Solar cell and photovoltaic module

Abstract

The invention relates to the technical field of solar photovoltaic, in particular to a solar cell piece and a photovoltaic module, in the solar cell piece, a cell piece body comprises a first surface and a second surface which are opposite to each other; the plurality of isolation salient points are arranged on at least one of the first surface and the second surface of the battery piece body, the plurality of isolation salient points are arranged into a plurality of rows along the first direction, and each row of isolation salient points comprises a plurality of isolation salient points arranged along the second direction; wherein l is the larger one of the spacing between two adjacent isolation salient points along the first direction or the spacing between two adjacent isolation salient points along the second direction, h is the height of the isolation salient points, n is an integer of the ratio of the long side to the short side of the solar cell, and n is an integer of the ratio of the long side to the short side of the solar cell. L, h and n meet the relational expression: the arrangement of the # imgabs0 # isolation salient points can prevent the adjacent solar cells from scratching the light receiving surface of the cell body when a plurality of solar cells are stacked.

Description

Technical Field

[0001] The present invention relates to the field of solar photovoltaic technology, and in particular to a solar cell and a photovoltaic module. Background Art

[0002] In the production process of solar cells, after the production of solar cells is completed, multiple solar cells need to be stacked so that they can be transferred to subsequent equipment for the preparation of photovoltaic modules. When multiple solar cells are stacked, the electrodes of the solar cells will contact the light-receiving surface of the adjacent solar cells, which can easily cause scratches on the light-receiving surface of the solar cells, affecting the appearance and efficiency of the solar cells. Summary of the invention

[0003] In view of this, the present invention proposes a solar cell and a photovoltaic module, which can solve or partially solve the technical problem that when multiple solar cells are stacked, the electrodes of the solar cells will contact the light-receiving surfaces of adjacent solar cells, which may easily cause scratches on the light-receiving surfaces of the solar cells and affect the appearance and efficiency of the solar cells.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] In a first aspect, an embodiment of the present invention provides a solar cell, the solar cell comprising: a cell body, comprising a first surface and a second surface opposite to each other; a plurality of isolation bumps, provided on at least one of the first surface and the second surface of the cell body, the plurality of isolation bumps being arranged in a plurality of rows along a first direction, each row of the isolation bumps comprising a plurality of the isolation bumps arranged along a second direction; wherein l is the larger of a spacing between two adjacent isolation bumps along the first direction or a spacing between two adjacent isolation bumps along the second direction, h is the height of the isolation bump, and n is an integer ratio of a long side to a short side of the solar cell, and l, h, and n satisfy the relationship:

[0006] In some embodiments, n is 1, the solar cell is a whole cell, and l, h, and n satisfy the relationship:

[0007]

[0008] In some embodiments, n is 2, the solar cell is a half-cell, and l, h, and n satisfy the relationship:

[0009]

[0010] In some embodiments, l, h, and n satisfy the relationship:

[0011]

[0012] In some embodiments, the maximum size of the isolation bump on the projection of the battery cell body is d, wherein d<l.

[0013] In some embodiments, 0.05 mm ≤ d ≤ 2 mm.

[0014] In some embodiments, 3um≤h≤80um.

[0015] In some embodiments, n is 1, the solar cell is a whole cell, and l satisfies: 0.05mm<l≤18.7mm; or, n is 2, the solar cell is a half cell, and l satisfies: 0.05mm<l≤22.2mm; or, n is 3, the solar cell is a one-third cell, and l satisfies: 0.05mm<l≤24.6mm.

[0016] In some embodiments, the battery cell body has two oppositely disposed first edges and two oppositely disposed second edges, the first edges are perpendicular to the second edges, the first direction is parallel to the first edges, and the second direction is parallel to the second edges; or, the first direction, the second direction, and the first edges, the second edges are all disposed at acute angles.

[0017] In some embodiments, the solar cell further comprises a plurality of collector grid lines disposed on the second surface; a projection of at least one of the isolation bumps on the second surface has an overlapping area with the collector grid lines.

[0018] In some embodiments, the solar cell further comprises a plurality of collector grid lines arranged on the second surface; the plurality of collector grid lines comprise a first collector grid line and a second collector grid line arranged alternately in sequence along a direction perpendicular to the collector grid lines; a portion of the first collector grid lines located at at least one side edge of the cell body comprises a plurality of first sub-collector grid lines distributed at intervals, and a portion of the second collector grid lines comprises a plurality of second sub-collector grid lines distributed at intervals, and the first sub-collector grid lines and the second sub-collector grid lines are arranged alternately; a plurality of the first sub-collector grid lines arranged along a direction perpendicular to the collector grid lines are electrically connected together through a first terminal line, and a plurality of the second sub-collector grid lines arranged along a direction perpendicular to the collector grid lines are electrically connected together through a second terminal line.

