Solar cell, cell assembly and photovoltaic system

Abstract

The utility model is suitable for the technical field of solar cells, and provides a solar cell, a cell module and a photovoltaic system. The battery pieces are arranged in the first direction, the fine grids are arranged on the battery pieces, the first fine grids and the second fine grids are alternately arranged in the second direction, at least part of the fine grids comprise fine grid sub-segments and fine grid gaps, at least part of the first fine grids comprise first fine grid sub-segments and first fine grid gaps, and the second fine grids comprise second fine grid sub-segments and second fine grid gaps. The first fine grid subsections and the first fine grid gaps are alternately arranged along the first direction; and / or at least part of the second fine grids comprise second fine grid sub-sections and second fine grid gaps, the second fine grid sub-sections and the second fine grid gaps are alternately arranged along the first direction, the plurality of welding strips are arranged on the battery piece and extend along the third direction, and the included angle between the first direction and the third direction is an acute angle. Therefore, the discontinuous arrangement of the fine grids can save the material of the fine grids and reduce the cost so as to ensure that the fine grid subsections can conduct the collected current out through the welding strip.

Description

Technical Field

[0001] This application belongs to the technical field of solar cells, and particularly relates to a solar cell, a battery module and a photovoltaic system. Background Art

[0002] At present, a solar cell is a semiconductor device that directly converts the energy of sunlight into electrical energy. The solar cell utilizes the photovoltaic effect to excite electrons by absorbing photons, and exports these electrons through a built-in electric field to generate current. At this time, the fine grid can collect and transmit the current, thereby realizing the conversion of light energy into electrical energy. However, in the related art, multiple fine grids need to be arranged on the solar cell, and stress concentration is likely to occur at the connection position between the fine grid and the solder strip, making the connection between the fine grid and the solder strip unstable. Therefore, it is necessary to increase the fine grid material and thus increase the size of the fine grid. In addition, the fine grid is prepared from silver paste / metallization process materials, resulting in an increase in cost. Summary of the Utility Model

[0003] This application provides a solar cell, a battery module and a photovoltaic system, aiming to solve the problems of solder strip detachment and excessive consumption of fine grid materials during the use of photovoltaic cells.

[0004] A solar cell provided by this application includes a battery string, a plurality of fine grids and a plurality of solder strips. The battery string includes a plurality of battery cells, and the plurality of battery cells are arranged in a first direction. The plurality of fine grids are arranged on the battery cells. The fine grids include a plurality of first fine grids and a plurality of second fine grids. The first fine grids and the second fine grids extend in the first direction. The first fine grids and the second fine grids have opposite polarities. The first fine grids and the second fine grids are alternately arranged in a second direction. At least part of the fine grids include fine grid sub-segments and fine grid gaps. At least part of the first fine grids include first fine grid sub-segments and first fine grid gaps. The first fine grid sub-segments and the first fine grid gaps are alternately arranged in the first direction; and / or at least part of the second fine grids include second fine grid sub-segments and second fine grid gaps. The second fine grid sub-segments and the second fine grid gaps are alternately arranged in the first direction. The plurality of solder strips are arranged on the battery cells. The solder strips extend in a third direction and are spaced apart in the second direction. The solder strips cover or partially cover the first fine grids and the second fine grids and are electrically connected to the first fine grids and the second fine grids. Wherein, the included angle between the first direction and the third direction is an acute angle.

[0005] In the solar cell according to the embodiment of the present application, the solar cell includes a battery string, a plurality of fine grids, and a plurality of solder tapes. The battery string includes a plurality of battery chips, and the plurality of battery chips are arranged in a first direction. The plurality of fine grids are arranged on the battery chips. The fine grids include a plurality of first fine grids and a plurality of second fine grids. The first fine grids and the second fine grids extend in the first direction, and the first fine grids and the second fine grids have opposite polarities. The first fine grids and the second fine grids are alternately arranged in a second direction. At least part of the fine grids include fine grid segments and fine grid gaps. At least part of the first fine grids include first fine grid segments and first fine grid gaps. The first fine grid segments and the first fine grid gaps are alternately arranged in the first direction; and / or at least part of the second fine grids include second fine grid segments and second fine grid gaps. The second fine grid segments and the second fine grid gaps are alternately arranged in the first direction. The plurality of solder tapes are arranged on the battery chips. The solder tapes extend in a third direction and are arranged at intervals in the second direction. The solder tapes cover or partially cover the first fine grids and the second fine grids and are electrically connected to the first fine grids and the second fine grids. Wherein, the included angle between the first direction and the third direction is an acute angle. In this way, the discontinuous setting of the fine grids can save the fine grid materials, reduce the cost, and the solder tapes can cover and connect all the fine grid segments to ensure that the fine grid segments can conduct the collected current through the solder tapes to form a loop. At the same time, by arranging the solder tapes and the fine grids at an acute angle, the connection force between the solder tapes and the fine grids can be increased to ensure stable connection.

[0006] Further, the battery chips include a first battery chip and a second battery chip. The first fine grids of the first battery chip and the second fine grids of the second battery chip are arranged in one-to-one correspondence. The solder tapes include a first solder tape and a second solder tape. The first solder tape connects the first fine grids of the first battery chip and the second fine grids of the second battery chip. The second solder tape connects the first fine grids of the second battery chip and the component to be connected.

[0007] Further, the component to be connected is the second fine grid or the bus bar of another adjacent first battery chip.

[0008] Further, the number of fine grid segments of each first fine grid or each second fine grid is 2-200.

[0009] Further, the length of the fine grid segment in the first direction is greater than a / 200 and less than 3a / 4, where a is the length of the battery chip in the first direction.

[0010] Further, the battery chip includes a middle region and four edge regions surrounding the middle region; in the first direction, the length of the fine grid segments in the edge regions of the battery chip is greater than the length of the fine grid segments in the middle region of the battery chip.

[0011] Further, the area of the thin grid segments located in the edge region is larger than the area of the thin grid segments in the middle region.

[0012] Further, the edge region includes a first edge region and a second edge region along the first direction, and the edge region further includes a third edge region and a fourth edge region along the second direction. The overlapping region of the first edge region with the third edge region and the fourth edge region is a first overlapping region, and the overlapping region of the second edge region with the third edge region and the fourth edge region is a second overlapping region;

[0013] The area of the thin grid segments located in the first overlapping region and the second overlapping region is larger than the area of the thin grid segments in the non-overlapping regions of the edge region.

[0014] Further, the area of the thin grid segments located in the first overlapping region and the second overlapping region is 1.1 - 10,000 times the area of the thin grid segments in the non-overlapping regions of the edge region.

[0015] Further, the length of the thin grid gap along the first direction is greater than 0 and less than a / 50.

[0016] Further, the first thin grid and / or the second thin grid in the first edge region and the second edge region are complete thin grids.

[0017] Further, the lengths of each of the thin grid segments in the first direction are equal or unequal;

[0018] The lengths of each of the thin grid gaps in the first direction are equal or unequal.

[0019] Further, the thin grid segments are dot-shaped, and the length of the thin grid gap in the first direction is greater than the length of the thin grid segment in the first direction.

[0020] Further, at least some of the thin grid segments are dot-shaped and / or at least some of the thin grid segments are line-shaped.

