Battery piece and photovoltaic module

Abstract

The utility model provides a battery piece and a photovoltaic assembly, and the battery piece comprises a battery body which is provided with a first surface and a second surface which are opposite to each other; the first bonding pad and the second bonding pad are arranged on the first surface and arranged in the first direction, the third bonding pad and the fourth bonding pad are arranged on the second surface and arranged in the first direction, the first bonding pad and the third bonding pad are close to the edge of the battery body, and the second bonding pad and the fourth bonding pad are close to the middle of the battery body; wherein the first bonding pad and the third bonding pad are arranged in an up-down corresponding mode, the second bonding pad and the fourth bonding pad are arranged in an up-down corresponding mode, and in orthographic projection in the thickness direction of the battery body, the distance between the center of the first bonding pad and the center of the third bonding pad is larger than the distance between the center of the second bonding pad and the center of the fourth bonding pad. The photovoltaic module comprises a battery piece layer which comprises a plurality of battery pieces which are arranged along rows and / or columns; and the sealing layer is laminated on the surface of the battery piece layer.

Description

Technical Field

[0001] At least one embodiment of the utility model relates to the field of photovoltaic technology, and in particular to a battery cell and a photovoltaic module. Background Art

[0002] The cells in photovoltaic modules mostly adopt a multi-busbar graphic design. Configuring cells with multiple busbars can effectively increase the current conduction efficiency of photovoltaic modules and improve the welding tension of cells to increase the stability of photovoltaic modules. In addition, the dense arrangement of multiple busbars can also give the cells a larger light-receiving area.

[0003] At present, for cells with multiple main grids, pads connected to the soldering strips are often set at overlapping positions on the front and back sides of the cell in the thickness direction. However, the pads set at the front and back sides of the cell overlap and are welded to the soldering strips, which will cause tin accumulation. The large and thick molten tin will cause the cell to be subjected to a large extrusion force during the subsequent lamination process, especially at the weaker edge of the cell, which can easily cause the cell to be crushed or form hidden cracks under the stress.

[0004] Therefore, how to provide a method for dispersing the stress on the battery body and preventing the battery cell from being crushed or forming hidden cracks has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] In order to solve at least one of the above and other technical problems in the prior art, the utility model provides a battery cell and a photovoltaic module, which can reduce the occurrence of battery cell being crushed or forming hidden cracks by dispersing stress.

[0006] An embodiment of the utility model provides a battery cell, comprising: a battery body, having a first surface and a second surface that are opposite to each other; and a first welding pad and a second welding pad arranged on the above-mentioned first surface and arranged along a first direction, a third welding pad and a fourth welding pad arranged on the above-mentioned second surface and arranged along the first direction, the above-mentioned first welding pad and the above-mentioned third welding pad are close to the edge of the above-mentioned battery body, and the above-mentioned second welding pad and the above-mentioned fourth welding pad are close to the middle of the above-mentioned battery body; wherein the above-mentioned first welding pad and the above-mentioned third welding pad are arranged correspondingly up and down, and the above-mentioned second welding pad and the above-mentioned fourth welding pad are arranged correspondingly up and down, and in the orthographic projection along the thickness direction of the above-mentioned battery body, the distance between the center of the above-mentioned first welding pad and the center of the above-mentioned third welding pad is greater than the distance between the center of the above-mentioned second welding pad and the center of the above-mentioned fourth welding pad.

[0007] In an illustrative embodiment, the second pad and the fourth pad are located on a center line of the battery body, and the center line is perpendicular to the first direction and bisects the battery body.

[0008] In an illustrative embodiment, in an orthographic projection along the thickness direction of the battery body, centers of the second welding pad and the fourth welding pad coincide with each other.

[0009] In an illustrative embodiment, the second welding pad is arranged between the center line of the battery body and the first welding pad, and the fourth welding pad is arranged between the center line of the battery body and the third welding pad, the center line is perpendicular to the first direction and bisects the battery body; wherein, in the orthographic projection along the thickness direction of the battery body, the center of the second welding pad is offset from the center of the fourth welding pad.

