Photovoltaic cell piece, photovoltaic cell string and photovoltaic module

Abstract

The utility model discloses a photovoltaic cell sheet, a photovoltaic cell string and a photovoltaic assembly. The photovoltaic cell sheet comprises a cell sheet body; the plurality of grid lines are arranged on at least one surface of the battery piece body in the first direction, the plurality of grid lines are spaced along the second direction, each grid line extends along the third direction, and the first direction, the second direction and the third direction are mutually orthogonal; the plurality of welding strips are in one-to-one correspondence with the plurality of grid lines, the plurality of welding strips are spaced along a second direction, each welding strip extends along a third direction, and each welding strip is arranged on one side, far away from the battery piece body, of the corresponding grid line; and the first bus electrode is arranged on one side of the battery piece body in the first direction, and the first bus electrode is located between the grid line and the welding strip. According to the photovoltaic cell piece provided by the utility model, the photoelectric conversion efficiency of the photovoltaic cell piece is improved, the optical loss is reduced, the weight and the cost of the photovoltaic cell piece are reduced, and the lightweight design of the photovoltaic cell piece is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell technology field especially is related to a photovoltaic cell piece, photovoltaic cell string and photovoltaic module. BACKGROUND

[0002] In the related art, the solar cell piece is provided with a main grid and a sub grid, and a welding strip is welded on the main grid, at this time, the current collection path is the sub grid-main grid-welding strip, which leads to a long current transmission path, causes large electrical loss in the current transmission process, and affects the photoelectric conversion efficiency. In addition, the main grid laid on the photovoltaic cell piece causes more light blocking of the photovoltaic cell piece, thereby increasing the optical loss of the cell. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a photovoltaic cell piece, which improves the photoelectric conversion efficiency of the photovoltaic cell piece, reduces the optical loss, and reduces the weight and cost of the photovoltaic cell piece, which is beneficial to the lightweight design of the photovoltaic cell piece.

[0004] Another purpose of the utility model is to provide a photovoltaic cell string comprising the above photovoltaic cell piece.

[0005] Still another purpose of the utility model is to provide a photovoltaic module comprising the above photovoltaic cell string.

[0006] According to the photovoltaic cell piece of the first aspect of the utility model, the cell piece body, a plurality of grid lines, a plurality of welding strips, and a first bus electrode are provided. The plurality of grid lines are arranged on at least one surface of the cell piece body in a first direction, and are spaced apart along a second direction. Each grid line extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The plurality of welding strips correspond one-to-one to the plurality of grid lines, and are spaced apart along the second direction. Each welding strip extends along the third direction, and is arranged on the side of the corresponding grid line away from the cell piece body. The first bus electrode is arranged on one side of the cell piece body in the first direction, and is located between the grid lines and the welding strips.

[0007] According to the photovoltaic cell piece of the utility model embodiment, the welding strip and the grid line are arranged in parallel, and the first bus electrode is electrically connected with the plurality of welding strips. Thus, compared with the traditional solar cell piece, the main grid and part of the sub grid are saved, the current transmission path is shortened, the electrical loss is reduced, the photoelectric conversion efficiency of the photovoltaic cell piece is improved, the weight and cost of the photovoltaic cell piece are reduced, and the lightweight design of the photovoltaic cell piece is facilitated.

[0008] According to some embodiments of the present application, the width of the first busbar in the third direction is W1, and the minimum distance between the first busbar and the edge of the cell body in the third direction is H1, wherein the W1 and H1 respectively satisfy: 1mm≤W1≤4mm, and 1mm≤H1≤2mm.

[0009] According to some embodiments of the present application, the thickness of the first busbar in the first direction is D1, wherein the D1 satisfies: 5um≤D1≤30um.

[0010] According to some embodiments of the present application, the outer diameter of each solder strip is greater than the outer diameter of each grid line; the outer diameter of each solder strip is D2, and the outer diameter of each grid line is D3, wherein the D2 and D3 respectively satisfy: 0.05mm≤D2≤0.2mm, and 5um≤D3≤30um.

[0011] According to some embodiments of the present application, the length of each solder strip in the third direction is less than the length of each grid line; in the third direction, the minimum distance between the end of each solder strip and the end of each grid line is H2, wherein the H2 satisfies: 0.5mm≤H2≤1mm.

[0012] According to some embodiments of the present application, the plurality of grid lines comprises a plurality of front grid lines and a plurality of back grid lines, the plurality of front grid lines and the plurality of back grid lines are respectively arranged on the two surfaces of the cell body in the first direction; the plurality of solder strips comprises a plurality of front solder strips and a plurality of back solder strips, the front solder strips are connected with the front grid lines, the back solder strips are connected with the back grid lines, and the first busbar is electrically connected with the plurality of back solder strips.

