second bus bar grid line is W2, wherein the L2 and W2 satisfy: 2W2 / 3≤L2≤W2.
12. The battery string of claim 9, wherein, The end of the first conductive connecting piece close to the first bus bar grid line is recessed to the first end of the first grid line, and the distance between the end of the first conductive connecting piece close to the first bus bar grid line and the first end of the first grid line is D1, wherein the D1 satisfies: 0.5mm≤D1≤1mm; and / or The end of the second conductive connecting piece close to the second bus bar grid line is recessed to the second end of the second grid line, and the distance between the end of the second conductive connecting piece close to the second bus bar grid line and the second end of the second grid line is D2, wherein the D2 satisfies: 0.5mm≤D2≤1mm.
13. The battery string of any one of claims 9-12, wherein, Further comprising: At least one bus piece, the first bus bar grid line and the second bus bar grid line of adjacent two battery pieces are electrically connected through the bus piece.
14. The battery string of claim 13, wherein, The width of the bus piece in the second direction is greater than the width of the first conductive connecting piece, the width of the bus piece in the second direction is greater than the width of the second conductive connecting piece, the width of the bus piece in the second direction is less than the length of the first bus bar grid line in the second direction, and the width of the bus piece in the second direction is less than the length of the second bus bar grid line in the second direction.
15. The battery string of claim 13, wherein, The bus piece comprises: A conductive layer; A first soldering aid layer and a second soldering aid layer, the first soldering aid layer and the second soldering aid layer are arranged on the same side of the thickness direction of the conductive layer, and the first soldering aid layer and the second soldering aid layer are respectively soldered with the first bus bar grid line and the second bus bar grid line of adjacent two battery pieces; A coating layer between the first soldering aid layer and the second soldering aid layer, and the coating layer is located at the gap between adjacent two battery pieces.
16. The battery string of claim 15, wherein, The coating layer comprises at least one of a white coating layer and a black coating layer.
17. The battery string of claim 13, wherein, The thickness of the bus piece is w, wherein the w satisfies: 0.1mm≤w≤0.3mm.
18. The battery string of claim 13, wherein, The bus piece is a plurality of bus pieces, a plurality of battery pieces are electrically connected through a plurality of bus pieces, and the bus piece located at the edge of the battery string has a connecting part, the connecting part extends along the second direction, and the connecting part is suitable for electrically connecting with adjacent battery strings.
19. A photovoltaic module, characterized by A battery string comprising a battery sheet according to any one of claims 1-7, or a battery string according to any one of claims 8-18, or a photovoltaic module according to claim 19.
20. A photovoltaic power system, characterized by A battery string comprising a battery sheet according to any one of claims 1-7, or a battery string according to any one of claims 8-18, or a photovoltaic module according to claim 19.