[0010] In an illustrative embodiment, the battery cell further has a fifth solder pad arranged on the first surface and a sixth solder pad arranged on the second surface, the fifth solder pad is arranged between the first solder pad and the second solder pad, the sixth solder pad is arranged between the third solder pad and the fourth solder pad, and the fifth solder pad and the sixth solder pad are arranged correspondingly up and down.

[0011] In an illustrative embodiment, in the orthographic projection along the thickness direction of the battery body, the distance between the center of the fifth welding pad and the center of the sixth welding pad is greater than the distance between the center of the second welding pad and the center of the fourth welding pad, and is smaller than the distance between the center of the first welding pad and the center of the third welding pad.

[0012] In an illustrative embodiment, in an orthographic projection along a thickness direction of the battery body, the fifth welding pad partially overlaps with the sixth welding pad.

[0013] In an illustrative embodiment, in an orthographic projection along a thickness direction of the battery body, the first welding pad and the third welding pad are staggered.

[0014] In an illustrative embodiment, the battery cell further comprises a first main grid disposed on the first surface of the battery body and extending along the first direction, and a second main grid disposed on the second surface of the battery body and extending along the first direction, wherein the first main grid and the second main grid extend in a direction parallel to the wide side of the battery body; wherein the first main grid passes through the first welding pad and the second welding pad, and the second main grid passes through the third welding pad and the fourth welding pad.

[0015] In an illustrative embodiment, the battery cell also includes a first harpoon structure located on the first surface and a second harpoon structure located on the second surface, the first harpoon structure is connected to the first solder pad, the second harpoon structure is connected to the third solder pad, and the width of the first harpoon structure along the first direction is greater than the width of the second harpoon structure along the first direction.

[0016] The embodiment of the utility model further provides a photovoltaic module, comprising: a cell layer, comprising a plurality of cells, wherein the plurality of cells are arranged along rows and / or columns; and a sealing layer laminated on the surface of the cell layer.

[0017] According to the battery cell and photovoltaic module provided by the utility model, in response to the characteristics that the closer the battery body is to the edge, the worse the structural strength is, and the more susceptible it is to stress and cracking, the corresponding positions of the first and third pads, and the second and fourth pads, which are arranged on the two surfaces of the battery body, are designed. In the orthographic projection along the thickness direction of the battery body, the spacing between the first and third pads near the edge of the battery body is greater than the spacing between the second and fourth pads near the middle of the battery body, which can effectively reduce the solder accumulation problem of the corresponding pads near the edge of the battery body, and disperse the stress on the edge of the battery body, which is conducive to preventing the edge of the battery body from cracking and / or fragmenting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery cell according to an exemplary embodiment of the present utility model, viewed from a perspective facing the first surface;

[0019] Figure 2 yes Figure 1 A schematic diagram of a battery sheet of the exemplary embodiment shown in FIG. 1 from a perspective facing the second surface;

[0020] Figure 3 yes Figure 1 The first main grid and Figure 2 A schematic diagram of the second main grid stack arrangement shown, wherein the battery body is omitted;

[0021] Figure 4 yes Figure 3 A partial enlarged view of part A of the battery cell shown;

[0022] Figure 5 yes Figure 4 A partial enlarged view of part B of the battery cell shown; and

[0023] Figure 6 yes Figure 4 A partial enlarged view of portion C of the battery cell shown.