[0019] In a second aspect, an embodiment of the present invention provides a photovoltaic module, the photovoltaic module includes a plurality of battery strings, the battery strings include a plurality of solar cells and a plurality of interconnecting components, the interconnecting components are used to connect the plurality of solar cells in series; wherein the solar cells are the solar cells as described above.

[0020] The present invention discloses a solar cell. The setting of isolation convex points can ensure that when a plurality of solar cells are stacked, a gap exists between the light-receiving surface of the cell body of one of two adjacent solar cells and the adjacent solar cell, thereby preventing the adjacent solar cell from scratching the light-receiving surface of the cell body and affecting the appearance and efficiency of the solar cell.

[0021] When l, h, and n satisfy the above relationship: When the height h and the distance l of the isolation bumps are set reasonably, it can effectively prevent the upper solar cell from bending and scratching the light-receiving surface of the lower solar cell when two solar cells are stacked, thereby avoiding affecting the appearance and efficiency of the solar cell; moreover, it can also avoid the increase in material cost and process difficulty of manufacturing the isolation bumps due to the smaller spacing of the isolation bumps, and avoid the poor isolation effect caused by the larger spacing of the isolation bumps; the solar cell has the advantages of good isolation effect, low material cost, low process difficulty, etc.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below.

[0024] Figure 1 It is a structural schematic diagram of a first arrangement method of isolation bumps in a solar cell according to an embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a second arrangement method of isolation bumps in a solar cell according to an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of a structure of a plurality of stacked solar cells according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic structural diagram of a solar cell body in a solar cell according to a first embodiment of the present invention;

[0028] Figure 5 It is a schematic structural diagram of a solar cell body in a solar cell according to a second embodiment of the present invention;

[0029] Figure 6It is a schematic structural diagram of a solar cell body in a solar cell according to a third embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the partial structure of the second surface of the solar cell according to the embodiment of the present invention;

[0031] Figure 8 Schematic diagram of the bending of stacked solar cells after being subjected to force.

[0032] Description of reference numerals:

[0033] 10. Battery cell body; 11. First side; 12. Second side; 13. First surface; 14. Second surface; 20. Isolation bump; 30. Collector grid line; 31. First collector grid line; 311. First sub-collector grid line; 32. Second collector grid line; 321. Second sub-collector grid line; 41. First terminal line; 42. Second terminal line; 50. Solder pad. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0035] In the related art, after the production of solar cells is completed, multiple solar cells need to be stacked and then transported. In order to avoid scratches between two adjacent stacked solar cells, which may cause scratches on the light-receiving surface of the solar cells and affect the appearance and efficiency of the solar cells, isolation bumps are usually set on the surface of the solar cells for isolation protection. If the spacing between the isolation bumps is set too small, for example, when two adjacent isolation bumps are close together, the material cost of the isolation bumps will increase. If the spacing between the isolation bumps is set too large, the isolation effect of the isolation bumps will be poor. Therefore, it is difficult to take into account both the isolation effect and the material cost of the isolation bumps when setting the isolation bumps. Figures 1 to 7 As shown, an embodiment of the present application provides a solar cell that can solve the above-mentioned technical problems.

[0036] The solar cell and photovoltaic module provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0037] Reference Figure 1 and Figure 2 As shown, the solar cell provided in the embodiment of the present application includes a cell body 10 and a plurality of isolation bumps 20 , and the isolation bumps 20 are disposed on at least one side of the cell body 10 .

[0038] In the present application, refer to Figure 3 As shown, along the thickness direction Z of the cell body 10, the cell body 10 includes a first surface 13 and a second surface 14 arranged opposite to each other, and the isolation bump 20 is arranged on the first surface 13 of the cell body 10. Alternatively, the isolation bump 20 is arranged on the second surface 14 of the cell body 10. Alternatively, the isolation bump 20 is arranged on the first surface 13 and the second surface 14 of the cell body 10. The arrangement of the isolation bump 20 can ensure that when multiple solar cells are stacked, there is a gap between the light-receiving surface of the cell body 10 of one of the two adjacent solar cells and the adjacent solar cell, so as to prevent the adjacent solar cell from scratching the light-receiving surface of the cell body 10, thereby affecting the appearance and efficiency of the solar cell.