[0021] Further, the included angle α between the first direction and the third direction satisfies the following relationship: 0 < tanα ≤ P / L;

[0022] wherein, L is the total length of the battery string along the first direction, and P is the width of the solder ribbon along the second direction.

[0023] Further, in the second direction, the width of the solder ribbon is greater than or equal to the width of the thin grid; or

[0024] In the second direction, the width of the solder ribbon is smaller than the width of the fine grid.

[0025] The battery module provided by the embodiment of the present application includes the solar cell described in any one of the above embodiments.

[0026] The photovoltaic system provided by the embodiment of the present application includes the battery module described in the above embodiment.

[0027] In the solar cell, battery module, and photovoltaic system according to the embodiments of the present application, the solar cell includes a battery string, a plurality of fine grids, and a plurality of solder ribbons. The battery string includes a plurality of battery cells arranged in a first direction. The plurality of fine grids are arranged on the battery cells. The fine grids include a plurality of first fine grids and a plurality of second fine grids. The first fine grids and the second fine grids extend in the first direction. The first fine grids and the second fine grids have opposite polarities. The first fine grids and the second fine grids are alternately arranged in the second direction. At least part of the fine grids include fine grid segments and fine grid gaps. At least part of the first fine grids include first fine grid segments and first fine grid gaps. The first fine grid segments and the first fine grid gaps are alternately arranged in the first direction; and / or at least part of the second fine grids include second fine grid segments and second fine grid gaps. The second fine grid segments and the second fine grid gaps are alternately arranged in the first direction. The plurality of solder ribbons are arranged on the battery cells. The solder ribbons extend in a third direction and are spaced apart in the second direction. The solder ribbons cover or partially cover the first fine grids and the second fine grids and are electrically connected to the first fine grids and the second fine grids. Wherein, the included angle between the first direction and the third direction is an acute angle. In this way, the discontinuous arrangement of the fine grids can save the fine grid material, reduce the cost, and the solder ribbons can cover and connect all the fine grid segments to ensure that the collected current can be conducted out through the solder ribbons to form a loop. At the same time, by arranging the solder ribbons and the fine grids at an acute angle, the connection force between the solder ribbons and the fine grids can be increased to ensure stable connection. Description of the Drawings

[0028] Figure 1 is a partial plan structure diagram of a solar cell according to an embodiment of the present application;

[0029] Figure 2 is a partial plan structure diagram of a battery cell according to an embodiment of the present application;

[0030] Figure 3 is another partial plan structure diagram of a solar cell according to an embodiment of the present application;

[0031] Figure 4 is yet another partial plan structure diagram of a solar cell according to an embodiment of the present application;

[0032] Figure 5 is still another partial plan structure diagram of a solar cell according to an embodiment of the present application;

[0033] Figure 6 It is a schematic diagram of the module structure of a battery assembly according to an embodiment of the present application;

[0034] Figure 7 It is a schematic diagram of the structure of a photovoltaic system according to an embodiment of the present application.

[0035] Description of main component symbols:

[0036] Solar cell 100, cell 10, fine grid 11, first fine grid 111, second fine grid 112, fine grid segment 12, first fine grid segment 121, second fine grid segment 122, first doping layer 123, second doping layer 124, fine grid gap 13, first fine grid gap 131, second fine grid gap 132, intermediate region 14, edge region 15, first edge region 151, second edge region 152, third edge region 153, fourth edge region 154, first overlapping region 155, second overlapping region 156, first cell 101, second cell 102, solder ribbon 20, first solder ribbon 21, second solder ribbon 22, battery string 200, battery assembly 300, photovoltaic system 400. Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0039] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0040] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0042] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0043] In the related art, a solar cell is a semiconductor device that directly converts the energy of sunlight into electrical energy. The solar cell utilizes the photovoltaic effect, absorbs photons to excite electrons, and exports these electrons through a built-in electric field to generate an electric current. At this time, the fine grid can collect and transmit the current, thereby achieving the conversion of light energy into electrical energy. However, multiple fine grids need to be arranged on the solar cell, and stress concentration easily occurs at the connection position between the fine grid and the solder strip, making the connection between the fine grid and the solder strip unstable. Therefore, it is necessary to increase the fine grid material and thus increase the size of the fine grid. In addition, the fine grid is prepared from silver paste / metallization process materials, resulting in an increase in cost. In the embodiments of the present application, the intermittent arrangement of the fine grid can save the fine grid material, reduce the cost, and the solder strip can cover and connect all the fine grid sub-segments to ensure that the collected current can be conducted out through the solder strip by the fine grid sub-segments to form a loop. At the same time, by arranging the solder strip and the fine grid at an acute angle, the connection force between the solder strip and the fine grid can be increased to ensure stable connection.

[0044] Embodiment 1

[0045] Please refer to Figure 1 、 Figure 2 and Figure 3 , a solar cell 100 provided by the present application, the solar cell 100 includes a battery string 200, a plurality of fine grids 11 and a plurality of solder strips 20. The battery string 200 includes a plurality of battery cells 10, and the plurality of battery cells 10 are arranged along a first direction. The plurality of fine grids 11 are arranged on the battery cells 10. The fine grid 11 includes a plurality of first fine grids 111 and a plurality of second fine grids 112. The first fine grids 111 and the second fine grids 112 extend along the first direction, the polarities of the first fine grids 111 and the second fine grids 112 are opposite, the first fine grids 111 and the second fine grids 112 are alternately arranged along a second direction. At least part of the fine grid 11 includes a fine grid sub-segment 12 and a fine grid gap 13. At least part of the first fine grid 111 includes a first fine grid sub-segment 121 and a first fine grid gap 131. The first fine grid sub-segment 121 and the first fine grid gap 131 are alternately arranged along the first direction; and / or at least part of the second fine grid 112 includes a second fine grid sub-segment 122 and a second fine grid gap 132. The second fine grid sub-segment 122 and the second fine grid gap 132 are alternately arranged along the first direction. The plurality of solder strips 20 are arranged on the battery cells 10. The solder strips 20 extend along a third direction and are arranged at intervals along the second direction. The solder strips 20 cover or partially cover the first fine grids 111 and the second fine grids 112 and are electrically connected to the first fine grids 111 and the second fine grids 112. Wherein, the included angle between the first direction and the third direction is an acute angle.

[0046] In the solar cell 100 according to the embodiment of the present application, the solar cell 100 includes a battery string 200, a plurality of fine grids 11, and a plurality of solder tapes 20. The battery string 200 includes a plurality of battery chips 10. The plurality of battery chips 10 are arranged in a first direction. The plurality of fine grids 11 are arranged on the battery chips 10. The fine grids 11 include a plurality of first fine grids 111 and a plurality of second fine grids 112. The first fine grids 111 and the second fine grids 112 extend in the first direction. The first fine grids 111 and the second fine grids 112 have opposite polarities. The first fine grids 111 and the second fine grids 112 are alternately arranged in a second direction. At least part of the fine grids 11 include fine grid sub - segments 12 and fine grid gaps 13. At least part of the first fine grids 111 include first fine grid sub - segments 121 and first fine grid gaps 131. The first fine grid sub - segments 121 and the first fine grid gaps 131 are alternately arranged in the first direction; and / or at least part of the second fine grids 112 include second fine grid sub - segments 122 and second fine grid gaps 132. The second fine grid sub - segments 122 and the second fine grid gaps 132 are alternately arranged in the first direction. The plurality of solder tapes 20 are arranged on the battery chips 10. The solder tapes 20 extend in a third direction and are arranged at intervals in the second direction. The solder tapes 20 cover or partially cover the first fine grids 111 and the second fine grids 112 and are electrically connected to the first fine grids 111 and the second fine grids 112. Wherein, the included angle between the first direction and the third direction is an acute angle. In this way, the intermittent arrangement of the fine grids 11 can save the material of the fine grids 11, reduce the cost, and the solder tapes 20 can cover and connect all the fine grid sub - segments 12 to ensure that the fine grid sub - segments 12 can conduct the collected current out through the solder tapes 20 to form a loop. At the same time, by arranging the solder tapes 20 and the fine grids 11 to be inclined at an acute angle, the connection force between the solder tapes 20 and the fine grids 11 can be increased to ensure stable connection.

