Main-grid-free battery piece, battery string and photovoltaic module
By setting multiple first and second sub-grid lines on the cell body, a gridless cell design is achieved, solving the compatibility problem between the fully open steel plate technology and OBB technology, enhancing current transfer efficiency, reducing resistance, saving costs, and improving the performance of photovoltaic modules.
Patent Information
- Application Number
- CN202423181848.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing technologies, the fully open steel plate technology is incompatible with OBB technology, which leads to increased resistance between the solder strip and the sub-busbar, reducing the current transfer rate and the power of the photovoltaic module.
The design adopts a gridless solar cell, which increases the contact area between the electrical connector and the grid lines by setting multiple first and second sub-grid lines on the solar cell body. The first and second sub-grid lines are spaced apart and partially staggered in the second direction, thus eliminating the need for main grid printing.
This increases the current transfer efficiency between battery strings, reduces resistance, saves on processes and costs, and improves the power and efficiency of photovoltaic modules.
Smart Images
Figure CN223714516U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic technology field especially to a kind of no main grid cell piece, cell string and photovoltaic module. BACKGROUND
[0002] At present, 0BB technology (Zero Busbar Technology, namely no main grid design) and full opening steel plate technology become one of mainstream technologies, 0BB technology only needs to print auxiliary grid line, then uses welding band to connect auxiliary grid line, so that the manufacturing cost of main grid can be reduced, and full opening steel plate technology can realize finer and higher grid line printing.
[0003] In related art, full opening steel plate technology first prints segmented auxiliary grid line corresponding to welding band position on cell piece body, then secondly prints segmented main grid line, and finally main grid line and auxiliary grid line are connected into complete electrode pattern structure, so that not only 0BB technology and full opening steel plate technology cannot be compatible, but also the resistance between welding band and auxiliary grid line is increased, so that the transmission rate of current between cell strings and the power of photovoltaic module are reduced. SUMMARY
[0004] The utility model aims at at least solving one of the technical problems existing in prior art. To this end, one purpose of the utility model is to provide a kind of no main grid cell piece, which can reduce the resistance between electrical connector and auxiliary grid line, so that the transmission efficiency of current between cell strings can be increased, and then the power of photovoltaic module can be improved.
[0005] The utility model further provides a kind of cell string.
[0006] The utility model further provides a kind of photovoltaic module.
[0007] According to the no main grid cell piece of the first aspect embodiment of the utility model, it includes: cell piece body, first auxiliary grid group and second auxiliary grid group, the first auxiliary grid group is arranged on the cell piece body and includes a plurality of first auxiliary grid lines, a plurality of the first auxiliary grid lines are arranged at intervals in the first direction, the second auxiliary grid group is arranged on the cell piece body and is arranged at intervals with the first auxiliary grid group in the second direction, the first direction and the second direction are perpendicular, the second auxiliary grid group includes a plurality of second auxiliary grid lines, a plurality of the second auxiliary grid lines are arranged at intervals in the first direction, the first auxiliary grid line and the second auxiliary grid line are at least partially staggered in the second direction.
[0008] Therefore, by arranging the plurality of first sub-grid lines and the plurality of second sub-grid lines in the first direction of the cell body, and by arranging the first sub-grid lines and the second sub-grid lines to be spaced apart in the second direction and at least partially staggered, the plurality of first sub-grid lines and the plurality of second sub-grid lines can be printed on the cell body in a single printing process, and the portions of the first sub-grid lines and the second sub-grid lines that are staggered in the second direction can be connected to the electrical connectors. This arrangement can increase the contact area of the sub-grid lines and the electrical connectors, i.e., reduce the electrical resistance between the electrical connectors and the sub-grid lines, and can also eliminate the printing of the main grid, thereby increasing the efficiency of current transmission between the battery strings, saving process and cost, and achieving the purpose of reducing cost and increasing efficiency of the photovoltaic module.
[0009] According to some embodiments of the present application, in the second direction, the middle part of the second sub-grid line is arranged opposite to the gap between the two adjacent first sub-grid lines, and the two ends of the second sub-grid line are arranged opposite to the ends of the two adjacent first sub-grid lines that are close to each other.
[0010] According to some embodiments of the present application, the ends of the two adjacent first sub-grid lines that are close to each other are provided with a first electrical connection part, and the width of the first electrical connection part is greater than the width of the first sub-grid line; the two ends of the second sub-grid line are respectively provided with a second electrical connection part, and the width of the second electrical connection part is greater than the width of the second sub-grid line.
