A three-split battery assembly and photovoltaic system

Abstract

This invention relates to the field of photovoltaic technology and provides a three-cell solar module and photovoltaic system. The three-cell solar module includes: a plurality of first cell strings and a plurality of second cell strings; the first cell strings and second cell strings are arranged in an overlapping manner along a first direction; the end cells of the first cell strings overlap with the beginning cells of the second cell strings, and neither the end cells of the first cell strings nor the beginning cells of the second cell strings have chamfers. When they overlap along the first direction, their edges can achieve a seamless or near-seamless fit. This allows the effective light-absorbing material of the cells to achieve continuous coverage in the overlapping area, eliminating optical dead zones and maximizing the utilization of every inch of the light-receiving surface of the module, converting more solar energy into electrical energy, and ultimately improving the overall output power and efficiency of the module.

Description

Technical Field

[0001] This invention relates to three-cell solar cell modules and photovoltaic systems, and more particularly to a three-cell solar cell module and photovoltaic system. Background Technology

[0002] In traditional solar cell manufacturing, chamfers are applied to all four corners to prevent stress concentration and damage. The cell is then further divided into multiple segments (two or more), with at least two of these segments having chamfers. This process removes effective light-absorbing material from the chamfered areas, creating inherent "optical dead zones" that cannot generate electricity. When multiple cells are sequentially assembled into a complete module, these chamfer gaps, created to accommodate the manufacturing process, accumulate inside the module, forming non-power-generating blank spaces. This not only directly reduces the effective area of ​​the module's light-receiving surface, causing incident sunlight to be wasted in these areas, but also limits further increases in module power output. Summary of the Invention

[0003] This invention provides a three-cell solar cell module and photovoltaic system, aiming to solve the problem of optical dead zones restricting power output.

[0004] The present invention is implemented as follows: a three-cell battery assembly includes: a plurality of first battery strings and a plurality of second battery strings; The first battery string and the second battery string are arranged in an overlapping manner along a first direction; The end cell of the first battery string overlaps with the beginning cell of the second battery string, and neither the end cell of the first battery string nor the beginning cell of the second battery string has a chamfer.

[0005] Optionally, each of the first battery strings includes a plurality of first repeating battery cell groups and a group of first end battery cell groups, the plurality of first repeating battery cell groups are arranged sequentially along the first direction, and the first end battery cell groups are located at the very end of the first battery string. The first repeating battery cell group and the first terminal battery cell group each include a first battery cell, a second battery cell and a third battery cell. The first battery cell has a first chamfered edge and a first right-angled edge that are arranged opposite to each other. The first chamfered edge has two chamfers that are arranged opposite to each other. The second battery cell has two oppositely arranged second right-angled sides; The third battery cell has a third chamfered edge and a third right-angled edge arranged opposite to each other, and the third chamfered edge has two chamfers arranged opposite to each other; The first repeating battery cell group includes a first battery cell, a second battery cell, and a third battery cell arranged in a sequentially overlapping manner along the first direction, wherein the first chamfered edge overlaps with one of the second right-angled edges, and the other second right-angled edge overlaps with the third right-angled edge; or, the first repeating battery cell group includes a first battery cell, a third battery cell, and a second battery cell arranged in a sequentially overlapping manner along the first direction, wherein the first chamfered edge overlaps with the third right-angled edge, and the third chamfered edge overlaps with the second right-angled edge. The first terminal battery cell group includes a first battery cell, a third battery cell, and a second battery cell arranged sequentially along the first direction, wherein the first chamfered edge overlaps with the third right-angled edge, and the third chamfered edge overlaps with the second right-angled edge; The projected size of the chamfer in the first direction is less than or equal to the overlap width of two adjacent cells in the first battery string.

[0006] Optionally, when viewed from the backlight side of the three-cell battery assembly, when the first repeating battery cell group includes the first battery cell, the second battery cell, and the third battery cell arranged in a sequentially overlapping manner along the first direction, in the first repeating battery cell group, the second battery cell is stacked on top of the first battery cell, and the third battery cell is stacked on top of the second battery cell. In the first terminal battery cell group, the third battery cell is stacked on top of the first battery cell, and the second battery cell is stacked on top of the third battery cell.

[0007] Optionally, when viewed from the backlight side of the three-cell battery assembly, when the first repeating battery cell group includes the first battery cell, the third battery cell, and the second battery cell arranged sequentially along the first direction, in the first repeating battery cell group, the third battery cell is stacked on top of the first battery cell, and the second battery cell is stacked on top of the third battery cell. In the first terminal battery cell group, the third battery cell is stacked on top of the first battery cell, and the second battery cell is stacked on top of the third battery cell.