[0047] In the embodiment of the present application, the type of the solar cell 100 is not limited to meet different requirements. For example, in this embodiment, the solar cell 100 can be a back - contact cell. At this time, the front side of the battery chip 10 is used to receive light, and the back side of the battery chip 10 includes a plurality of alternately arranged first doping layers 123 and second doping layers 124. Both the first doping layers 123 and the second doping layers 124 extend along the first direction. In some embodiments, the first doping layers 123 and the second doping layers 124 are alternately arranged in the second direction. At the same time, the first fine grids 111 and the second fine grids 112 extend in the first direction. The first fine grids 111 and the second fine grids 112 have opposite polarities. The first fine grids 111 and the second fine grids 112 are alternately arranged in the second direction. The first fine grids 111 and the first doping layers 123 are electrically connected together, and the second fine grids 112 and the second doping layers 124 are electrically connected together.

[0048] In the embodiment of the present application, the back surface of the battery cell 10 can be without main grid lines, and the first fine grid line 111 and the second fine grid line 112 can directly achieve current convergence through the solder ribbon 20. The discontinuous design of the fine grid line 11 enables the fine grid line 11 to be segmented in a certain area. In this way, the solder ribbon 20 can electrically connect the adjacent fine grid sub-segments 12 in the first direction, ensuring that even at the place where the fine grid line 11 is disconnected, each fine grid sub-segment 12 can effectively conduct the collected current into the solder ribbon 20. This optimizes the material usage, reduces the production cost, and at the same time ensures the normal conduction of current and the overall performance of the component.

[0049] Specifically, the solder ribbon 20 can be arranged at an acute angle to the fine grid line 11 to increase the contact area between the solder ribbon 20 and the fine grid line 11, thereby increasing the electrical contact area between the solder ribbon 20 and the doping layer and improving the conduction efficiency from the doping layer to the solder ribbon 20. At the same time, the inclined arrangement of the solder ribbon 20 can relieve the problem of stress concentration to ensure the stable connection between the solder ribbon 20 and the battery cell 10 and improve the connection stability between the solder ribbon 20 and the battery cell 10.

[0050] It can be understood that the battery string 200 can include two battery cells 10 connected in series, or three battery cells 10 connected in series, or more battery cells 10. Specifically, the number of battery cells 10 to be connected in series can be determined according to the actual usage situation. In addition, in the embodiment of the present application, the size and type of the battery cell 10 are not limited either. The specifications and sizes of adjacent battery cells 10 can be the same or different to meet different requirements.

[0051] In the embodiment of the present application, the specific arrangement manner of adjacent battery cells 10 is not limited to meet different requirements. In one embodiment, at least part of the edges of two adjacent battery cells 10 are stacked together; in another embodiment, two adjacent battery cells 10 can be arranged at intervals. The distance between two adjacent battery cells 10 being within a suitable range can avoid the small operation space and large soldering difficulty caused by too small a distance, and can also avoid the waste of component space and increased cost caused by too large a distance.

[0052] In the embodiments of the present application, the doping types of the first doping layer 123 and the second doping layer 124 are not limited. For example, the first doping layer 123 is a P-type doping layer and the second doping layer 124 is an N-type doping layer; it can also be that the first doping layer 123 is an N-type doping layer and the second doping layer 124 is a P-type doping layer, as long as the polarities of the two are opposite to meet different requirements. In some embodiments, the first doping layer 123 can be a P-type polysilicon layer, a P-type amorphous silicon layer, a P-type microcrystalline silicon layer, or an N-type polysilicon layer, an N-type amorphous silicon layer, an N-type microcrystalline silicon layer, and specific details are not limited herein. Similarly, the second doping layer 124 can be a P-type polysilicon layer, a P-type amorphous silicon layer, a P-type microcrystalline silicon layer, or an N-type polysilicon layer, an N-type amorphous silicon layer, an N-type microcrystalline silicon layer, and specific details are not limited herein, as long as the polarities of the two are opposite. When the first doping layer 123 is a P-type doping layer and the second doping layer 124 is an N-type doping layer, the first fine grid 111 on the first doping layer 123 is a P-type fine grid 11, and the second fine grid 112 on the second doping layer 124 is an N-type fine grid 11.

[0053] In some embodiments, P-type doping refers to doping group III elements, including elements such as boron, aluminum, gallium, indium, thallium, etc.; N-type doping refers to doping group V elements, including elements such as nitrogen, phosphorus, arsenic, antimony, bismuth, etc., and specific details are not limited herein. Additionally, in some embodiments, the first doping layer 123 and the second doping layer 124 can also be of composite doping. For example, N-type doping also includes a small amount of P-type doping elements. Among them, the content of N-type doping elements in the second doping layer 124 is higher than 20% of the content of P-type doping elements to ensure the opposite polarity to the first doping layer 123.

[0054] Embodiment 2

[0055] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, the battery cell 10 includes a first battery cell 101 and a second battery cell 102. The first fine grids 111 of the first battery cell 101 and the second fine grids 112 of the second battery cell 102 are arranged in one-to-one correspondence. The welding strip 20 includes a first welding strip 21 and a second welding strip 22. The first welding strip 21 connects the first fine grid 111 of the first battery cell 101 and the second fine grid 112 of the second battery cell 102, and the second welding strip 22 connects the first fine grid 111 of the second battery cell 102 and a component to be connected (not shown in the figure).

[0056] In this way, the first fine grid 111 of the first solar cell 101 and the second fine grid 112 of the second solar cell 102 correspond to each other one by one along the same straight line; at the same time, the second fine grid 112 of the first solar cell 101 and the first fine grid 111 of the second solar cell 102 correspond to each other one by one along the same straight line, so that the first solder strip 21 can connect the first solar cell 101 and the second solar cell 102 in series. The second solder strip 22 can connect the first fine grid 111 of the second solar cell 102 and other components to be connected, and thus the series connection of multiple solar cells 10 can be realized to form a battery string 200.

[0057] Specifically, the first direction and the second direction can be the vertical direction. At this time, the solar cell 10 can be rectangular to maximize the utilization of the area of the solar cell 10. The solder strip 20 is arranged on at least two solar cells 10 in the third direction, and electrically connects the first fine grid 111 of the solar cell 10 and the second fine grid 112 of the adjacent solar cell 10. Among them, the first solder strip 21 connects the first fine grid 111 of the first solar cell 101 and the second fine grid 112 of the second solar cell 102, and the second solder strip 22 connects the first fine grid 111 of the second solar cell 102 and the second fine grid 112 of another first solar cell 101, and so on. The first solder strip 21 and the second solder strip 22 are alternately distributed in the second direction to connect the hetero-doped layers of adjacent solar cells 10 to form a battery string 200.

