Battery piece, photovoltaic module and photovoltaic system

Abstract

The embodiment of the utility model provides a battery piece, a photovoltaic module and a photovoltaic system. The battery piece comprises a substrate which is provided with a first edge and a second edge which are perpendicular to each other; the plurality of bus electrodes are arranged on the surface of the substrate, the bus electrodes extend in the direction of the first edges and are arranged at intervals in the direction of the second edges, and the plurality of bus electrodes comprise two edge bus electrodes which are arranged adjacent to the two first edges; the inner sides of the two edge bus electrodes are provided with a row of edge interconnection strip connecting parts, and a plurality of rows of middle interconnection strip connecting parts are arranged between the two rows of edge interconnection strip connecting parts; the edge interconnecting strip connecting part is electrically connected with the edge bus electrode, and the distance between the edge bus electrode and the edge interconnecting strip connecting part is m; the distance between the edge interconnecting strip connecting part and the adjacent middle interconnecting strip connecting part and the distance between the two adjacent columns of middle interconnecting strip connecting parts are n; m is more than 0.17 n and less than 0.5 n, and m and n are both greater than zero. The battery piece provided by the utility model has a relatively high photoelectric conversion rate, and the quality during interconnection is better.

Description

Technical Field

[0001] The present application relates to the photovoltaic field, and in particular to a solar cell, a photovoltaic module and a photovoltaic system. Background Art

[0002] Under the guidance and promotion of the "dual carbon" strategy, the green and environmentally friendly industry of photovoltaic power generation has developed rapidly. Photovoltaic components have gradually been applied to various fields of social life and are highly favored by users.

[0003] Generally, a photovoltaic module includes a plurality of photovoltaic cell strings, which are connected by a plurality of photovoltaic cells through interconnection bars. The current generated on the surface of the solar cell substrate is transferred to the corresponding interconnection bars through the positive grid lines and the negative grid lines.

[0004] The position of the interconnection bar on the photovoltaic cell string affects the current collection efficiency. Therefore, how to set the position of the interconnection bar has become a technical problem that needs to be solved urgently in the industry. Utility Model Content

[0005] The present application provides a solar cell, a photovoltaic module and a photovoltaic system to solve the problem that the interconnection strips on the existing solar cells affect the current collection efficiency.

[0006] In order to solve the above problems, this application is implemented as follows:

[0007] The present application provides a battery cell, including:

[0008] A substrate having a first side and a second side perpendicular to each other;

[0009] A plurality of bus electrodes, the bus electrodes are arranged on the surface of the substrate, the bus electrodes extend in the direction of the first edge, and are arranged at intervals in the direction of the second edge, the plurality of bus electrodes include two edge bus electrodes, and the two edge bus electrodes are respectively arranged adjacent to two of the first edges;

[0010] The inner sides of the two edge bus electrodes away from the first side are each provided with a row of edge interconnection bar connection parts, and a plurality of rows of middle interconnection bar connection parts are provided between the two rows of edge interconnection bar connection parts;

[0011] The edge interconnection strip connection portion is electrically connected to the edge bus electrode, and the spacing between the edge bus electrode and the edge interconnection strip connection portion is m; the spacing between the edge interconnection strip connection portion and the adjacent intermediate interconnection strip connection portion and the spacing between two adjacent columns of intermediate interconnection strip connection portions is n; the value of m is greater than 0.17n and less than 0.5n, and both m and n are greater than zero.

[0012] Optionally, the plurality of bus electrodes further include an intermediate bus electrode, and the remaining bus electrodes between the two edge bus electrodes are the intermediate bus electrodes;

[0013] The intermediate bus electrodes serve as a row of intermediate interconnection bar connection portions, or the intermediate bus electrodes are provided with the intermediate interconnection bar connection portions.

[0014] Optionally, the value of m is greater than 0.18n and less than 0.3n; and / or,

[0015] The size of m is greater than 1.8 mm and less than 3.5 mm; and / or,

[0016] The size of n is greater than 8 mm and less than 13 mm.

[0017] Optionally, the base further has a chamfered bevel connecting the first edge and the second edge;

[0018] Along the extension direction of the second side, the distance between the edge interconnection strip connecting portion and the first side is greater than the distance between the end point of the second side and the first side.

[0019] Optionally, along the direction where the first edge is located, a distance between the edge interconnection strip connecting portion close to the second edge and the second edge is greater than 5 mm and less than 9 mm; and / or,

[0020] Along the direction where the first side is located, r edge interconnection strip connection portions are arranged at equal intervals, 6≤r≤10; and / or,

[0021] Along the direction of the second side, the interconnection strip connection parts have 16-22 columns; and / or,

[0022] Along the direction of the first side, s intermediate interconnection strip connecting portions are arranged at equal intervals, 6≤s≤10; and / or,

[0023] Along the direction of the first side, the distance between two adjacent connecting portions of the interconnecting strips is greater than 10 mm and less than 13 mm, and / or,

[0024] Along the direction of the second side, a distance between two adjacent interconnection strip connection portions is greater than 8 mm and less than 13 mm.

[0025] Optionally, along the direction of the first side, the span of the interconnection bar connection portion is greater than 1.5 mm and less than 2.2 mm; and / or,

[0026] Along the direction of the second side, the span of the interconnection strip connection portion is greater than 1.1 mm and less than 1.8 mm; and / or,

[0027] The edge interconnection bar connecting portion and the middle interconnection bar connecting portion are rectangular; and / or,

[0028] The interconnection strip connecting portion has an extension section extending along the direction of the first edge, the length of the extension section is 0.15 mm-0.4 mm, and the width of the extension section is 0.1 mm-0.3 mm.