[0008] Optionally, each second battery string includes a plurality of second repeating battery cell groups and a group of second first-end battery cell groups, the plurality of second repeating battery cell groups are arranged sequentially along the first direction, and the second first-end battery cell groups are located at the very beginning of the first battery string; Both the second repeating battery cell group and the second first-end battery cell group include the first battery cell, the second battery cell, and the third battery cell, respectively; The second repeating battery cell group includes the third battery cell, the second battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, wherein the third right-angled side overlaps with one of the second right-angled sides, and the other second right-angled side overlaps with the first right-angled side; or, the second repeating battery cell group includes the second battery cell, the third battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, wherein the second right-angled side overlaps with the third chamfered side, and the third right-angled side overlaps with the first chamfered side. The second first-end battery cell group includes a second battery cell, a third battery cell, and a first battery cell arranged sequentially along the first direction, wherein the second right-angled side overlaps with the third chamfered side, and the third right-angled side overlaps with the first chamfered side; The projected size of the chamfer in the first direction is less than or equal to the overlap width of two adjacent cells in the second battery string.

[0009] Optionally, when viewed from the backlight side of the three-cell battery assembly, when the second repeating battery cell group includes the third battery cell, the second battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, in the second repeating battery cell group, the second battery cell is stacked on top of the third battery cell, and the first battery cell is stacked on top of the second battery cell; In the second first-end battery cell group, the third battery cell is stacked on top of the second battery cell, and the first battery cell is stacked on top of the third battery cell.

[0010] Optionally, when viewed from the backlight side of the three-cell battery assembly, when the second repeating battery cell group includes the third battery cell, the second battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, in the second repeating battery cell group, the third battery cell is stacked on top of the second battery cell, and the second battery cell is stacked on top of the first battery cell. In the second first-end battery cell group, the second battery cell is stacked on top of the third battery cell, and the third battery cell is stacked on top of the first battery cell.

[0011] Optionally, when viewed from the backlight side of the three-cell battery assembly, when the second repeating battery cell group includes the second battery cell, the third battery cell, and the first battery cell arranged sequentially along the first direction, in the second repeating battery cell group, the third battery cell is stacked on top of the second battery cell, and the first battery cell is stacked on top of the third battery cell; In the second first-end battery cell group, the third battery cell is stacked on top of the second battery cell, and the first battery cell is stacked on top of the third battery cell.

[0012] Optionally, when viewed from the backlight side of the three-cell battery assembly, when the second repeating battery cell group includes the second battery cell, the third battery cell, and the first battery cell arranged sequentially along the first direction, in the second repeating battery cell group, the second battery cell is stacked on top of the third battery cell, and the third battery cell is stacked on top of the first battery cell; In the second first-end battery cell group, the second battery cell is stacked on top of the third battery cell, and the third battery cell is stacked on top of the first battery cell.

[0013] Optionally, the chamfer is a 25° to 75° angle.

[0014] Optionally, the overlap width of two adjacent battery cells along the first direction is 0.85±0.4cm.

[0015] Optionally, a plurality of the first battery strings are arranged sequentially along the second direction, and a plurality of the second battery strings are arranged sequentially along the second direction, wherein the second direction intersects the first direction.

[0016] The present invention also provides a photovoltaic system including the above-described three-cell battery module.

[0017] The beneficial effects achieved by this invention are as follows: Since neither the end cell of the first battery string nor the beginning cell of the second battery string has a chamfer when they overlap, the edges of these two cells used for overlapping are right angles or at least completely straight edges. When they overlap along the first direction, their edges can achieve a seamless or near-seamless fit. This allows the effective light-absorbing material of the cells to achieve continuous coverage in the overlapping area, eliminating optical dead zones and filling in areas that would otherwise not generate electricity. This maximizes the utilization of every inch of the module's light-receiving surface, converting more solar energy into electrical energy, ultimately improving the overall output power and efficiency of the module. Attached Figure Description

[0018] Figure 1 This is a top view schematic diagram of the first backlight surface structure of the three-cell battery assembly provided by the present invention; Figure 2 This is a top view schematic diagram of the second backlight surface structure of the three-cell battery assembly provided by the present invention; Figure 3 This is a top view schematic diagram of the third backlight surface structure of the three-cell battery assembly provided by the present invention; Figure 4 This is a top view schematic diagram of the fourth backlight surface structure of the three-cell battery assembly provided by the present invention; Figure 5 This is a side view of the first battery string structure. Figure 6 This is a schematic diagram of another side view of the first battery string structure; Figure 7 This is a schematic diagram of the first side view structure of the second battery string; Figure 8 This is a schematic diagram of the second side view structure of the second battery string; Figure 9 This is a schematic diagram of the third side view structure of the second battery string; Figure 10 This is a schematic diagram of the fourth side view structure of the second battery string; Figure 11 This is a side view of the overlapping area of ​​the first and second battery strings, viewed from a second direction. Figure 12 This is a schematic diagram of another side view of the overlapping area of ​​the first and second battery strings from a second direction.