[0058] Furthermore, the included angle between the first direction and the third direction is an acute angle. By arranging the solder strip 20 to be inclined at an acute angle with respect to the doped layer, the contact area between the solder strip 20 and the solar cell 10 is significantly increased, thereby increasing the electrical contact area between the solder strip 20 and the doped layer and enhancing the conduction efficiency. At the same time, the inclined design of the solder strip 20 can effectively relieve the stress concentration problem, ensure the stability of the connection between the solder strip 20 and the solar cell 10, and reduce the connection failure caused by mechanical stress or temperature change. The firm connection between the solder strip 20 and the doped layer ensures the stable electrical connection between the solar cells 10 and improves the reliability and service life.

[0059] In the embodiment of the present application, actively arranging the solder strip 20 to be inclined at an acute angle with respect to the doped layer can reduce the process difficulty of the battery module 300, reduce the alignment requirements during the welding process, improve the welding error tolerance and accuracy, and reduce the manufacturing complexity. The inclined arrangement is easier to operate by automated equipment, improves production efficiency, reduces manual intervention, and reduces production costs. The design of the solder strip 20 with an acute angle inclination helps to disperse mechanical stress, reduce stress concentration at the welding point, and improve the reliability and durability of the welding point.

[0060] In addition, in the embodiments of the present application, the shape of the battery cell 10 is not limited to meet different requirements. For example, the battery cell 10 can be a rectangular or square whole battery cell 10. Then, the square whole battery cell 10 is designed to correspond to a single rectangular battery cell 10 or a single battery cell 10 segment (two segments, three segments, etc.) after cutting. The main feature of such a battery cell 10 is that there are no any fine grids 11 and electrode structures on the front side, and the positive and negative fine grids 11 are alternately distributed on the back side of the battery cell 10 in sequence. In addition, in the embodiments of the present application, the number of the first fine grid 111 and the second fine grid 112, the size ranges of each, and the spacing between adjacent fine grids 11 are not limited either, as long as the fine grids 11 can be covered by the welding tape 20 to meet different requirements.

[0061] Exemplarily, the first fine grid 111 can be the positive electrode, and the second fine grid 112 can be the negative electrode. Of course, in other embodiments, it can be the opposite, that is to say, the first fine grid 111 can be the negative electrode, and the second fine grid 112 can be the positive electrode, which is not specifically limited herein. The alternating distribution of the first fine grid 111 and the second fine grid 112 and their precise connection with the welding tape 20 enable the current to be collected and transmitted more effectively, reducing the electrical loss of the fine grids 11.

[0062] It can be understood that "first" and "second" in the first battery cell 101 and the second battery cell 102 are relative concepts, indicating that the two solar cells 100 are different. For example, in Figure 1 the example, the battery cell 10 marked on the left is the first battery cell 101, and the battery cell 10 on the right is the second battery cell 102.

[0063] In some alternative embodiments, the welding tape 20 is in a long strip shape, and the width of the welding tape 20 is less than the spacing between the first fine grid 111 and the second fine grid 112. In this way, when the welding tape 20 is disposed on the battery cell 10, the problem of short circuit caused by one welding tape 20 simultaneously straddling two fine grids 11 of a battery cell 10 is avoided.

[0064] Specifically, the width of the welding tape 20 is less than the spacing between the first fine grid 111 and the second fine grid 112, ensuring that when the welding tape 20 is arranged, it will not simultaneously straddle and connect two adjacent fine grids 11. By controlling the width of the welding tape 20, the situation that one welding tape 20 simultaneously straddles two fine grids 11 of a battery cell 10 is avoided, thereby preventing the short circuit problem.

[0065] Furthermore, in the process preparation of the battery string 200, the solder tape 20 can cover the fine grids 11 of multiple solar cells 10 on the same straight line along the third direction at one time, improving the welding efficiency, reducing the welding steps and time, and being suitable for large-scale production. The design that the solder tape 20 is attached to the fine grid 11 after being tilted at a certain angle facilitates the operation of automated equipment and improves the production precision and consistency. Then, the predetermined positions of different solar cells 10 are cut off by means of laser cutting or the like to form the battery string 200. In this way, the first doping layer 123 and the second doping layer 124 can conduct the current to the solder tape 20 through the first fine grid 111 and the second fine grid 112, so that the current can be further conducted to the bus bar through the solder tape 20.

[0066] In some embodiments, the distance between the first fine grid 111 and the second fine grid 112 is flexibly adjusted according to actual requirements. The first fine grid 111 and the second fine grid 112 can be set with equal spacing. The equal-spacing setting can ensure uniform current distribution and improve the overall efficiency of the battery module 300; the non-equal-spacing setting can optimize the current conduction path for specific application scenarios and reduce problems such as local overheating or excessive resistance. The combined setting of partial equal spacing and partial non-equal spacing can combine the advantages of both, be flexibly adjusted according to specific requirements, and optimize the performance of the battery module 300.

[0067] Furthermore, the center distance between two adjacent fine grids 11 is equal; the center distance between two adjacent fine grids 11 is equal to the center distance between two adjacent solder tapes 20. After the fine grids 11 are evenly distributed on the back surface of the solar cell 10, the solder tapes 20 can also be evenly distributed on the back surface of the solar cell 10, and the center distance between adjacent solder tapes 20 is equal to the center distance between adjacent fine grids 11, so that the solder tape 20 and the fine grid 11 can be accurately correspondingly arranged to ensure that each fine grid 11 can effectively connect to the solder tape 20.

[0068] In addition, in the embodiments of the present application, "equal center distance" means that "the distance between the structural centers of two adjacent structures is equal to the distance between the structural centers of another two adjacent structures". "Equality" in the process preparation can allow the error ratio to be between 0.9 and 1.1. That is to say, when the rated center distance is 1, the maximum error distance can be 1.1 times the rated distance, and the minimum error distance can be 0.9 times the rated distance.

[0069] Furthermore, multiple solder tapes 20 are arranged in parallel; the first fine grid 111, the second fine grid 112, the first doping layer 123, and the second doping layer 124 are all arranged in parallel. In this way, multiple solder tapes 20 are arranged in parallel on the back surface of the solar cell 10 and are evenly distributed along the direction perpendicular to the third direction, ensuring that the spacing between the solder tapes 20 is consistent and forming a regular layout. And it can make the solder tape 20 can be correspondingly arranged with the fine grid 11 or the doping layer.

[0070] Embodiment III

[0071] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, the component to be connected is the second fine grid 112 or the bus bar of another adjacent first cell 101.

[0072] In this way, the second cell 102 can be connected to another adjacent first cell 101 through the second solder tape 22, or the second cell 102 can be connected to an adjacent bus bar through the second solder tape 22, thereby forming a battery string 200.

