Battery sheet and photovoltaic module

Abstract

The utility model discloses a kind of battery piece and photovoltaic module, battery piece includes battery piece ontology, multiple grid lines and multiple reinforcing parts. In second direction, first reinforcing section and second reinforcing section are respectively located on the two sides of reinforcing part in second direction, in first direction, the maximum place of first reinforcing section width is A and the maximum place of second reinforcing section width is B, the minimum width of reinforcing part portion between A and B is less than the maximum width of first reinforcing section, and / or, the minimum width of reinforcing part portion between A and B is less than the maximum width of second reinforcing section. According to the battery piece of the utility model, guarantee the connection tension of solder strip and first reinforcing section and / or second reinforcing section, prevent the occurrence of solder strip welding from the offset of solder strip relative to battery piece. Simultaneously make the setting fault tolerance of reinforcing part on grid line be higher, to improve the connection reliability between first reinforcing section and second reinforcing section and grid line.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, and in particular to a battery cell and a photovoltaic module. Background Technology

[0002] The reinforcing part is a metal contact point on a photovoltaic cell used to enhance welding reliability and current carrying capacity. The reinforcing part is usually located on the surface of the photovoltaic cell. As a metal electrode designed for a specific position, its main function is to connect the cell to the solder ribbon, which can enhance the conductivity between the photovoltaic cell and the solder ribbon, and at the same time increase the welding strength between the solder ribbon and the photovoltaic cell.

[0003] In related technologies, the shape of the reinforcing part is rectangular or a structure that is wide in the middle and narrow on both sides. When the weld strip is offset or other conditions that affect the welding tensile force occur, it is very easy for the weld strip to detach. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery cell that ensures the connection tension between the solder strip and the first reinforcing section and / or the second reinforcing section, preventing solder strip detachment caused by the solder strip shifting relative to the battery cell.

[0005] Another objective of this invention is to provide a photovoltaic module.

[0006] A battery cell according to a first aspect of the present invention includes: a battery cell body; a plurality of grid lines disposed on at least one side surface of the battery cell body in the thickness direction, the plurality of grid lines being spaced apart along a first direction and extending along a second direction, the first direction being perpendicular to the second direction; a plurality of reinforcing portions disposed on the plurality of grid lines, at least one of the reinforcing portions including a first reinforcing segment and a second reinforcing segment connected to each other along the second direction, wherein the first reinforcing segment and the second reinforcing segment are respectively located on both sides of the reinforcing portion in the second direction, and in the first direction, the maximum width of the first reinforcing segment is A and the maximum width of the second reinforcing segment is B, the minimum width of the reinforcing portion between A and B is less than the maximum width of the first reinforcing segment, and / or, the minimum width of the reinforcing portion between A and B is less than the maximum width of the second reinforcing segment.

[0007] According to the battery cell of this utility model embodiment, the solder ribbon is limited by the size limitation of the first and second reinforcing sections of the reinforcing portion, ensuring a stable connection of the solder ribbon. When the solder ribbon shifts to the point A where the width of the first reinforcing section is maximum and / or the point B where the width of the second reinforcing section is maximum, the connection tension between the solder ribbon and the first and / or second reinforcing sections is guaranteed, preventing solder ribbon detachment caused by the offset of the solder ribbon relative to the battery cell. Simultaneously, this increases the offset range of the grid line relative to the first and / or second reinforcing sections in the first direction, resulting in a higher tolerance for the reinforcement portion on the grid line, thereby improving the connection reliability between the first and second reinforcing sections and the grid line.

[0008] According to some embodiments of the present invention, the width of the first reinforcing segment gradually decreases in the first direction from the first reinforcing segment toward the second reinforcing segment; and / or the width of the second reinforcing segment gradually decreases in the first direction from the second reinforcing segment toward the first reinforcing segment.

[0009] According to some embodiments of the present invention, along the first direction from the first reinforcing segment toward the second reinforcing segment, the width of the first reinforcing segment in the first direction gradually increases and then gradually decreases; and / or along the first direction from the second reinforcing segment toward the first reinforcing segment, the width of the second reinforcing segment in the first direction gradually increases and then gradually decreases.

[0010] According to some embodiments of the present invention, the maximum width of the first reinforcing segment in the first direction is W1, and the minimum width of the reinforcing portion between A and B in the second direction is W2, wherein W1 and W2 satisfy: 2≤W1 / W2≤3; and / or the maximum width of the second reinforcing segment in the first direction is W3, and the minimum width of the reinforcing portion between A and B in the second direction is W4, wherein W3 and W4 satisfy: 2≤W3 / W4≤3.

[0011] According to some embodiments of the present invention, the length of the first reinforcing segment in the second direction is L1, wherein L1 satisfies: 200μm≤L1≤600μm; and / or the length of the second reinforcing segment in the second direction is L2, wherein L2 satisfies: 200μm≤L2≤600μm.

[0012] According to some embodiments of the present invention, the length of the first reinforcing segment in the second direction is greater than the width of the first reinforcing segment in the first direction, and the length of the second reinforcing segment in the second direction is greater than the width of the second reinforcing segment in the first direction.