[0019] Explanation of reference numerals in the attached figures: 100. Three-cell battery assembly; 110. Battery cell; 111. First battery cell; 112. Second battery cell; 113. Third battery cell; 120. First battery string; 121. First repeating battery cell group; 122. First end battery cell group; 130. Second battery string; 131. Second repeating battery cell group; 122. Second beginning battery cell group. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] This invention ensures that neither the end cell of the first battery string nor the beginning cell of the second battery string has a chamfer when they overlap. This means that the edges of these two cells used for overlapping are right angles or at least completely straight edges. When they overlap along a first direction, their edges can achieve a seamless or near-seamless fit. This allows the effective light-absorbing material of the cells to be continuously covered in the overlapping area, eliminating optical dead zones and filling in areas that would otherwise not generate electricity. This maximizes the utilization of every inch of the module's light-receiving surface, converting more solar energy into electrical energy, ultimately improving the overall output power and efficiency of the module.

[0027] Example 1 like Figure 1 and Figure 4 As shown, this embodiment provides a three-cell battery assembly 100, including: a plurality of first battery strings 120 and a plurality of second battery strings 130; the first battery strings 120 and the second battery strings 130 are arranged in an overlapping manner along a first direction; the end battery cells of the first battery strings 120 overlap with the beginning battery cells of the second battery strings 130, and neither the end battery cells of the first battery strings 120 nor the beginning battery cells of the second battery strings 130 have chamfers.

[0028] Typically, a battery module is arranged with several battery cells 110 arranged in several rows. Each row includes two battery strings, namely a first battery string 120 and a second battery string 130. Each battery string contains several battery cells 110, and the battery cells 110 in each battery string are arranged overlappingly along a first direction. For example, the first direction is a horizontal direction on a horizontal plane. The arrangement direction of the battery cells 110 in the first battery string 120 and the second battery string 130 in a single row can be the same or different. Specifically, viewed from the backlight side of the three-cell battery module 100, the battery cells 110 in the first battery string 120 can be arranged sequentially from left to right in a horizontal direction, and the battery cells 110 in the second battery string 130 can be arranged sequentially from left to right in a horizontal direction, such as... Figure 1 , Figure 2 and Figure 11 As shown; alternatively, the battery cells 110 in the first battery string 120 can be arranged sequentially from left to right in a horizontal direction, and the battery cells 110 in the second battery string 130 can be arranged sequentially from right to left in a horizontal direction, as shown. Figure 3 , Figure 4 and Figure 12 As shown. Specifically, the three-part battery can be a back contact battery cell.

[0029] To improve module power and efficiency, the battery strings in a single row are typically interconnected by overlapping to reduce or eliminate electrical connection gaps between strings, thereby increasing the effective light-receiving area. Specifically, the last cell of a battery string (i.e., the last cell 110 assembled in the string; for example, if the cells 110 in the string are arranged from left to right, then the rightmost cell 110 is the last cell) partially overlaps with the first cell of the adjacent battery string (i.e., the first cell 110 assembled in the string; for example, if the cells 110 in the string are arranged from left to right, then the leftmost cell 110 is the first cell).

[0030] The three-cell solar module 100 comprises several three-cell modules. A three-cell module is created by laser-cutting a standard-sized complete solar cell into three narrower cells along the direction of the fine grid lines. After cutting, the operating current of each cell (segment) is approximately reduced to one-third of the original cell, while the operating voltage remains essentially unchanged. Typically, a complete solar cell is rectangular. During processing, to prevent stress concentration at the apex and subsequent breakage, chamfers are placed at the four corners of the rectangle. After the complete solar cell is processed, it is then segmented. Understandably, by cutting the complete solar cell into three cells along the direction of the fine grid lines, the two outermost segments each have two chamfers, while the middle segment does not have a chamfer.

[0031] A complete solar cell can be divided into three sections, which are considered as a group of 110 cells. When arranging several sections, all three sections within a group of 110 cells must be arranged before arranging the sections within another group of 110 cells. The arrangement of the three sections within a group of 110 cells can be adjusted and is not limited.

[0032] Specifically, a group of battery cells 110 includes a first battery cell 111, a second battery cell 112, and a third battery cell 113. The first battery cell 111 has a first chamfered edge and a first right-angled edge that are arranged opposite each other, and the first chamfered edge has two chamfers that are arranged opposite each other. The second battery cell 112 has two second right-angled edges that are arranged opposite each other. The third battery cell 113 has a third chamfered edge and a third right-angled edge that are arranged opposite each other, and the third chamfered edge has two chamfers that are arranged opposite each other.