[0073] Exemplarily, the component to be connected can be the second fine grid 112 of another adjacent first cell 101. During the process preparation, a solder tape 20 can be simultaneously disposed on the fine grids 11 of multiple cells 10 in the same straight line, and then can be disconnected at a predetermined position to ensure that the solder tape 20 can connect the first fine grid 111 and the second fine grid 112 of adjacent cells 10. For example, the first solder tape 21 can connect the first fine grid 111 of the first cell 10 and the second fine grid 112 of the second cell 10, and then disconnect at one end of the second fine grid 112 of the second cell 10 away from the first cell 10. Similarly, the second solder tape 22 can connect the first fine grid 111 of the second cell 10 and the second fine grid 112 of another first cell 10, and then disconnect at one end of the second fine grid 112 of the other first cell 10 away from the second cell 10. By analogy, a continuous battery string 200 can be formed.

[0074] In another example, the component to be connected can be a bus bar structure (not shown in the figure), and the bus bar structure can connect the solder tapes 20 of the same polarity to form a loop with the battery string 200 to conduct the current out. The second solder tape 22 located at the end of the battery string 200 can only connect the fine grid 11 on one cell 10 and extend relative to the cell 10 to connect the component to be connected such as the bus bar structure. In the embodiments of the present application, the form of the bus bar structure is not limited to meet different requirements. For example, the bus bar structure can be a conductive material such as a wire, a bus bar, a conductive tape, etc.

[0075] Embodiment IV

[0076] Please refer to Figure 1 and Figure 3 , in some alternative embodiments, the number of fine grid segments 12 of each first fine grid 111 or each second fine grid 112 is 2 - 200.

[0077] In this way, when the number of the fine grid segments 12 is set within this range, it can not only ensure the coherence of the fine grid 11 to make the connection of the solder tape 20 stable, but also save the material of the fine grid 11.

[0078] Exemplarily, the number of the fine grid sub - segments 12 of each first fine grid 111 or each second fine grid 112 can be 2, 5, 10, 20, 50, 100, 150, or 200. It can be understood that as the number of the fine grid sub - segments 12 increases, the length of the fine grid sub - segments 12 in the first direction gradually decreases. As the number of the fine grid sub - segments 12 decreases, the length of the fine grid sub - segments 12 in the first direction can increase.

[0079] Embodiment Five

[0080] Please refer to Figure 1 and Figure 3 , in some alternative embodiments, the length of the fine grid sub - segment 12 in the first direction is greater than a / 200 and less than 3a / 4, where a is the length of the cell 10 in the first direction.

[0081] In this way, the number of the fine grid sub - segments 12 can be multiple, and the length of the fine grid sub - segments 12 in the first direction can be set within this range, which can not only save materials but also ensure stable connection with the solder strip 20.

[0082] Exemplarily, when the length a of the cell 10 in the first direction is 210 mm, the length of the fine grid sub - segment 12 in the first direction is greater than 1.05 mm and less than 157.5 mm. In this way, setting the lengths of all the fine grid sub - segments 12 within this range can effectively conduct the current of the doped layer, ensure stable connection with the solder strip 20, and at the same time, setting the fine grid gap 13 can effectively reduce the material consumption.

[0083] Embodiment Six

[0084] Please refer to Figure 3 and Figure 4 , in some alternative embodiments, the cell 10 includes an intermediate region 14 and four edge regions 15 surrounding the intermediate region 14; in the first direction, the length of the fine grid sub - segment 12 located in the edge region 15 of the cell 10 is greater than the length of the fine grid sub - segment 12 located in the intermediate region 14 of the cell 10.

[0085] In this way, the length of the fine grid sub - segment 12 located at the edge of the cell 10 is longer, which is beneficial to the connection of the solder strip 20 and ensures the connection stability of the battery string 200.

[0086] Specifically, the length of the fine grid segment 12 located at the edge of the battery cell 10 is longer, so that the contact area between the welding tape 20 and the fine grid 11 is larger, effectively reducing the resistance at the connection and ensuring the reliability of current conduction. At the same time, the fine grid segment 12 in the middle position can be shorter, saving materials without affecting the overall electrical performance. Therefore, the optimized distribution of the lengths of the fine grid segments 12 at the edge and in the middle can ensure the efficient operation of the battery string 200.

[0087] Embodiment Seven

[0088] Please refer to Figure 3 and Figure 4 , in some alternative embodiments, the area of the fine grid segment 12 located in the edge region 15 is larger than the area of the fine grid segment 12 in the middle region 14.

[0089] In this way, the larger area of the fine grid segment 12 in the edge region 15 is beneficial to the connection of the welding tape 20 and ensures the connection stability of the battery string 200.

[0090] Specifically, the relatively large area of the fine grid segment 12 in the edge region 15 helps to improve the connection quality of the welding tape 20, thereby enhancing the overall connection stability of the battery string 200. The welding tape 20 can adhere more firmly at these positions, reducing the contact resistance and ensuring the efficient conduction of current. The area of the fine grid segment 12 in the middle region 14 is relatively small, which not only saves materials but also does not affect the overall function of the battery cell 10. Therefore, the reasonable distribution of the areas of the fine grid segments 12 in the edge region 15 and the middle region 14 improves the connection performance of the battery cell 10, saves fine grid materials, and does not affect the overall stability and durability of the battery string 200.

[0091] Embodiment Eight

[0092] Please refer to Figure 4 and Figure 5 , in some alternative embodiments, the edge region 15 includes a first edge region 151 and a second edge region 152 along a first direction, the edge region 15 further includes a third edge region 153 and a fourth edge region 154 along a second direction, the overlapping region of the first edge region 151 with the third edge region 153 and the fourth edge region 154 is a first overlapping region 155, and the overlapping region of the second edge region 152 with the third edge region 153 and the fourth edge region 154 is a second overlapping region 156;

[0093] The area of the fine grid segment 12 located in the first overlapping region 155 and the second overlapping region 156 is larger than the area of the fine grid segment 12 in the non-overlapping region of the edge region 15.

[0094] Thus, the area of the thin grid segment 12 located in the first overlapping region 155 and the second overlapping region 156 is larger than the area of the thin grid segment 12 in the non-overlapping region of the edge region 15. That is to say, the area of the thin grid segment 12 at the four corners of the cell 10 is larger and has better connection ability.

[0095] Specifically, the cell 10 is rectangular, which is convenient for large-scale production and arrangement, and improves space utilization. The area of the thin grid segment 12 located in the first overlapping region 155 and the second overlapping region 156 is larger than the area of the thin grid segment 12 in the non-overlapping region of the edge region 15. That is to say, the area of the thin grid segment 12 in the first overlapping region 155 and the second overlapping region 156 is larger, which helps to connect with the solder strip 20. The solder strip 20 can cover the thin grid 11 evenly, effectively preventing the disconnection between the solder strip 20 and the thin grid 11, and improving the reliability of the connection. In addition, the solder strip 20 is inclined with respect to the edge of the cell 10, flexibly adjusting the contact position between the solder strip 20 and the thin grid 11 to adapt to different types and sizes of cells 10. The inclined solder strip 20 can effectively disperse mechanical stress, reduce the solder joint damage caused by stress concentration, and extend the service life of the battery module 300.

