Photovoltaic cell piece, photovoltaic cell string and photovoltaic module

Abstract

The utility model discloses a photovoltaic cell piece, a photovoltaic cell string and a photovoltaic assembly, the photovoltaic cell piece comprises a cell piece body and a plurality of electric conductors, the plurality of electric conductors are arranged on one side surface of the cell piece body in a first direction, the plurality of electric conductors are spaced along a second direction, each electric conductor extends along a third direction, the first direction, the second direction and the third direction are mutually orthogonal; wherein the plurality of electric conductors comprise a plurality of positive electric conductors and a plurality of negative electric conductors, the plurality of positive electric conductors and the plurality of negative electric conductors are staggered and spaced along a second direction, and the width of each negative electric conductor in the second direction is smaller than that of each positive electric conductor. Compared with a traditional solar cell piece, the photovoltaic cell piece provided by the utility model has the advantages that the consumption of silver paste is reduced, so that the cost of the photovoltaic cell piece is reduced, the output power of the photovoltaic cell piece is improved, and the electrical performance and reliability of the photovoltaic cell piece are improved.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, and in particular to a photovoltaic cell, a photovoltaic cell string, and a photovoltaic module. Background Technology

[0002] In related technologies, solar cells typically consist of a main grid and a sub-grid. Printing the main grid and sub-grid requires a large amount of silver paste, resulting in high costs. Multiple solar cells are connected into solar cell strings using solder ribbons. The solder ribbons are soldered to the solar cells using conventional soldering processes. However, on the one hand, conventional soldering processes are prone to causing solar cell warping due to their high soldering temperatures, and there is a high risk of cell cracking and merging during lamination. On the other hand, conventional soldering processes require printing insulating adhesive and solder paste, which is complex and leads to low production efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a photovoltaic cell that reduces silver paste consumption, thereby reducing the cost of the photovoltaic cell, and increases the output power of the photovoltaic cell, thereby improving the electrical performance and reliability of the photovoltaic cell.

[0004] Another objective of this invention is to propose a photovoltaic cell string comprising the aforementioned photovoltaic cells.

[0005] Another objective of this invention is to provide a photovoltaic module comprising the aforementioned photovoltaic cell string.

[0006] A photovoltaic cell according to a first aspect of the present invention includes: a cell body; a plurality of conductors, wherein the plurality of conductors are disposed on one side surface of the cell body in a first direction, the plurality of conductors are spaced apart along a second direction, and each conductor extends along a third direction, wherein the first direction, the second direction, and the third direction are orthogonal to each other; wherein the plurality of conductors includes a plurality of positive conductors and a plurality of negative conductors, the plurality of positive conductors and the plurality of negative conductors are alternately spaced along the second direction, and the width of each negative conductor in the second direction is less than or equal to the width of each positive conductor.

[0007] According to the embodiments of the present invention, the photovoltaic cell has a positive electrode conductor and a negative electrode conductor on the back of the cell body, and the width of each negative electrode conductor is smaller than the width of each positive electrode conductor. Compared with traditional solar cells, this saves silver paste consumption, reduces the cost of the photovoltaic cell, and increases the output power of the photovoltaic cell, thereby improving the electrical performance and reliability of the photovoltaic cell.

[0008] According to some embodiments of the present invention, the width of each negative electrode conductor in the second direction is W1, and the width of each positive electrode conductor is W2, wherein W1 and W2 satisfy: 1≤W2 / W1≤2.

[0009] According to some embodiments of the present invention, W1 and W2 further satisfy: 0.2mm≤W2≤1.4mm, 0.2mm≤W1≤0.7mm.

[0010] According to some embodiments of the present invention, the thickness of each positive electrode conductor in the first direction is D1, and the thickness of each negative electrode conductor is D2, wherein D1 and D2 respectively satisfy: 50nm≤D1≤150nm, 50nm≤D2≤150nm.

[0011] According to some embodiments of the present invention, there is an insulator of a certain width between the positive electrode conductor and the negative electrode conductor in the second direction, and the minimum width of the insulator is d, wherein d satisfies: 50nm≤d≤300nm.

[0012] According to some embodiments of the present invention, the photovoltaic cell further includes: a plurality of insulators, each insulator being disposed between two adjacent conductors, and each insulator extending along the third direction.

[0013] According to some embodiments of the present invention, the thickness of each insulator in the first direction is less than or equal to the thickness of each conductor.