[0039] In some embodiments, reference Figure 1 As shown, a plurality of isolation bumps 20 are arranged in a plurality of rows along a first direction X, and each row of isolation bumps 20 includes a plurality of isolation bumps 20 arranged along a second direction Y. When the plurality of isolation bumps 20 are designed, the relationship is satisfied: Wherein, l is the larger one of the spacing between two adjacent isolation bumps 20 along the first direction X or the spacing between two adjacent isolation bumps 20 along the second direction Y, h is the height of the isolation bump 20, n is the ratio of the long side to the short side of the solar cell, which is an integer. It should be noted that the ratio of the long side to the short side is an integer, which means that when the decimal part of the ratio is rounded off to an integer greater than or equal to 0.5, the rounding up method can be adopted; when it is less than 0.5, the rounding down method can be adopted, and N is the number of solar cells when stacked.

[0040] In the present application, refer to Figure 1 As shown, the spacing between two adjacent isolation bumps 20 along the first direction X is L2, and the spacing between two adjacent isolation bumps 20 along the second direction Y is L1. Comparing the sizes of L2 and L1, the larger one of L1 and L2 is the maximum spacing l between adjacent isolation bumps 20 along the first direction X or along the second direction Y.

[0041] It should be noted that, hereinafter, "the spacing l between two adjacent isolation bumps 20" refers to the larger spacing between two isolation bumps 20 adjacent to each other along the first direction X or the spacing between two isolation bumps 20 adjacent to each other along the second direction Y. The smaller spacing between the spacing between two isolation bumps 20 adjacent to each other along the first direction X or the spacing between two isolation bumps 20 adjacent to each other along the second direction Y can be set as needed, as long as it is smaller than the larger spacing between the spacing between two isolation bumps 20 adjacent to each other along the first direction X or the spacing between two isolation bumps 20 adjacent to each other along the second direction Y.

[0042] Reference Figure 3 As shown, when the light-receiving surface of the cell body 10 is a polished surface, along the thickness direction Z of the cell body 10, the distance between the end of the isolation bump 20 away from the cell body 10 and the interface where the isolation bump 20 contacts the cell body 10 is the height h of the isolation bump 20. When the light-receiving surface of the cell body 10 is a pyramid velvet surface, along the thickness direction Z of the cell body 10, the distance between the end of the isolation bump 20 away from the cell body 10 and the top of the pyramid in the interface where the isolation bump 20 contacts the cell body 10 is the height h of the isolation bump 20.

[0043] Reference Figure 4 As shown, in some examples, the battery cell body 10 has two oppositely disposed first sides 11 and two oppositely disposed second sides 12, the first sides 11 and the second sides 12 are perpendicular, the length of the first side 11 is a1, and the length of the second side 12 is b1. Comparing the length of the first side 11 and the length of the second side 12, if a1>b1, then n is an integer of a1 / b1; if a1 and b1 are equal or approximately equal, then n is 1.

[0044] When multiple solar cells are stacked, except for the top solar cell, the other solar cells will bend due to the pressure from other solar cells. Figure 8The higher the height of the isolation convex point 20 is, the more difficult it is for the collector grid line 30, the bus grid line, the pad 50, the terminal line, etc. of the upper solar cell in two adjacent solar cells to contact the light-receiving surface of the lower solar cell, and thus the upper solar cell is less likely to scratch the light-receiving surface of the lower solar cell; and the spacing between adjacent isolation convex points 20 will affect the bending degree of the solar cell. The larger the spacing between adjacent isolation convex points 20, the greater the bending degree of the solar cell, and the greater the bending degree, the easier it is to scratch the light-receiving surface of the adjacent solar cell; in addition, the weight of the solar cell will also affect the pressure it generates. When the weight of a whole solar cell is fixed, Under the condition, the more the number of slices of the whole solar cell is, the smaller the weight of the sliced ​​solar cell is, and the smaller the pressure generated is. It can be understood that n is an integer of the ratio of the long side to the short side of the solar cell. When n is 1, the solar cell is a whole cell without slices. When n is 2, the solar cell is divided into two slices. When n is 3, the solar cell is divided into three slices. And so on. It will not be repeated here. Since the weight change of the whole solar cell can be ignored, it is said that the weight of the solar cell can be characterized by the number of slices of the whole solar cell, that is, the ratio of the long side to the short side of the solar cell is an integer n. Based on the above, it can be seen that when designing the isolation bump 20, it is necessary to consider the height of the isolation bump 20, the spacing between two adjacent isolation bumps 20, the weight of the solar cell (that is, the ratio of the long side to the short side of the solar cell is an integer n), etc., so that the isolation bump 20 can better prevent the risk of scratching the light-receiving surface of the solar cell.