[0011] According to some embodiments of the present application, the first electrical connection part and the second electrical connection part are arranged opposite to each other in the second direction.
[0012] According to some embodiments of the present application, the length of the first electrical connection part is L1 and the width is d1, L1 and d1 satisfy the relationship: 0.65 μm≤L1≤0.75 μm, 50 μm≤d1≤70 μm; and / or the length of the second electrical connection part is L2 and the width is d2, L2 and d2 satisfy the relationship: 0.65 μm≤L2≤0.75 μm, 50 μm≤d2≤70 μm.
[0013] According to some embodiments of the present application, in the second direction, the length of one end of the second sub-grid line opposite to one end of the first sub-grid line is L3, and L3 satisfies the relationship: L3≥260 μm.
[0014] According to some embodiments of the present application, the width of the first sub-grid line is d3 and the height is h1, d3 and h1 satisfy the relationship: 20 μm≤d3≤23 μm, 14 μm≤h1≤16 μm; and / or the width of the second sub-grid line is d4 and the height is h2, d4 and h2 satisfy the relationship: 20 μm≤d4≤23 μm, 14 μm≤h2≤16 μm.
[0015] According to some embodiments of the present application, the first auxiliary grid lines and the second auxiliary grid lines both extend along the first direction.
[0016] According to the battery string of the second aspect of the present application, the battery string comprises a plurality of the above-mentioned no-main-grid battery pieces and an electrical connecting member, the electrical connecting member is at least partially arranged between two adjacent no-main-grid battery pieces, and the electrical connecting member is connected with the first auxiliary grid lines and the second auxiliary grid lines of the corresponding no-main-grid battery piece adjacent in the second direction.
[0017] According to the photovoltaic module of the third aspect of the present application, the photovoltaic module comprises the above-mentioned battery string.
[0018] Compared with the prior art, the present application adopts the mode that a plurality of first auxiliary grid lines and a plurality of second auxiliary grid lines are arranged in the first direction of the battery piece body, and the first auxiliary grid lines and the second auxiliary grid lines are partially staggered in the second direction, which not only enables the plurality of first auxiliary grid lines and the plurality of second auxiliary grid lines to be printed on the battery piece body by single printing, but also enables the partially staggered first auxiliary grid lines and second auxiliary grid lines in the second direction to be connected with the electrical connecting member, so that the contact area of the auxiliary grid lines and the electrical connecting member is increased, that is, the resistance between the electrical connecting member and the auxiliary grid lines is reduced, and the printing of the main grid can be omitted, thereby increasing the current transmission efficiency between the battery strings, saving the process and cost, and achieving the purpose of reducing cost and increasing efficiency of the photovoltaic module.
[0019] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
[0021] Figure 1 is a structural schematic diagram of a no-main-grid battery piece according to an embodiment of the present application;
[0022] Figure 2 is a partial structural schematic diagram of a battery string according to an embodiment of the present application.
[0023] LIST OF REFERENCES
[0024] 100, no-main-grid battery piece;
[0025] 10, battery piece body; 20, first auxiliary grid group; 21, first auxiliary grid line; 22, first electrical connecting part; 30, second auxiliary grid group; 31, second auxiliary grid line; 32, second electrical connecting part;
[0026] 200, an electrical connection. DETAILED DESCRIPTION
[0027] The embodiments of the present application are described below in detail with reference to the accompanying drawings. The embodiments of the present application described below with reference to the accompanying drawings are exemplary.
[0028] The embodiments of the present application are described below in detail with reference to the accompanying drawings. The embodiments of the present application described below with reference to the accompanying drawings are exemplary. Figure 1 And Figure 2 The main-free grid cell 100 according to the embodiments of the present application is described below.
[0029] As shown in FIG. 1, the main-free grid cell 100 according to the embodiments of the present application includes a cell body 10, a first sub-grid group 20 and a second sub-grid group 30. The first sub-grid group 20 is arranged on the cell body 10 and includes a plurality of first sub-grid lines 21. The plurality of first sub-grid lines 21 are arranged in the first direction. The second sub-grid group 30 is arranged on the cell body 10 and is arranged in the second direction away from the first sub-grid group 20. The first direction and the second direction are perpendicular. The second sub-grid group 30 includes a plurality of second sub-grid lines 31. The plurality of second sub-grid lines 31 are arranged in the first direction. The first sub-grid lines 21 and the second sub-grid lines 31 are at least partially staggered in the second direction. Figure 1 And Figure 2 It can be understood that the cell body 10, the first sub-grid group 20 and the second sub-grid group 30 constitute the main structure of the main-free grid cell 100. The cell body 10 provides a mounting space for the first sub-grid group 20 and the second sub-grid group 30, so as to facilitate the first sub-grid group 20 and the second sub-grid group 30 to collect the current of the cell body 10.