[0013] According to some embodiments of the present invention, at least one of the reinforcing portions further includes: a third reinforcing segment connected between the first reinforcing segment and the second reinforcing segment, wherein the maximum width of the first reinforcing segment in the first direction is greater than the minimum width of the third reinforcing segment in the first direction; and / or the maximum width of the second reinforcing segment in the first direction is greater than the minimum width of the third reinforcing segment in the first direction.

[0014] According to some embodiments of the present invention, the width of the third reinforcing segment is equal everywhere in the second direction; or the width of the third reinforcing segment gradually decreases in the second direction from the middle of the third reinforcing segment toward both ends of the third reinforcing segment.

[0015] According to some embodiments of the present invention, the length of the third reinforcing segment in the second direction is greater than the width of the third reinforcing segment in the first direction.

[0016] According to some embodiments of the present invention, the length of the first reinforcing segment in the second direction is L1, and the length of the third reinforcing segment in the second direction is L3, wherein L1 and L3 satisfy: 1 / 3≤L1 / L3≤1 / 2; and / or the length of the second reinforcing segment in the second direction is L2, and the length of the third reinforcing segment in the second direction is L3, wherein L2 and L3 satisfy: 1 / 3≤L2 and L3≤1 / 2.

[0017] According to some embodiments of the present invention, at least one of the reinforcing portions further includes: two fourth reinforcing segments, the two fourth reinforcing segments being respectively connected to the ends of the first reinforcing segment and the second reinforcing segment that are away from each other, the length of the fourth reinforcing segment in the first direction being greater than the maximum width of the first reinforcing segment in the first direction; and / or the length of the fourth reinforcing segment in the first direction being greater than the maximum width of the second reinforcing segment in the first direction.

[0018] According to some embodiments of the present invention, the length of the fourth reinforcing segment in the first direction is greater than the width of the fourth reinforcing segment in the second direction.

[0019] According to some embodiments of the present invention, the plurality of reinforcing portions include at least one first reinforcing portion and at least one second reinforcing portion, the first reinforcing portion and the second reinforcing portion being opposite to each other along the first direction, and the orthogonal projection area of ​​the first reinforcing portion on the battery cell body being greater than the orthogonal projection area of ​​the second reinforcing portion on the battery cell body.

[0020] According to some embodiments of the present invention, the width of the first reinforcing part in the first direction is greater than the width of the second reinforcing part in the first direction; and / or the length of the first reinforcing part in the second direction is greater than the length of the second reinforcing part in the second direction.

[0021] According to some embodiments of the present invention, there are multiple first reinforcing parts, and the multiple first reinforcing parts are respectively disposed on both sides of the second reinforcing part along the first direction. At least two adjacent first reinforcing parts located on the same side of the second reinforcing part are electrically connected by connecting grid lines.

[0022] According to some embodiments of the present invention, a plurality of the first reinforcing portions are respectively disposed at both ends of the battery cell body along the first direction.

[0023] A photovoltaic module according to a second aspect of the present invention includes: a solar cell, wherein the solar cell is the same as that described in the first aspect of the present invention; and a solder strip electrically connected to a plurality of reinforcing portions.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of a battery cell according to an embodiment of the present utility model;

[0027] Figure 2 yes Figure 1 Enlarged view of part A shown in the center circle;

[0028] Figure 3 This is a schematic diagram of the reinforcing portion of the battery cell according to the first aspect of the present invention;

[0029] Figure 4 This is a schematic diagram of the reinforcing portion of the battery cell according to a second aspect embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the reinforcing portion of the battery cell according to a third aspect embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the reinforcing portion of the battery cell according to the fourth aspect embodiment of the present invention;

[0032] Figure 7This is a schematic diagram of the reinforcing portion of the battery cell according to a fifth aspect embodiment of the present invention.

[0033] Figure label:

[0034] 100: Battery cell;

[0035] 1: Cell body; 2: Grid line; 3: Reinforcing section; 31: First reinforcing section; 32: Second reinforcing section; 33: Third reinforcing section; 34: Fourth reinforcing section; 35: First reinforcing section; 36: Second reinforcing section; 4: Connecting grid line;

[0036] 200: Photovoltaic modules. Detailed Implementation

[0037] The following is for reference. Figures 1-7 Description of a battery cell 100 according to an embodiment of the present utility model.

[0038] like Figures 1-7 As shown, the battery cell 100 according to an embodiment of the present invention includes a battery cell body 1, a plurality of grid lines 2, and a plurality of reinforcing parts 3. In the description of the present invention, "a plurality of" means two or more.