[0033] Neither the end cell of the first battery string 120 nor the beginning cell of the second battery string 130 has a chamfer; that is, both the end cell of the first battery string 120 and the beginning cell of the second battery string 130 are second cell 112. If either the end cell of the first battery string 120 or the beginning cell of the second battery string 130 is a first cell 111 or a third cell 113, there may be a small gap at the overlap of the two battery strings that cannot be covered by the battery material. Although this area is filled by encapsulation material (such as EVA or backplate), it does not generate current and is therefore an "optical dead zone," which directly reduces the light absorption and conversion efficiency of this local area.

[0034] In this application, neither the end cell of the first cell string 120 nor the beginning cell of the second cell string 130 has a chamfer when they overlap. This means that the edges of the two cells 110 used for overlapping are right angles or at least complete straight edges. When they overlap precisely along a first direction (typically the length direction of the cell string), their edges can achieve a seamless or near-seamless fit. This allows the effective light-absorbing material (silicon wafer) of the cell 110 to achieve continuous coverage in the overlapping area, eliminating optical dead zones and filling in blank areas that would otherwise not generate electricity. This maximizes the utilization of every inch of the module's light-receiving surface, converting more solar energy into electrical energy, ultimately improving the overall output power and efficiency of the module.

[0035] In some embodiments, each first battery string 120 includes a plurality of first repeating battery cell groups 121 and a group of first end battery cell groups 122. The plurality of first repeating battery cell groups 121 are arranged sequentially along a first direction, and the first end battery cell groups 122 are disposed at the very end of the first battery string 120. The first repeating battery cell group 121 and the first terminal battery cell group 122 each include a first battery cell 111, a second battery cell 112 and a third battery cell 113, respectively. The first repeating battery cell group 121 includes a first battery cell 111, a second battery cell 112, and a third battery cell 113 arranged in a first direction, overlapping each other. The first chamfered edge overlaps with a second right-angled edge, and the other second right-angled edge overlaps with a third right-angled edge. Alternatively, the first repeating battery cell group 121 includes a first battery cell 111, a third battery cell 113, and a second battery cell 112 arranged in a first direction, overlapping each other. The first chamfered edge overlaps with the third right-angled edge, and the third chamfered edge overlaps with the second right-angled edge. The first terminal battery cell group 122 includes a first battery cell 111, a third battery cell 113 and a second battery cell 112 arranged sequentially along a first direction, with the first chamfered edge overlapping the third right-angled edge and the third chamfered edge overlapping the second right-angled edge. The projected size of the chamfer in the first direction is less than or equal to the overlap width of two adjacent battery cells 110 in the first battery string 120.

[0036] Each first battery string 120 comprises N "first repeating battery cell groups 121" and one "first end battery cell group 122" connected in series along a first direction (length direction). The first repeating battery cell group 121 is a periodic repeating unit, while the first end battery cell group 122 is the end point of the battery string, preparing for chamfer-free docking with adjacent battery strings. For example, if the "first repeating battery cell group 121" is denoted as X and the "first end battery cell group 122" is denoted as Y, then the first battery string 120 is "XXXX…XY".

[0037] The first solar cell 111, the second solar cell 112, and the third solar cell 113 are obtained by cutting a whole solar cell. The first solar cell 111 and the third solar cell 113 are approximately rectangular in shape and each has two adjacent chamfers. The second solar cell 112 is rectangular in shape and does not have chamfers. Let the first solar cell 111 be denoted as A, the second solar cell 112 as B, and the third solar cell 113 as C. Then the arrangement of solar cells 110 in the first repeating solar cell group 121 is "ABC" or "ACB", and the arrangement of solar cells 110 in the first terminal solar cell group 122 is "ACB".

[0038] Specifically, when the cells 110 in the first repeating cell group 121 are arranged in an ABC pattern, the chamfered edge of the first cell 111 (A) overlaps with one right-angled edge of the second cell 112 (B), and the other right-angled edge of the second cell 112 (B) overlaps with the right-angled edge of the third cell 113 (C). Furthermore, from the backlight surface of the three-cell battery assembly 100 (… Figures 5 to 12 (The side of the three-cell battery module 100 facing upwards is the side facing away from sunlight, which will not be described in detail later.) It can be seen that the second cell 112(B) is stacked on top of the first cell 111(A), and the third cell 113(C) is stacked on top of the second cell 112(B) (as shown). Figure 5 As shown, the cells are arranged in overlapping patterns from left to right. Understandably, the back side of the three-cell battery module 100 is the side that faces away from sunlight.