[0029] Optionally, the edge bus electrode is an edge cathode bus electrode, and the edge cathode bus electrode is in a wavy line shape; and / or,

[0030] The intermediate cathode bus electrode in the intermediate bus electrodes is in a wavy line shape.

[0031] Optionally, the battery cell further comprises a connecting wire, one end of which is electrically connected to the edge interconnection bar connecting portion, and the other end of which is electrically connected to the edge bus electrode;

[0032] The length of the connecting line is greater than 1.2 mm and less than 2.5 mm; and / or,

[0033] The width of the connecting line is greater than 0.1 mm and less than 0.6 mm.

[0034] Optionally, a distance between a side of the edge bus electrode away from the edge interconnection bar connecting portion and the first side is greater than 0.32 mm and less than 0.5 mm.

[0035] Optionally, along the direction of the first side, the size of the battery cell is greater than 94 mm and less than 106 mm;

[0036] Along the direction of the second side, the size of the battery cell is greater than 177.2 mm and less than 187.2 mm.

[0037] Optionally, the busbar electrode is a main grid, and the cell is a cell with a main grid; or,

[0038] The busbar electrode is a busbar connection line, and the battery cell is a busbar-free battery cell.

[0039] An embodiment of the present application further provides a photovoltaic module, which includes a plurality of battery strings, wherein the battery string includes a plurality of any of the aforementioned battery cells, wherein interconnection bar connection portions of the plurality of battery cells in the battery string are connected in series via an interconnection bar.

[0040] Optionally, the length of the photovoltaic module is greater than 2380 mm and less than 2384 mm; or,

[0041] The length of the photovoltaic module is greater than 1992 mm and less than 1996 mm; or,

[0042] The length of the photovoltaic module is greater than 1798 mm and less than 1802 mm.

[0043] An embodiment of the present application also provides a photovoltaic system, comprising a plurality of any of the aforementioned photovoltaic components arranged in an array.

[0044] In implementation, if the edge bus electrode and the edge interconnection bar connection are close to the middle of the battery, the current collection at the edge of the battery cell is insufficient, resulting in the restriction of the improvement of the photoelectric conversion rate; if the edge bus electrode and the edge interconnection bar connection are close to the edge of the battery cell, the process defect rate when the battery cells are interconnected will be greatly increased. In the embodiment of the present application, the spacing between the edge interconnection bar connection and the middle interconnection bar connection, and the spacing between the middle interconnection bar connection of two adjacent columns are n. By staggering the edge bus electrode and the edge interconnection bar connection on the battery cell, the two are separated by a certain distance m, and m and n satisfy 0.17n≤m≤0.5n, the battery cell can fully collect the photocurrent at the edge, have a higher photoelectric conversion rate, and the distance from the edge interconnection bar connection to the edge bus electrode and the distance to the middle interconnection bar connection are appropriate. On the one hand, the efficiency of the current transmission from the edge area of ​​the battery cell to the edge bus electrode and the edge interconnection bar connection can be improved, and the loss of the current transmission to the edge bus electrode and the current transmission to the edge interconnection bar connection can be reduced. On the other hand, the middle interconnection bar connection can efficiently gather and transmit the current in the middle area of ​​the battery cell, reducing current loss. At the same time, when m and n satisfy the above relationship, quality defects when the edge interconnection strips and the edge interconnection strip connection parts are interconnected can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0046] Figure 1 A schematic diagram showing the electrode structure of a battery cell according to an embodiment of the present application;

[0047] Figure 2 Indicates the embodiment of the present application Figure 1 A partial enlarged schematic diagram of the middle I position;

[0048] Figure 3 Indicates the embodiment of the present application Figure 1 A partial enlarged schematic diagram of the middle II position;

[0049] Figure 4Indicates the embodiment of the present application Figure 1 A partial enlarged schematic diagram of the middle III position.

[0050] Description of reference numerals:

[0051] Substrate-10, edge bus electrode-11a, middle bus electrode-11b, edge interconnection bar connection portion-12, middle interconnection bar connection portion-13, connection line-14, first edge-101, second edge-102, chamfered bevel edge-103. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0054] Reference Figures 1 to 3 , the embodiment of the present application provides a battery cell, including:

[0055] A substrate 10, wherein the substrate 10 has a first side 101 and a second side 102 that are perpendicular to each other;

[0056] A plurality of bus electrodes 11, wherein the bus electrodes 11 are disposed on the surface of the substrate 10, the bus electrodes 11 extend along the direction of the first edge 101, and are arranged at intervals along the direction of the second edge 102, and the plurality of bus electrodes 11 include two edge bus electrodes 11a, and the two edge bus electrodes 11a are respectively disposed adjacent to two of the first edges 101;

[0057] The inner sides of the two edge bus electrodes 11a away from the first side 101 are each provided with a row of edge interconnection bar connection parts 12, and a plurality of rows of middle interconnection bar connection parts 13 are provided between the two rows of edge interconnection bar connection parts 12;

[0058] The edge interconnection strip connection portion 12 is electrically connected to the edge bus electrode 11a, and the spacing between the edge bus electrode 11a and the edge interconnection strip connection portion 12 is m; the spacing between the edge interconnection strip connection portion 12 and the adjacent intermediate interconnection strip connection portion 13 and the spacing between two adjacent columns of the intermediate interconnection strip connection portions 13 is n; the value of m is greater than 0.17n and less than 0.5n, and both m and n are greater than zero.