[0024] In the drawings, the meanings of the reference numerals are as follows:

[0025] 1. A first electrode;

[0026] 11. The first harpoon structure;

[0027] 12. First pad;

[0028] 13. Fifth pad;

[0029] 14. Second pad;

[0030] 15. The first main grid;

[0031] 16. First feeler;

[0032] 2. a second electrode;

[0033] 21. Second harpoon structure;

[0034] 22. The third pad;

[0035] 23. Sixth pad;

[0036] 24. Fourth pad;

[0037] 25. Second main grid;

[0038] 26. Second antennae; and

[0039] 3. Battery body. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0041] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "include", "comprises", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0042] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0043] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0044] Figure 1 It is a schematic diagram of a viewing angle of a battery cell facing the first surface according to an exemplary embodiment of the utility model. Figure 2 yes Figure 1 The schematic diagram of the battery sheet of the exemplary embodiment shown is a perspective view facing the second surface. Figure 3 yes Figure 1 The first main grid and Figure 2 The schematic diagram of the second main grid stacking arrangement is shown, in which the battery body is omitted.

[0045] According to the battery cell provided by the utility model, Figures 1 to 3 As shown, it includes a battery body 3, and the battery body 3 has a first surface and a second surface that are separated from each other. The battery cell also includes a first pad 12 and a second pad 14 arranged on the first surface and arranged along the first direction, and a third pad 22 and a fourth pad 24 arranged on the second surface and arranged along the first direction. The first pad 12 and the third pad 22 are close to the edge of the battery body 3, and the second pad 14 and the fourth pad 24 are close to the middle of the battery body 3. Among them, the first pad 12 and the third pad 22 are arranged correspondingly up and down, and the second pad 14 and the fourth pad 24 are arranged correspondingly up and down. In the orthographic projection along the thickness direction of the battery body 3, the distance between the center of the first pad 12 and the center of the third pad 22 is greater than the distance between the center of the second pad 14 and the center of the fourth pad 24.

[0046] In such an embodiment, in response to the battery body 3 being closer to the edge (such as Figure 1 and Figure 2The left and right ends shown in the figure have the characteristics that the worse the structural strength of the part, the more susceptible it is to stress and cracking. The corresponding positions of the first pad 12 and the third pad 22, and the second pad 14 and the fourth pad 24, which are arranged on the two surfaces of the battery body, are designed. The spacing between the center of the second pad 14 and the center of the fourth pad 24 located in the middle of the battery body is designed to be smaller than the spacing between the center of the first pad 12 and the center of the third pad 22, so that the corresponding pads (such as the first pad 12 and the third pad 22, and the second pad 14 and the fourth pad 24) closer to the middle of the battery body 3 have a higher degree of overlap in the thickness direction of the battery body 3 (correspondingly, the farther away from the middle of the battery body 3, the lower the degree of overlap of the corresponding pads). In this way, the tendency of phase misalignment of the pads farther away from the middle of the battery body 3 is greater, so as to gradually disperse the stress of the edge of the battery body 3.

[0047] In an illustrative embodiment, Figure 1 As shown, the battery body 3 includes but is not limited to being formed by two slices of a rectangular silicon wafer. In detail, the size of the rectangular silicon wafer includes but is not limited to being configured as 182.2mm×191.6mm, and the diameter (characterized as the diagonal corners of the silicon wafer are configured as chamfers, and the four chamfers of the silicon wafer are located on the same circle The diameter of the circle) is configured as 262.5mm. Further, the size of the battery body 3 formed by the two slices of the silicon wafer is configured as 182.2mm×95.8mm, wherein the longer side of the battery body 3 is characterized as the long side (i.e., Figure 1 The side length shown is L1, L1 = 182.2 mm), and the shorter side of the battery body 3 is characterized as the wide side (i.e. Figure 1 The side length shown is the side of L2, L2 = 95.8 mm).

[0048] In an exemplary implementation, Figure 1 As shown, including but not limited to extending the wide side of the battery body 3 (such as Figure 1 Further, the center line of the battery body 3 is defined as being parallel to the long side of the battery body 3 and perpendicular to the arrangement direction of the first pad 12 and the second pad 14 (i.e., the first direction mentioned above), and the battery body 3 is divided into two equal parts. Figure 1 The second pad 14 shown is a ray formed by the endpoints in the up-down direction.