[0039] Specifically, a plurality of grid lines 2 are disposed on at least one side surface of the cell body 1 in the thickness direction, and the plurality of grid lines 2 are along a first direction (e.g., Figure 1 The grid lines are spaced apart in the vertical direction, and the grid lines 2 are along the second direction (e.g., Figure 1 Extending in the left-right direction, the first direction is perpendicular to the second direction. Multiple reinforcing portions 3 are respectively disposed on multiple grid lines 2. At least one reinforcing portion 3 includes a first reinforcing segment 31 and a second reinforcing segment 32 connected to each other along the second direction, and in the second direction, the first reinforcing segment 31 and the second reinforcing segment 32 are respectively located on both sides of the reinforcing portion 3 in the second direction. In the first direction, the maximum width of the first reinforcing segment 31 is A, and the maximum width of the second reinforcing segment 32 is B. The minimum width of the portion of the reinforcing portion 3 between A and B is less than the maximum width of the first reinforcing segment 31, and / or, the minimum width of the portion of the reinforcing portion 3 between A and B is less than the maximum width of the second reinforcing segment 32.

[0040] It is understandable that "multiple reinforcing parts 3 are respectively provided on multiple grid lines 2" can mean that each grid line 2 is provided with a reinforcing part 3, or that only some grid lines 2 are provided with reinforcing parts 3. Furthermore, "at least one reinforcing part 3 includes a first reinforcing segment 31 and a second reinforcing segment 32 connected to each other along the second direction" can mean that the first reinforcing segment 31 and the second reinforcing segment 32 are directly connected, such as... Figure 4 , Figure 5 As shown; alternatively, the first reinforcing segment 31 and the second reinforcing segment 32 can be indirectly connected, such as... Figure 3 , Figure 6, Figure 7 As shown.

[0041] It should also be noted that the "reinforcing part 3 between A and B" here refers to the fact that the overall structure of reinforcing part 3 is divided into 3 parts with A and B as the dividing line. The part located between A and B is the "reinforcing part 3 between A and B".

[0042] For example, in Figures 1-7 In the example, multiple grid lines 2 are spaced apart in the first direction and then arranged parallel to each other in the second direction. This increases the regularity of the arrangement of the multiple grid lines 2 and avoids interference between them. The maximum width A of the first reinforcing section 31 and the maximum width B of the second reinforcing section 32 are suitable for limiting the solder strip, ensuring stable connection (welding) of the solder strip. This ensures that when the solder strip shifts to the maximum width positions A and / or B of the first reinforcing section 31 and / or the second reinforcing section 32, the connection tension between the solder strip and the first reinforcing section 31 and / or the second reinforcing section 32 is maintained, preventing solder strip detachment caused by shifting relative to the battery cell 100. Simultaneously, the larger maximum width A of the first reinforcing section 31 and the larger maximum width B of the second reinforcing section 32 increases the offset range of the grid lines 2 relative to the first reinforcing section 31 and / or the second reinforcing section 32 in the first direction, resulting in a higher tolerance for the reinforcement portion 3 on the grid lines 2, thereby improving the connection reliability between the first reinforcing section 31 and the second reinforcing section 32 and the grid lines 2. The width of the reinforcing section 3 between A and B is smaller, which helps to reduce the volume of the reinforcing section 3, reduce the use of silver paste, and reduce the cost of the battery cell 100.

[0043] According to the embodiment of the present invention, the battery cell 100, by limiting the size of the first reinforcing segment 31 and the second reinforcing segment 32 of the reinforcing part 3, limits the welding strip, ensuring a stable connection of the welding strip. When the welding strip is offset to the maximum width A of the first reinforcing segment 31 and / or the maximum width B of the second reinforcing segment 32, the connection tension between the welding strip and the first reinforcing segment 31 and / or the second reinforcing segment 32 is guaranteed, preventing the welding strip from desoldering due to the offset of the welding strip relative to the battery cell 100. At the same time, it is beneficial to increase the offset range of the grid line 2 relative to the first reinforcing segment 31 and / or the second reinforcing segment 32 in the first direction, so that the fault tolerance of the reinforcing part 3 on the grid line 2 is higher, thereby improving the connection reliability between the first reinforcing segment 31 and the second reinforcing segment 32 and the grid line 2.

[0044] According to some embodiments of this utility model, refer to Figure 3 , Figure 4 and Figure 7Along the first direction from the first reinforcing segment 31 toward the second reinforcing segment 32, the width of the first reinforcing segment 31 gradually decreases in the first direction. The width of the end of the first reinforcing segment 31 furthest from the second reinforcing segment 32 is the maximum width of the first reinforcing segment 31. Therefore, the connection length between the end of the first reinforcing segment 31 furthest from the second reinforcing segment 32 and the gate line 2 is the largest, thus maximizing the fault tolerance of the connection between the aforementioned end and the gate line 2. At the same time, when the solder strip shifts toward the aforementioned end of the first reinforcing segment 31, the larger width of the aforementioned end facilitates an increase in the connection area between the solder strip and the reinforcing part 3, thereby improving the welding tensile strength between the solder strip and the reinforcing part 3 and enhancing the connection stability and reliability of the solder strip and the reinforcing part 3.