[0059] like Figure 1 As shown in the figure, a battery cell provided in an embodiment of the present application includes a substrate 10 made of silicon material, the substrate 10 has a first side 101 and a second side 102 that are perpendicular to each other, the two first sides 101 are parallel to each other, and the two second sides 102 are parallel to each other, and the substrate 10 can be surrounded by a square or rectangular shape, and chamfers are formed at the four corners of the substrate 10.

[0060] The substrate 10 is used as a structural carrier of the battery cell, and is processed to have a PN junction. In addition, a plurality of bus electrodes 11 are processed and arranged on the surface of the substrate 10 by screen printing or electroplating. These bus electrodes 11 extend along the direction of the first side 101, that is, along the Figure 1 Furthermore, the bus electrodes 11 are arranged at intervals along the direction of the second side 102, that is, along Figure 1 Schematic diagram of the X-direction spacing arrangement.

[0061] like Figure 1 As shown in the figure, the two bus electrodes 11 adjacent to the left and right first sides 101 are edge bus electrodes 11a, which are used to collect the current generated at the edge of the battery cell. The two edge bus electrodes 11a are each provided with a row of edge interconnection bar connection parts 12 on the inner side away from the first side 101. Each row of edge interconnection bar connection parts 12 may include a plurality of interconnection bar connection parts in rectangular or other polygonal shapes. Figure 1 The schematic diagram shows that the interconnection bars are arranged in a row at intervals in the Y direction. The two rows of edge interconnection bar connection parts 12 can be used as the locations where the interconnection bars arranged at the edges of the battery cells are electrically connected. Multiple rows of middle interconnection bar connection parts 13 are arranged between the two rows of edge interconnection bar connection parts 12, and the middle interconnection bar connection parts 13 can be used as the locations where the interconnection bars arranged in the middle of the battery cells are electrically connected.

[0062] It can be seen that the difference from the traditional cell structure is that, on the cell of the embodiment of the present application, the edge bus electrode 11a is closer to the edge of the cell, which can more fully collect the photocurrent at the edge, and the edge interconnection bar connection portion 12 is biased toward the inside of the cell relative to the edge bus electrode 11a, which can reduce the quality defects caused by the use of edge interconnection bars for interconnection.

[0063] In addition, combined Figure 2and Figure 3 As shown in the figure, the spacing between the edge bus electrode 11a and the edge interconnection bar connection part 12 is m, the spacing between the edge interconnection bar connection part 12 and the middle interconnection bar connection part 13 is n, and the spacing between two adjacent columns of middle interconnection bar connection parts 13 is n. It should be noted that the measurement basis of the spacing m in the embodiment of the present application is the minimum distance between the center of the edge bus electrode 11a and the center of the edge interconnection bar 12. The measurement basis of the spacing n is the minimum distance between the center of the edge interconnection bar connection part 12 and the center of the middle interconnection bar connection part 13, or the center of two adjacent columns of middle interconnection bar connection parts 13.

[0064] Combined with the above description, it is easy to understand that when m is too small (for example, m does not exceed 0.17n), the distance between the edge bus electrode 11a and the edge interconnection bar connection portion 12 is too small, causing the edge interconnection bar connection portion 12 to be closer to the edge of the battery cell, and the risk of battery cell failure during the battery cell interconnection process increases. When m is too large (for example, m is not less than 0.5n), the transmission loss of the edge current of the battery cell is large. Therefore, in the battery cell of the embodiment of the present application, m and n satisfy 0.17n≤m≤0.5n, and m and n are both greater than zero. For example, m can be 0.17n, 0.18n, 0.2n, 0.25n, 0.28n, 0.29n, 0.3n, 0.35n, 0.4n, 0.45n, 0.5n, etc. It should be noted that in the embodiment of the present application, the interconnection process of multiple battery cells to form a battery string can be a welding process to connect the interconnection bar with each battery cell arranged linearly in series. Of course, the interconnection process can also be to use other conductive media such as conductive glue to electrically connect the individual battery cells in series to form a battery string. For example, the conductive glue can be used to bond and fix the interconnection strips to the corresponding interconnection strip connection parts, thereby interconnecting the individual battery cells into a battery string. In the battery cell of the embodiment of the present application, the spacing between the edge interconnection bar connection part 12 and the middle interconnection bar connection part 13, and the spacing between two adjacent columns of middle interconnection bar connection parts 13 are both n. By staggering the edge bus electrode 11a and the edge interconnection bar connection part 12 on the battery cell, the two are separated by a certain distance m, and m and n satisfy 0.17n≤m≤0.5n, the battery cell can fully collect the photocurrent at the edge, have a high photoelectric conversion rate, and the distance from the edge interconnection bar connection part 12 to the edge bus electrode and the distance to the middle interconnection bar connection part are appropriate. On the one hand, the efficiency of the current transmission from the edge area of ​​the battery cell to the edge bus electrode and the edge interconnection bar connection part 12 can be improved, and the loss of the current transmission to the edge bus electrode and the current transmission to the edge interconnection bar connection part 12 can be reduced. On the other hand, the middle interconnection bar connection part can efficiently gather and transmit the current in the middle area of ​​the battery cell, reducing the current loss. At the same time, when m and n satisfy the above relationship, the quality defects when the edge interconnection bar and the edge interconnection bar connection part 12 are interconnected can also be reduced.