[0049] The utility model is based on an embodiment of the utility model, as Figures 1 to 3 As shown, the second pad 14 and the fourth pad 24 are located on the center line of the battery body 3 , and the center line is perpendicular to the first direction and divides the battery body 3 in half.

[0050] According to an embodiment of the present utility model, Figures 1 to 3 As shown, in the orthographic projection along the thickness direction of the battery body 3, the centers of the second welding pad 14 and the fourth welding pad 24 coincide with each other.

[0051] In an illustrative embodiment, Figures 1 to 3 As shown in FIG. 1 , the centers of the second pad 14 and the fourth pad 24 are located on the center line of the wide side of the battery body 3. Further, in the orthographic projection along the thickness direction of the battery body 3 (i.e., Figures 1 to 3 In the direction facing the paper surface), the midpoints of the second pad 14 and the fourth pad 24 coincide with each other.

[0052] According to another embodiment of the utility model, not shown in the figure, the second pad 14 is arranged between the center line of the battery body 3 and the first pad 12, and the fourth pad 24 is arranged between the center line of the battery body 3 and the third pad 22, and the center line is perpendicular to the first direction and bisects the battery body 3. Among them, in the orthographic projection along the thickness direction of the battery body 3, the center of the second pad 14 is misaligned with the center of the fourth pad 24. In an illustrative embodiment, not shown in the figure, the second pad 14 and the fourth pad 24 are arranged at a position closer to the center line of the wide side of the battery body 3 than the first pad 12 and the third pad 22, and do not coincide with the center line of the wide side of the battery body 3.

[0053] In such an embodiment, among the corresponding pads located on the two surfaces of the battery body 3, the closer the pads are to the middle of the battery body 3, the higher the overlap is. The higher the overlap of the two corresponding pads, the more conducive it is to compact the pads when welding with the solder strip, but it is also more likely to cause solder accumulation. For this reason, it is necessary to carry out an overall design from two aspects according to the position of the pad relative to the battery body 3. Since the strength of the part close to the middle of the battery body 3 is higher, the greater the extrusion force that can be tolerated, for this reason, the corresponding pads close to the middle of the battery body 3 can be set to partially overlap or completely overlap; the corresponding part of the battery body 3 close to the edge has a lower strength, and the smaller the extrusion force that can be tolerated, for this reason, the corresponding pads close to the edge of the battery body 3 can be set to partially overlap or completely misaligned, so as to take into account the requirements of both compaction welding and stress dispersion.

[0054] According to the embodiments of the present utility model, Figures 1 to 3 As shown, the battery cell also includes a fifth solder pad 13 arranged on the first surface and a sixth solder pad 23 arranged on the second surface, the fifth solder pad 13 is arranged between the first solder pad and the second solder pad, the sixth solder pad 23 is arranged between the third solder pad and the fourth solder pad, and the fifth solder pad 13 and the sixth solder pad 23 are arranged correspondingly up and down.

[0055] According to the embodiments of the present utility model, Figures 1 to 3As shown, in the orthographic projection along the thickness direction of the battery body 3, the distance between the center of the fifth pad 13 and the center of the sixth pad 23 is greater than the distance between the center of the second pad 14 and the center of the fourth pad 24, and is smaller than the distance between the center of the first pad 12 and the center of the third pad 22.

[0056] According to the embodiments of the present utility model, Figures 1 to 3 As shown, the battery cell also has a first main grid 15 disposed on the first surface of the battery body 3, and a second main grid 25 disposed on the second surface of the battery body 3, and the first main grid 15 and the second main grid 25 extend along a first direction parallel to the wide side of the battery body 3. The first main grid 15 passes through the first pad 12 and the second pad 14, and the second main grid 25 passes through the third pad 22 and the fourth pad 24.