[0039] When the cells 110 in the first repeating cell group 121 are arranged in an ACB configuration, the chamfered edge of the first cell 111(A) overlaps with the right-angled edge of the third cell 113(C), and the chamfered edge of the third cell 113(C) overlaps with one right-angled edge of the second cell 112(B). Furthermore, viewed from the backlight of the three-cell battery assembly 100, the third cell 113(C) can be stacked on top of the first cell 111(A), and the second cell 112(B) can be stacked on top of the third cell 113(C) (as shown). Figure 6 As shown, they are arranged in overlapping patterns from left to right.

[0040] Within the first terminal cell group 122, the cells 110 are arranged in an ACB configuration. The chamfered edge of the first cell 111(A) overlaps with the right-angled edge of the third cell 113(C), and the chamfered edge of the third cell 113(C) overlaps with one right-angled edge of the second cell 112(B). Furthermore, viewed from the backlight side of the three-cell battery assembly 100, the third cell 113(C) can be stacked on top of the first cell 111(A), and the second cell 112(B) can be stacked on top of the third cell 113(C) (as shown). Figure 5 and Figure 6 As shown, the cells are arranged in overlapping patterns from left to right. The second cell 112(B) has two right-angled edges, one of which overlaps with the chamfered edge of the third cell 113(C) within the group. The remaining right-angled edge then becomes the edge of the "end cell" of the entire first cell string 120, which overlaps with the first cell of the second cell string 130. When these two cell strings overlap, a seamless "right-angled edge to right-angled edge" connection is achieved, eliminating optical losses caused by chamfered gaps between cell strings.

[0041] In the first battery string 120, the chamfered edges of all battery cells 110 face the same direction. The projected size of the chamfer in the first direction is less than or equal to the overlap width to ensure that, within the first battery string 120, the chamfered portions of the first battery cell 111 and the third battery cell 113, after overlapping, can be covered by the effective area of ​​the adjacent battery cell 110. When viewed from the backlight side of the three-cell battery assembly 100, the chamfers are hidden below the overlapping area of ​​the battery cells 110 as much as possible, so that a continuous and complete battery surface is presented to the outside, thereby increasing the light-receiving area.

[0042] In some embodiments, each second battery string 130 includes a plurality of second repeating battery cell groups 131 and a group of second first-end battery cell groups 132. The plurality of second repeating battery cell groups 131 are arranged sequentially along a first direction, and the second first-end battery cell groups 132 are disposed at the first end of the first battery string 120. The second repeating battery cell group 131 and the second first-end battery cell group 132 each include a first battery cell 111, a second battery cell 112 and a third battery cell 113, respectively. The second repeating battery cell group 131 includes a third battery cell 113, a second battery cell 112 and a first battery cell 111 arranged in a first direction, overlapping each other. The third right-angled side overlaps with one second right-angled side, and the other second right-angled side overlaps with the first chamfered side. Alternatively, the second repeating battery cell group 131 includes a second battery cell 112, a third battery cell 113 and a first battery cell 111 arranged in a first direction, overlapping each other. The second right-angled side overlaps with the third chamfered side, and the third right-angled side overlaps with the first chamfered side. The second end battery cell group 132 includes a second battery cell 112, a third battery cell 113 and a first battery cell 111 arranged sequentially along the first direction, with the second right-angled side overlapping the third chamfered side and the third right-angled side overlapping the first chamfered side; The projected size of the chamfer in the first direction is less than or equal to the overlap width of two adjacent battery cells 110 in the second battery string 130.

[0043] The arrangement of the battery cells 110 in the second battery string 130 is symmetrical to the arrangement of the battery cells 110 in the first battery string 120. Each second battery string 130 consists of one "second starting battery cell group 132" and N "second repeating battery cell groups 131" connected in series along a first direction. The second repeating battery cell group 131 is a periodic repeating unit, while the second starting battery cell group 132 is the starting point of the battery string, preparing for chamfer-free docking with adjacent battery strings. For example, if the "second repeating battery cell group 131" is denoted as X and the "second starting battery cell group 132" is denoted as Y, then the second battery string 130 is "YX…XXXX".

[0044] As before, the first battery cell 111 is denoted as A, the second battery cell 112 as B, and the third battery cell 113 as C. Then, the arrangement of the battery cells 110 in the second repeating battery cell group 131 is "CBA" or "BCA", and the arrangement of the battery cells 110 in the second first-end battery cell group 132 is "BCA".

[0045] Specifically, when the cells 110 in the second repeating cell group 131 are arranged in a CBA configuration, the chamfered edge of the third cell 113(C) overlaps with one right-angled edge of the second cell 112(B), and the other right-angled edge of the second cell 112(B) overlaps with the right-angled edge of the first cell 111(A). Furthermore, viewed from the backlight side of the three-cell battery assembly 100, the second cell 112(B) can be stacked on top of the third cell 113(C), and the first cell 111(A) can be stacked on top of the second cell 112(B) (as shown). Figure 7 As shown, the cells are arranged in an overlapping manner from left to right; alternatively, the third cell 113(C) can be stacked on top of the second cell 112(B), and the second cell 112(B) can be stacked on top of the first cell 111(A) (as shown). Figure 8As shown, they are arranged in overlapping patterns from right to left.