[0030] It can be understood that the cell body 10, the first sub-grid group 20 and the second sub-grid group 30 constitute the main structure of the main-free grid cell 100. The cell body 10 provides a mounting space for the first sub-grid group 20 and the second sub-grid group 30, so as to facilitate the first sub-grid group 20 and the second sub-grid group 30 to collect the current of the cell body 10.
[0031] It can be understood that the cell body 10, the first sub-grid group 20 and the second sub-grid group 30 constitute the main structure of the main-free grid cell 100. The cell body 10 provides a mounting space for the first sub-grid group 20 and the second sub-grid group 30, so as to facilitate the first sub-grid group 20 and the second sub-grid group 30 to collect the current of the cell body 10.
[0032] In addition, the plurality of first sub-grid lines 21 and the plurality of second sub-grid lines 31 can be printed on the battery piece body 10 by full opening steel printing, which can save the printing step, and can combine the 0BB technology and the full opening steel technology. Since the full opening steel cannot realize the simultaneous grooving in the warp and weft directions, the plurality of first sub-grid lines 21 and the plurality of second sub-grid lines 31 form a frameless sub-grid line, and the frameless sub-grid line does not affect the electroluminescence test, thereby saving the paste of the main grid and the sub-grid line frame, i.e. reducing the paste consumption by 5mg / W, thereby reducing the paste cost, and improving the power of the photovoltaic module 3W.
[0033] In addition, the plurality of first sub-grid lines 21 and the plurality of second sub-grid lines 31 are arranged at intervals in the first direction, so that each interval provides tension support in the second direction, thereby preventing deformation and damage of the plurality of first sub-grid lines 21 and the plurality of second sub-grid lines 31. A part of the first sub-grid line 21 and the second sub-grid line 31 is arranged in the second direction, so that the part of the first sub-grid line 21 and the second sub-grid line 31 forms a connection area of the electrical connection 200. The electrical connection 200 is elongated along the second direction, and the electrical connection 200 is connected with the first sub-grid line 21 and the second sub-grid line 31 respectively. The arrangement can increase the contact area of the first sub-grid line 21 and the second sub-grid line 31 with the electrical connection 200, thereby improving the transmission efficiency of the current, and allowing the first sub-grid line 21 and the second sub-grid line 31 to collect the current of the battery piece body 10 and transmit it to the adjacent battery piece through the electrical connection 200, thereby improving the power of the photovoltaic module.
[0034] Therefore, by arranging the plurality of first sub-grid lines 21 and the plurality of second sub-grid lines 31 in the first direction of the battery piece body 10, and arranging the first sub-grid line 21 and the second sub-grid line 31 at intervals and at least partially staggered in the second direction, the plurality of first sub-grid lines 21 and the plurality of second sub-grid lines 31 can be printed on the battery piece body 10 by single printing, and the part of the first sub-grid line 21 and the second sub-grid line 31 staggered in the second direction can be connected with the electrical connection 200. The arrangement can increase the contact area of the sub-grid line and the electrical connection 200, i.e. reduce the resistance between the electrical connection 200 and the sub-grid line, and can omit the printing of the main grid, thereby increasing the transmission efficiency of the current between the battery strings, saving the process and cost, and achieving the purpose of reducing cost and increasing efficiency of the photovoltaic module.
[0035] As shown in Figure 1 and Figure 2 in the second direction, the middle part of the second sub-grid line 31 is arranged opposite to the gap between the two adjacent first sub-grid lines 21, and the two ends of the second sub-grid line 31 are arranged opposite to the ends of the two adjacent first sub-grid lines 21 which are close to each other.
[0036] It can be understood that a gap is formed between two adjacent first sub-grid lines 21, and a plurality of gaps are formed between a plurality of first sub-grid lines 21, so that each gap can provide tension support in the second direction for the first sub-grid line 21, thereby preventing deformation and breakage of the plurality of first sub-grid lines 21. The middle part of the second sub-grid line 31 is arranged opposite to the gap in the second direction, so that the two ends of the second sub-grid line 31 in the first direction are arranged opposite to the respective one end of the two first sub-grid lines 21 forming the gap in the second direction, that is, at least a part of the first sub-grid line 21 and the second sub-grid line 31 are arranged in the second direction. The misalignment, so that the misaligned part of the first sub-grid line 21 and the second sub-grid line 31 forms a connection area of the electrical connection 200. The electrical connection 200 is elongated in the second direction, and the electrical connection 200 is connected to the first sub-grid line 21 and the second sub-grid line 31 respectively. The above arrangement can increase the contact area of the first sub-grid line 21 and the second sub-grid line 31 with the electrical connection 200, that is, reduce the resistance between the first sub-grid line 21 and the second sub-grid line 31 and the electrical connection 200, thereby improving the transmission efficiency of the current. In addition, the first sub-grid line 21 and the second sub-grid line 31 can collect the current of the battery piece body 10 and transmit it to the adjacent battery piece through the electrical connection 200, thereby improving the power of the photovoltaic module.