[0045] Along the first direction from the second reinforcing segment 32 toward the first reinforcing segment 31, the width of the second reinforcing segment 32 gradually decreases in the first direction. The width of the end of the second reinforcing segment 32 furthest from the first reinforcing segment 31 is the maximum width of the second reinforcing segment 32. Therefore, the connection length between the end of the second reinforcing segment 32 furthest from the first reinforcing segment 31 and the gate line 2 is the largest, thus maximizing the fault tolerance of the connection between the aforementioned end and the gate line 2. Simultaneously, when the solder strip shifts toward the aforementioned end of the second reinforcing segment 32, the larger width of the aforementioned end facilitates an increase in the connection area between the solder strip and the reinforcing portion 3, thereby improving the welding tensile strength between the solder strip and the reinforcing portion 3 and enhancing the connection stability and reliability of the solder strip and the reinforcing portion 3.

[0046] For example, the cross-sectional shape of the first reinforcing segment 31 and the second reinforcing segment 32 can be independently selected as trapezoidal or triangular, etc. No specific limitation is made here.

[0047] According to some embodiments of this utility model, refer to Figure 5 and Figure 6 Along the first direction from the first reinforcing segment 31 toward the second reinforcing segment 32, the width of the first reinforcing segment 31 gradually increases and then gradually decreases in the first direction. The width of the end of the first reinforcing segment 31 away from the second reinforcing segment 32 is smaller, and the maximum width of the first reinforcing segment 31 is located at both ends away from the first direction. The width of the end of the first reinforcing segment 31 toward the second reinforcing segment 32 is also smaller. Thus, the maximum width of the first reinforcing segment 31 meets the usage requirements of the reinforcing part 3, extends the length of the first reinforcing segment 31, disperses the connecting tensile force on the reinforcing part 3, extends the service life of the reinforcing part, and at the same time, helps to reduce the use of silver paste in the reinforcing part 3, thereby reducing the cost of the reinforcing part 3 and thus the cost of the battery cell 100.

[0048] Along the first direction from the second reinforcing section 32 toward the first reinforcing section 31, the width of the second reinforcing section 32 gradually increases and then gradually decreases in the first direction. The width of the end of the second reinforcing section 32 away from the first reinforcing section 31 is smaller, and the maximum width of the second reinforcing section 32 is located at both ends away from the first direction. The width of the end of the second reinforcing section 32 toward the first reinforcing section 31 is also smaller. Thus, the maximum width of the second reinforcing section 32 meets the usage requirements of the reinforcing part 3, extends the length of the second reinforcing section 32, disperses the connecting tensile force on the reinforcing part 3, extends the service life of the reinforcing part, and at the same time, helps to reduce the use of silver paste in the reinforcing part 3, thereby reducing the cost of the reinforcing part 3 and consequently reducing the cost of the battery cell 100.

[0049] For example, the cross-sectional shape of the first reinforcing segment 31 and the second reinforcing segment 32 can be independently selected as an ellipse or a rhombus, etc. No specific limitation is made here.

[0050] According to some specific embodiments of this utility model, refer to Figure 3 The first reinforcing segment 31 has a maximum width of W1 in the first direction and a minimum width of the reinforcing portion 3 between A and B in the second direction, where W1 and W2 satisfy 2 ≤ W1 / W2 ≤ 3. When the ratio of the maximum width of the first reinforcing segment 31 to the minimum width of the reinforcing portion 3 between A and B is less than 2, the maximum width of the first reinforcing segment 31 is small, making it difficult to meet the tolerance requirements of the first reinforcing segment 31 for the grid lines 2 and solder ribbons. When the ratio of the maximum width of the first reinforcing segment 31 to the minimum width of the reinforcing portion 3 between A and B is greater than 3, the maximum width of the first reinforcing segment 31 is large, increasing the use of silver paste and thus increasing the cost of the solar cell 100. Therefore, by setting the ratio of the maximum width of the first reinforcing segment 31 to the minimum width of the reinforcing portion 3 between A and B to 2 ≤ W1 / W2 ≤ 3, the maximum width of the first reinforcing segment 31 is more reasonable, which can meet the offset tolerance requirements for the grid lines 2 and solder ribbons while reducing the use of silver paste in the reinforcing portion 3 and lowering the cost of the solar cell 100.

[0051] The second reinforcing segment 32 has a maximum width of W3 in the first direction and a minimum width of W4 in the reinforcing portion 3 between A and B in the second direction, where W3 and W4 satisfy: 2 ≤ W3 / W4 ≤ 3. When the ratio of the maximum width of the second reinforcing segment 32 to the minimum width of the reinforcing portion 3 between A and B is less than 2, the maximum width of the second reinforcing segment 32 is small, making it difficult to meet the tolerance requirements of the second reinforcing segment 32 for the grid lines 2 and the solder ribbons. When the ratio of the maximum width of the second reinforcing segment 32 to the minimum width of the reinforcing portion 3 between A and B is greater than 3, the maximum width of the second reinforcing segment 32 is large, increasing the use of silver paste and thus increasing the cost of the solar cell 100. Therefore, by setting the ratio of the maximum width of the second reinforcing segment 32 to the minimum width of the reinforcing portion 3 between A and B to 2 ≤ W3 / W4 ≤ 3, the maximum width of the second reinforcing segment 32 is more reasonable, which can meet the offset tolerance requirements for the grid lines 2 and the solder ribbons while reducing the use of silver paste in the reinforcing portion 3 and lowering the cost of the solar cell 100.