[0046] When the cells 110 in the second repeating cell group 131 are arranged in a BCA configuration, the right-angled side of the second cell 112(B) overlaps with the chamfered side of the third cell 113(C), and the right-angled side of the third cell 113(C) then overlaps with the chamfered side of the first cell 111(A). Furthermore, viewed from the backlight side of the three-cell battery assembly 100, the third cell 113(C) can be stacked on top of the second cell 112(B), and the first cell 111(A) can be stacked on top of the third cell 113(C) (as shown). Figure 9 As shown, the cells are arranged in an overlapping manner from left to right; alternatively, the second cell 112(B) can be stacked on top of the third cell 113(C), and the third cell 113(C) can be stacked on top of the first cell 111(A) (as shown). Figure 10 As shown, they are arranged in overlapping patterns from right to left.

[0047] When the cells 110 in the second terminal cell group 132 are arranged in a BCA configuration, the right-angled side of the second cell 112(B) overlaps with the chamfered side of the third cell 113(C), and the right-angled side of the third cell 113(C) then overlaps with the chamfered side of the first cell 111(A). Furthermore, viewed from the backlight side of the three-cell battery assembly 100, the third cell 113(C) can be stacked on top of the second cell 112(B), and the first cell 111(A) can be stacked on top of the third cell 113(C) (as shown). Figure 7 and Figure 9 As shown, the cells are arranged in an overlapping manner from left to right; alternatively, the second cell 112(B) can be stacked on top of the third cell 113(C), and the third cell 113(C) can be stacked on top of the first cell 111(A) (as shown). Figure 8 and Figure 10 As shown, the cells are arranged in overlapping patterns from right to left. The second cell 112(B) has two right-angled edges, one of which overlaps with the chamfered edge of the third cell 113(C) within the group. The remaining right-angled edge then becomes the edge of the "end cell" of the entire first cell string 120, overlapping with the end cell of the first cell string 120. When these two cell strings overlap, a seamless "right-angled edge to right-angled edge" connection is achieved, eliminating optical losses caused by chamfered gaps between cell strings.

[0048] In the second battery string 130, the chamfered edges of all the battery cells 110 face the same direction, opposite to the direction of the chamfered edges of the battery cells 110 in the first battery string 120. The projected size of the chamfer in the first direction is less than or equal to the overlap width to ensure that, within the first battery string 120, the chamfered portions of the first battery cell 111 and the third battery cell 113, after overlapping, can be covered by the effective area of ​​the adjacent battery cell 110. When viewed from the backlight side of the three-cell battery assembly 100, all chamfers are hidden below the overlapping area of ​​the battery cells 110 as much as possible, so that a continuous and complete battery surface is presented to the outside, increasing the light-receiving area.

[0049] In some embodiments, the chamfer is 25° to 75°, that is, the chamfer on the first battery cell 111 and the third battery cell 113 is 25° to 75°. Specifically, it can be 30°, 45°, 60°, etc., or other values ​​within 25° to 75°, which are not limited here.

[0050] The chamfer is formed during the processing of the entire solar cell 110. One of its core functions is to release the mechanical stress concentration generated during the processing of the entire solar cell 110, preventing cracks from starting at the edges and corners and causing fragmentation. If the angle is too small (e.g., <25°), the chamfer is close to a sharp point, and its stress release effect is weak, almost equivalent to a right angle, and cannot effectively prevent edge chipping and crack propagation. If the angle is too large (e.g., >75°), the chamfer is close to a gentle arc. Although it helps to release stress in a single cell 110, its projected size in the first direction will increase dramatically. In order to cover this large projection when overlapping, the overlap width of adjacent cells 110 must be greatly increased. This will unnecessarily sacrifice the effective power generation area of ​​the cell 110 itself, offsetting the gain brought by eliminating inter-string gaps.

[0051] In some embodiments, the overlap width between two adjacent solar cells 110 along the first direction is 0.85 ± 0.4 mm, that is, the overlap width is in the range of 0.45 mm to 1.25 mm, specifically 0.45 mm, 0.55 mm, 0.65 mm, 0.75 mm, 0.85 mm, 0.95 mm, 1.05 mm, 1.15 mm, 1.25 mm, or other values ​​within the range of 0.45 mm to 1.25 mm. If the width is too small (<0.45 mm), the stacking of two adjacent solar cells 110 is unstable and cannot resist vibrations during transportation and use. The overlap area itself does not generate electricity, and if the width is too large (>1.25 mm), it will unnecessarily increase the ineffective area and reduce the overall power density of the module.