[0013] According to some embodiments of the present application, in the third direction, one end of each front solder strip away from the first busbar extends out of the cell body, and the part of each front solder strip extending out of the cell body is adapted to be connected with the first busbar of the adjacent photovoltaic cell.

[0014] According to some embodiments of the present application, in the third direction, the length of each front solder strip extending out of the cell body is L1, wherein the L1 satisfies: 3mm≤L1≤7mm.

[0015] According to some embodiments of the present application, the length of the back surface solder strip overlapping on the first bus electrode in the third direction is L2, and the length of each front surface solder strip overlapping on the first bus electrode of the adjacent photovoltaic cell in the third direction is L3, wherein the L2, L3 and W1 satisfy: 2 / 3W1≤L2≤W1 and 2 / 3W1≤L3≤W1.

[0016] According to some embodiments of the present application, the end of each front surface solder strip extending out of the cell body in the third direction is located in the first bus electrode of the adjacent photovoltaic cell.

[0017] According to some embodiments of the present application, the photovoltaic cell further comprises a second bus electrode, which is arranged on the other side of the cell body in the first direction, and is located between the front surface solder strip and the front surface grid line.

[0018] According to some embodiments of the present application, the length of the front surface solder strip overlapping on the second bus electrode in the third direction is L4, and the width of the second bus electrode in the third direction is W2, wherein the L4 and W2 satisfy: 2 / 3W2≤L4≤W2.

[0019] According to some embodiments of the present application, the first bus electrode and the second bus electrode are respectively located at the two ends of the cell body in the third direction.

[0020] According to some embodiments of the present application, the photovoltaic cell further comprises a conductive connecting piece, one end of which is connected with the front surface solder strip, and the other end of which is adapted to be connected with the back surface solder strip of the adjacent photovoltaic cell.

[0021] According to some embodiments of the present application, the thickness of the conductive connecting piece in the first direction is D4, wherein the D4 satisfies: 0.1mm≤D4≤0.4mm.

[0022] According to some embodiments of the present application, the thickness of the second bus electrode in the first direction is D5, wherein the D1 and D5 respectively satisfy: 5um≤D1≤30um and 5um≤D5≤30um.

[0023] According to some embodiments of the present application, the number of the front surface solder strips is the same as that of the back surface solder strips, the number of the front surface solder strips is N, and the length of the cell body in the second direction is L5, wherein the N and L5 satisfy: 0.5≤L5 / N≤2.

[0024] The photovoltaic cell string according to the second aspect of the present utility model comprises the photovoltaic cell piece according to the first aspect of the present utility model.

[0025] The photovoltaic module according to the third aspect of the present utility model comprises the photovoltaic cell string according to the second aspect of the present utility model.

[0026] Additional aspects and advantages of the present utility model will be in part apparent and in part pointed out hereinafter in the description of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the present utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 It is the front view schematic diagram of the photovoltaic cell piece according to the embodiment of the present utility model, wherein the solder strip is not shown;

[0029] Figure 2 It is the back view schematic diagram of the photovoltaic cell piece according to the embodiment of the present utility model, wherein the solder strip is not shown;

[0030] Figure 3 It is the front view schematic diagram of the photovoltaic cell piece according to the embodiment of the present utility model;

[0031] Figure 4 It is the back view schematic diagram of the photovoltaic cell piece according to the embodiment of the present utility model;

[0032] Figure 5 It is the schematic diagram of the photovoltaic cell string according to the embodiment of the present utility model;

[0033] Figure 6 It is the front view schematic diagram of the photovoltaic cell piece according to another embodiment of the present utility model, wherein the solder strip is not shown;

[0034] Figure 7 It is the front view schematic diagram of the photovoltaic cell piece according to another embodiment of the present utility model;

[0035] Figure 8 It is the front view schematic diagram of the photovoltaic cell string according to another embodiment of the present utility model;

[0036] Figure 9 It is the back view schematic diagram of the photovoltaic cell string according to another embodiment of the present utility model.

[0037] Reference Signs List:

[0038] 100, photovoltaic cell;

[0039] 110, cell body; 120, grid line; 121, front grid line; 122, back grid line; 130, solder strip; 131, front solder strip; 132, back solder strip; 140, first bus electrode; 150, second bus electrode;

[0040] 200, photovoltaic cell string; 210, conductive connecting piece. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary, and the following description is made with reference to Figures 1-7 The photovoltaic cell 100 according to the first aspect of the present application is described below.

[0042] As shown in Figures 1-5 The photovoltaic cell 100 according to the first aspect of the present application includes a cell body 110, a plurality of grid lines 120, a plurality of solder strips 130, and a first bus electrode 140. In the description of the present application, "a plurality of" means two or more.