[0065] Optionally, refer to Figure 1 , the plurality of bus electrodes 11 further include an intermediate bus electrode 11 b, and the remaining bus electrodes 11 between the two edge bus electrodes 11 a are the intermediate bus electrodes 11 b;

[0066] The intermediate bus electrode 11 b serves as a row of the intermediate interconnection bar connection portions 13 , or the intermediate bus electrode 11 b is provided with the intermediate interconnection bar connection portions 13 .

[0067] Specifically, if Figure 1As shown in the figure, in the embodiment of the present application, the plurality of bus electrodes 11 include, in addition to the edge bus electrodes 11a, a plurality of intermediate bus electrodes 11b located between the two edge bus electrodes 11a on the left and right sides. Some of these intermediate bus electrodes 11b are positive electrodes, and some are negative electrodes, and the positive electrodes and the negative electrodes are alternately arranged with each other along the X direction shown in the figure.

[0068] In one embodiment, the middle bus electrode 11b can be directly used as a column of middle interconnection bar connection parts 13, which are directly used to electrically connect with the middle interconnection bar, thereby reducing the process of preparing the middle interconnection bar connection parts 13. In another embodiment, the middle bus electrode 11b can also be provided with middle interconnection bar connection parts 13 which are dedicated to electrically connecting with the middle interconnection bar. Similar to the edge interconnection bar connection parts 12, each column of middle interconnection bar connection parts 13 can include a plurality of interconnection bar connection parts in rectangular or other polygonal shapes, and the plurality of interconnection bar connection parts are arranged along Figure 1 The schematic Y direction is arranged in a row at intervals to ensure the interconnection reliability of the middle interconnection strip.

[0069] Optionally, the value of m is greater than 0.18n and less than 0.3n.

[0070] Specifically, based on the above embodiment, m can also be greater than or equal to 0.18n and less than or equal to 0.3n, for example, m can be 0.18n, 0.19n, 0.2n, 0.23n, 0.25n, 0.28n, 0.29n, 0.3n, etc. Thus, the moving interval of the edge interconnection bar connection portion 12 between the edge bus electrode 11a and the middle interconnection bar connection portion 13 is narrower, the interconnection reliability can be further improved, and the current loss can be further reduced.

[0071] Optionally, the size of m is greater than 1.8 mm and less than 3.5 mm. At this time, the position design of the edge interconnection strip connection portion 12 can take into account the current collection efficiency, interconnection reliability, and interconnection process yield.

[0072] Specifically, in one embodiment, for battery cells of certain specifications and sizes, the size of m may be between 1.8 mm and 3.5 mm. For example, m may be 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc.

[0073] Optionally, the size of n is greater than 8 mm and less than 13 mm. In this case, the position layout of the middle interconnection strip connection portion 13 can have a better current collection and transmission effect.

[0074] Specifically, in one embodiment, for battery cells of certain specifications and sizes, the size of m may be between 8 mm and 13 mm. For example, m may be 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, etc.

[0075] Optionally, refer to Figure 4 , the base 10 further has a chamfered bevel 103 connecting the first edge 101 and the second edge 102;

[0076] Along the extension direction of the second side 102 , a distance d1 between the edge interconnection strip connecting portion 12 and the first side 101 is greater than a distance d2 between an end point of the second side 102 and the first side 101 .

[0077] Specifically, in one embodiment, Figure 4 As shown in the figure, the base 10 is cut at the intersection of the first side 101 and the second side 102 to form a chamfer, and the chamfer has a chamfered bevel 103. Along the extension direction of the second side 102, the distance between the edge interconnection strip connection part 12 and the first side 101 is d1, and the distance between the end point of the second side 102 and the first side 101 is d2, and d2 is the length of the right angle side corresponding to the chamfer. When d1 is greater than d2, at least half of the edge interconnection strip connection part 12 can be located outside the trapezoidal area corresponding to the chamfer, and the edge interconnection strip connection part 12 can avoid the chamfer, so as to prevent the interconnection strip from crushing the battery cell when passing through the chamfer position, thereby preventing hidden cracks or fragments of the battery cell.

[0078] Optionally, refer to Figure 4 , along the direction of the first side 101 , a distance d3 between the edge interconnection strip connecting portion 12 close to the second side 102 and the second side 102 is greater than 5 mm and less than 9 mm.

[0079] Specifically, in one embodiment, Figure 4As shown in the figure, along the direction where the first side 101 is located, the two interconnection bar connection parts located at both ends close to the second side 102 in a row of edge interconnection bar connection parts 12 can be respectively referred to as the head interconnection bar connection part and the tail interconnection bar connection part, and the distance between the center of the head interconnection bar connection part and the corresponding second side 102 is d3, and the distance between the center of the tail interconnection bar connection part and the corresponding second side 102 is d3. When d3 is too small (for example, less than 5mm), the position of the interconnection bar connection part is too close to the edge of the battery cell, and the equipment and process operation during interconnection are likely to cause damage to the battery cell. When d3 is too large (for example, greater than 9mm), the position of the interconnection bar connection part is too far away from the edge of the battery cell, and the distance between the interconnection bar and the interconnection bar connection part is long, which will generate unnecessary current transmission loss, and it is easy to generate uneven force of the interconnection bar on the battery cell. Therefore, in the embodiment of the present application, 5mm≤d3≤9mm, for example, d3 can be 5mm, 6mm, 7mm, 8mm, 9mm, etc. At this time, the design of d3 can not only reduce the risk of damage to the edge of the battery cell caused by interconnection, but also reduce current loss, improve current collection and convergence efficiency, and evenly disperse the force of the interconnection strip on the battery cell.