[0014] According to some embodiments of this utility model, the number of positive conductors is the same as the number of negative conductors.

[0015] A photovoltaic cell string according to a second aspect of the present invention includes a plurality of photovoltaic cells, the plurality of photovoltaic cells being arranged along a third direction, and two adjacent photovoltaic cells being a first photovoltaic cell and a second photovoltaic cell, the photovoltaic cells being the photovoltaic cells according to the first aspect of the present invention described above; a plurality of solder strips, a portion of each solder strip being connected to the positive conductor of the first photovoltaic cell, and another portion of each solder strip being connected to the negative conductor of the second photovoltaic cell.

[0016] According to some embodiments of the present invention, the photovoltaic cell string further includes: a plurality of conductive adhesive members, each of the conductive adhesive members being located between the solder strip and the conductor of the photovoltaic cell in the first direction.

[0017] According to some embodiments of the present invention, the width of each of the conductive adhesive members in the second direction is less than or equal to the width of each of the conductors.

[0018] According to some embodiments of the present invention, the thickness of each conductive adhesive in the first direction is D3, and the width of each conductive adhesive in the second direction is W3, wherein D3 and W3 respectively satisfy: 10um≤D3≤200um, 0.1mm≤W3≤0.5mm.

[0019] A photovoltaic module according to a third aspect of the present invention includes a photovoltaic cell string according to the second aspect of the present invention described above.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a photovoltaic cell according to an embodiment of the present utility model;

[0023] Figure 2 This is a side view of a photovoltaic cell according to an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of a photovoltaic cell string according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of a photovoltaic cell and a solder ribbon according to an embodiment of the present utility model;

[0026] Figure 5 This is a side view of a photovoltaic cell string according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Photovoltaic cells;

[0029] 110. Battery cell body; 120. Conductor; 121. Negative conductor; 122. Positive conductor;

[0030] 200. Photovoltaic cell strings;

[0031] 210. Welding strip; 220. Conductive adhesive component. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-5 A photovoltaic cell 100 according to a first aspect embodiment of the present invention is described.

[0033] like Figure 1 and Figure 2 As shown, the photovoltaic cell 100 according to the first aspect embodiment of the present invention includes: a cell body 110 and a plurality of conductors 120. In the description of the present invention, "a plurality of" means two or more.

[0034] Specifically, multiple conductors 120 are disposed on the battery cell body 110 in the first direction (e.g., Figure 2 On one side surface of the structure (vertical direction), multiple conductors 120 are arranged along a second direction (e.g., vertical direction). Figure 1 The conductors are spaced apart in the left and right directions, and each conductor 120 is along a third direction (e.g., Figure 1 Extending in the vertical direction, the first direction, the second direction, and the third direction are orthogonal to each other. Among them, the plurality of conductors 120 include a plurality of negative conductors 121 and a plurality of positive conductors 122, and the plurality of negative conductors 121 and the plurality of positive conductors 122 are staggered and spaced apart along the second direction.

[0035] It should be noted that the photovoltaic cell 100 can be a back-contact cell, and the first direction can be the thickness direction of the photovoltaic cell 100. In specific implementations, the materials of the positive electrode conductor 122 and the negative electrode conductor 121 include, but are not limited to, transparent conductive oxides or other transparent conductive materials. For example, the positive electrode conductor 122 can be a P-region (P stands for positive, carrying a positive charge) conductor, and the negative electrode conductor 121 can be an N-region (N stands for negative, carrying a negative charge) conductor. Those skilled in the art can select according to actual needs, and this application embodiment does not make specific limitations. In addition, those skilled in the art can specifically select the number of positive electrode conductors 122 and negative electrode conductors 121 according to actual needs, and this application embodiment does not make specific limitations.

[0036] For example, in Figure 1In the example, all conductors 120 are strip-shaped structures, and all conductors 120 are disposed on the back side of the photovoltaic cell 100. There are 22 conductors 120, including 11 positive conductors 122 and 11 negative conductors 121. Each positive conductor 122 is disposed between two adjacent negative conductors 121, and the positive conductors 122 and negative conductors 121 need to be insulated to avoid short circuits. The two outermost conductors 120 in the second direction are the positive conductor 122 and the negative conductor 121, respectively.

[0037] When light shines on the solar cell body 110, the solar cell body 110 generates current due to photovoltaic power generation. At this time, the current can be transmitted through the positive conductor 122 and the negative conductor 121. Thus, while ensuring that the positive conductor 122 and the negative conductor 121 can transmit the current generated by the solar cell body 110, the main grid and sub-grid are saved, and the amount of silver paste used to manufacture the main grid and sub-grid is reduced, thereby reducing the cost of the photovoltaic cell 100.