[0043] Specifically, the plurality of grid lines 120 are arranged on at least one surface of the cell body 110 in a first direction (not shown in the figure), the plurality of grid lines 120 are spaced apart along a second direction (for example, the left-right direction in Figure 1 ), each grid line 120 extends along a third direction (for example, the up-down direction in Figure 1 ), and the first direction, the second direction, and the third direction are orthogonal to each other. The plurality of solder strips 130 correspond one-to-one to the plurality of grid lines 120, the plurality of solder strips 130 are spaced apart along the second direction, each solder strip 130 extends along the third direction, and each solder strip 130 is arranged on a side of the corresponding grid line 120 away from the cell body 110. The first bus electrode 140 is arranged on a side of the cell body 110 in the first direction, and the first bus electrode 140 is located between the grid lines 120 and the solder strips 130.

[0044] It should be noted that the present application takes the photovoltaic cell 100 as an example for description, but is not limited thereto. The first direction can be the thickness direction of the half-cell, the second direction can be the length direction of the half-cell, and the third direction can be the width direction of the half-cell.

[0045] For example, in Figures 1-5In the example shown in FIG. 1, a plurality of grid lines 120 are arranged on the front surface and the back surface of the cell body 110, and the plurality of grid lines 120 are uniformly spaced apart along the length direction of the cell body 110, and each grid line 120 extends along the width direction of the cell body 110. The solder strip 130 is opposite to the grid line 120 in the thickness direction of the cell body 110, that is, the solder strip 130 is parallel to the grid line 120, and the solder strip 130 is connected to the side of the grid line 120 away from the cell body 110. The first bus electrode 140 is arranged on the back surface of the cell body 110, and is located at the plurality of solder strips 130 on the back surface of the cell body.

[0046] When light irradiates on the cell body 110, the cell body 110 generates current due to photovoltaic effect, and at this time, the current can be transmitted to the solder strip 130 through the grid line 120, and then collected to the first bus electrode 140 through the plurality of solder strips 130, and finally guided out through the first bus electrode 140. Therefore, while ensuring that the current generated by the cell body 110 can be guided out, the main grid is saved, so that the current transmission path can be shortened, the photoelectric conversion efficiency of the photovoltaic cell 100 is improved, and the weight and cost of the photovoltaic cell 100 are reduced, which is beneficial to the lightweight design of the photovoltaic cell 100.

[0047] In addition, the plurality of solder strips 130 can be arranged only on the front surface of the cell body 110 (not shown in the figure); or the plurality of solder strips 130 can be arranged only on the back surface of the cell body 110 (not shown in the figure).

[0048] According to the photovoltaic cell 100 of the embodiment of the present application, the solder strip 130 is arranged in parallel with the grid line 120, and the first bus electrode 140 is electrically connected with the plurality of solder strips 130. Therefore, compared with the traditional solar cell, the main grid and part of the auxiliary grid are saved, the current transmission path is shortened, the electrical loss is reduced, the photoelectric conversion efficiency of the photovoltaic cell 100 is improved, and the weight and cost of the photovoltaic cell 100 are reduced, which is beneficial to the lightweight design of the photovoltaic cell 100.

[0049] Specifically, the width of the first bus electrode 140 in the third direction is W1, and the minimum distance between the first bus electrode 140 and the edge of the cell body 110 in the third direction is H1, wherein W1 and H1 respectively satisfy: 1mm≤W1≤4mm, 1mm≤H1≤2mm.

[0050] When W1<1mm, the width of the first bus electrode 140 in the third direction is small, the overlap area of the solder strip 130 and the first bus electrode 140 is small, thereby causing the solder strip 130 and the first bus electrode 140 to be unable to effectively overlap, thereby affecting the normal use of the photovoltaic cell 100; when W1>4mm, the width of the first bus electrode 140 in the third direction is large, the weight and cost of the photovoltaic cell 100 are increased, which is not conducive to the lightweight design of the photovoltaic cell 100, and the width of the first bus electrode 140 is large, which will shield part of the cell body 110, thereby reducing the photoelectric conversion rate of the photovoltaic cell 100. When H1<1mm, the minimum distance between the first bus electrode 140 and the edge of the cell body 110 is small, the requirement for the processing technology is high, and the end surface of the first bus electrode 140 is easy to protrude from the cell body 100, which is not conducive to the overall aesthetics of the photovoltaic cell 100; when H1>2mm, the minimum distance between the first bus electrode 140 and the edge of the cell body 110 is large, thereby reducing the space utilization rate of the cell body 110, and in the limited size of the cell body 110, the minimum distance between the first bus electrode 140 and the edge of the cell body 110 is too large, which shortens the width of the negative first bus electrode 140, and also affects the output power of the photovoltaic cell 100.

