Electroplating pinch point structure of battery piece

Abstract

The utility model relates to a battery piece electroplating pinch point structure which comprises a battery piece, the battery piece is provided with an equally-divided center line, the equally-divided center line is parallel to the long side of the battery piece and divides the battery piece into two equally-divided areas, each equally-divided area is equally divided into at least two clamping areas, and the clamping areas are arranged in the equally-divided areas. Each clamping area is provided with a clamping point used for clamping of a clamp and a plurality of pad points arranged in an array mode, and the center of the clamping point falls onto the first pad point in the multiple pad points. The distance from the center of the first pad point to the first edge of the clamping area is a, and the distance from the center of the first pad point to the second edge of the clamping area is b; 0.5 < = a / b < = 2; the distance to the third edge of the clamping area is c, and the distance to the fourth edge of the clamping area is d; 0.5 < = c / d < = 2. The battery piece electroplating pinch point structure can effectively reduce the hidden crack or fragment risk of the battery piece and improve the yield of the battery piece.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to the electroplating pinch structure of solar cells. Background Technology

[0002] With the development of the photovoltaic industry and the growing trend towards silver-free battery grids, copper grid interconnect technology has rapidly advanced. This technology typically involves electroplating to form copper interconnect grids on the surface of the battery cell. During electroplating, the battery cell is held in a clamp, then immersed in the electroplating solution, and an electric current is applied to the cell through the clamp to perform the plating.

[0003] In the electroplating process, the design of the clamping points on the solar cells is particularly important, as it directly affects the quality of the finished solar cells. In related technologies, the clamping points are generally designed at the edge of the solar cell. However, because the edge of the solar cell has a higher risk of microcracks, clamping the solar cell at the edge will cause a higher proportion of breakage, affecting the yield of solar cell production. Utility Model Content

[0004] Therefore, it is necessary to provide a cell plating pinch structure to address the issue of improving the yield of cells after electroplating.

[0005] In a first aspect, this application provides a battery cell electroplating clamping structure, which includes a battery cell having an equal dividing center line parallel to the long side of the battery cell and dividing the battery cell into two equal regions along the short side direction. Each of the equal regions is divided along the long side direction to form at least two clamping regions. Each clamping region has a first edge coinciding with the long side of the battery cell, a second edge coinciding with the equal dividing center line, a third edge parallel to the short side of the battery cell, and a fourth edge parallel to or coinciding with the short side of the battery cell. Each clamping region is provided with a clamping point for clamping and a plurality of pad points arranged in an array. The center of the clamping point falls on the first pad point among the plurality of pad points.

[0006] The position of the first pad point satisfies the following conditions: the distance from the center of the first pad point to the first edge is a, and the distance from the center of the first pad point to the second edge is b; 0.5≤a / b≤2; the distance from the center of the first pad point to the third edge is c, and the distance from the center of the first pad point to the fourth edge is d; 0.5≤c / d≤2.

[0007] The technical solution will be further explained below:

[0008] In one embodiment, the first pad point is the pad point closest to the geometric center of the clamping region.

[0009] In one embodiment, the center of the grip point is set to coincide with the center of the first pad point.

[0010] In one embodiment, the area of ​​the grip point is greater than the area of ​​the first pad point, and the grip point covers the first pad point.

[0011] In one embodiment, the grip is circular, elliptical, or polygonal in shape.

[0012] In one embodiment, the first pad point is polygonal in shape, and the grip point is the circumcircle of the polygon.

[0013] In one embodiment, each of the equally divided regions is divided into n clamping regions, where n is a positive integer greater than or equal to 2, the length of the long side of the battery cell is L, and the distance between the centers of two adjacent clamping points in the same equally divided region is L / n.

[0014] In one embodiment, the short side of the battery cell is W, and the distance between the centers of two adjacent pinch points along the short side of the battery cell is W / 2.

[0015] In one embodiment, the first pad point also satisfies the following condition: a+b≠c+d.

[0016] In one embodiment, the clamps in the two equally divided regions are symmetrically arranged about the dividing center line.