[0057] In an illustrative embodiment, Figures 1 to 3 As shown, a first electrode 1 and a second electrode 2 are respectively arranged on the first surface and the second surface of the battery body 3 to collect and / or conduct the current generated by the battery body. In detail, the first electrode 1 includes a plurality of first main grids 15 evenly spaced on the first surface of the battery body 3, and the second electrode 2 includes a plurality of second main grids 25 evenly spaced on the second surface of the battery body 3, and the first main grids 15 and the second main grids 25 are both arranged along the extension direction parallel to the wide side of the battery body 3, and the plurality of first main grids 15 and the plurality of second main grids 25 are arranged at intervals along the extension direction of the long side of the battery body 3.

[0058] In an exemplary embodiment, the number of the first main grid 15 and the second main grid 25 includes but is not limited to 18. It should be understood that the embodiments of the present invention are not limited thereto.

[0059] For example, the number of busbars in each busbar unit can be configured to be 14, 15, 16, 17, 19, 20 or any other number to meet the current conduction efficiency of the photovoltaic module formed by the solar cells.

[0060] In an illustrative embodiment, Figures 1 to 3 As shown, the first main grid 15 also passes through the fifth pad 13. In detail, a second pad 14 is disposed in the middle of each first main grid 15. Further, a pair (i.e., two) first pads 12 and a pair (i.e., two) fifth pads 13 are symmetrically disposed on the first main grid 15 located on both sides of the second pad 14.

[0061] Similarly, the second main grid 25 also passes through the sixth pad 23. In detail, a fourth pad 24 is provided in the middle of each second main grid 25. Further, a pair (i.e., two) of third pads 22 and a pair (i.e., two) of sixth pads 23 are symmetrically provided on the second main grid 25 located on both sides of the fourth pad 24. It should be understood that the embodiments of the present utility model are not limited thereto.

[0062] For example, a plurality of fifth pads 13 may be disposed between the second pad 14 and the first pad 12 at intervals.

[0063] Similarly, a plurality of sixth pads 25 may be arranged between the fourth pad 24 and the third pad 22 , and the number of the fifth pad 13 and the sixth pad 23 should be constructed to be consistent so as to form a corresponding relationship in the orthographic projection in the thickness direction of the battery body 3 .

[0064] In an illustrative embodiment, Figure 1 As shown, the distance between the fifth pad 13 and the second pad 14 (i.e. Figure 1 The distance between the first pad 12 and the fifth pad 13 (ie, d3 = 19.65 mm) includes but is not limited to being configured as 19.65 mm (ie, d3 = 19.65 mm). Figure 1 d2 as shown) includes but is not limited to being configured as 21.41 mm (ie, d2 = 21.41 mm). Furthermore, the spacing between the first welding pad 12 and the long side of the battery body 3 (ie, Figure 1 The d1) shown includes but is not limited to being configured to be 6.84 mm (ie, d1 = 6.84 mm).

[0065] In an illustrative embodiment, Figure 2 As shown, the distance between the sixth pad 23 and the fourth pad 24 (i.e. Figure 2 The d6 shown in the figure is configured to be 19.95 mm (ie, d6 = 19.95 mm). Further, the spacing between the third pad 22 and the sixth pad 23 (ie, Figure 2 The distance between the third welding pad 22 and the long side of the battery body 3 (ie, d5 = 19.95 mm) includes but is not limited to being configured as 19.95 mm (ie, d5 = 19.95 mm). Figure 2 The d4) shown includes but is not limited to being configured to be 8 mm (ie d4=8 mm).

[0066] In such an embodiment, in the main grid (i.e., the first main grid 15 and the second main grid 25) based on the above-mentioned screen design, the spacing between the second pad 14 and the fifth pad 13 of the first main grid 15 (i.e., d3) is smaller than the spacing between the fourth pad 24 and the sixth pad 23 of the second main grid 2 (i.e., d6), and the spacing between the first pad 12 and the fifth pad 13 of the first main grid 1 (i.e., d2) is greater than the spacing between the third pad 22 and the sixth pad 23 of the second main grid 2 (i.e., d5).