[0045] When designing the solar cell of the embodiment of the present application, l, h, and n are made to satisfy the relationship The height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 are both reasonably set, which can effectively prevent the solar cell from bending and scratching the light-receiving surface of the adjacent solar cell after being stressed when multiple solar cell cells are stacked, thereby avoiding affecting the appearance and efficiency of the solar cell cells; moreover, it can also avoid the increase in material cost and process difficulty of manufacturing the isolation bumps due to the smaller spacing l between two adjacent isolation bumps 20, and avoid the poor isolation effect due to the larger spacing l between two adjacent isolation bumps 20; the solar cell of the embodiment of the present application has the advantages of better isolation effect, low material cost, low process difficulty, etc.

[0046] In some embodiments, when N is 2, l, h, and n satisfy the relationship:

[0047] In the embodiment of the present application, the solar cells are naturally aligned by gravity during the stacking process, and the limit case of stacking multiple solar cells is two solar cells stacked, that is, N≥2. When N≥2, l, h, and n satisfy the above relationship, the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 are both set more reasonably, which can effectively prevent the upper solar cell from bending and scratching the light-receiving surface of the lower solar cell after being stressed when at least two solar cells are stacked.

[0048] It should be noted that when the solar cells are stacked and transported, they can be stacked and transported in the form of whole cells, or in the form of sliced ​​cells, such as two-slice, three-slice, four-slice, etc.

[0049] In some embodiments, when the solar cell is a back contact solar cell, the first surface 13 is the light-receiving surface of the solar cell, that is, the first surface 13 is the side of the solar cell that receives incident light. The second surface 14 is the backlight surface of the solar cell. The isolation bump 20 is disposed on at least one of the first surface 13 and the second surface 14.

[0050] In some embodiments, n is 1, that is, when the solar cell is a whole cell, l, h, and n satisfy the relationship:

[0051] In the embodiment of the present application, the solar cell sheets are stacked and transported as a whole cell. Figure 4 The length b1 of the second side 12 is shown as a1>b1, if a1 and b1 are equal or approximately equal, n is 1. When l and h satisfy the above relationship, the height h of the isolation bump 20 can be comprehensively considered to obtain an appropriate l, and the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 are both reasonably set, which can effectively prevent the solar cell from bending and scratching the light-receiving surface of the adjacent solar cell when two or more solar cells are stacked.

[0052] In some embodiments, n is 2, that is, when the solar cell is a half-cell, l and h satisfy the relationship:

[0053] In the embodiment of the present application, stacking and transporting half a solar cell is compared to stacking and transporting a whole solar cell. When the number of stacked solar cells is the same, for two adjacent solar cells, the gravity of the upper solar cell is smaller, and the deformation of the lower solar cell is relatively small. Therefore, when the height of the isolation bumps 20 is the same, the spacing l between two adjacent isolation bumps 20 in the half solar cell can be designed to be larger than the spacing l between two adjacent isolation bumps 20 in the whole solar cell.

[0054] When the solar cell of the embodiment of the present application is a half-cell cell, the stacking and transportation are performed according to Figure 5 As shown, the length a2 of the first side 11 and the length b2 of the second side 12, a2<b2, n is b2 / a2, and the integer n is 2, and the formula is satisfied at l and h. When the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 are configured, the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 can be comprehensively considered, so that the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 are reasonably configured, which can effectively prevent a half solar cell from bending and scratching the light-receiving surface of the adjacent half solar cell when two or more half solar cells are stacked.

[0055] In other embodiments, when n is 3, that is, when the solar cell is one-third of a cell, l and h satisfy the relationship:

[0056] In the embodiment of the present application, when stacking and transporting one-third of the solar cell panels, compared with the stacking and transporting of half a solar cell panel and the stacking and transporting of a whole solar cell panel, when the number of stacked solar cells is the same, the gravity of the solar cell panels on the upper layer is smaller, and the deformation of the solar cell panels on the lower layer is relatively smaller. Therefore, when the height of the isolation bumps 20 is the same, the spacing l between two adjacent isolation bumps 20 in one-third of the solar cell can be designed to be larger than the spacing l between two adjacent isolation bumps 20 in half a solar cell panel and the spacing l between two adjacent isolation bumps 20 in the whole solar cell panel.