[0080] Optionally, along the direction where the first side 101 is located, r edge interconnection strip connecting portions 12 are arranged at equal intervals, and 6≤r≤10.

[0081] Specifically, in one embodiment, the number of edge interconnection strip connection parts 12 arranged in a row can be more than 6 and less than 10, specifically 6, 7, 8, 9, or 10. Specifically, the more edge interconnection strip connection parts 12 there are, the more reliable the interconnection fixation is, but the cost will increase. Based on the above, the number of edge interconnection strip connection parts 12 of the present application can take into account both the reliability of the interconnection and the reduction of the cost.

[0082] Optionally, along the direction of the second side 102, the interconnection bar connection parts have 16-22 columns, such as 16 columns, 17 columns, 18 columns, 19 columns, 20 columns, 21 columns, 22 columns, etc. The number of columns of the interconnection bar connection parts here is the total number of columns of the edge interconnection bar connection parts 12 and the middle interconnection bar connection parts 13. At this time, the interconnection bar has a higher efficiency in collecting current on the battery cell.

[0083] Optionally, along the direction where the first side 101 is located, s intermediate interconnection strip connecting portions 13 are arranged at equal intervals, and 6≤s≤10.

[0084] Specifically, in one embodiment, the middle interconnection strip connection parts 13 arranged in a row can be arranged at 6

[0085] The number of the intermediate interconnection strip connection parts 13 is less than 10, and can be 6, 7, 8, 9, or 10. Specifically, the more the intermediate interconnection strip connection parts 13 are, the more reliable the interconnection is, but the cost will increase. Based on the above, the number of the intermediate interconnection strip connection parts 13 of the present application can take into account both the reliability of the interconnection and the reduction of the cost.

[0086] Optionally, refer to Figure 1 Along the direction of the first side 101, the distance d4 between two adjacent interconnection strip connection portions is greater than 10 mm and less than 13 mm.

[0087] Specifically, in one embodiment, there are adjacent edge interconnection bar connection parts 12 and adjacent middle interconnection bar connection parts along the direction of the first side 101. Along the Y direction shown in the figure, whether it is two adjacent edge interconnection bar connection parts 12 or two adjacent middle interconnection bar connection parts 13, the spacing between adjacent interconnection bar connection parts is d4.

[0088] Figure 1 The schematic diagram shows that the distance between two adjacent edge interconnection strip connection parts 12 is d4. Figure 1 As shown, along the direction where the first side 101 is located, the spacing between two adjacent edge interconnection bar connection parts 12 is d4. When d4 is large (for example, greater than 13mm), the arrangement density of the edge interconnection bar connection parts 12 is relatively sparse, which is not conducive to the reliable interconnection and fixation of the interconnection bar and the battery cell. When d4 is small (for example, less than 10mm), the spacing between the edge interconnection bar connection parts 12 is close, the fixing parts during interconnection are too close, and the force is relatively concentrated, especially during welding, the heat is easy to accumulate in the interconnection bar and the local part of the battery cell. Therefore, in the embodiment of the present application, 10mm≤d4≤13mm, for example, d4 can be 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, etc. At this time, the distribution of the interconnection bar connection parts can not only have a better current transmission effect, but also easily achieve reliable interconnection. Of course, when the spacing d4 between two adjacent intermediate interconnection bar connection parts 13 meets the above conditions, it also has the same advantages, and the embodiment of the present application will not be repeated.

[0089] Optionally, refer to Figure 1 Along the direction of the second side 102 , the distance d5 between two adjacent interconnection strip connecting portions 13 is greater than 8 mm and less than 13 mm.

[0090] Specifically, in one embodiment, along the direction of the second edge 102 , the spacing between two adjacent columns of interconnecting strip connection parts is d5, and d5 can be the spacing between the edge interconnecting strip connection part 12 and the adjacent middle interconnecting strip connection part 13, or the spacing between two adjacent columns of middle interconnecting strip connection parts 13.

[0091] Figure 1 The schematic diagram shows that the distance between two adjacent middle interconnection strip connection parts 13 in the X direction is d5. Figure 1 As shown, along the direction where the second side 102 is located, the spacing between two adjacent intermediate interconnection bar connection parts 13 is d5. When d5 is large (for example, greater than 13mm), the arrangement density of the intermediate interconnection bar connection parts 13 is relatively sparse, which is not conducive to comprehensive and sufficient collection of current. When d5 is small (for example, less than 8mm), the spacing between the intermediate interconnection bar connection parts 13 is close, and the intermediate interconnection bar connection parts 13 are relatively dense, which easily leads to an increase in interconnection costs. Therefore, in the embodiment of the present application, 8mm≤d5≤13mm, for example, d4 can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, etc.

[0092] Optionally, refer to Figure 2 , along the direction of the first edge 101 , the span d6 of the interconnection strip connection portion is greater than 1.5 mm and less than 2.2 mm.