[0052] In some embodiments, a plurality of first battery strings 120 are arranged sequentially along a second direction, and a plurality of second battery strings 130 are arranged sequentially along a second direction, the second direction intersecting the first direction.

[0053] Specifically, a plurality of first battery strings 120 are arranged sequentially along a second direction, and a plurality of second battery strings 130 are arranged sequentially along a second direction. The second direction intersects with the first direction, and is usually perpendicular to the first direction. Figures 1 to 4 As shown, six strings of first-stage battery cells 120 are arranged in rows one through six, forming one array; six strings of second-stage battery cells 130 are also arranged in rows one through six, forming another array, with the two arrays side by side. In this way, the battery cells 110 within the three-cell battery module 100 are arranged in a regular array. The subsequent busbar arrangement ensures a clear busbar layout, suitable for automated welding and lamination processes, and represents an industrial standard design.

[0054] The three-cell solar module 100 may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulant film (not shown in the figures). The encapsulant film can be filled between the light-facing side of the solar cell and the photovoltaic glass, the back-facing side and the backsheet, and adjacent solar cells 110, etc. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulant film can be EVA film or POE film, and the specific choice can be made according to the actual situation, without limitation.

[0055] Photovoltaic glass can be applied to the encapsulating film on the light-facing side of a solar cell. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cell while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell together, providing sealing, insulation, and waterproofing / moisture protection for the solar cell.

[0056] The backsheet can be attached to the encapsulant film on the back side of the solar cell. The backsheet protects and supports the solar cell, providing reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, and aluminum alloy TPT composite encapsulant film, etc. The specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cells, encapsulant film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire three-cell solar module 100, providing stable support and installation. For example, the three-cell solar module 100 can be installed at the desired location using the metal frame.

[0057] The beneficial effects of the three-cell battery module 100 in this embodiment are equivalent to the beneficial effects of the solar cell described above, and will not be repeated here.

[0058] Example 2 This embodiment provides a photovoltaic system, including the three-cell battery module 100 described above.

[0059] Photovoltaic systems can be applied in photovoltaic power plants, such as ground-mounted, rooftop, and floating power plants, as well as in equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it's understandable that the application scenarios of photovoltaic systems are not limited to these; that is, photovoltaic systems can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system grid as an example, a photovoltaic system can include photovoltaic arrays, combiner boxes, and inverters. The photovoltaic array can be an array combination of multiple three-cell battery modules 100. For example, multiple three-cell battery modules 100 can form multiple photovoltaic arrays. The photovoltaic arrays are connected to combiner boxes, which can collect the current generated by the photovoltaic arrays. The collected current flows through an inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0060] The beneficial effects of the photovoltaic system in this embodiment are equivalent to those of the three-cell battery module 100 described above, and will not be repeated here.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A three-cell battery assembly, characterized in that, include: Several first battery strings and several second battery strings; The first battery string and the second battery string are arranged in an overlapping manner along a first direction; The end cell of the first battery string overlaps with the beginning cell of the second battery string, and neither the end cell of the first battery string nor the beginning cell of the second battery string has a chamfer.

2. The three-cell battery assembly as described in claim 1, characterized in that, Each first battery string includes a plurality of first repeating battery cell groups and a group of first end battery cell groups. The plurality of first repeating battery cell groups are arranged sequentially along the first direction, and the first end battery cell groups are located at the very end of the first battery string. The first repeating battery cell group and the first terminal battery cell group each include a first battery cell, a second battery cell and a third battery cell. The first battery cell has a first chamfered edge and a first right-angled edge that are arranged opposite to each other. The first chamfered edge has two chamfers that are arranged opposite to each other. The second battery cell has two oppositely arranged second right-angled sides; The third battery cell has a third chamfered edge and a third right-angled edge arranged opposite to each other, and the third chamfered edge has two chamfers arranged opposite to each other; The first repeating battery cell group includes a first battery cell, a second battery cell, and a third battery cell arranged in a sequentially overlapping manner along the first direction. The first chamfered edge overlaps with one of the second right-angled edges, and the other second right-angled edge overlaps with the third right-angled edge. Alternatively, the first repeating battery cell group includes a first battery cell, a third battery cell, and a second battery cell arranged in a sequentially overlapping manner along the first direction. The first chamfered edge overlaps with the third right-angled edge, and the third chamfered edge overlaps with the second right-angled edge. The first terminal battery cell group includes a first battery cell, a third battery cell, and a second battery cell arranged sequentially along the first direction, wherein the first chamfered edge overlaps with the third right-angled edge, and the third chamfered edge overlaps with the second right-angled edge; The projected size of the chamfer in the first direction is less than or equal to the overlap width of two adjacent cells in the first battery string.