[0057] When the solar cell of the embodiment of the present application is stacked and transported in a third of a cell, refer to Figure 6 As shown, comparing the length a3 of the first side 11 and the length b3 of the second side 12, a3<b3, n is b3 / a3, and n is an integer of 3, and l and h satisfy the relationship When the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 are configured, the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 can be comprehensively considered, so that the height h of the isolation bump 20 and the spacing l between two adjacent isolation bumps 20 are reasonably configured, which can effectively prevent the one-third solar cell from bending and scratching the light-receiving surface of the adjacent one-third solar cell when two or more one-third solar cells are stacked.

[0058] Based on the formula It can be seen that when multiple solar cells are stacked, the more the number of stacks is, the smaller the spacing l between two adjacent isolation bumps 20 needs to be set. When multiple solar cells are stacked, the number of stacked solar cells can be selected as needed. In some examples, the numerical range of N can be selected from 2≤N≤1000, for example, N can be one of 2, 3, 4, 10, 50, 10, 150, 200, 300, 400, 500, 600, 700, 800, 900, 1000, and multiple values ​​between the above values. When N>1000, the number of solar cells in the stack is too large, which will increase the pressure on the bottom solar cell, which may cause damage or even breakage; moreover, the total weight and total volume of the stacked solar cells are large, which increases the difficulty and risk of handling; the difficulty of aligning the solar cells increases.

[0059] In some embodiments, 2≤N≤200, so that the number of solar cells when stacked is more reasonable, which can meet the transportation requirements and reduce the risk of damage.

[0060] In some embodiments, when the number of stacked solar cells N is greater than or equal to 150, l, h, and n may be designed to satisfy the relationship:

[0061] In the embodiment of the present application, when the number of stacked solar cells N is greater than or equal to 150, the spacing l between two adjacent isolation bumps 20 is designed to be Within the range, when at least 150 solar cells are stacked, the solar cells can still be prevented from bending and scratching the light-receiving surfaces of the adjacent solar cells after being stressed, and the height h of the isolation bump 20 and the distance l between two adjacent isolation bumps 20 can be set more reasonably, avoiding the distance l between two adjacent isolation bumps 20 being set too large, resulting in poor isolation effect.

[0062] In some embodiments, n is 1, that is, when the solar cell is a whole cell, l, h, and n satisfy the relationship: In this way, the height h of the isolation bump 20 and the distance l between two adjacent isolation bumps 20 are both reasonably set, and the isolation bump 20 can prevent the light-receiving surface of the solar cell from being scratched.

[0063] In some embodiments, n is 2, that is, when the solar cell is a half cell, The effects within this range can be referred to above and will not be described here.

[0064] In other embodiments, when n is 3, that is, when the solar cell is one-third of a cell, l and h satisfy the relationship: The effects within this range can be referred to above and will not be described here.

[0065] In some embodiments, when N≥200, l, h, and n satisfy the relationship: In the embodiment of the present application, when N≥200, the number of stacked solar cells is large, and l, h, and n satisfy the above relationship, it is still possible to prevent the solar cell from bending and scratching the light-receiving surface of the adjacent solar cell after being stressed.

[0066] In some embodiments, n is 1, that is, when the solar cell is a whole cell, l and h satisfy the relationship: When n is 2, that is, the solar cell is a half-cell, l and h satisfy the relationship: When n is 3, that is, the solar cell is one-third of a cell, l and h satisfy the relationship: Through the above relationship, the height h of the isolation bump 20 and the distance l between two adjacent isolation bumps 20 can be set more reasonably. The isolation bump 20 can prevent the light-receiving surface of the solar cell from being scratched, and enable the solar cell to have the advantages of better isolation effect, low material cost, and low process difficulty.

[0067] In some embodiments, the maximum size of the projection of the isolation bump 20 on the battery cell body 10 is d, and d<1. In this way, it is possible to avoid connecting two adjacent isolation bumps 20 along the first direction X, and to avoid connecting two adjacent isolation bumps 20 along the second direction Y, thereby saving the material cost of the isolation bump 20 and reducing the process difficulty of manufacturing multiple isolation bumps 20.

[0068] In some embodiments, it is understood that the specific shape of the isolation bump 20 is set according to the use requirements, and the embodiments of the present application do not specifically limit this. For example, the projection of the isolation bump 20 on the battery cell body 10 is at least one of a circle and a polygon. When the projection of the isolation bump 20 on the battery cell body 10 is a circle, d refers to the diameter. The isolation bump 20 can be a regular hemispherical dot, or it can be an irregular bump. Of course, the surface of the isolation bump 20 away from the battery cell body 10 can also have a depression.

[0069] Considering that the maximum size of the projection of the isolation bump 20 on the cell body 10 is too small, it is difficult to make the isolation bump, and the maximum size of the projection of the isolation bump 20 on the cell body 10 is too large, which will affect the solar cell's absorption of light. Therefore, in some embodiments, 0.05mm≤d≤2mm.