[0093] Specifically, in one embodiment, Figure 2 As shown, along the direction where the first edge 101 is located, when the interconnection bar connection portion is the edge interconnection bar connection portion 12, d6, that is, the maximum size of the outer edge contour formed by the connection parts protruding at both ends of the edge interconnection bar connection portion 12 in the Y direction. When the interconnection bar connection portion is the middle interconnection bar connection portion 13, d6 is its maximum size in the Y direction. When d6 is large (for example, greater than 2.2mm), the interconnection bar connection portion is longer in the Y direction, which requires more materials required for interconnection, increasing the interconnection cost. When d6 is small (for example, less than 1.5mm), the interconnection bar connection portion is short in the Y direction, which may cause the interconnection between the interconnection bar and the battery cell to be not reliable enough. Therefore, in the embodiment of the present application, 1.5mm≤d6≤2.2mm can take into account both interconnection reliability and cost reduction. For example, d6 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, etc.

[0094] Optionally, refer to Figure 2 , along the direction where the second side 102 is located, the span d7 of the interconnection strip connection portion is greater than 1.1 mm and less than 1.8 mm.

[0095] Specifically, in one embodiment, Figure 2As shown, along the direction where the second side 102 is located, when the interconnection bar connection portion is the edge interconnection bar connection portion 12, d7 is the maximum size of the outer edge contour formed by the edge interconnection bar connection portion 12 in the X direction. When the interconnection bar connection portion is the middle interconnection bar connection portion 13, d7 is the maximum size of the outer edge contour formed by the middle interconnection bar connection portion 12 in the X direction. When d7 is large (for example, greater than 1.8mm), the interconnection bar connection portion is longer in the X direction, which requires more materials required for interconnection, increasing the interconnection cost. When d7 is small (for example, less than 1.1mm), the edge interconnection bar connection portion 12 is short in the X direction, which may cause the interconnection bar and the battery cell to be not reliable enough. Therefore, in the embodiment of the present application, 1.1mm≤d7≤1.8mm can take into account both interconnection reliability and cost reduction. For example, d7 can be 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, etc.

[0096] Optionally, the edge interconnection bar connection portion 12 and the middle interconnection bar connection portion 13 are rectangular.

[0097] Specifically, in one embodiment, the edge interconnection bar connection portion 12 and the middle interconnection bar connection portion 13 may both be rectangular in shape, and the long side of the rectangle is arranged along the direction of the first side 101. Thus, more fixed connection area can be provided for the interconnection bar.

[0098] Optionally, refer to Figure 4 The edge interconnection strip connecting portion 12 has an extension section 121 extending along the direction of the first edge 101 , the length L of the extension section 121 is 0.15 mm-0.4 mm, and the width W of the extension section 121 is 0.1 mm-0.3 mm.

[0099] Specifically, in one embodiment, Figure 4 As shown, the edge interconnection strip connection part 12 has an extension section 121 extending in the direction of the first side 101, and the extension section 121 extends outward from the main body of the edge interconnection strip connection part 12 to form a structure similar to a tentacle, so as to facilitate the use of a short connection size and a fine grid electrical connection on the battery sheet. Exemplarily, the length L of the extension section 121 can be 0.15mm-0.4mm, and L can be 0.15mm, 0.17mm, 0.18mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, etc. The width W of the extension section 121 can be 0.1mm-0.3mm, and W can be 0.1mm, 0.12mm, 0.13mm, 0.15mm, 0.2mm, 0.25mm, 0.28mm, 0.3mm, etc.

[0100] Optionally, refer to Figure 1The edge bus electrode 11a is an edge cathode bus electrode, and the edge cathode bus electrode is in a wavy line shape.

[0101] Specifically, in one embodiment, Figure 1 As shown, when the edge negative bus electrode is designed to be in a wavy line shape, the problems of broken grid and virtual printing caused by the screen during screen printing can be reduced, and the printing quality of the edge negative bus electrode can be improved.

[0102] Optionally, refer to Figure 1 The intermediate negative bus electrode in the intermediate bus electrode 11b is in a wavy line shape.

[0103] Specifically, in one embodiment, Figure 1 As shown, when the intermediate negative bus electrode in the intermediate bus electrode 11b is designed to be in a wavy line shape, the problems of broken grid and virtual printing caused by the screen during screen printing can be reduced, and the printing quality of the intermediate negative bus electrode can be improved.

[0104] Optionally, refer to Figure 4 The cell further includes a connecting wire 14 , one end of which is electrically connected to the edge interconnection bar connecting portion 12 , and the other end of which is electrically connected to the edge bus electrode 11 a .

[0105] Specifically, in one embodiment, Figure 4 As shown, the edge interconnection bar connection portion 12 and the edge bus electrode 11a are electrically connected together through a connection line 14 arranged along the direction of the second edge 102, and the current collected by the edge bus electrode 11a can be transmitted to the edge interconnection bar connection portion 12, and then transmitted to the bus bar output by the interconnection bar.

[0106] Optionally, in one embodiment, the length of the connection line 14 is greater than 1.2 mm and less than 2.5 mm, and may be 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc. The length of the connection line 14 depends on the spacing m between the edge interconnection strip connection portion 12 and the edge bus electrode 11 a, and a span d7 of the edge interconnection strip connection portion 12 .