[0067] In an illustrative embodiment, the first pad 12, the second pad 14, the third pad 22, the fourth pad 24, the fifth pad 13 and the sixth pad 23 include but are not limited to being configured in any one of a rectangle, a chamfered rectangle, a circle, an ellipse and a racetrack shape.

[0068] In an illustrative embodiment, Figures 1 to 3 As shown, the second pad 14, the fifth pad 13, the fourth pad 24 and the second pad 14 include but are not limited to being configured as a 0.8mm×0.6mm rectangular structure. Further, the first pad 12 and / or the third pad 22 include but are not limited to being configured as a 1mm×0.8mm rectangular structure.

[0069] Figure 4 yes Figure 3 A partial enlarged view of part A of the battery cell shown. Figure 5 yes Figure 4 A partial enlarged view of part B of the battery cell is shown. Figure 6 yes Figure 4 A partial enlarged view of portion C of the battery cell shown.

[0070] According to the embodiments of the present utility model, Figure 4 and Figure 5 As shown, in the orthographic projection along the thickness direction of the battery body 3 , the first welding pad 12 and the third welding pad 22 are staggered.

[0071] According to the embodiments of the present utility model, Figure 4 and Figure 6 As shown, in the orthographic projection along the thickness direction of the battery body 3 , the fifth welding pad 13 and the sixth welding pad 23 partially overlap.

[0072] In an illustrative embodiment, Figure 4 As shown, in the orthographic projection of the thickness direction of the battery body 3 (i.e., the direction facing the paper), the position difference between the second pad 14 and the fourth pad 24 along the extension direction of the wide side of the battery body 3 (i.e., the left-right direction) is the smallest (i.e., they roughly overlap); Figure 5As shown, the position difference between the fifth pad 13 and the sixth pad 23 along the extension direction (i.e., the left-right direction) of the wide side of the battery body 3 is second (i.e., the centers of the fifth pad 13 and the sixth pad 23 are misaligned along the second direction, but the fifth pad 13 and the sixth pad 23 are still partially overlapped); Figure 6 As shown, the first pad 12 and the third pad 22 have the largest position difference (i.e., non-overlapping) along the extension direction (i.e., left-right direction) of the wide side of the battery body 3. In this way, it can adapt to the characteristic that the strength of the battery body 3 decreases as it approaches the edge, improve the problem of stress concentration of the battery body 3, and prevent the risk of hidden cracks and fragments at the edge of the battery body 3. It should be understood that the embodiments of the utility model are not limited to this.

[0073] For example, a plurality of pairs of fifth pads 13 and sixth pads 23 of the same number may be configured on each main grid (i.e., each pair includes one fifth pad 13 and one sixth pad 23), and the overlap of a pair of fifth pads 13 and sixth pads 23 near the middle of the battery body 3 is higher than the overlap of a pair of fifth pads 13 and sixth pads 23 near the edge of the battery body 3. The overlap includes but is not limited to the spacing between the centers of the fifth pad 13 and the sixth pad, and the smaller the spacing, the higher the overlap, and the overlap does not mean that the fifth pad 13 and the sixth pad 23 at least partially overlap.

[0074] According to the embodiments of the present utility model, Figure 4 and Figure 5 As shown, the battery cell also includes a first harpoon structure 11 located on the first surface and a second harpoon structure 21 located on the second surface, the first harpoon structure 11 is connected to the first pad 12, the second harpoon structure 21 is connected to the third pad 22, and the first harpoon structure 11 is connected along the first direction (such as Figure 4 The width of the second harpoon structure 21 in the first direction (as shown in the vertical direction) is greater than that of the second harpoon structure 21 in the first direction (as shown in the vertical direction) Figure 4 The width in the up and down directions shown.