[0051] Therefore, the width W1 of the first bus electrode 140 is set to be between 1mm and 4mm, which not only ensures the photoelectric conversion rate, but also enables the solder strip 130 and the first bus electrode 140 to effectively overlap, and also reduces the weight and cost of the photovoltaic cell 100. The minimum distance between the first bus electrode 140 and the edge of the cell body 110 is set to be between 1mm and 2mm, which not only reduces the requirement for the processing technology, but also improves the space utilization rate of the cell body 110, thereby ensuring the output power of the photovoltaic cell 100.

[0052] According to some optional embodiments of the present application, the thickness of the first bus electrode 140 in the first direction is D1, wherein D1 satisfies: 5um≤D1≤30um.

[0053] When D1<5um, the thickness of the first bus electrode 140 is small, and the conductivity of the first bus electrode 140 may not meet the current demand of the photovoltaic cell 100, thereby affecting the overall output power of the photovoltaic cell 100; when D1>30um, the thickness of the first bus electrode 140 is increased, thereby increasing the manufacturing cost and weight, which is not conducive to the lightweight design of the photovoltaic cell 100, and the thickness of the first bus electrode 140 is too large, which will cause part of the current transmission loss between the first bus electrode 140 and the solder strip 130. Therefore, the thickness D1 of the first bus electrode 140 is set to be between 5um and 30um, which not only ensures the electrical performance of the photovoltaic cell 100, but also controls the manufacturing cost of the photovoltaic cell 100.

[0054] Further, the thickness D1 of the first busbar 140 in the first direction satisfies: 5um≤D1≤20um. In this way, the electrical performance of the photovoltaic cell 100 is ensured, and the manufacturing cost of the photovoltaic cell 100 is controlled.

[0055] Specifically, the outer diameter of each solder strip 130 is greater than the outer diameter of each grid line 120. The outer diameter of each solder strip 130 is D2, and the outer diameter of each grid line 120 is D3, where D2 and D3 respectively satisfy: 0.05mm≤D2≤0.2mm, and 5um≤D3≤30um. In this way, the solder strip can completely cover the grid line, ensuring the electrical performance of the photovoltaic cell 100.

[0056] When D2<0.05mm, the solder strip 130 cannot completely cover the grid line 120, resulting in electrical loss; when D2>0.2mm, the outer diameter of the solder strip 130 increases, increasing the manufacturing cost and weight, which is not conducive to the lightweight design of the photovoltaic cell 100. When D3<5um, the outer diameter of the grid line 120 is small, and the conductivity of the grid line 120 may not meet the current demand of the photovoltaic cell 100, thereby affecting the overall conductivity of the photovoltaic cell 100; when D3>30um, the outer diameter of the grid line 120 is large, increasing the manufacturing cost and weight, which is not conducive to the lightweight design of the photovoltaic cell 100.

[0057] In some preferred embodiments, the outer diameter D3 of each grid line 120 satisfies: 0.5um≤D3≤4um. In this way, the amount of silver paste is further saved, thereby saving the manufacturing cost and reducing the weight, which is conducive to the lightweight design of the photovoltaic cell 100.

[0058] Further, the length of each solder strip 130 in the third direction is less than the length of each grid line 120. In the third direction, the minimum distance between the end of each solder strip 130 and the end of each grid line 120 is H2, where H2 satisfies: 0.5mm≤H2≤1mm. In this way, in the third direction, the end surface of the solder strip 130 will not exceed the end surface of the grid line 120, and the cell body 110 will not be cracked during welding, thereby improving the yield of the photovoltaic cell 100.

[0059] When H2<0.5mm, the minimum distance between the end of the solder strip 130 and the end of the grid line 120 is small, which is easy to cause the cell body 110 to be cracked during welding, thereby affecting the normal use of the photovoltaic cell 100; when H2>1mm, the minimum distance between the end of the solder strip 130 and the end of the grid line 120 is large, that is, the length of the solder strip 130 is short, and the conductivity of the solder strip 130 cannot match the current transmission demand of the grid line 120, thereby affecting the output power of the photovoltaic cell 100 and causing electrical loss.

[0060] Therefore, the minimum distance H2 between the end of the solder ribbon 130 and the end of the grid line 120 is set between 0.5mm and 1mm, which ensures that the cell body 110 will not crack during welding and also ensures the electrical performance of the photovoltaic cell 100. According to some embodiments of this utility model, the plurality of grid lines 120 include a plurality of front grid lines 121 and a plurality of back grid lines 122, which are respectively disposed on two surfaces of the cell body 110 in a first direction. The plurality of solder ribbons 130 include a plurality of front solder ribbons 131 and a plurality of back solder ribbons 132, with the front solder ribbons 131 connected to the front grid lines 121 and the back solder ribbons 132 connected to the back grid lines 122. The first bus electrode 140 is electrically connected to the plurality of back solder ribbons 132. The length of the back solder ribbons 132 in the third direction is greater than or equal to the length of the back grid lines 122, and the length of the back solder ribbons 132 in the third direction is less than the width of the cell body 110.