3. The three-cell battery assembly as described in claim 2, characterized in that, Viewed from the back of the three-cell battery assembly, when the first repeating battery cell group includes the first battery cell, the second battery cell, and the third battery cell arranged in a sequentially overlapping manner along the first direction, in the first repeating battery cell group, the second battery cell is stacked on top of the first battery cell, and the third battery cell is stacked on top of the second battery cell. In the first terminal battery cell group, the third battery cell is stacked on top of the first battery cell, and the second battery cell is stacked on top of the third battery cell.

4. The three-cell battery assembly as described in claim 2, characterized in that, Viewed from the back of the three-cell battery assembly, when the first repeating battery cell group includes the first battery cell, the third battery cell, and the second battery cell arranged sequentially along the first direction, in the first repeating battery cell group, the third battery cell is stacked on top of the first battery cell, and the second battery cell is stacked on top of the third battery cell. In the first terminal battery cell group, the third battery cell is stacked on top of the first battery cell, and the second battery cell is stacked on top of the third battery cell.

5. The three-cell battery assembly as described in claim 2, characterized in that, Each second battery string includes several second repeating battery cell groups and a second first-end battery cell group. The several second repeating battery cell groups are arranged sequentially along a first direction, and the second first-end battery cell group is located at the very beginning of the first battery string. Both the second repeating battery cell group and the second first-end battery cell group include the first battery cell, the second battery cell, and the third battery cell, respectively; The second repeating battery cell group includes the third battery cell, the second battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, wherein the third right-angled side overlaps with one of the second right-angled sides, and the other second right-angled side overlaps with the first right-angled side; or, the second repeating battery cell group includes the second battery cell, the third battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, wherein the second right-angled side overlaps with the third chamfered side, and the third right-angled side overlaps with the first chamfered side. The second first-end battery cell group includes a second battery cell, a third battery cell, and a first battery cell arranged sequentially along the first direction, wherein the second right-angled side overlaps with the third chamfered side, and the third right-angled side overlaps with the first chamfered side; The projected size of the chamfer in the first direction is less than or equal to the overlap width of two adjacent cells in the second battery string.

6. The three-cell battery assembly as described in claim 5, characterized in that, Viewed from the back of the three-cell battery assembly, when the second repeating battery cell group includes the third battery cell, the second battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, in the second repeating battery cell group, the second battery cell is stacked on top of the third battery cell, and the first battery cell is stacked on top of the second battery cell. In the second first-end battery cell group, the third battery cell is stacked on top of the second battery cell, and the first battery cell is stacked on top of the third battery cell.

7. The three-cell battery assembly as described in claim 5, characterized in that, Viewed from the back of the three-cell battery assembly, when the second repeating battery cell group includes the third battery cell, the second battery cell, and the first battery cell arranged in a sequentially overlapping manner along the first direction, in the second repeating battery cell group, the third battery cell is stacked on top of the second battery cell, and the second battery cell is stacked on top of the first battery cell. In the second first-end battery cell group, the second battery cell is stacked on top of the third battery cell, and the third battery cell is stacked on top of the first battery cell.

8. The three-cell battery assembly as described in claim 5, characterized in that, Viewed from the back of the three-cell battery assembly, when the second repeating battery cell group includes the second battery cell, the third battery cell, and the first battery cell arranged sequentially along the first direction, in the second repeating battery cell group, the third battery cell is stacked on top of the second battery cell, and the first battery cell is stacked on top of the third battery cell. In the second first-end battery cell group, the third battery cell is stacked on top of the second battery cell, and the first battery cell is stacked on top of the third battery cell.

9. The three-cell battery assembly as described in claim 5, characterized in that, Viewed from the back of the three-cell battery assembly, when the second repeating battery cell group includes the second battery cell, the third battery cell, and the first battery cell arranged sequentially along the first direction, in the second repeating battery cell group, the second battery cell is stacked on top of the third battery cell, and the third battery cell is stacked on top of the first battery cell; In the second first-end battery cell group, the second battery cell is stacked on top of the third battery cell, and the third battery cell is stacked on top of the first battery cell.

10. The three-cell battery assembly as described in claim 1, characterized in that, The chamfer is between 25° and 75°.

11. The three-cell battery assembly as described in claim 1, characterized in that, The overlap width of two adjacent battery cells along the first direction is 0.85±0.4mm.

12. The three-cell battery assembly as described in claim 1, characterized in that, A plurality of the first battery strings are arranged sequentially along the second direction, and a plurality of the second battery strings are arranged sequentially along the second direction, the second direction intersecting the first direction.

13. A photovoltaic system, characterized in that, Includes the three-cell battery assembly as described in any one of claims 1 to 12.

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