[0017] In the aforementioned battery cell electroplating clamping structure, the battery cell is divided into two equal regions along its center line. Each region is then further divided into at least two clamping regions along its long side. A clamping point is set in each clamping region, ensuring that the center of the clamping point falls on the first pad point among multiple pad points within that region. The first pad point satisfies the following conditions: the distance from its center to the first edge is *a*, the distance from its center to the second edge is *b*, and 0.5 ≤ *a / b* ≤ 2; the distance from its center to the third edge is *c*, and the distance from its center to the second edge is *d*, and 0.5 ≤ *c / d* ≤ 2. This ensures that each clamping point is located on a pad point relatively close to the center of its corresponding clamping region, preventing the clamping point from falling onto the edge of the battery cell. This avoids the clamping point from affecting the fragile areas of the battery cell, reducing the risk of screen breakage and improving the yield rate after electroplating. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the electroplating pinch structure of a battery cell according to one embodiment.

[0022] Figure 2 This is a schematic diagram of grips of different shapes in some embodiments.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10. Battery cell; 11. Center line dividing the area equally; 12. Divided area equally; 121. Clamping area; 1211. First edge; 1212. Second edge; 1213. Third edge; 1214. Fourth edge; 13. Pad point; 131. First pad point; 14. Grip point. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0031] One embodiment of this application provides a battery cell electroplating clamp structure for determining the position of clamp 14 on the battery cell 10. See also Figure 1 , Figure 1 This is a schematic diagram of the battery cell electroplating clamp structure in one embodiment of this application. The battery cell electroplating clamp structure provided in one embodiment of this application includes a battery cell 10, which is rectangular in shape and has a long side and a short side that intersect. The length of the long side is L and the length of the short side is W, where L > W.

[0032] Furthermore, the battery cell 10 also has a dividing center line 11, which is parallel to the long side of the battery cell 10 and divides the battery cell 10 into two equal regions 12 in the short side direction. Each equal region 12 is divided into at least two clamping regions 121 in the long side direction of the battery cell 10. Each clamping region 121 has a first edge 1211 that coincides with the long side of the battery cell 10, a second edge 1212 that coincides with the dividing center line 11, a third edge 1213 that is parallel to the short side of the battery cell 10, and a fourth edge 1214 that is parallel to or coincides with the short side of the battery cell 10. Each clamping region 121 is provided with a clamping point 14 for clamping and a plurality of pad points 13 arranged in an array. The pad points 13 are used to connect with the solder ribbon, so that the solder ribbon connects different battery cells 10 in series or in parallel to form a battery string.

[0033] Furthermore, the center of the clamping point 14 of each clamping area 121 falls on the first pad point 131 among the multiple pad points 13 within the clamping area 121. The position of the first pad point 131 satisfies the following conditions: the distance from the center of the first pad point 131 to the first edge 1211 is a, the distance from the center of the first pad point 131 to the second edge 1212 is b, and 0.5≤a / b≤2; the distance from the center of the first pad point 131 to the third edge 1213 is c, and the distance from the center of the first pad point 131 to the second edge 1212 is d, and 0.5≤c / d≤2.

[0034] In the above-described battery cell electroplating clamping structure, the battery cell 10 is divided into two equal regions 12 along the equidistant center line 11. Each equal region 12 is then divided into at least two clamping regions 121 along its long side. A clamping point 14 is provided in each clamping region 121, such that the center of the clamping point 14 falls on the first pad point 131 among multiple pad points 13 within the clamping region 121. Since the first pad point 131 satisfies the condition that the distance from its center to the first edge 1211 is 'a', and the distance from its center to the second edge 1211 is 'a', the... The distance 12 is b, 0.5≤a / b≤2; the distance from the center of the first pad point 131 to the third edge 1213 is c, and the distance from the center of the first pad point 131 to the second edge 1212 is d, 0.5≤c / d≤2. This ensures that each clamping point 14 is located on the pad point 13 relatively close to the middle area in the corresponding clamping area 121, avoiding the position of the clamping point 14 falling into the edge of the battery cell 10. This makes the position of the clamping point 14 avoid the fragile area of ​​the battery cell 10, reducing the risk of screen breakage of the battery cell 10, and thus improving the yield of the battery cell 10 after electroplating.