[0070] When d<l, and d is in the above range, when designing the isolation bump 20, l can be greater than 2mm, l can also be greater than 0.05mm, and l can also be greater than any value between 0.05mm and 2mm. When l is greater than 2mm, the lower limit of l is relatively high. On the basis of ensuring scratch protection, the number of isolation bumps 20 can be reduced, and the material cost and process cost of isolation bumps 20 can be reduced; when l is greater than 0.05mm, the lower limit of l is relatively small, and l can take a smaller value, which increases the range of l that can be selected, and the number of isolation bumps 20 can also be set to be more, thereby increasing the isolation protection effect and avoiding scratches on the light-receiving surface of the solar cell.

[0071] It can be understood that d can be set according to usage requirements, and the embodiments of the present application do not specifically limit this. For example, d is one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.7mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, and multiple values ​​between the above values.

[0072] In some embodiments, the height h of the isolation bump 20 satisfies 3um≤h≤80um. In the embodiment of the present application, when the height h of the isolation bump 20 is within the above range, the height h of the isolation bump 20 is relatively reasonable and can effectively block multiple solar cells when they are stacked.

[0073] It can be understood that the height h of the isolation bump 20 can be set according to usage requirements, and the embodiment of the present application does not specifically limit this. For example, h is one of 3um, 3.5um, 4um, 4.5um, 5um, 5.5um, 6um, 6.5um, 7um, 7.5um, 8um, and multiple values ​​between the above values.

[0074] When h is less than 3um, the height h of the isolation bump 20 is too small. The isolation bump 20 is too small to effectively block the collector grid line 30, the bus grid line, the terminal line, the pad 50, etc. from contacting the light-receiving surface of the solar cell, and may not have an anti-scratch effect, or the anti-scratch effect is poor; when h is greater than 80um, the height h of the isolation bump 20 is too high, and the processing is difficult and the cost is high.

[0075] In some embodiments, when n is 1 and the solar cell is a whole cell, l satisfies: 0.05mm<l≤18.7mm. Alternatively, when n is 2 and the solar cell is a half cell, l satisfies: 0.05mm<l≤22.2mm. Alternatively, when n is 3 and the solar cell is a third cell, l satisfies: 0.05mm<l≤24.6mm.

[0076] For a whole cell, a half cell, and a third cell, the weights of the three decrease in sequence. When the number of stacked solar cells is the same, the deformation of the solar cells in the lower layer of the three will also decrease in sequence. Therefore, when the height of the isolation bumps 20 is the same, the range of the spacing l between two adjacent isolation bumps 20 in a third solar cell can be set wider than the range of the spacing l between two adjacent isolation bumps 20 in a half cell, and the range of the spacing l between two adjacent isolation bumps 20 in a half cell can be set wider than the range of the spacing l between two adjacent isolation bumps 20 in a whole cell. In this way, an appropriate l can be designed according to the whole cell, the half cell, and the third cell, so that the solar cell has the advantages of good isolation effect, low material cost, low process difficulty, etc.

[0077] In some embodiments, the solar cell further comprises a plurality of collector grid lines 30 disposed on the second surface 14; the projection of at least one isolation bump 20 on the second surface 14 has an overlapping area with the collector grid line 30. In this way, when a plurality of solar cells are stacked, it is easy for at least one isolation bump 20 on one solar cell to contact the collector grid line 30 on another solar cell, which can effectively prevent the collector grid line, bus grid line, solder pad, terminal line, etc. from scratching the surface of the cell body 10.

[0078] In some other embodiments, the projection of the isolation bump 20 on the second surface 14 has no overlapping area with the collector grid line 30 .

[0079] In some embodiments, the plurality of collector grid lines 30 include first collector grid lines 31 and second collector grid lines 32 arranged alternately in sequence along a direction perpendicular to the collector grid lines 30; a portion of the first collector grid lines 31 located at at least one side edge of the battery cell body 10 includes a plurality of first subset collector grid lines 311 distributed at intervals, and a portion of the second collector grid lines 32 includes a plurality of second subset collector grid lines 321 distributed at intervals, and the first subset collector grid lines 311 and the second subset collector grid lines 321 are arranged alternately; the plurality of first subset collector grid lines 311 arranged along a direction perpendicular to the collector grid lines 30 are electrically connected together through a first terminal line 41, and the plurality of second subset collector grid lines 321 arranged along a direction perpendicular to the collector grid lines 30 are electrically connected together through a second terminal line 42.