[0052] According to some other embodiments of the present invention, refer to Figure 1 The length of the first reinforcing segment 31 in the second direction is L1, where L1 satisfies: 200μm≤L1≤600μm. When the length of the first reinforcing segment 31 in the second direction is less than 200μm, the length of the first reinforcing segment 31 is too small, making it difficult to meet the requirements for reliable connection of the grid line 4 and / or solder ribbon; when the length of the first reinforcing segment 31 in the second direction is greater than 600μm, the length of the first reinforcing segment 31 is too large, increasing the amount of silver paste used and potentially increasing the cost of the solar cell 100. Therefore, by limiting the length of the first reinforcing segment 31 in the second direction to 200μm≤L1≤600μm, the length of the first reinforcing segment 31 is more reasonable, meeting the requirements for reliable connection of the first reinforcing segment 31 to the grid line 4 and / or solder ribbon, while also facilitating reasonable control of the amount of silver paste used, thereby helping to control the cost of the solar cell 100.

[0053] The length of the second reinforcing segment 32 in the second direction is L2, where L2 satisfies: 200μm ≤ L2 ≤ 600μm. When the length of the second reinforcing segment 32 in the second direction is less than 200μm, the length of the second reinforcing segment 32 is too small, making it difficult to meet the requirements for reliable connection of the grid lines 4 and / or solder ribbons; when the length of the second reinforcing segment 32 in the second direction is greater than 600μm, the length of the second reinforcing segment 32 is too large, increasing the amount of silver paste used and potentially increasing the cost of the solar cell 100. Therefore, by limiting the length of the second reinforcing segment 32 in the second direction to 200μm ≤ L2 ≤ 600μm, the length of the second reinforcing segment 32 is more reasonable, meeting the requirements for reliable connection of the second reinforcing segment 32 to the grid lines 4 and / or solder ribbons, while also facilitating reasonable control of the amount of silver paste used, thereby helping to control the cost of the solar cell 100.

[0054] According to some embodiments of the present invention, the length of the first reinforcing segment 31 in the second direction is greater than the width of the first reinforcing segment 31 in the first direction, and the length of the second reinforcing segment 32 in the second direction is greater than the width of the second reinforcing segment 32 in the first direction.

[0055] The length of the first reinforcing segment 31 of the reinforcing part 3 on the grid line 2 along the extension direction of the grid line 2 is greater than the width of the first reinforcing segment 31 in the spacing direction of the grid line 2, and the length of the second reinforcing segment 32 along the extension direction of the grid line 2 is greater than the width of the second reinforcing segment 32 in the spacing direction of the grid line 2. The length of the first reinforcing segment 31 is greater than the width, and the length of the second reinforcing segment 32 is greater than the width, so as to meet the connection requirements of the first reinforcing segment 31 and the second reinforcing segment 32 in the length and width directions.

[0056] Specifically, the point A at which the first reinforcing segment 31 has the greatest width and the point B at which the second reinforcing segment 32 has the greatest width can be connected to at least a portion of the extension direction of the gate line 2. Since the width of the gate line 2 in the first direction is relatively small, the connection requirement for the width of the first reinforcing segment 31 and the second reinforcing segment 32 in the first direction is relatively small. The first reinforcing segment 31 and the second reinforcing segment 32 can be connected to the solder strip along the first direction. Since the width of the solder strip in the second direction is relatively large, the length of the first reinforcing segment 31 and the second reinforcing segment 32 in the second direction is relatively large, which is beneficial to ensuring the reliability of the connection between the first reinforcing segment 31 and the second reinforcing segment 32 and the solder strip.

[0057] According to some other embodiments of the present invention, referring to Figures 3-7 At least one reinforcing portion 3 further includes a third reinforcing segment 33, which connects between the first reinforcing segment 31 and the second reinforcing segment 32. The maximum width of the first reinforcing segment 31 in the first direction is greater than the minimum width of the third reinforcing segment 33 in the first direction. The third reinforcing segment 33 is disposed between the first reinforcing segment 31 and the second reinforcing segment 32, and the extension length of the reinforcing portion 3 in the second direction can be extended by the third reinforcing segment 33, so as to improve the connection reliability of the reinforcing portion 3 with the grid line 2 and / or solder strip. The smaller minimum width of the third reinforcing segment 33 helps to save the use of silver paste in the reinforcing portion 3 and reduce the use cost of the solar cell 100.

[0058] The maximum width of the second reinforcing section 32 in the first direction is greater than the minimum width of the third reinforcing section 33 in the first direction. The smaller minimum width of the second reinforcing section 32 helps to save the amount of silver paste used in the reinforcing part 3, thereby reducing the cost of using the solar cell 100.