[0037] In addition, as shown in Figure 1 The two ends of the adjacent two first sub-grid lines 21 close to each other are provided with a first electrical connection part 22, and the width of the first electrical connection part 22 is greater than the width of the first sub-grid line 21; the two ends of the second sub-grid line 31 are respectively provided with a second electrical connection part 32, and the width of the second electrical connection part 32 is greater than the width of the second sub-grid line 31.
[0038] That is, the first electric connection part 22 is arranged at the end of the first sub-grid line 21 close to the adjacent first sub-grid line 21, the first electric connection part 22 is arranged at both ends of the first sub-grid line 21 located in the middle in the first direction, the first electric connection part 22 is arranged at the end of the first sub-grid line 21 close to the middle in the first direction, the second electric connection part 32 is arranged at the end of the second sub-grid line 31 close to the adjacent second sub-grid line 31, the second electric connection part 32 is arranged at both ends of the second sub-grid line 31 located in the middle in the first direction, and the second electric connection part 32 is arranged at the end of the second sub-grid line 31 close to the middle in the first direction, so that the first electric connection part 22 and the second electric connection part 32 can be connected to the electric connection piece 200, and then the current collected by the first sub-grid line 21 and the second sub-grid line 31 can be transmitted to the adjacent battery piece through the electric connection piece 200. In addition, the width of the first electric connection part 22 is greater than the width of the first sub-grid line 21, and the width of the second electric connection part 32 is greater than the width of the second sub-grid line 31. In this way, the first electric connection piece 200 and the second electric connection piece 200 can be in contact with the electric connection piece 200, and the contact area between the first electric connection part 22 and the second electric connection part 32 and the electric connection piece 200 can be increased, that is, the resistance between the first sub-grid line 21 and the second sub-grid line 31 and the electric connection piece 200 can be reduced, so that the current transmission efficiency can be improved, and the current collected by the first sub-grid line 21 and the second sub-grid line 31 can be transmitted to the adjacent battery piece through the electric connection piece 200, thereby improving the power of the photovoltaic module.
[0039] As shown in Figure 1 and Figure 2 , the first electric connection part 22 and the second electric connection part 32 are arranged opposite to each other in the second direction. It can be understood that a part of the first sub-grid line 21 and the second sub-grid line 31 are arranged in the second direction. In this way, the first electric connection part 22 and the second electric connection part 32 can be arranged opposite to each other in the second direction, the electric connection piece 200 is elongated along the second direction, and the electric connection piece 200 is connected to the first electric connection part 22 and the second electric connection part 32, respectively. In this way, the contact area between the first sub-grid line 21 and the second sub-grid line 31 and the electric connection piece 200 can be increased, that is, the resistance between the first sub-grid line 21 and the second sub-grid line 31 and the electric connection piece 200 can be reduced, so that the current transmission efficiency can be improved, and the current collected by the first sub-grid line 21 and the second sub-grid line 31 can be transmitted to the adjacent battery piece through the electric connection piece 200, thereby improving the power of the photovoltaic module.
[0040] Optionally, the length of the first electric connecting part 22 is L1 and the width is d1, L1 and d1 satisfy the relationship: 0.65 μm≤L1≤0.75 μm, 50 μm≤d1≤70 μm. That is, the length of the first electric connecting part 22 is within a reasonable range. If the length of the first electric connecting part 22 is less than 0.65 μm, the contact area between the first electric connecting part 22 and the electric connecting piece 200 is too small, which affects the current transmission rate between the first sub-grid line 21 and the electric connecting piece 200. If the length of the first electric connecting part 22 is greater than 0.75 μm, the amount of paste used by the first electric connecting part 22 is too much, which is difficult to achieve the purpose of cost saving. If the length of the first electric connecting part 22 is within a reasonable range, not only can it ensure sufficient contact between the first electric connecting part 22 and the electric connecting piece 200 and reduce the resistance between the first electric connecting part 22 and the electric connecting piece 200, but also can achieve the purpose of reducing cost and increasing efficiency of the photovoltaic module. For example, the length of the first electric connecting part 22 is 0.665 μm, 0.686 μm, or 0.7 μm. The specific value is selected according to the actual situation.