[0061] In other words, the two end faces of the back solder strip 132 on the third side can be flush with the two end faces of the back grid line 122 (e.g.) Figure 3 (as shown); or, on the third-side upward direction, the two end faces of the back solder strip 132 protrude from the two end faces of the back grid line 122 respectively (not shown); or, on the third-side upward direction, one end of the back solder strip 132 is flush with one end of the back grid line 122, and the other end of the back solder strip 132 protrudes from the other end of the back grid line 122 (not shown). This facilitates the connection of the end or at least part of the back solder strip 132 to the first bus electrode 140, and the length of the back solder strip 132 on the third-side upward direction is less than the width of the cell body 110, meaning the back solder strip 132 does not extend beyond the cell body 110, fully utilizing the space on the back of the cell body 110, and further reducing the weight and cost of the photovoltaic cell 100.

[0062] According to some embodiments of this utility model, one end of each front-side solder strip 131, away from the first bus electrode 140, extends out of the cell body 110. The portion of each front-side solder strip 131 extending out of the cell body 110 is adapted to connect with the first bus electrode 140 of the adjacent photovoltaic cell 100. In this way, the portion of the front-side solder strip 131 extending out of the cell body 110 can be electrically connected to the first bus electrode 140 on another cell body 110. With this arrangement, multiple photovoltaic cells 110 can be connected in series to form a photovoltaic cell string 200, ensuring the photoelectric conversion efficiency of the photovoltaic cell string 200.

[0063] Further, the length of each front-side solder strip 131 extending out of the cell body 110 in the third direction is L1, where 3mm≤L1≤7mm. When L1<3mm, the front-side solder strip 131 cannot effectively overlap the first bus electrode 140, which is not conducive to the electrical connection between the front-side solder strip 131 and the first bus electrode 140 of the adjacent photovoltaic cell 110, and affects the production efficiency of the photovoltaic cell string 200. When L1>7mm, the length of the front-side solder strip 131 is too long, which increases the weight and cost of the photovoltaic cell 100.

[0064] Therefore, the length L1 of each front-side solder strip 131 extending out of the cell body 110 in the third direction is set to be between 3mm and 7mm, which not only ensures the effective overlap between the front-side solder strip 131 and the first bus electrode 140, but also reduces the manufacturing cost and weight, and is conducive to the lightweight design of the photovoltaic cell 100.

[0065] Further, the length L1 of each front-side solder strip 131 extending out of the cell body 110 in the third direction is 3mm≤L1≤6mm. In this way, the effective overlap between the front-side solder strip 131 and the first bus electrode 140 is ensured, and the manufacturing cost and weight are reduced, which is conducive to the lightweight design of the photovoltaic cell 100.

[0066] According to some specific embodiments of the present application, the length of the back-side solder strip 132 overlapping the first bus electrode 140 in the third direction is L2, and the length of each front-side solder strip 131 overlapping the first bus electrode 140 of the adjacent photovoltaic cell 100 in the third direction is L3, where 2 / 3W1≤L2≤W1 and 2 / 3W1≤L3≤W1.

[0067] When L2<2 / 3W1, the length of the back-side solder strip 132 overlapping the first bus electrode 140 in the third direction is too short, and the reliability of the connection between the back-side solder strip 132 and the first bus electrode 140 is poor. When L2>W1, the end of the back-side solder strip 132 in the third direction exceeds the first bus electrode 140, which increases the manufacturing cost and weight, and is not conducive to the lightweight design of the photovoltaic cell 100.

[0068] Therefore, the length L2 of the back-side solder strip 132 overlapping the first bus electrode 140 in the third direction is set to be between 2 / 3W1 and W1, which not only ensures the effective overlap between the back-side solder strip 132 and the first bus electrode 140, but also reduces the manufacturing cost and weight, and is conducive to the lightweight design of the photovoltaic cell 100.

[0069] When L3<2 / 3W1, the length of the front-side ribbon 131 overlapping on the first busbar 140 of the adjacent photovoltaic cell 100 in the third direction is short, and the reliability of the connection between the front-side ribbon 131 and the second busbar 150 is poor; when L3>W1, the length of the front-side ribbon 131 in the third direction is long, which increases the manufacturing cost and weight, and is not conducive to the lightweight design of the photovoltaic cell 100.

[0070] Therefore, the length L3 of the front-side ribbon 131 overlapping on the second busbar 150 of the adjacent photovoltaic cell 100 in the third direction is set to be between 2 / 3W1 and W1, which not only ensures the effective overlapping of the front-side ribbon 131 and the second busbar 150 of the adjacent photovoltaic cell 100, but also reduces the manufacturing cost and weight, and is conducive to the lightweight design of the photovoltaic cell 100.