[0059] Furthermore, referring to Figure 3 and Figure 4The width of the third reinforcing segment 33 is equal everywhere in the second direction. The third reinforcing segment 33 can be rectangular. No specific limitation is made here. Therefore, the structure of the third reinforcing segment 33 is relatively simple, which makes it easier to improve the installation efficiency of the reinforcing part 3.

[0060] Along the second direction from the middle of the third reinforcing section 33 toward both ends of the third reinforcing section 33, the width of the third reinforcing section 33 gradually decreases in the second direction. The width of the third reinforcing section 33 is the largest at the middle and the width of the third reinforcing section 33 is the smallest at both ends of the third reinforcing section 33, that is, at the ends where the third reinforcing section 33 connects the first reinforcing section 31 and the second reinforcing section 32. Thus, while ensuring a stable and reliable connection between the third reinforcing section 33 and the first reinforcing section 31 and the second reinforcing section 32, it is beneficial to disperse the stress on the third reinforcing section 33, thereby improving the dispersion of the connection tension between the reinforcing part 3 and the grid line 2 and the welding strip, which in turn improves the structural stability of the battery cell 100 and extends the service life of the battery cell 100.

[0061] For example, the cross-sectional shape of the third reinforcing segment 33 can be elliptical. No specific limitation is made here.

[0062] According to other embodiments of the present invention, refer to 3. Figure 6 and Figure 7 The length of the third reinforcing segment 33 in the second direction is greater than its width in the first direction. This fully utilizes the function of the third reinforcing segment 33 in connecting the first reinforcing segment 31 and the second reinforcing segment 32, extending its length, increasing the connection area between the reinforcing portion 3 and the grid line 2, improving the connection stability between the reinforcing portion 3 and the grid line 2, and dispersing the connection tension on the reinforcing portion 3, thus extending its service life. Simultaneously, reducing the width of the third reinforcing segment 33 prevents it from connecting to adjacent grid lines, improving the safety of the solar cell. Furthermore, it allows the third reinforcing segment 33 to reliably connect to the solder strip while reducing the amount of silver paste used in the third reinforcing segment 33.

[0063] For example, the cross-sectional shape of the third reinforcing segment 33 can be rectangular. No specific limitation is made here.

[0064] According to some other embodiments of the present invention, referring to Figure 1 The length of the first reinforcing segment 31 in the second direction is L1, and the length of the third reinforcing segment 33 in the second direction is L3, wherein L1 and L3 satisfy: 1 / 3 ≤ L1 / L3 ≤ 1 / 2. Therefore, the ratio of the length of the first reinforcing segment 31 to the length of the third reinforcing segment 33 in the second direction is reasonable, which is conducive to ensuring the reliable connection of the solder strip and the grid line 2 by the first reinforcing segment 31 while minimizing the use of silver paste, thereby helping to control the cost of the solar cell 100.

[0065] The length of the second reinforcing segment 32 in the second direction is L2, and the length of the third reinforcing segment 33 in the second direction is L3, wherein L2 and L3 satisfy: 1 / 3 ≤ L2 and L3 ≤ 1 / 2. Therefore, the ratio of the length of the second reinforcing segment 32 to that of the third reinforcing segment 33 in the second direction is reasonable, which is conducive to ensuring the reliable connection of the solder strip and the grid line 2 by the second reinforcing segment 32 while minimizing the use of silver paste, thereby helping to control the cost of the solar cell 100.

[0066] According to some other embodiments of the present invention, referring to Figures 1-3 At least one reinforcing portion 3 further includes two fourth reinforcing segments 34, which are respectively connected to the ends of the first reinforcing segment 31 and the second reinforcing segment 32 away from each other. The length of the fourth reinforcing segment 34 in the first direction is greater than the maximum width of the first reinforcing segment 31 in the first direction; and / or the length of the fourth reinforcing segment 34 in the first direction is greater than the maximum width of the second reinforcing segment 32 in the first direction. One of the two fourth reinforcing segments 34 is located on the side of the first reinforcing segment 31 away from the second reinforcing segment 32, and the other of the two fourth reinforcing segments 34 is located at the end of the second reinforcing segment 32 away from the first reinforcing segment 31. The more reasonable length of the fourth reinforcing segment 34 in the first direction further increases the area where the reinforcing portion 3 can be connected to the grid line 2, improves the connection stability between the reinforcing portion 3 and the grid line 2, and limits the offset of the solder strip in the first direction, which is beneficial to improving the welding stability between the solder strip and the battery cell 100.

[0067] Furthermore, referring to Figures 1-3 The length of the fourth reinforcing segment 34 in the first direction is greater than its width in the second direction. This greater length increases the connection area between the reinforcing portion 3 and the grid line 2, improving the connection stability and limiting the solder strip. It also disperses the connection tension on the reinforcing portion 3, extending its service life. Simultaneously, reducing the width of the fourth reinforcing segment 34 reduces the amount of silver paste used, lowering the cost of the solar cell 100.