[0038] Furthermore, by eliminating the main grid and sub-grid, the front side of the photovoltaic cell 100 is unobstructed by grid lines, eliminating light-shielding current loss caused by metal electrodes, maximizing the utilization of incident photons, and ensuring the electrical performance of the photovoltaic cell 100. Moreover, the positive electrode conductor 122 and the negative electrode conductor 121 are made of transparent conductive material, which can effectively collect photocurrent, improving the electrical performance and reliability of the photovoltaic cell 100.

[0039] In the second direction, the width of each negative electrode conductor 121 is smaller than the width of each positive electrode conductor 122. In specific implementation, the positive electrode conductor 122 mainly acts as an emitter, emitting electrons. Therefore, by making the width of the negative electrode conductor 121 smaller than the width of the positive electrode conductor 122, the emission area of ​​the positive electrode conductor 122 is increased, ensuring that the positive electrode conductor 122 can emit as many electrons as possible onto the negative electrode conductor 121, thereby improving the output power of the photovoltaic cell 100.

[0040] According to the embodiment of the present invention, the photovoltaic cell 100 has a positive electrode conductor 122 and a negative electrode conductor 121 disposed on the back side of the cell body 110, and the width of each negative electrode conductor 121 is smaller than the width of each positive electrode conductor 122. Compared with traditional solar cells, this saves silver paste consumption, reduces the cost of the photovoltaic cell 100, and increases the output power of the photovoltaic cell 100, thereby improving the electrical performance and reliability of the photovoltaic cell 100.

[0041] According to some embodiments of the present invention, the width of each negative conductor 121 in the second direction is W1, and the width of each positive conductor 122 is W2, wherein W1 and W2 satisfy: 1 ​​< W2 / W1 ≤ 2.

[0042] When W2 / W1 < 1, the width of the positive electrode conductor 122 is smaller than that of the negative electrode conductor 121, resulting in a smaller emission area of ​​the positive electrode conductor 122. Therefore, it is impossible to guarantee the emission of as many electrons as possible, which affects the output power of the photovoltaic cell 100. When W2 / W1 > 2, the width of the positive electrode conductor 122 is too large compared to the negative electrode conductor 121, which increases the manufacturing cost. In addition, the positive electrode conductor 122 emits too many electrons, and the negative electrode conductor 121 cannot match the emission amount of the positive electrode conductor 122, resulting in electrical loss and affecting the electrical performance of the photovoltaic cell 100.

[0043] Therefore, by setting the width ratio W2 / W1 of the positive conductor 122 and the negative conductor 121 between 1 and 2, the widths of the positive conductor 122 and the negative conductor 121 are set reasonably, which ensures both the electrical performance of the photovoltaic cell 100 and the output power of the photovoltaic cell 100.

[0044] Furthermore, W1 and W2 further satisfy: 0.2mm≤W1≤0.7mm, 0.2mm≤W2≤1.4mm. When W2<0.2mm, the width of the positive electrode conductor 122 is small, resulting in a small emission area of ​​the positive electrode conductor 122, which cannot guarantee the emission of as many electrons as possible, thus affecting the output power of the photovoltaic cell 100. When W2>1.4mm, the increased width of the positive electrode conductor 122 increases the manufacturing cost, and the excessive emission of electrons by the positive electrode conductor 122 means that the negative electrode conductor 121 cannot match the emission amount of the positive electrode conductor 122, causing electrical losses and thus affecting the electrical performance of the photovoltaic cell 100. Furthermore, when W1 < 0.2 mm, the negative conductor 121 cannot match the emission of the positive conductor 122, resulting in current loss and thus affecting the electrical performance of the photovoltaic cell 100. When W1 > 0.7 mm, due to the increased width of the negative conductor 121, the excessive width of the negative conductor 121 within the limited size of the cell body 110 will reduce the number of negative conductors 121 and also affect the output power of the photovoltaic cell 100.

[0045] Therefore, the width W1 of the positive electrode conductor 122 is set between 0.2mm and 1.4mm, and the width W2 of the negative electrode conductor 121 is set between 0.2mm and 0.7mm. This makes the widths of the positive electrode conductor 122 and the negative electrode conductor 121 reasonably set, which ensures both the electrical performance of the photovoltaic cell 100 and the output power of the photovoltaic cell 100.