[0107] Optionally, in one embodiment, the width of the connecting wire 14 is greater than 0.1 mm and less than 0.6 mm, and may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, etc. The wider the width of the connecting wire 14, the stronger the current transmission capability is. However, when the connecting wire 14 is too wide, it is easy to block light and waste materials. Therefore, the width of the connecting wire 14 is greater than 0.1 mm and less than 0.6 mm.

[0108] Optionally, refer to Figure 4 , a distance d8 between the first side 101 and the side of the edge bus electrode 11 a away from the edge interconnection bar connecting portion 12 is greater than 0.32 mm and less than 0.5 mm.

[0109] Specifically, in one embodiment, Figure 4 As shown, a blank narrow edge is formed between the side of the edge bus electrode 11a away from the edge interconnection strip connection portion 12 and the first edge 101, and the width of this blank narrow edge is d8. When d8 is small (for example, less than 0.32mm), the edge bus electrode 11a is too close to the edge, and the risk of poor quality of the battery cell is greater. When d8 is large (for example, greater than 0.5mm), the edge bus electrode 11a is too far away from the edge, which can easily lead to a white edge that is too wide, resulting in a waste of battery cell area. Therefore, in the embodiment of the present application, 0.32mm≤d8≤0.5mm. For example, d8 can be 0.32mm, 0.35mm, 0.38mm, 0.4mm, 0.42mm, 0.48mm, 0.5mm, etc.

[0110] Optionally, along the direction of the first side 101, the size of the battery cell is greater than 94 mm and less than 106 mm;

[0111] Along the direction of the second side 102 , the size of the battery cell is greater than 177.2 mm and less than 187.2 mm.

[0112] Specifically, a battery cell that is too long is not conducive to process manufacturing, and a battery cell that is too short will result in a lower power cell. The battery cell of the embodiment of the present application can also be a whole battery cell that is cut into n-piece batteries. For example, when n is 2, it is a half-piece battery; when n is 3, it is a three-piece battery; when n is 4, it is a four-piece battery; when n is 8, it is an eight-piece battery. Therefore, according to the different length specifications of the whole battery, the size of the obtained n-piece battery in the direction of the first side 101 can be between 94mm and 106mm. For example, when a whole battery cell with a length of 188mm is cut to obtain a half-piece battery cell, the length of the battery cell can be 94mm. When a whole battery cell with a length of 192mm is cut to obtain a half-piece battery cell, the length of the battery cell can be 96mm. When a whole battery cell with a length of 212mm is cut to obtain a half-piece battery cell, the length of the battery cell can be 106mm. Therefore, the cell design of the present application can take into account both reducing the difficulty of the process and ensuring the power of the module, and facilitate the flexible layout of the cells in the photovoltaic module to obtain the target power and voltage.

[0113] In addition, the width of the n-piece battery can be 177.2 mm, 178.2 mm, 179.2 mm, 180.2 mm, 182.2 mm, 185.2 mm, 187.2 mm. For example, when a full-piece battery with a width of 182.2 mm is cut to obtain a half-piece battery, the width of the battery 10 remains unchanged at 182.2 mm.

[0114] Therefore, the above-mentioned solar cells of different specifications and sizes can provide more options for the manufacturing process of the photovoltaic module of the embodiment of the present application, and a rich variety of products can be prepared.

[0115] Optionally, in one embodiment, when the battery cell of the present application is a battery cell with a main grid, the aforementioned bus electrode 11 can be a main grid, and specifically can include a positive main grid and a negative main grid.

[0116] Optionally, in one embodiment, when the cell of the present application is a busbar-less cell, the bus electrode 11 may be a bus connection line processed on the surface of the substrate 10, which is used to collect the current at the edge of the cell.

[0117] The present application also provides a photovoltaic module, which includes a plurality of battery strings, and the battery string includes a plurality of any of the aforementioned battery cells, wherein the interconnection bar connection parts of the plurality of battery cells in the battery string are connected in series through an interconnection bar.

[0118] Specifically, the edge interconnection bar connection parts 12 and the middle interconnection bar connection parts 13 on multiple battery cells are connected together using different interconnection bars to form battery strings, and each battery string can be connected in parallel to form the photovoltaic module of the embodiment of the present application.

[0119] Optionally, the length of the photovoltaic module is greater than 2380 mm and less than 2384 mm. For example, the length may be 2380 mm, 2381 mm, 2382 mm, 2383 mm, or 2384 mm.

[0120] Optionally, the length of the photovoltaic module is greater than 1992 mm and less than 1996 mm. For example, the length may be 1992 mm, 1993 mm, 1994 mm, 1995 mm, or 1996 mm.

[0121] Optionally, the length of the photovoltaic module is greater than 1798 mm and less than 1802 mm. For example, the length may be 1798 mm, 1799 mm, 1780 mm, 1781 mm, or 1782 mm.

[0122] The convenience of transportation and installation of components that meet the above length dimensions is improved, and the appropriate length can also reduce the risk of wind uplift caused by the overall component size being too large, and avoid insufficient power generation caused by the overall component size being too small.

[0123] The embodiments of the present application also provide a photovoltaic system, which may use a plurality of photovoltaic modules as described in the aforementioned embodiments. The plurality of photovoltaic modules may be arranged in an array and installed on the roof of a building to form a distributed photovoltaic power generation system.

[0124] Specifically, the photovoltaic modules can be fixed to the building by using adhesive with strong adhesion and excellent weather resistance, or by using connectors such as a pressing block assembly used in conjunction with the photovoltaic module frame, or by using a hanger fastener used in conjunction with the photovoltaic module frame to mount the photovoltaic module on the wall of the building. The appropriate installation structure can be selected according to the actual construction conditions.