[0068] According to some embodiments of this utility model, refer to Figure 1 and Figure 2The plurality of reinforcing parts 3 include at least one first reinforcing part 35 and at least one second reinforcing part 36, which are opposite to each other along a first direction. The projected area of ​​the first reinforcing part 35 on the cell body 1 is larger than that of the second reinforcing part 36 on the cell body 1. The first reinforcing parts 35 and the second reinforcing parts 36 can be staggered along the first direction. No specific limitation is made here. The larger connection area between the first reinforcing part 35 and the solder strip or grid line 2 helps to distribute the connection tension. The arrangement of the second reinforcing part 36 helps to reasonably control the usage cost of the cell 100.

[0069] Furthermore, referring to 1 and Figure 2 The width of the first reinforcing part 35 in the first direction is greater than the width of the second reinforcing part 36 in the first direction. The first reinforcing part 35 has more possible connection points with the grid line 2, thereby increasing the connection tolerance between the first reinforcing part 35 and the grid line 2, which is beneficial for improving the assembly efficiency of the battery cell 100. At the same time, the increased connection area between the first reinforcing part 35 and the solder ribbon is beneficial for improving the welding stability and reliability of the solder ribbon and the battery cell 100.

[0070] The length of the first reinforcing part 35 in the second direction is greater than the length of the second reinforcing part 36 in the second direction. The larger length of the first reinforcing part 35 is beneficial to improving the fault tolerance of the connection between the first reinforcing part 35 and the welding strip that extends along the first direction, thereby improving the connection efficiency between the welding strip and the first reinforcing part 35.

[0071] According to some embodiments of this utility model, refer to Figure 1 and Figure 2 There are multiple first reinforcing parts 35, which are respectively disposed on both sides of the second reinforcing part 36 along the first direction. At least two adjacent first reinforcing parts 35 on the same side of the second reinforcing part 36 are electrically connected by connecting grid lines 4. For example, two, three, or five first reinforcing parts 35 on the same side of the second reinforcing part 36 are connected by connecting grid lines 4. No specific limitation is made here. Therefore, using local connecting grid lines 4 is beneficial to achieve the purpose of segmented increase of connection (welding) tension, prevent the weld strip from breaking the connection with the first reinforcing part 35, and ensure that when the weld strip is welded to multiple reinforcing parts 35, the tension is distributed to each first reinforcing part 35 when there is external pulling, thus preventing the weld strip from detaching.

[0072] Furthermore, referring to Figure 1 and Figure 2 Multiple first reinforcing parts 35 are respectively provided at both ends of the battery cell body 1 along the first direction. The first reinforcing parts 35 are located at both the beginning and end of the battery cell body 1 along the first direction, thereby increasing the tensile force at the beginning and end of the solder strip and reducing the risk of solder strip detachment.

[0073] A photovoltaic module 200 according to a second aspect embodiment of the present invention includes: a solar cell 100, the solar cell 100 being the solar cell 100 according to the first aspect embodiment of the present invention described above; and a solder strip, the solder strip being electrically connected to a plurality of reinforcing parts 3.

[0074] The photovoltaic module 200 according to the present invention helps to improve the welding stability and reliability of the solder ribbon and the battery cell 100, improve the stability of use and the efficiency of photoelectric conversion, and extend the service life.

[0075] For example, the photovoltaic module 200 of this application has a total cell size of 182mm×182mm to 210mm×210mm. Each half of the cell 100 has multiple first reinforcing portions 35 at both the beginning and end along a first direction. The dimensions of each first reinforcing portion 35 are 0.9mm×0.3mm to 1.2mm×0.45mm, and there are 3 to 5 first reinforcing portions 35 connected by connecting grid lines 4. Subsequent grid lines 2 have three first reinforcing portions 35 spaced 9.515mm apart and connected by connecting grid lines 4. Each half of the cell 100 has 30 to 60 first reinforcing portions 35 connected together. Three reinforcing portions 35 form a group, and multiple second reinforcing portions 36 are spaced apart between adjacent groups. Along the second direction, the spacing between adjacent connecting grid lines 4 is 9.4mm, and the outermost connecting grid line 4 is 4mm from the edge. Furthermore, along the second direction, the spacing between the two connecting grid lines 4 adjacent to the edge of the battery cell 100 is 7.2 mm.

[0076] Other configurations and operations of the battery cell 100 and photovoltaic module 200 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0077] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "circumferential", 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 utility model 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 utility model.

[0078] In the description of this application, it should be noted that, unless otherwise expressly 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0080] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: The battery cell itself; Multiple grid lines are disposed on at least one side surface of the cell body in the thickness direction, the multiple grid lines are spaced apart along a first direction, the grid lines extend along a second direction, and the first direction is perpendicular to the second direction; A plurality of reinforcing portions are respectively disposed on a plurality of grid lines. At least one of the reinforcing portions includes a first reinforcing segment and a second reinforcing segment connected to each other along the second direction, and the first reinforcing segment and the second reinforcing segment are respectively located on both sides of the reinforcing portion in the second direction. In the first direction, the maximum width of the first reinforcing segment is A and the maximum width of the second reinforcing segment is B. The minimum width of the reinforcing portion between A and B is less than the maximum width of the first reinforcing segment, and / or the minimum width of the reinforcing portion between A and B is less than the maximum width of the second reinforcing segment.