[0046] According to some embodiments of this utility model, such as Figure 2 As shown, the thickness of each negative electrode conductor 121 in the first direction is D1, and the thickness of each positive electrode conductor 122 is D2, wherein D1 and D2 satisfy: 50nm≤D1≤150nm and 50nm≤D2≤150nm, respectively. When D1<50nm and / or D2<50nm, the conductivity of the negative electrode conductor 121 or the positive electrode conductor 122 may not meet the current requirements of the photovoltaic cell 100, thereby affecting the overall conductivity of the photovoltaic cell 100. When D1>150nm and / or D2>150nm, the thickness of the negative electrode conductor 121 and the positive electrode conductor 122 increases, increasing the manufacturing cost, and the weight of the negative electrode conductor 121 and the positive electrode conductor 122 increases, thereby increasing the weight of the photovoltaic cell 100. Therefore, by setting the thickness D2 of the positive electrode conductor 122 between 50nm and 150nm, and the thickness D1 of the negative electrode conductor 121 between 50nm and 150nm, the electrical performance of the photovoltaic cell 100 is guaranteed, while the manufacturing cost of the photovoltaic cell 100 is controlled.

[0047] According to some embodiments of this utility model, such as Figure 2 As shown, in the second direction, there is an insulator of a certain width between the negative conductor 121 and the positive conductor 122. The minimum width of the insulator is d, where d satisfies: 50nm ≤ d ≤ 300nm. When d < 50nm, the distance between the negative conductor 121 and the positive conductor 122 is small, and current may be generated between adjacent negative conductors 121 and positive conductors 122, causing a short circuit in the photovoltaic cell 100, thus affecting the electrical performance of the photovoltaic cell 100. When d > 300nm, the minimum distance between the negative conductor 121 and the positive conductor 122 is too large, causing the structure of the photovoltaic cell 100 to be dispersed, reducing the number of conductors 120, and affecting the output efficiency of the photovoltaic cell 100. Therefore, setting the minimum distance d between the positive conductor 122 and the negative conductor 121 between 50nm and 300nm ensures both the electrical performance and the output efficiency of the photovoltaic cell 100.

[0048] According to some embodiments of the present invention, the thickness of each insulator in the first direction is less than or equal to the thickness of each conductor 120, so as to avoid the formation of current by electron transfer on the top surface of adjacent negative conductors 121 and positive conductors 122, and further ensure the electrical performance of the photovoltaic cell 100.

[0049] According to some specific embodiments of this utility model, the number of negative conductors 121 is the same as the number of positive conductors 122, so that the negative conductors 121 and the positive conductors 122 correspond one-to-one, thereby ensuring the overall photoelectric conversion efficiency of the photovoltaic cell 100 and ensuring the electrical performance of the photovoltaic cell 100.

[0050] like Figures 3-5 As shown, the photovoltaic cell string 200 according to the second aspect embodiment of the present invention includes a plurality of photovoltaic cells 100 and a plurality of solder strips 210.

[0051] Specifically, multiple photovoltaic cells 100 are arranged along a third direction, with adjacent photovoltaic cells 100 being a first photovoltaic cell 100 and a second photovoltaic cell 100, respectively. The photovoltaic cells 100 are the photovoltaic cells 100 according to the first aspect embodiment of the present invention described above. A portion of each solder ribbon 210 is connected to the negative conductor 121 of the first photovoltaic cell 100, and another portion of each solder ribbon 210 is connected to the positive conductor 122 of the second photovoltaic cell 100.

[0052] For example, in Figure 3 In the example, multiple photovoltaic cells 100 can be arranged at intervals along a third direction. One end of the solder ribbon 210 is electrically connected to the negative conductor 121 of the first photovoltaic cell 100, and the other end of the solder ribbon 210 is electrically connected to the positive conductor 122 of the second photovoltaic cell 100, so as to connect multiple photovoltaic cells 100 in series to form a complete photovoltaic cell string 200.

[0053] According to the photovoltaic cell string 200 of this utility model embodiment, by using the above-mentioned photovoltaic cell 100, the output power of the photovoltaic cell string 200 can be guaranteed while reducing the consumption of silver paste and lowering the manufacturing cost.

[0054] According to some embodiments of the present invention, the photovoltaic cell string 200 further includes: a plurality of conductive adhesives 220, each conductive adhesive 220 being located between the solder ribbon 210 and the conductor 120 of the photovoltaic cell 100 in a first direction.