[0071] According to some optional embodiments of the present application, the end portion of each front-side ribbon 131 extending out of the cell body 110 in the third direction is located in the first busbar 140 of the adjacent photovoltaic cell 100. In this way, the front-side ribbon 131 and the first busbar 140 of the adjacent photovoltaic cell 100 are effectively overlapped, the manufacturing cost and weight are reduced, and the lightweight design of the photovoltaic cell 100 is facilitated.

[0072] According to some optional embodiments of the present application, the end portion of each front-side ribbon 131 extending out of the cell body 110 in the third direction is located in the first busbar 140 of the adjacent photovoltaic cell 100. In this way, the front-side ribbon 131 and the first busbar 140 of the adjacent photovoltaic cell 100 are effectively overlapped, the manufacturing cost and weight are reduced, and the lightweight design of the photovoltaic cell 100 is facilitated. Figure 6 Figure 7 According to some optional embodiments of the present application, the end portion of each front-side ribbon 131 extending out of the cell body 110 in the third direction is located in the first busbar 140 of the adjacent photovoltaic cell 100. In this way, the front-side ribbon 131 and the first busbar 140 of the adjacent photovoltaic cell 100 are effectively overlapped, the manufacturing cost and weight are reduced, and the lightweight design of the photovoltaic cell 100 is facilitated. Figure 6 Figure 7 According to some optional embodiments of the present application, the end portion of each front-side ribbon 131 extending out of the cell body 110 in the third direction is located in the first busbar 140 of the adjacent photovoltaic cell 100. In this way, the front-side ribbon 131 and the first busbar 140 of the adjacent photovoltaic cell 100 are effectively overlapped, the manufacturing cost and weight are reduced, and the lightweight design of the photovoltaic cell 100 is facilitated.

[0073] According to some embodiments of the present application, the length of the front-side ribbon 131 overlapping on the second busbar 150 in the third direction is L4, and the width of the second busbar 150 in the third direction is W2, wherein L4 and W2 satisfy: 2 / 3W2≤L4≤W2.

[0074] ​​When L4<2 / 3W2, the length of the front-side solder strip 131 overlapping on the second bus electrode 150 in the third direction is short, and the reliability of the connection between the front-side solder strip 131 and the second bus electrode 150 is poor; when L4>W2, the front-side solder strip 131 exceeds the second bus electrode 150 in the third direction, which increases the manufacturing cost and weight, and is not conducive to the lightweight design of the photovoltaic cell 100.

[0075] Therefore, the length L4 of the front-side solder strip 131 overlapping on the second bus electrode 150 in the third direction is set between 2 / 3W2 and W2, which not only ensures the effective overlapping of the front-side solder strip 131 and the second bus electrode 150, but also reduces the manufacturing cost and weight, and is conducive to the lightweight design of the photovoltaic cell 100.

[0076] According to some embodiments of the present application, the first bus electrode 140 and the second bus electrode 150 are respectively located at the two ends of the cell body 110 in the third direction. That is, the first bus electrode 140 and the second bus electrode 150 are respectively located at the two sides of the cell body 110 in the width direction. In this way, the space between the solder strip 130 and the edge of the cell body 110 can be effectively utilized, the structure of the photovoltaic cell 100 is compact, and the miniaturization design is facilitated.

[0077] Further, the photovoltaic cell 100 further comprises a conductive connecting piece 210, one end of the conductive connecting piece 210 is connected with the front-side solder strip 131, and the other end of the conductive connecting piece 210 is adapted to be connected with the back-side solder strip 132 of the adjacent photovoltaic cell 100.

[0078] For example, in the example of Figure 8 and Figure 9 , the plurality of photovoltaic cells 100 can be arranged at intervals in the third direction, the conductive connecting piece 210 is located in the gap between the adjacent two photovoltaic cells 100, and one end of the conductive connecting piece 210 is electrically connected with the front-side solder strip 131 of one of the photovoltaic cells 100, and the other end of the conductive connecting piece 210 is electrically connected with the back-side solder strip 132 of the other photovoltaic cell 100.

[0079] Alternatively, the adjacent two photovoltaic cells 100 are partially stacked in the first direction, and the conductive connecting piece 210 is located between the adjacent two photovoltaic cells 100 in the first direction (not shown in the figure).

[0080] Therefore, the arrangement of the conductive connecting piece 210 can shorten the length of the front-side solder strip 131 while ensuring the photoelectric conversion efficiency of the photovoltaic cell 100, reduce the weight and cost of the photovoltaic cell 100, and facilitate the lightweight design of the photovoltaic cell 100.