[0075] In an illustrative embodiment, Figure 4 and Figure 5 As shown, the cell also has a first harpoon structure 11 disposed on the first surface and a second harpoon structure 21 disposed on the second surface. In detail, the first harpoon structure 11 is connected to the first pad 12, and the second harpoon structure 21 is connected to the third pad 22. Further, the first harpoon structure 11 is disposed at both ends of the first main grid 15 (such as Figure 4 The second harpoon structure 21 is disposed at both ends of the second main grid 25 (such as Figure 4 Furthermore, the first harpoon structure 11 and the second harpoon structure 21 are staggered, and the spacing of the staggered arrangement is constructed to be substantially the same as the spacing between the midpoints of the first pad 12 and the third pad 22.

[0076] In such an embodiment, the edge current of the battery body 3 can be collected by the harpoon structure (i.e., the first harpoon structure 11 and the second harpoon structure 21) formed on the main grid, and when the end pad is welded to the external welding strip, a cold weld is not likely to occur. The second harpoon structure 21 is staggered relative to the first harpoon structure 11, which can further prevent stress concentration at the edge of the battery body 3.

[0077] In an exemplary embodiment, the first harpoon structure 11 and the second harpoon structure 21 include but are not limited to being configured as a rectangular structure with an opening on one side. Specifically, the spacing between the two ends of the inner wall of the opening includes but is not limited to being configured as 1.6 mm.

[0078] In an exemplary embodiment, the screen design line width of the connection lines of the main grid (ie, the first main grid 15 and the second main grid 25) includes, but is not limited to, 30 μm. Further, the line width after printing includes, but is not limited to, 45 μm to 70 μm.

[0079] In an illustrative embodiment, Figures 1 to 3 As shown, the first main grid 15 and the second main grid 25 are arranged along the extension direction (such as Figure 1 A plurality of antennae are arranged at intervals in the left and right directions (shown in the figure), and each antennae is configured to be electrically connected to a sub-grid extending along the second direction. Further, the width of the antennae is configured to be greater than the width of the connected sub-grid (not shown in the figure).

[0080] In an illustrative embodiment, Figure 1 As shown, two first antennae 16 are provided at intervals on the first main grid 15 between the first pad 12 and the fifth pad 13 and between the fifth pad 13 and the second pad 14 .

[0081] In an illustrative embodiment, Figure 2 As shown, there are provided, including but not limited to, five or six antennae at intervals on the second main grid 25 between the third pad 22 and the sixth pad 23 and between the sixth pad 23 and the fourth pad 24 .

[0082] For example, five second antennae 26 are arranged between the third pad 22 and the sixth pad 23, and six second antennae 26 are arranged between the sixth pad 23 and the fourth pad 24. In an exemplary embodiment, the antennae (i.e., the first antennae 16 and the second antennae 26) include but are not limited to being configured as a rectangular structure. In detail, each antennae is suitable for connecting to a secondary grid (not shown in the figure). Further, the width of each antennae (e.g., Figures 1 to 3The spacing between the left and right ends of the main grid) is constructed to be larger than the width of the auxiliary grid, so that it covers and is electrically connected to the auxiliary grid after printing to increase the welding characteristics between the main grid and the external welding ribbon to provide welding tension.

[0083] Based on the same inventive concept as the battery cell, the utility model also provides a photovoltaic module, including a battery cell layer and a sealing layer. The battery cell layer includes a plurality of battery cells, and the plurality of battery cells are arranged along rows and / or columns. The sealing layer is laminated on the surface of the battery cell layer.

[0084] In an exemplary embodiment, the sealing layer is laminated on the front and back sides of the battery cell layer (ie, the first surface and the second surface of the battery cell) to form a laminate with the battery cell layer.

[0085] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only for reference to the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted when they may cause confusion in the understanding of the present invention.