[0080] In the embodiment of the present application, a plurality of first subset grid lines 311 are electrically connected together through the first terminal line 41, so that the interconnection piece is electrically connected to the first terminal line 41 to achieve electrical connection with the plurality of first subset grid lines 311, and then the interconnection piece can be set at a certain distance from the edge of the battery cell body 10 to prevent the interconnection piece from being electrically connected to the first grid line 31 located at the edge and causing damage to the edge of the battery cell body 10. A plurality of second subset grid lines 321 are electrically connected together through the second terminal line 42, so that the interconnection piece is electrically connected to the second terminal line 42 to achieve electrical connection with the plurality of second subset grid lines 321, and then the interconnection piece can be set at a certain distance from the edge of the battery cell body 10 to prevent the interconnection piece from being electrically connected to the second grid line 32 and causing damage to the edge of the battery cell body 10.

[0081] In some embodiments, the battery cell body 10 has two oppositely disposed first sides 11 and two oppositely disposed second sides 12, the first sides 11 and the second sides 12 are perpendicular, the first direction X is parallel to the first sides 11, and the second direction Y is parallel to the second sides 12; or, the first direction X, the second direction Y, the first sides 11, and the second sides 12 are all arranged at acute angles. In this way, the arrangement of the isolation bumps 20 is more regular, and compared with the random distribution of the isolation bumps 20, the surface of the battery cell body 10 can be better fully protected. The extension direction of the isolation bumps 20 intersects with the first side 11 and the included angle is an acute angle.

[0082] In other embodiments, referring to Figure 2 As shown, the second direction Y is parallel to the first side 11 , that is, the extension direction of each row of isolation bumps 20 is parallel to the first side 11 .

[0083] Several specific embodiments are provided below:

[0084] In some embodiments, the height h of the isolation bump 20 is 56 μm, and l, h, and n satisfy the relationship: under the circumstances.

[0085] The solar cell is a whole cell, that is, n is 1. When N is 200, the spacing l between two adjacent isolation bumps 20 satisfies, l<5.4mm, and when N is 2, the spacing l between two adjacent isolation bumps 20 satisfies, l<17.1mm. Therefore, in the case where the solar cell is a whole cell and the number of stacked solar cells is greater than or equal to 200, in order to avoid the solar cell bending and scratching the light-receiving surface of the adjacent solar cell after being stressed, it is necessary to select a smaller l, and the spacing between two adjacent isolation bumps 20 along the first direction X and along the second direction Y should both satisfy less than 5.4mm.

[0086] When the solar cell is a half-cell cell, that is, n is 2, when N is 200, the spacing l between two adjacent isolation bumps 20 satisfies, l<6.4mm, and when N is 2, the spacing l between two adjacent isolation bumps 20 satisfies, l<20.4mm. Therefore, in the case where the solar cell is a half-cell cell and the number of stacked solar cells is greater than or equal to 200, it is necessary to select a smaller l, and the spacing between two adjacent isolation bumps 20 along the first direction X and along the second direction Y should both satisfy less than 6.4mm.

[0087] Therefore, the distance between two adjacent isolation bumps 20 along the first direction X and along the second direction Y decreases as the number of stacked solar cells increases.

[0088] An embodiment of the present application also provides a photovoltaic module, which includes multiple battery strings, each battery string includes multiple solar cells and multiple interconnecting components, and the interconnecting components are used to connect the multiple solar cells in series; wherein the solar cells are the solar cells described above.

[0089] The interconnection member may be, for example, a welding strip, a metal wire, a conductive tape or other components.

[0090] The photovoltaic module of the embodiment of the present application uses the above-mentioned solar cell. Since the solar cell is beautiful and efficient, has the advantages of good isolation effect, low material cost and low process difficulty, the photovoltaic module has the advantages of stable performance and low cost.

[0091] It should be noted that the photovoltaic assembly of the embodiment of the present application may include the solar cell in any of the above embodiments. The specific structure of the solar cell can be found in the above content, and the embodiment of the present application will not be repeated here.

[0092] In some embodiments, the photovoltaic module further includes a cover plate, a back plate and an adhesive film; wherein the solar cell is encapsulated between the cover plate and the back plate by the adhesive film.

[0093] In a specific embodiment, the cover plate is arranged on the front side of the photovoltaic module, and the cover plate plays the role of protecting the solar cell from the external environment. For example, the cover plate can be made of high-strength glass, which has good light transmittance, weather resistance and mechanical strength. The cover plate can effectively block the direct impact and damage of dust, rain, hail, etc. on the solar cell, while allowing sunlight to penetrate to maximize the photovoltaic conversion efficiency.