[0081] Further, the thickness of the conductive connecting piece 210 in the first direction is D4, wherein D4 satisfies: 0.1mm≤D4≤0.4mm.

[0082] When D4<0.1mm, the thickness of the conductive connecting piece 210 is small, and the conductivity of the conductive connecting piece 210 can not meet the current demand of the photovoltaic cell 100, thereby affecting the overall conductivity of the photovoltaic cell 100; when D4>0.4mm, the thickness of the conductive connecting piece 210 is increased, which increases the manufacturing cost and weight, and is not conducive to the lightweight design of the photovoltaic cell 100. Therefore, the thickness D1 of the conductive connecting piece 210 is set to be between 0.1mm and 0.4mm, which not only ensures the electrical performance of the photovoltaic cell 100, but also controls the manufacturing cost of the photovoltaic cell 100.

[0083] According to some specific embodiments of the present application, the thickness of the second bus electrode 150 in the first direction is D5, wherein D1 and D5 respectively satisfy: 5um≤D1≤30um, 5um≤D5≤30um.

[0084] When D5<5um, the thickness of the second bus electrode 150 is small, and the conductivity of the second bus electrode 150 can not meet the current demand of the photovoltaic cell 100, thereby affecting the overall conductivity of the photovoltaic cell 100; when D5>30um, the thickness of the second bus electrode 150 is increased, which increases the manufacturing cost and weight, and is not conducive to the lightweight design of the photovoltaic cell 100. Therefore, the thickness D1 of the second bus electrode 150 is set to be between 5um and 30um, which not only ensures the electrical performance of the photovoltaic cell 100, but also controls the manufacturing cost of the photovoltaic cell 100.

[0085] According to some preferred embodiments of the present application, the thickness D5 of the second bus electrode 150 in the first direction satisfies: 5um≤D5≤20um. In this way, the electrical performance of the photovoltaic cell 100 is ensured, and the manufacturing cost of the photovoltaic cell 100 is controlled.

[0086] Further, the number of the front solder strips 131 and the back solder strips 132 is the same, the number of the front solder strips 131 is N, and the length of the cell body 110 in the second direction is L5, wherein the N and L2 satisfy: 0.5≤L5 / N≤2.

[0087] When L5 / N>2, the number of the grid lines 120 is less, so that the distance between two adjacent grid lines 120 is large, the path of the current generated by the cell body 110 to the grid line 120 is increased, which will cause a part of the electrical loss, and affect the photoelectric conversion efficiency of the photovoltaic cell 100; when L5 / N<0.5, the number of the grid lines 120 is more, although the photoelectric conversion efficiency of the photovoltaic cell 100 can be ensured, but the weight and cost of the photovoltaic cell 100 are also increased. Therefore, by controlling the ratio of the length L5 of the cell body 110 and the number N of the grid lines 120 to be between 0.5 and 2, the photoelectric conversion efficiency of the photovoltaic cell 100 can be ensured, and the weight and cost of the photovoltaic cell 100 can be reduced.

[0088] As shown in Figure 5 , Figure 8 and Figure 9 , the photovoltaic cell string 200 according to the second aspect embodiment of the present application comprises the photovoltaic cell 100 according to the first aspect embodiment of the present application.

[0089] According to the photovoltaic cell string 200 of the embodiment of the present application, by adopting the above-mentioned photovoltaic cell 100, the output power of the photovoltaic cell string 200 can be increased, and the weight and cost of the photovoltaic cell string 200 can be reduced, which is beneficial to the lightweight design of the photovoltaic cell string 200.

[0090] The photovoltaic module (not shown in the figure) according to the third aspect embodiment of the present application comprises the photovoltaic cell string 200 according to the second aspect embodiment of the present application.

[0091] According to the photovoltaic module of the embodiment of the present application, by adopting the above-mentioned photovoltaic cell string 200, the weight and cost of the photovoltaic module can be reduced, which is beneficial to the lightweight design of the photovoltaic module.

[0092] Other configurations and operations of the photovoltaic module according to the embodiment of the present application are known to those skilled in the art, and will not be described in detail here.

[0093] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0094] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the restriction of the utility model. In addition, the term "first", "second", "third" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0095] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication. For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model in the specific circumstances.

[0096] In the description of the specification, the description of the reference term "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example.

[0097] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and its equivalents.