[0035] For example, the value of a / b can be 0.5, 0.8, 1, 1.2, 1.5, 1.8 or 2, etc. Similarly, the value of c / d can be 0.5, 0.8, 1, 1.2, 1.5, 1.8 or 2, etc. Theoretically, the closer the values ​​of c / d and a / b are to 1, the closer the position of the clamping point 14 is to the geometric center of the clamping area 121, and the lower the risk of microcracks or screen breakage after electroplating of the battery cell 10. However, considering that the grid line arrangement and the distribution of pad points 13 of different battery cells 10 are different, some battery cells 10 may not have pad points 13 distributed at the geometric center of the clamping area 121, so the clamping point 14 cannot be set on the pad point 13. Therefore, by configuring the value of a / b to 0.5≤a / b≤2 and the value of c / d to 0.5≤a / b≤2, it is ensured that the clamping point 14 is not at the edge of the battery cell 10, and that the center of the clamping point 14 can fall on the pad point 13.

[0036] Optionally, in one embodiment, the first pad point 131 is the pad point 13 closest to the geometric center of the clamping area 121. That is, the clamping point 14 in each clamping area 121 is set on the pad point 13 closest to the geometric center of the clamping area 121, thereby ensuring that the position of the clamping point 14 is closer to the geometric center of the clamping area 121, further reducing the risk of screen breakage of the battery cell 10.

[0037] Optionally, in one embodiment, the center of the clamping point 14 is set to coincide with the center of the first pad point 131. This ensures that when the clamp is held on the clamping point 14, most of the clamping claws abut against the first pad point 131, reducing the obstruction of the battery cell 10 surface by the clamping claws and thus reducing the loss of the electroplated area of ​​the battery cell 10.

[0038] See Figure 1 In one embodiment, the area of ​​the clamping point 14 is larger than the area of ​​the first pad point 131, and the clamping point 14 covers the first pad point 131. Specifically, if the area of ​​the clamping point 14 is too small, stress concentration may easily occur when the clamp holds the battery cell 10, which may lead to microcracks or even fragmentation of the battery cell 10. By configuring the area of ​​the clamping point 14 to be larger than the area of ​​the first pad point 131, stress concentration can be effectively avoided, further reducing the risk of microcracks or fragmentation of the battery cell 10. For example, in one embodiment, the area of ​​the clamping point 14 is greater than or equal to 1.5mm*1.5mm.

[0039] Referring to Figure 1, in one embodiment, the grip 14 is circular in shape, for example, as shown in Figure 1. Figure 1 As shown, the first pad point 131 is polygonal in shape, and the clamp point 14 is the circumcircle of the polygon of the first pad point 131. For example, if the first pad point 131 is a square, the clamp point 14 is the circumcircle of the square. In this way, the area of ​​the clamp point 14 can be guaranteed to meet the requirements while reducing the shading of the clamp point 14 on the battery cell 10, thereby reducing the loss of the electroplating area of ​​the battery cell 10.

[0040] See Figure 2 It is worth noting that the shape of clamp 14 can also be elliptical or polygonal, such as rectangle, rhombus, triangle, pentagon, hexagon, pentagonal star center, etc., without any restrictions.

[0041] See Figure 1 Each equally divided region 12 is divided into n clamping regions 121, where n is a positive integer greater than or equal to 2, such as 2, 3, 4, 5, or 6. The length of the long side of the battery cell 10 is L, and the distance m between the centers of two adjacent clamping points 14 in the same equally divided region 12 is L / n. For example, in this embodiment, each equally divided region 12 is divided into 4 clamping regions 121, and the distance m between the centers of two adjacent clamping points 14 in the same equally divided region 12 is L / 4. This ensures that the spacing between two adjacent clamping points 14 in the long side direction of the battery cell 10 is uniform, so that the battery cell 10 is subjected to uniform force when the clamp holds the battery cell 10, further reducing the risk of microcracks or fragmentation of the battery cell 10.