2. The battery cell according to claim 1, characterized in that, Along the second direction from the first reinforcing segment toward the second reinforcing segment, the width of the first reinforcing segment gradually decreases in the first direction; and / or Along the second direction from the second reinforcing segment toward the first reinforcing segment, the width of the second reinforcing segment gradually decreases in the first direction.

3. The battery cell according to claim 1, characterized in that, Along the second direction from the first reinforcing segment toward the second reinforcing segment, the width of the first reinforcing segment in the first direction first gradually increases and then gradually decreases; and / or Along the second direction from the second reinforcing segment toward the first reinforcing segment, the width of the second reinforcing segment in the first direction first gradually increases and then gradually decreases.

4. The battery cell according to claim 1, characterized in that, The maximum width of the first reinforcing segment in the first direction is W1, and the minimum width of the reinforcing portion between A and B in the second direction is W2, wherein W1 and W2 satisfy: 2 ≤ W1 / W2 ≤ 3; and / or The maximum width of the second reinforcing segment in the first direction is W3, and the minimum width of the reinforcing portion between A and B in the second direction is W4, wherein W3 and W4 satisfy: 2≤W3 / W4≤3.

5. The battery cell according to claim 1, characterized in that, The length of the first reinforcing segment in the second direction is L1, wherein L1 satisfies: 200μm≤L1≤600μm; and / or The length of the second reinforcing segment in the second direction is L2, wherein L2 satisfies: 200μm≤L2≤600μm.

6. The battery cell according to claim 1, characterized in that, The length of the first reinforcing segment in the second direction is greater than the width of the first reinforcing segment in the first direction, and the length of the second reinforcing segment in the second direction is greater than the width of the second reinforcing segment in the first direction.

7. The battery cell according to claim 1, characterized in that, At least one of the reinforcing parts further includes: A third reinforcing segment is connected between the first reinforcing segment and the second reinforcing segment. The maximum width of the first reinforcing segment in the first direction is greater than the minimum width of the third reinforcing segment in the first direction; and / or The maximum width of the second reinforcing segment in the first direction is greater than the minimum width of the third reinforcing segment in the first direction.

8. The battery cell according to claim 7, characterized in that, The width of the third reinforcing segment is equal everywhere in the second direction; or Along the second direction from the middle of the third reinforcing segment toward both ends of the third reinforcing segment, the width of the third reinforcing segment gradually decreases in the first direction.

9. The battery cell according to claim 7, characterized in that, The length of the third reinforcing segment in the second direction is greater than the width of the third reinforcing segment in the first direction.

10. The battery cell according to claim 7, characterized in that, The length of the first reinforcing segment in the second direction is L1, and the length of the third reinforcing segment in the second direction is L3, wherein L1 and L3 satisfy: 1 / 3 ≤ L1 / L3 ≤ 1 / 2; and / or The length of the second reinforcing segment in the second direction is L2, and the length of the third reinforcing segment in the second direction is L3, wherein L2 and L3 satisfy: 1 / 3≤L2 and L3≤1 / 2.

11. The battery cell according to claim 1, characterized in that, At least one of the reinforcing parts further includes: Two fourth reinforcing segments, each connected to the opposite end of the first and second reinforcing segments, wherein the length of each fourth reinforcing segment in the first direction is greater than the maximum width of the first reinforcing segment in the first direction; and / or The length of the fourth reinforcing segment in the first direction is greater than the maximum width of the second reinforcing segment in the first direction.

12. The battery cell according to claim 11, characterized in that, The length of the fourth reinforcing segment in the first direction is greater than the width of the fourth reinforcing segment in the second direction.

13. The battery cell according to any one of claims 1-12, characterized in that, The plurality of reinforcing portions include at least one first reinforcing portion and at least one second reinforcing portion, the first reinforcing portion and the second reinforcing portion being opposite to each other along the first direction, and the projected area of ​​the first reinforcing portion on the battery cell body being greater than the projected area of ​​the second reinforcing portion on the battery cell body.

14. The battery cell according to claim 13, characterized in that, The width of the first reinforcing part in the first direction is greater than the width of the second reinforcing part in the first direction; and / or The length of the first reinforcing part in the second direction is greater than the length of the second reinforcing part in the second direction.

15. The battery cell according to claim 13, characterized in that, There are multiple first reinforcing parts, which are respectively disposed on both sides of the second reinforcing part along the first direction. At least two adjacent first reinforcing parts located on the same side of the second reinforcing part are electrically connected by connecting grid lines.

16. The battery cell according to claim 15, characterized in that, The plurality of the first reinforcing portions are respectively disposed at both ends of the battery cell body along the first direction.

17. A photovoltaic module, characterized in that, include: The battery cell is a battery cell according to any one of claims 1-16; The welding strip is electrically connected to a plurality of reinforcing parts.

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