Claims

1. A photovoltaic cell, characterized by, The battery piece body comprises: a plurality of grid lines, the plurality of grid lines being arranged on at least one surface of the battery piece body in a first direction, the plurality of grid lines being spaced apart in a second direction, and each of the grid lines extending in a third direction, the first direction, the second direction and the third direction being perpendicular to each other; a plurality of solder strips, the plurality of solder strips corresponding to the plurality of grid lines one by one, the plurality of solder strips being spaced apart in the second direction, and each of the solder strips extending in the third direction, and each of the solder strips being arranged on a side of the corresponding grid line away from the battery piece body; a first bus electrode, the first bus electrode being arranged on a side of the battery piece body in the first direction, and the first bus electrode being located between the grid lines and the solder strips. A width of the first bus electrode in the third direction is W1, and a minimum distance between the first bus electrode and an edge of the battery piece body in the third direction is H1, wherein the W1 and the H1 respectively satisfy: 1mm≤W1≤4mm, and 1mm≤H1≤2mm.

2. The photovoltaic cell of claim 1, wherein, A thickness of the first bus electrode in the first direction is D1, wherein the D1 satisfies: 5um≤D1≤30um.

3. The photovoltaic cell of claim 1, wherein, An outer diameter of each of the solder strips is greater than an outer diameter of each of the grid lines; 4. The photovoltaic cell of claim 1, wherein, An outer diameter of each of the solder strips is D2, and an outer diameter of each of the grid lines is D3, wherein the D2 and the D3 respectively satisfy: 0.05mm≤D2≤0.2mm, and 5um≤D3≤30um. A length of each of the solder strips in the third direction is less than a length of each of the grid lines in the third direction; 5. The photovoltaic cell of claim 1, wherein, In the third direction, a minimum distance between an end of each of the solder strips and an end of each of the grid lines is H2, wherein the H2 satisfies: 0.5mm≤H2≤1mm. The plurality of grid lines comprises a plurality of front grid lines and a plurality of back grid lines, and the plurality of front grid lines and the plurality of back grid lines are respectively arranged on two surfaces of the battery piece body in the first direction; 6. The photovoltaic cell of claim 3, wherein, The plurality of solder strips comprises a plurality of front solder strips and a plurality of back solder strips, the front solder strips being connected to the front grid lines, the back solder strips being connected to the back grid lines, and the first bus electrode being electrically connected to the plurality of back solder strips. In the third direction, an end of each of the front solder strips away from the first bus electrode protrudes out of the battery piece body, and a portion of each of the front solder strips protruding out of the battery piece body is adapted to be connected to the first bus electrode of an adjacent photovoltaic battery piece.

7. The photovoltaic cell of claim 6, wherein, In the third direction, a length of each of the front solder strips protruding out of the battery piece body is L1, wherein the L1 satisfies: 3mm≤L1≤7mm.

8. The photovoltaic cell of claim 7, wherein, In the third direction, a length of the back solder strip overlapping the first bus electrode is L2, and in the third direction, a length of each of the front solder strips overlapping the first bus electrode of the adjacent photovoltaic battery piece is L3, wherein the L2, L3 and W1 satisfy: 2 / 3W1≤L2≤W1, and 2 / 3W1≤L3≤W1.

9. The photovoltaic cell of claim 7, wherein, ​ 10. The photovoltaic cell of claim 9, wherein, An end of each of the front-side solder strips that extends out of the cell body in the third direction is located in the first busbar of an adjacent photovoltaic cell.

11. The photovoltaic cell of claim 6, wherein, Further comprising: A second busbar is provided on the other side of the cell body in the first direction, the second busbar being located between the front-side solder strips and the front-side grid lines.

12. The photovoltaic cell of claim 11, wherein, A length of the front-side solder strips that overlaps the second busbar in the third direction is L4, and a width of the second busbar in the third direction is W2, wherein the L4 and W2 satisfy 2 / 3W2≤L4≤W2.

13. The photovoltaic cell of claim 11, wherein, The first busbar and the second busbar are respectively located at two ends of the cell body in the third direction.

14. The photovoltaic cell of claim 13, wherein, Further comprising: A conductive connecting piece, one end of the conductive connecting piece being connected to the front-side solder strip, the other end of the conductive connecting piece being adapted to be connected to the back-side solder strip of an adjacent photovoltaic cell.

15. The photovoltaic cell of claim 14, wherein, A thickness of the conductive connecting piece in the first direction is D4, wherein the D4 satisfies 0.1mm≤D4≤0.4mm.

16. The photovoltaic cell of claim 13, wherein, A thickness of the second busbar in the first direction is D5, wherein the D1 and D5 respectively satisfy 5um≤D1≤30um and 5um≤D5≤30um.

17. The photovoltaic cell of claim 6, wherein, The number of the front-side solder strips is the same as the number of the back-side solder strips, the number of the front-side solder strips being N, and a length of the cell body in the second direction being L5, wherein the N and L5 satisfy 0.5≤L5 / N≤2.

18. A string of photovoltaic cells, characterized by, A photovoltaic cell string according to claim 18.

19. A photovoltaic module, characterized by A photovoltaic cell string according to claim 18.

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