[0086] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present invention is defined by the attached claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A battery body (3) having a first surface and a second surface that are separated from each other; as well as A first solder pad (12) and a second solder pad (14) are disposed on the first surface and arranged along a first direction, and a third solder pad (22) and a fourth solder pad (24) are disposed on the second surface and arranged along the first direction, wherein the first solder pad (12) and the third solder pad (22) are close to the edge of the battery body (3), and the second solder pad (14) and the fourth solder pad (24) are close to the middle of the battery body (3); The first soldering pad (12) and the third soldering pad (22) are arranged correspondingly up and down, and the second soldering pad (14) and the fourth soldering pad (24) are arranged correspondingly up and down, and in the orthographic projection along the thickness direction of the battery body (3), the distance between the center of the first soldering pad (12) and the center of the third soldering pad (22) is greater than the distance between the center of the second soldering pad (14) and the center of the fourth soldering pad (24).

2. The battery cell according to claim 1, characterized in that: The second welding pad (14) and the fourth welding pad (24) are located on the center line of the battery body (3), and the center line is perpendicular to the first direction and bisects the battery body (3).

3. The battery cell according to claim 2, characterized in that: In the orthographic projection along the thickness direction of the battery body (3), the centers of the second welding pad (14) and the fourth welding pad (24) coincide with each other.

4. The battery cell according to claim 1, characterized in that: The second welding pad (14) is arranged between the center line of the battery body (3) and the first welding pad (12), and the fourth welding pad (24) is arranged between the center line of the battery body (3) and the third welding pad (22), the center line is perpendicular to the first direction and bisects the battery body (3); Wherein, in the orthographic projection along the thickness direction of the battery body (3), the center of the second welding pad (14) and the center of the fourth welding pad (24) are misaligned.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The invention also comprises a fifth solder pad (13) arranged on the first surface and a sixth solder pad (23) arranged on the second surface, wherein the fifth solder pad (13) is arranged between the first solder pad and the second solder pad, and the sixth solder pad (23) is arranged between the third solder pad and the fourth solder pad, and the fifth solder pad (13) and the sixth solder pad (23) are arranged correspondingly up and down.

6. The battery cell according to claim 5, characterized in that: In the orthographic projection along the thickness direction of the battery body (3), the distance between the center of the fifth welding pad (13) and the center of the sixth welding pad (23) is greater than the distance between the center of the second welding pad (14) and the center of the fourth welding pad (24), and is smaller than the distance between the center of the first welding pad (12) and the center of the third welding pad (22).

7. The battery cell according to claim 6, characterized in that: In the orthographic projection along the thickness direction of the battery body (3), the fifth welding pad (13) and the sixth welding pad (23) partially overlap.

8. The battery cell according to claim 7, characterized in that: In an orthographic projection along the thickness direction of the battery body (3), the first welding pad (12) and the third welding pad (22) are arranged in a staggered manner.

9. The battery cell according to any one of claims 1 to 4, characterized in that: It also comprises a first main grid (15) arranged on the first surface of the battery body (3) and extending along the first direction, and a second main grid (25) arranged on the second surface of the battery body (3) and extending along the first direction, wherein the first main grid (15) and the second main grid (25) extend in a direction parallel to the wide side of the battery body (3); The first main grid (15) passes through the first pad (12) and the second pad (14), and the second main grid (25) passes through the third pad (22) and the fourth pad (24).

10. The battery cell according to claim 1, characterized in that: It also includes a first harpoon structure (11) located on the first surface and a second harpoon structure (21) located on the second surface, the first harpoon structure (11) is connected to the first solder pad (12), the second harpoon structure (21) is connected to the third solder pad (22), and the width of the first harpoon structure (11) along the first direction is greater than the width of the second harpoon structure (21) along the first direction.

11. A photovoltaic module, characterized in that: include: A battery cell layer, comprising a plurality of battery cells as claimed in any one of claims 1 to 10, wherein the plurality of battery cells are arranged along rows and / or columns; as well as The sealing layer is laminated on the surface of the battery sheet layer.

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