[0055] For example, in Figure 5 In the example, the conductive adhesive 220 is generally an arched strip structure. The conductive adhesive 220 can be made of conductive materials such as conductive glue, solder paste, and adhesive. Those skilled in the art can choose according to actual needs. The embodiments of this application are not specifically limited here.

[0056] This configuration can improve the connection strength between the solder ribbon 210 and the conductor 120, prevent the photovoltaic cell string 200 from failing due to the solder ribbon 210 detaching from the conductor 120, and ensure the connection reliability of the photovoltaic cell string 200. In addition, the conductive adhesive 220 is conductive, which can ensure that the solder ribbon 210 and the conductor 120 form a reliable electrical connection, further ensuring the electrical performance of the photovoltaic cell string 200.

[0057] Furthermore, in the second direction, the width of each conductive adhesive 220 is less than or equal to the width of each conductor 120. This prevents the conductive adhesive 220 from being too wide and interfering with the position of adjacent conductors 120, which could cause a short circuit between adjacent negative conductors 121 and positive conductors 122. This design ensures the operational reliability of the photovoltaic cell string 200. Additionally, the width of each conductive adhesive 220 is less than or equal to the width of each conductor 120, avoiding material waste in the conductive adhesive 220 and effectively controlling the manufacturing cost of the photovoltaic cell string 200.

[0058] According to some specific embodiments of this utility model, such as Figure 5 As shown, the thickness of each conductive adhesive 220 in the first direction is D3, and the width of each conductive adhesive 220 in the second direction is W3, wherein D3 and W3 satisfy: 10um≤D3≤200um, 0.1mm≤W3≤0.5mm respectively.

[0059] When D3 < 10 μm, the thickness of the conductive adhesive 220 is too small, which may prevent the solder ribbon 210 from being bonded to the conductor 120. Therefore, the connection strength and conductivity reliability between the solder ribbon 210 and the conductor 120 cannot be guaranteed. When D3 > 200 μm, the thickness of the conductive adhesive 220 is too large. The path of the current generated by the cell body 110 to the solder ribbon 210 increases, which will cause some electrical losses and affect the photoelectric conversion efficiency of the photovoltaic cell string 200. In addition, the increased thickness of the conductive adhesive 220 increases the weight and cost of the photovoltaic cell string 200. When W3 < 0.1 mm, the width of the conductive adhesive 220 is small, which may prevent the solder ribbon 210 from being bonded to the conductor 120. Therefore, the connection strength and conductivity reliability between the solder ribbon 210 and the conductor 120 cannot be guaranteed. When W3 > 0.5 mm, the width of the conductive adhesive 220 is large, which may overflow into the gaps between the conductors 120. Since the conductive adhesive 220 is conductive, it may cause current to be generated in adjacent conductors 120, causing a short circuit in the photovoltaic cell 100, thereby affecting the electrical performance of the photovoltaic cell 100. In addition, the increased width of the conductive adhesive 220 increases the weight and cost of the photovoltaic cell string 200.

[0060] Therefore, by setting the thickness D3 of the conductive adhesive 220 between 10um and 200um and the width W3 of the conductive adhesive 220 between 0.1mm and 0.5mm, the connection strength and conductivity reliability between the solder ribbon 210 and the conductor 120 are guaranteed, the photoelectric conversion efficiency of the photovoltaic cell string 200 is guaranteed, and the weight and cost of the photovoltaic cell string 200 are reduced.

[0061] Specifically, in the third direction, the length of the conductive adhesive 220 is greater than or equal to the length of the solder strip 210 and / or the conductor 120, so that it can completely cover the gap between the solder strip 210 and the conductor 120 in the third direction, further ensuring the connection strength and conductivity reliability of the solder strip 210 and the conductor 120.

[0062] According to some embodiments of this utility model, the photovoltaic cell string 200 is manufactured as follows:

[0063] S1: On the back side of the battery cell body 110, positive electrode conductors 122 and negative electrode conductors 121 are arranged alternately and at intervals along the second direction;

[0064] S2: Multiple photovoltaic cells 100 are spaced apart along a third direction, and conductive adhesive 220 is printed at the center position of the positive conductor 122 and the negative conductor 121 along the third direction.