[0096] Furthermore, the area of the thin grid segment 12 located in the first overlapping region 155 and the second overlapping region 156 is larger than the area of the thin grid segment 12 in the non-overlapping region of the edge region 15, and at the same time, the area of the thin grid segment 12 in the edge region 15 is larger than the thin grid segment 12 in the middle region 14. This not only enhances the connection ability of the solder strip 20 at these key positions, but also further improves the overall connection stability of the cell 10. The increase in the area of the thin grid segment 12 means that the solder strip 20 has a larger contact surface in the overlapping region, reducing the contact resistance and ensuring the efficiency and stability of current transmission. In contrast, the area of the thin grid segment 12 in the non-overlapping part of the edge region 15 is relatively small, saving materials without affecting the overall performance. Therefore, this area differential design strengthens the connection effect at the corners of the cell 10, providing guarantee for the long-term stable operation of the battery string 200.

[0097] Embodiment Nine

[0098] Please refer to Figure 4 and Figure 5 , in some alternative embodiments, the area of the thin grid segment 12 located in the first overlapping region 155 and the second overlapping region 156 is 1.1 - 10000 times the area of the thin grid segment 12 in the non-overlapping region of the edge region 15.

[0099] Thus, the thin grid segment 12 located in the first overlapping region 155 and the second overlapping region 156 can extend its length and width along the first direction and the second direction, thereby increasing its own area and ensuring stable connection with the solder strip 20.

[0100] Specifically, the overlapping regions at the four corners of the cell 10 have a larger contact area, making the attachment of the solder strip 20 more secure in these critical areas. The expanded area of the fine grid segments 12 effectively reduces the resistance at the connection points, enhances the efficiency of current conduction, and improves the reliability and durability of the entire cell string 200. Therefore, this area expansion not only optimizes the connection performance of the cell 10 in the overlapping regions but also provides a more robust connection point for the solder strip 20, ensuring stability and electrical performance during long-term use. This range of the fine grid gap 13 not only optimizes the use of materials but also enhances the overall electrical performance and efficiency of the cell 10, making it more efficient and stable in practical applications.

[0101] Furthermore, when multiple fine grid segments 12 are provided in the first overlapping region 155 and the second overlapping region 156, the area of the fine grid segment 12 closest to the edge of the cell 10 is the largest, and the area of the fine grid segment 12 closer to the middle region 14 is smaller.

[0102] Embodiment Ten

[0103] Please refer to Figures 3 to 5 , in some alternative embodiments, the length of the fine grid gap 13 in the first direction is greater than 0 and less than a / 50.

[0104] In this way, by setting the length of the fine grid gap 13 in the first direction within this range, the material of the fine grid 11 can be saved, and the distance between the fine grid segments 12 can be prevented from being too large, resulting in the current generated by the doped layer not being collected.

[0105] Exemplarily, when the length a of the cell 10 in the first direction is 210 mm, the length of the fine grid gap 13 in the first direction is greater than 0 and less than 4.2 mm. In this way, by setting the length of all the fine grid gaps 13 in the first direction within this range, the current export of the doped layer can be effectively ensured, and the situation where the current of the doped layer cannot be exported due to the too long fine grid gap 13 can be avoided.

[0106] Embodiment Eleven

[0107] Please refer to Figure 3 and Figure 4 , in some alternative embodiments, the first fine grid 111 and / or the second fine grid 112 in the first edge region 151 and the second edge region 152 are complete fine grids 11.

[0108] In this way, the first fine grid 111 and / or the second fine grid 112 provided in the first edge region 151 and the second edge region 152 can be complete fine grids 11 without fine grid gaps 13 to ensure the stability of the connection to the solder strip 20.

[0109] Specifically, please refer to Figure 3 and Figure 4 , the first fine grid 111 and the second fine grid 112 of the first edge region 151 and the second edge region 152 are complete fine grids 11, so that the fine grids 11 in the edge region 15 have a larger contact area, which helps to enhance the adhesion of the welding strip 20 in these key regions, reduce the connection resistance, and ensure the efficient conduction of current. Since there are no gaps in these complete fine grid 11 regions, more uniform contact pressure can be provided during the welding process, avoiding potential connection problems caused by the fine grid gaps 13. In this way, the overall stability of the battery cell 10 in terms of connection and current transmission is significantly improved.

[0110] Example Twelve

[0111] Please refer to Figure 3 and Figure 4 , in some alternative embodiments, the lengths of each fine grid sub-segment 12 in the first direction are equal or unequal;

[0112] The lengths of each fine grid gap 13 in the first direction are equal or unequal.

[0113] In this way, the lengths of different fine grid sub-segments 12 can enable the lengths of the fine grid sub-segments 12 and the fine grid gaps 13 in the first direction to be adjusted automatically. When the lengths of the fine grid sub-segments 12 and the fine grid gaps 13 in the first direction are equal, the manufacturing difficulty can be simplified.

[0114] Specifically, when the lengths of the fine grid sub-segments 12 and the fine grid gaps 13 in the first direction are equal, the production process can be simplified because this configuration helps to standardize the manufacturing process, reducing complex processing steps and adjustment requirements. Additionally, even if the lengths of the fine grid sub-segments 12 and the fine grid gaps 13 are unequal, this flexible design can effectively adapt to various battery cell 10 design schemes, improving the performance and material utilization efficiency of the battery cell 10 by optimizing the length distribution.

[0115] Example Thirteen

[0116] Please refer to Figure 3 and Figure 4 , in some alternative embodiments, the fine grid sub-segments 12 are in a dot shape, and the length of the fine grid gap 13 in the first direction is greater than the length of the fine grid sub-segments 12 in the first direction.

[0117] In this way, the fine grid sub-segments 12 are in a dot shape and can be evenly arranged on the battery cell 10, enabling the fine grid 11 to be prepared with less material and saving materials.

[0118] Specifically, please refer to Figure 3For the second cell 102, a part of the structure of the fine grid segment 12 is designed to be dot-shaped, and the length of the fine grid gap 13 in the first direction is greater than the length of the fine grid segment 12 in the first direction. In this way, the dot-shaped fine grid segments 12 can be evenly distributed on the cell 10, thereby reducing the use of the fine grid 11 material and achieving material savings.

[0119] Embodiment Fourteen

[0120] Please refer to Figure 3 and Figure 4 , in some alternative embodiments, at least part of the fine grid segments 12 are dot-shaped and / or at least part of the fine grid segments 12 are line-shaped.

[0121] In this way, the fine grid 11 can have both dot-shaped and line-shaped fine grid segments 12, simplifying the preparation process and saving materials.

[0122] Specifically, please combine Figure 3 with the second cell 102 in

[0123] Embodiment Fifteen

[0124] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, the included angle α between the first direction and the third direction satisfies the following relationship: 0 < tanα ≤ P / L;

[0125] where L is the total length of the battery string 200 in the first direction, and P is the width of the solder tape 20 in the second direction.

[0126] In this way, the tilt angle of the solder strip 20 can be obtained according to the length of the battery string 200. For battery strings 200 of different lengths and types, the angle can be adjusted so that a single solder strip 20 can completely cover the doping layers on the same straight line of multiple solar cells 10. This can facilitate the process preparation. After the solder strip 20 connects multiple solar cells 10 in series, laser selective shearing is then performed to form battery strings 200 in pairs. This method can effectively ensure the uniform coverage of the solder strip 20 in the entire battery string 200, and at the same time provides convenience for subsequent processing and assembly of the solar cells 10. By optimizing the angle and coverage method of the solder strip 20, the production efficiency can be improved, and the electrical performance and manufacturing quality of the solar cells 10 can be ensured.