[0094] The backsheet is set on the back of the photovoltaic module, and mainly plays the role of insulation, waterproof, moisture-proof, UV resistance and mechanical strength. For example, the backsheet is usually composed of multiple layers of materials, including polyimide (PI), polyester (PET) or polypropylene (PP), etc. These materials have good chemical stability and thermal stability. The main function of the backsheet is to protect the photovoltaic module from environmental factors such as moisture, oxygen, ultraviolet rays and other harmful substances, while providing the necessary electrical isolation to prevent current leakage.

[0095] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0096] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the device, electronic device, computer-readable storage medium and computer program products containing instructions, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A solar cell, characterized in that: include: A battery cell body (10) comprising a first surface (13) and a second surface (14) opposite to each other; A plurality of isolation bumps (20) are provided on at least one of the first surface (13) and the second surface (14) of the battery cell body (10), the plurality of isolation bumps (20) are arranged in a plurality of rows along a first direction (X), and each row of the isolation bumps (20) includes a plurality of the isolation bumps (20) arranged along a second direction (Y); Wherein, l is the larger of the spacing between two adjacent isolation bumps (20) along the first direction (X) or the spacing between two adjacent isolation bumps (20) along the second direction (Y), h is the height of the isolation bump (20), and n is the ratio of the long side to the short side of the solar cell sheet, taking an integer, and l, h, and n satisfy the relationship:

2. The solar cell according to claim 1, characterized in that: n is 1, the solar cell is a whole cell, l, h, n satisfy the relationship:

3. The solar cell according to claim 1, characterized in that: n is 2, the solar cell is a half-cell, and l, h, and n satisfy the relationship:

4. The solar cell according to claim 1, characterized in that: l, h, n satisfy the relationship:

5. The solar cell according to any one of claims 1 to 4, characterized in that: The maximum size of the isolation bump (20) on the projection of the battery cell body (10) is d, wherein d<1.

6. The solar cell according to claim 5, characterized in that: 0.05mm≤d≤2mm.

7. The solar cell according to any one of claims 1 to 4, characterized in that: 3um≤h≤80um.

8. The solar cell according to any one of claims 1 to 4, characterized in that: n is 1, the solar cell is a whole cell, and l satisfies: 0.05mm<l≤18.7mm; Alternatively, n is 2, the solar cell is a half-cell, and l satisfies: 0.05 mm < l ≤ 22.2 mm; or, n is 3, the solar cell is a one-third-cell, and l satisfies: 0.05 mm < l ≤ 24.6 mm.

9. The solar cell according to any one of claims 1 to 4, characterized in that: The battery cell body (10) has two first sides (11) and two second sides (12) arranged opposite to each other, the first sides (11) and the second sides (12) are perpendicular to each other, the first direction (X) is parallel to the first sides (11), and the second direction (Y) is parallel to the second sides (12); Alternatively, the first direction (X), the second direction (Y), the first side (11), and the second side (12) are all arranged at acute angles.

10. The solar cell according to any one of claims 1 to 4, characterized in that: The solar cell sheet further comprises a plurality of collector grid lines (30) arranged on the second surface (14); A projection of at least one of the isolation bumps (21) on the second surface (14) has an overlapping area with the collector grid line (3).

11. The solar cell according to any one of claims 1 to 4, characterized in that: The solar cell sheet further comprises a plurality of collector grid lines (30) arranged on the second surface (14); The plurality of collector grid lines (30) include first collector grid lines (31) and second collector grid lines (32) which are alternately arranged in sequence along a direction perpendicular to the collector grid lines (3); A portion of the first collector grid lines (31) located at at least one side edge of the battery cell body (10) comprises a plurality of first sub-collector grid lines (311) distributed at intervals, and a portion of the second collector grid lines (32) comprises a plurality of second sub-collector grid lines (321) distributed at intervals, the first sub-collector grid lines (311) and the second sub-collector grid lines (321) being arranged in an alternating manner; a plurality of the first sub-collector grid lines (311) arranged in a direction perpendicular to the collector grid lines (30) are electrically connected together via a first terminal line (41), and a plurality of the second sub-collector grid lines (321) arranged in a direction perpendicular to the collector grid lines (30) are electrically connected together via a second terminal line (42).

12. A photovoltaic module, characterized in that: The battery string comprises a plurality of solar cells and a plurality of interconnectors, wherein the interconnectors are used to connect the plurality of solar cells in series; Wherein, the solar cell is the solar cell according to any one of claims 1-11.

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