[0042] Similarly, the length of the short side of the solar cell 10 is W, and the distance n between the centers of two adjacent clamping points 14 along the short side of the solar cell 10 is W / 2. This ensures that the spacing between two adjacent clamping points 14 along the long side of the solar cell 10 is uniform, so that the clamps bear force evenly when holding the solar cell 10, further reducing the risk of microcracks or fragmentation of the solar cell 10.

[0043] In one embodiment, the first pad point 131 also satisfies the following condition: a+b≠c+d, that is, each clamping area 121 is rectangular. Specifically, the battery cell 10 is generally rectangular, and by dividing the clamping area 121 into rectangles, it is more suitable for rectangular battery cells 10.

[0044] Optionally, in one embodiment, the clamping points 14 in the two equally divided regions 12 are symmetrically arranged about the dividing center line 11. This ensures that the force application points of the clamp on both sides of the battery cell 10 are symmetrical about the dividing center line 11, thereby ensuring that the forces on both sides of the battery cell 10 are balanced.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery piece electroplating pinch point structure, characterized by, The battery piece (10) has a bisecting center line (11) parallel to the long side of the battery piece (10) and bisects the battery piece (10) into two equal areas (12) in the short side direction of the battery piece (10), each of the equal areas (12) is divided into at least two clamping areas (121) in the long side direction, each of the clamping areas (121) has a first edge (1211) coinciding with the long side of the battery piece (10), a second edge (1212) coinciding with the bisecting center line (11), a third edge (1213) parallel to the short side of the battery piece (10), and a fourth edge (1214) parallel or coinciding with the short side of the battery piece (10), each of the clamping areas (121) is provided with a clamping point (14) for clamping and a plurality of pad points (13) arranged in an array, the center of the clamping point (14) falls on a first pad point (131) in the plurality of pad points (13); Wherein, the position of the first pad point (131) satisfies the following conditions: the distance from the center of the first pad point (131) to the first edge (1211) is a, the distance from the center of the first pad point (131) to the second edge (1212) is b; 0.5≤a / b≤2; the distance from the center of the first pad point (131) to the third edge (1213) is c, the distance from the center of the first pad point (131) to the fourth edge (1214) is d; 0.5≤c / d≤2.

2. The battery piece electroplating pinch point structure of claim 1, wherein, The first pad point (131) is the pad point (13) closest to the geometric center of the clamping area (121).

3. The battery piece electroplating pinch point structure of claim 1, wherein, The center of the clamping point (14) is coincidentally arranged with the center of the first pad point (131).

4. The battery piece electroplating pinch point structure of claim 1, wherein, The area of the clamping point (14) is greater than the area of the first pad point (131), and the clamping point (14) covers the first pad point (131).

5. The battery sheet electroplating nip point structure of claim 1, wherein, The shape of the clamping point (14) is circular, elliptical or polygonal.

6. The battery sheet electroplating nip point structure of claim 5, wherein, The shape of the first pad point (131) is polygonal, and the shape of the clamping point (14) is the circumscribed circle of the polygon.

7. The battery sheet electroplating nip point structure of claim 1, wherein, Each of the equal areas (12) is divided into n clamping areas (121), where n is a positive integer greater than or equal to 2, the length of the long side of the battery piece (10) is L, and the distance between the centers of two adjacent clamping points (14) in the same equal area (12) is L / n.

8. The battery sheet electroplating nip point structure of claim 1, wherein, The length of the short side of the battery piece (10) is W, and the distance between the centers of two adjacent clamping points (14) in the short side direction of the battery piece (10) is W / 2.

9. The battery sheet electroplating nip point structure of claim 1, wherein, The first pad point (131) also satisfies the following condition: a+b≠c+d.

10. The battery sheet electroplating nip point structure of claim 1, wherein, The clamping points (14) in the two equal areas (12) are symmetrically arranged about the bisecting center line (11).

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