[0127] Specifically, the tilt angle α of the solder strip 20 can be determined according to the total length L of the battery string 200. In this way, for battery strings 200 of different lengths and types, the angle can be adjusted so that a single solder strip 20 can completely cover the doping layers on the same straight line of multiple solar cells 10. This design not only improves the coverage efficiency of the solder strip 20, but also simplifies the process preparation process.

[0128] Furthermore, according to the length of the battery string 200 and the spacing width between the fine grids 11, the tilt angle of the solder strip 20 is flexibly adjusted to meet the specific requirements of different battery strings 200, ensuring that the solder strip 20 can completely cover the fine grids 11. Then, by accurately calculating the included angle α, the solder strip 20 can extend in a straight line when covering the doping layer, improving the welding efficiency and consistency. A single solder strip can completely cover the fine grids 11 of multiple solar cells 10 on the production line, simplifying the welding process, reducing the welding steps, and improving the production efficiency. After the solder strip 20 connects multiple solar cells 10 in series, laser selective shearing is performed to form battery strings 200 in pairs. This method is efficient and accurate, reducing the complexity in the production process.

[0129] Exemplarily, the battery string 200 can be composed of 9 solar cells 10 evenly distributed in the first direction, and L is the distance between the outermost ends of the 9 solar cells 10. According to this length and the width of the doping layer in the second direction, the inclination angle α is calculated so that the solder strip 20 can be inclined at an angle of α.

[0130] In the embodiment of the present application, the included angle range between the first direction and the third direction is not limited to meet different requirements. In this way, adjustments can be made according to the lengths of different battery strings 200 and the width of the doping layer in the second direction.

[0131] In the embodiments of the present application, there is no limitation on the center distance between two adjacent solder tapes 20 to meet different requirements. For example, the center distance between two adjacent solder tapes 20 can be greater than or equal to 100 μm, and preferably, the center distance between two adjacent solder tapes 20 can be 300 μm.

[0132] Example XVI

[0133] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, in the second direction, the width of the solder tape 20 is greater than or equal to the width of the fine grid 11; or

[0134] in the second direction, the width of the solder tape 20 is less than the width of the fine grid 11.

[0135] In this way, the width of the solder tape 20 can be larger than that of the fine grid 11 or smaller than that of the fine grid 11, and can be adjusted by itself to meet different requirements.

[0136] Specifically, when the width of the solder tape 20 is greater than or equal to the width of the fine grid 11, it can ensure that the solder tape 20 completely covers the width of the fine grid 11, providing a larger contact area, thereby enhancing the electrical connection between the solder tape 20 and the fine grid 11. This setting helps to improve the connection strength and stability of the solder tape 20 and ensure efficient current conduction. When the width of the solder tape 20 is less than the width of the fine grid 11, the width of the solder tape 20 is smaller, which can reduce the use of materials while still achieving effective current conduction. This flexible width adjustment ability enables the solder tape 20 to meet the design and manufacturing requirements of different solar cells 10. Whether the width of the solder tape 20 is selected to be greater or less than the width of the fine grid 11, it can optimize the production cost and process while ensuring electrical performance.

[0137] Example XVII

[0138] Please refer to Figure 6 , the battery module 300 provided by the embodiments of the present application includes the battery string 200 of the above embodiments.

[0139] In the solar cell 100 and the battery module 300 according to the embodiments of the present application, the solar cell 100 includes a battery string 200, a plurality of fine grids 11 and a plurality of solder tapes 20. The battery string 200 includes a plurality of battery chips 10. The plurality of battery chips 10 are arranged in a first direction. The plurality of fine grids 11 are arranged on the battery chips 10. The fine grids 11 include a plurality of first fine grids 111 and a plurality of second fine grids 112. The first fine grids 111 and the second fine grids 112 extend in the first direction. The first fine grids 111 and the second fine grids 112 have opposite polarities. The first fine grids 111 and the second fine grids 112 are alternately arranged in a second direction. At least part of the fine grids 11 include fine grid sub-segments 12 and fine grid gaps 13. At least part of the first fine grids 111 include first fine grid sub-segments 121 and first fine grid gaps 131. The first fine grid sub-segments 121 and the first fine grid gaps 131 are alternately arranged in the first direction; and / or at least part of the second fine grids 112 include second fine grid sub-segments 122 and second fine grid gaps 132. The second fine grid sub-segments 122 and the second fine grid gaps 132 are alternately arranged in the first direction. The plurality of solder tapes 20 are arranged on the battery chips 10. The solder tapes 20 extend in a third direction and are arranged at intervals in the second direction. The solder tapes 20 cover or partially cover the first fine grids 111 and the second fine grids 112 and are electrically connected to the first fine grids 111 and the second fine grids 112. Wherein, the included angle between the first direction and the third direction is an acute angle. In this way, the discontinuous arrangement of the fine grids 11 can save the materials of the fine grids 11, reduce the cost, and the solder tapes 20 can cover and connect all the fine grid sub-segments 12 to ensure that the fine grid sub-segments 12 can conduct the collected current out through the solder tapes 20 to form a loop. At the same time, by arranging the solder tapes 20 to be inclined at an acute angle with the fine grids 11, the connection force between the solder tapes 20 and the fine grids 11 can be increased to ensure stable connection.

[0140] It can be understood that in such an embodiment, the battery module 300 may further include a frame, a backsheet, a photovoltaic glass and an encapsulant film. The encapsulant film can be filled between the front and back surfaces of the battery chips 10, the photovoltaic glass, adjacent battery chips 10, etc. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulant film can be an EVA encapsulant film or a POE encapsulant film, which can be specifically selected according to actual situations and is not limited herein.

[0141] The photovoltaic glass can cover the encapsulant film on the front surface of the battery chips 10. The photovoltaic glass can be ultra-white glass, which has a high light transmittance, high transparency, and excellent physical, mechanical and optical properties. For example, the light transmittance of the ultra-white glass can reach more than 92%, and it can protect the battery chips 10 without affecting the efficiency of the battery chips 10 as much as possible. At the same time, the encapsulant film can bond the photovoltaic glass and the battery chips 10 together. The presence of the encapsulant film can seal and insulate the battery chips 10 and prevent water and moisture.

[0142] The backsheet can be attached to the adhesive film on the back of the solar cell 10. The backsheet can protect and support the solar cell 10, and has reliable insulation, water resistance and aging resistance. There are multiple choices for the backsheet, which can usually be tempered glass, plexiglass, aluminum alloy TPT composite film, etc., and its specific settings can be determined according to specific circumstances and are not limited here. The whole composed of the backsheet, the solar cell 10, the adhesive film and the photovoltaic glass can be arranged on the frame. The frame serves as the main external support structure of the entire battery module 300, and can stably support and install the battery module 300. For example, the battery module 300 can be installed at the required installation position through the frame.

[0143] Embodiment XVIII

[0144] Please refer to Figure 7 , the photovoltaic system 400 provided by the embodiment of the present application includes the battery module 300 of the above embodiment.