[0125] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0126] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A battery cell, characterized in that: include: A substrate having a first side and a second side perpendicular to each other; A plurality of bus electrodes, the bus electrodes are arranged on the surface of the substrate, the bus electrodes extend in the direction of the first edge, and are arranged at intervals in the direction of the second edge, the plurality of bus electrodes include two edge bus electrodes, and the two edge bus electrodes are respectively arranged adjacent to two of the first edges; The inner sides of the two edge bus electrodes away from the first side are each provided with a row of edge interconnection bar connection parts, and a plurality of rows of middle interconnection bar connection parts are provided between the two rows of edge interconnection bar connection parts; The edge interconnection strip connection portion is electrically connected to the edge bus electrode, and the spacing between the edge bus electrode and the edge interconnection strip connection portion is m; the spacing between the edge interconnection strip connection portion and the adjacent intermediate interconnection strip connection portion and the spacing between two adjacent columns of intermediate interconnection strip connection portions is n; the value of m is greater than 0.17n and less than 0.5n, and both m and n are greater than zero.

2. The battery cell according to claim 1, characterized in that: The plurality of bus electrodes further include a middle bus electrode, and the remaining bus electrodes between the two edge bus electrodes are the middle bus electrodes; The intermediate bus electrodes serve as a row of intermediate interconnection bar connection portions, or the intermediate bus electrodes are provided with the intermediate interconnection bar connection portions.

3. The battery cell according to claim 1, characterized in that: The value of m is greater than 0.18n and less than 0.3n; and / or, The size of m is greater than 1.8 mm and less than 3.5 mm; and / or, The size of n is greater than 8 mm and less than 13 mm.

4. The battery cell according to claim 1, characterized in that: The base also has a chamfered beveled edge connecting the first edge and the second edge; Along the extension direction of the second side, the distance between the edge interconnection strip connecting portion and the first side is greater than the distance between the end point of the second side and the first side.

5. The battery cell according to claim 1, characterized in that: Along the direction of the first side, the distance between the edge interconnection strip connecting portion close to the second side and the second side is greater than 5 mm and less than 9 mm; and / or, Along the direction where the first side is located, r edge interconnection strip connection portions are arranged at equal intervals, 6≤r≤10; and / or, Along the direction of the second side, the interconnection strip connection parts have 16-22 columns; and / or, Along the direction of the first side, s intermediate interconnection strip connecting portions are arranged at equal intervals, 6≤s≤10; and / or, Along the direction of the first side, the distance between two adjacent connecting portions of the interconnecting strips is greater than 10 mm and less than 13 mm, and / or, Along the direction of the second side, a distance between two adjacent interconnection strip connection portions is greater than 8 mm and less than 13 mm.

6. The battery cell according to claim 1, characterized in that: Along the direction of the first side, the span of the interconnection strip connection portion is greater than 1.5 mm and less than 2.2 mm; and / or, Along the direction of the second side, the span of the interconnection strip connection portion is greater than 1.1 mm and less than 1.8 mm; and / or, The edge interconnection bar connecting portion and the middle interconnection bar connecting portion are rectangular; and / or, The edge interconnection strip connecting portion has an extension section extending along the direction of the first edge, the length of the extension section is 0.15 mm-0.4 mm, and the width of the extension section is 0.1 mm-0.3 mm.

7. The battery cell according to claim 2, characterized in that: The edge bus electrode is an edge cathode bus electrode, and the edge cathode bus electrode is in a wavy line shape; and / or, The intermediate cathode bus electrode in the intermediate bus electrodes is in a wavy line shape.

8. The battery cell according to claim 1, characterized in that: The battery cell further comprises a connecting wire, one end of which is electrically connected to the edge interconnection bar connecting portion, and the other end of which is electrically connected to the edge bus electrode; The length of the connecting line is greater than 1.2 mm and less than 2.5 mm; and / or, The width of the connecting line is greater than 0.1 mm and less than 0.6 mm.

9. The battery cell according to claim 1, characterized in that: A distance between a side of the edge bus electrode away from the edge interconnection bar connection portion and the first side is greater than 0.32 mm and less than 0.5 mm.

10. The battery cell according to claim 1, characterized in that: Along the direction of the first side, the size of the battery cell is greater than 94 mm and less than 106 mm; Along the direction of the second side, the size of the battery cell is greater than 177.2 mm and less than 187.2 mm.

11. The battery cell according to claim 1, characterized in that: The busbar electrode is a main grid, and the cell is a main grid cell; or, The busbar electrode is a busbar connection line, and the battery cell is a busbar-free battery cell.

12. A photovoltaic module, characterized in that: The photovoltaic assembly comprises a plurality of battery strings, and the battery string comprises a plurality of battery cells according to any one of claims 1 to 11, wherein interconnection bar connection portions of the plurality of battery cells in the battery string are connected in series via an interconnection bar.

13. The photovoltaic module according to claim 12, characterized in that: The length of the photovoltaic module is greater than 2380 mm and less than 2384 mm; or, The length of the photovoltaic module is greater than 1992 mm and less than 1996 mm; or, The length of the photovoltaic module is greater than 1798 mm and less than 1802 mm.

14. A photovoltaic system, characterized in that: A plurality of photovoltaic modules according to claim 12 or 13 arranged in an array.

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