[0065] S3: Place the solder ribbon 210 along the extension direction of the conductive adhesive 220, and press the solder ribbon 210 to the photovoltaic cell 100 by the pressure block;

[0066] S4: After the conductive adhesive 220 has cured, one end of the welding ribbon 210 is welded to the negative conductor 121 of the first photovoltaic cell 100, and the other end is welded to the positive conductor 122 of the second photovoltaic cell 100. Multiple photovoltaic cells 100 are connected to form a photovoltaic cell string 200, and the process temperature is kept below 200 degrees Celsius during the welding process.

[0067] This manufacturing method uses a lower process temperature, resulting in less warping of the photovoltaic cell 100 after welding. This prevents the photovoltaic cell 100 from cracking, reduces the defect rate, and improves its reliability. Furthermore, the lower temperature process allows for a reduction in the thickness of the photovoltaic cell 100, thus lowering its weight and cost. In addition, the flexible connection of multiple photovoltaic cells 100 via welding ribbons 210 further enhances the reliability of the photovoltaic string 200 under stress.

[0068] A photovoltaic module (not shown) according to a third aspect embodiment of the present invention includes a photovoltaic cell string 200 according to the second aspect embodiment of the present invention described above.

[0069] According to the photovoltaic module of the present invention, by adopting the above-mentioned photovoltaic cell string 200, the consumption of silver paste of the photovoltaic module can be reduced, the manufacturing cost can be reduced, the reliability of the photovoltaic module is high, and the process is simple.

[0070] Other components and operations of the photovoltaic modules according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0071] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0072] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic cell, characterized in that, include: The battery cell itself; Multiple conductors are disposed on one side surface of the battery cell body in a first direction, the multiple conductors are spaced apart along a second direction, and each conductor extends along a third direction, the first direction, the second direction and the third direction are orthogonal to each other; The plurality of conductors include a plurality of positive conductors and a plurality of negative conductors, which are staggered along the second direction, wherein the width of each negative conductor in the second direction is less than or equal to the width of each positive conductor.

2. The photovoltaic cell according to claim 1, characterized in that, In the second direction, the width of each negative conductor is W1, and the width of each positive conductor is W2, wherein W1 and W2 satisfy: 1≤W2 / W1≤2.

3. The photovoltaic cell according to claim 2, characterized in that, The W1 and W2 further satisfy the following conditions: 0.2mm≤W2≤1.4mm, 0.2mm≤W1≤0.7mm.

4. The photovoltaic cell according to claim 1, characterized in that, The thickness of each positive electrode conductor in the first direction is D1, and the thickness of each negative electrode conductor is D2, wherein D1 and D2 satisfy: 50nm≤D1≤150nm and 50nm≤D2≤150nm, respectively.

5. The photovoltaic cell according to claim 1, characterized in that, There is an insulator of a certain width between the positive electrode conductor and the negative electrode conductor in the second direction. The minimum width of the insulator is d, wherein d satisfies: 50nm≤d≤300nm.

6. The photovoltaic cell according to claim 1, characterized in that, Also includes: A plurality of insulators, each insulator being disposed between two adjacent conductors, each insulator extending along the third direction.

7. The photovoltaic cell according to claim 6, characterized in that, In the first direction, the thickness of each of the insulators is less than or equal to the thickness of each of the conductors.

8. The photovoltaic cell according to claim 1, characterized in that, The number of positive conductors is the same as the number of negative conductors.

9. A photovoltaic cell string, characterized in that, include: Multiple photovoltaic cells are arranged along the third direction, and two adjacent photovoltaic cells are respectively a first photovoltaic cell and a second photovoltaic cell, wherein the photovoltaic cells are photovoltaic cells according to any one of claims 1-8; Multiple solder strips, a portion of each solder strip being connected to the positive conductor of the first photovoltaic cell, and another portion of each solder strip being connected to the negative conductor of the second photovoltaic cell.

10. The photovoltaic cell string according to claim 9, characterized in that, Also includes: Multiple conductive adhesives, each of which is located between the solder ribbon and the conductor of the photovoltaic cell in the first direction.

11. The photovoltaic cell string according to claim 10, characterized in that, In the second direction, the width of each of the conductive adhesives is less than or equal to the width of each of the conductors.

12. The photovoltaic cell string according to claim 11, characterized in that, The thickness of each conductive adhesive in the first direction is D3, and the width of each conductive adhesive in the second direction is W3, wherein D3 and W3 satisfy: 10um≤D3≤200um, 0.1mm≤W3≤0.5mm respectively.

13. A photovoltaic module, characterized in that, Includes the photovoltaic cell string according to any one of claims 9-12.

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