[0145] In the solar cell 100, the battery module 300 and the photovoltaic system 400 of the embodiment of the present application, the solar cell 100 includes a battery string 200, a plurality of fine grids 11 and a plurality of solder tapes 20. The battery string 200 includes a plurality of solar cells 10. The plurality of solar cells 10 are arranged in a first direction. A plurality of fine grids 11 are arranged on the solar cells 10. The fine grids 11 include a plurality of first fine grids 111 and a plurality of second fine grids 112. The first fine grids 111 and the second fine grids 112 extend in the first direction. The first fine grids 111 and the second fine grids 112 have opposite polarities. The first fine grids 111 and the second fine grids 112 are alternately arranged in a second direction. At least part of the fine grids 11 include fine grid segments 12 and fine grid gaps 13. At least part of the first fine grids 111 include first fine grid segments 121 and first fine grid gaps 131. The first fine grid segments 121 and the first fine grid gaps 131 are alternately arranged in the first direction; and / or at least part of the second fine grids 112 include second fine grid segments 122 and second fine grid gaps 132. The second fine grid segments 122 and the second fine grid gaps 132 are alternately arranged in the first direction. A plurality of solder tapes 20 are arranged on the solar cells 10. The solder tapes 20 extend in a third direction and are spaced apart in the second direction. The solder tapes 20 cover or partially cover the first fine grids 111 and the second fine grids 112, and are electrically connected to the first fine grids 111 and the second fine grids 112. Wherein, the included angle between the first direction and the third direction is an acute angle. In this way, the discontinuous arrangement of the fine grids 11 can save the material of the fine grids 11 and reduce the cost, and the solder tapes 20 can cover and connect all the fine grid segments 12 to ensure that the fine grid segments 12 can conduct the collected current out through the solder tapes 20 to form a loop. At the same time, by arranging the solder tapes 20 and the fine grids 11 at an acute angle, the connection force between the solder tapes 20 and the fine grids 11 can be increased to ensure stable connection.

[0146] In this embodiment, the photovoltaic system 400 can be applied in a photovoltaic power station, such as a ground power station, a rooftop power station, a water surface power station, etc., or can also be applied to devices or apparatuses that generate electricity using solar energy, such as a user solar power supply, a solar street lamp, a solar vehicle, a solar building, and so on. Of course, it can be understood that the application scenarios of the photovoltaic system 400 are not limited to this, that is to say, the photovoltaic system 400 can be applied in all fields that require solar power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system 400 can include a photovoltaic array, a busbar box, and an inverter. The photovoltaic array can be an array combination of multiple battery components 300. For example, multiple battery components 300 can form multiple photovoltaic arrays. The photovoltaic arrays are connected to the busbar box, and the busbar box can collect the current generated by the photovoltaic arrays. The collected current flows through the inverter and is converted into alternating current required by the mains power grid and then connected to the mains network to achieve solar power supply.

[0147] In the description of this specification, the descriptions with reference to the terms "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0148] In addition, the above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A solar cell, characterized in that, Comprising: A battery string, including a plurality of battery cells, and the plurality of battery cells are arranged along a first direction; A plurality of fine grids disposed on the battery cells, the fine grids including a plurality of first fine grids and a plurality of second fine grids, the first fine grids and the second fine grids extending along the first direction, the first fine grids and the second fine grids having opposite polarities, and the first fine grids and the second fine grids being alternately arranged along a second direction; At least part of the fine grids include fine grid sub-segments and fine grid gaps, at least part of the first fine grids include first fine grid sub-segments and first fine grid gaps, and the first fine grid sub-segments and the first fine grid gaps are alternately arranged along the first direction; and / or At least part of the second fine grids include second fine grid sub-segments and second fine grid gaps, and the second fine grid sub-segments and the second fine grid gaps are alternately arranged along the first direction; A plurality of solder tapes disposed on the battery cells, the solder tapes extending along a third direction and being spaced apart along the second direction, the solder tapes covering or partially covering the first fine grids and the second fine grids and being electrically connected to the first fine grids and the second fine grids; Wherein, the included angle between the first direction and the third direction is an acute angle.

2. The solar cell according to claim 1, characterized in that, The battery cells include a first battery cell and a second battery cell, the first fine grids of the first battery cell and the second fine grids of the second battery cell are arranged in one-to-one correspondence, the solder tapes include a first solder tape and a second solder tape, the first solder tape connects the first fine grids of the first battery cell and the second fine grids of the second battery cell, and the second solder tape connects the first fine grids of the second battery cell and a component to be connected.

3. The solar cell according to claim 2, characterized in that, The component to be connected is the second fine grid or a bus bar of another adjacent first battery cell.

4. The solar cell according to claim 1, characterized in that, The number of fine grid sub-segments of each first fine grid or each second fine grid is 2 - 200.

5. The solar cell according to claim 4, characterized in that, The length of the fine grid sub-segment along the first direction is greater than a / 200 and less than 3a / 4, where a is the length of the battery cell along the first direction.

6. The solar cell according to claim 5, characterized in that, The battery cell includes a middle region and four edge regions surrounding the middle region; In the first direction, the length of the fine grid sub-segments located in the edge region of the battery cell is greater than the length of the fine grid sub-segments located in the middle region of the battery cell.

7. The solar cell according to claim 6, characterized in that, The area of the fine grid sub-segments located in the edge region is greater than the area of the fine grid sub-segments located in the middle region.

8. The solar cell according to claim 7, characterized in that, The edge region includes a first edge region and a second edge region along the first direction, and the edge region further includes a third edge region and a fourth edge region along the second direction. The overlapping region of the first edge region with the third edge region and the fourth edge region is a first overlapping region, and the overlapping region of the second edge region with the third edge region and the fourth edge region is a second overlapping region; The area of the fine grid sub-segments located in the first overlapping region and the second overlapping region is greater than the area of the fine grid sub-segments located in the non-overlapping regions of the edge region.

9. The solar cell according to claim 8, characterized in that, The area of the thin grid segments located in the first overlapping region and the second overlapping region is 1.1 to 10,000 times the area of the thin grid segments in the non-overlapping region of the edge region.

10. The solar cell according to claim 5, characterized in that, The length of the thin grid gap in the first direction is greater than 0 and less than a / 50.

11. The solar cell according to claim 8, characterized in that, The first thin grid and / or the second thin grid in the first edge region and the second edge region are complete thin grids.

12. The solar cell according to claim 1, wherein, The lengths of each of the thin grid segments in the first direction are equal or unequal; The lengths of each of the thin grid gaps in the first direction are equal or unequal.

13. The solar cell according to claim 1, characterized in that, The thin grid segments are in dot shape, and the length of the thin grid gap in the first direction is greater than the length of the thin grid segment in the first direction.

14. The solar cell according to claim 13, wherein, At least part of the thin grid segments are in dot shape and / or at least part of the thin grid segments are in line segment shape.

15. The solar cell according to claim 1, characterized in that, The included angle α between the first direction and the third direction satisfies the following relationship: 0 < tanα ≤ P / L; wherein, L is the total length of the battery string in the first direction, and P is the width of the solder tape in the second direction.

16. The solar cell according to claim 1, characterized in that, In the second direction, the width of the solder tape is greater than or equal to the width of the thin grid; or In the second direction, the width of the solder tape is less than the width of the thin grid.

17. A battery component, characterized in that, Comprising a solar cell according to any one of claims 1-16.

18. A photovoltaic system, characterized in that, Comprising a battery module according to claim 17.

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