[0041] The width of the first electric connecting part 22 is within a reasonable range. If the width of the first electric connecting part 22 is less than 50 μm, the contact area between the first electric connecting part 22 and the electric connecting piece 200 is too small, which affects the current transmission rate between the first sub-grid line 21 and the electric connecting piece 200. If the width of the first electric connecting part 22 is greater than 70 μm, the amount of paste used by the first electric connecting part 22 is too much, which is difficult to achieve the purpose of cost saving. If the width of the first electric connecting part 22 is within a reasonable range, not only can it ensure sufficient contact between the first electric connecting part 22 and the electric connecting piece 200 and reduce the resistance between the first electric connecting part 22 and the electric connecting piece 200, but also can achieve the purpose of reducing cost and increasing efficiency of the photovoltaic module. For example, the length of the first electric connecting part 22 is 55 μm, 60 μm, or 65 μm. The specific value is selected according to the actual situation.
[0042] Optionally, the length of the second electrical connecting part 32 is L2 and the width is d2, L2 and d2 satisfy the relationship: 0.65 μm≤L2≤0.75 μm, 50 μm≤d2≤70 μm. That is, the length of the second electrical connecting part 32 is within a reasonable range. If the length of the second electrical connecting part 32 is less than 0.65 μm, the contact area between the second electrical connecting part 32 and the electrical connecting member 200 is too small, which affects the current transmission rate between the second sub-grid line 31 and the electrical connecting member 200. If the length of the second electrical connecting part 32 is greater than 0.75 μm, the amount of paste used by the second electrical connecting part 32 is too much, which makes it difficult to achieve the purpose of cost saving. If the length of the second electrical connecting part 32 is within a reasonable range, not only can it ensure sufficient contact between the second electrical connecting part 32 and the electrical connecting member 200 and reduce the resistance between the second electrical connecting part 32 and the electrical connecting member 200, but also can achieve the purpose of reducing the cost of the photovoltaic module. For example, the length of the second electrical connecting part 32 is 0.665 μm, 0.686 μm, or 0.726 μm. The specific value is selected according to the actual situation.
[0043] The width of the second electrical connecting part 32 is within a reasonable range. If the width of the second electrical connecting part 32 is less than 50 μm, the contact area between the second electrical connecting part 32 and the electrical connecting member 200 is too small, which affects the current transmission rate between the second sub-grid line 31 and the electrical connecting member 200. If the width of the second electrical connecting part 32 is greater than 70 μm, the amount of paste used by the second electrical connecting part 32 is too much, which makes it difficult to achieve the purpose of cost saving. If the width of the second electrical connecting part 32 is within a reasonable range, not only can it ensure sufficient contact between the second electrical connecting part 32 and the electrical connecting member 200 and reduce the resistance between the second electrical connecting part 32 and the electrical connecting member 200, but also can achieve the purpose of reducing the cost of the photovoltaic module. For example, the length of the second electrical connecting part 32 is 57 μm, 60 μm, or 67 μm. The specific value is selected according to the actual situation.
[0044] Optionally, in the second direction, the length of one end of the second sub-grid line 31 opposite to one end of the first sub-grid line 21 is L3, and L3 satisfies the relationship: L3≥260μm. It can be understood that the length of one end of the second sub-grid line 31 opposite to one end of the first sub-grid line 21 should be within a reasonable range. If the length of one end of the second sub-grid line 31 opposite to one end of the first sub-grid line 21 is less than 260μm, the width of the electrical connecting piece 200 will be greater than the length of one end of the second sub-grid line 31 opposite to one end of the first sub-grid line 21, which will cause the electrical connecting piece 200 to miss the connection with the first sub-grid line 21 and the second sub-grid line 31, and the current collected by the first sub-grid line 21 and the second sub-grid line 31 cannot be fully conducted to the adjacent battery piece through the electrical connecting piece 200. If the length of one end of the second sub-grid line 31 opposite to one end of the first sub-grid line 21 is within a reasonable range, it can be ensured that the electrical connecting piece 200 is connected with the first sub-grid line 21 and the second sub-grid line 31 without missing, so as to improve the current transmission efficiency, and the current collected by the first sub-grid line 21 and the second sub-grid line 31 from the battery piece body 10 can be transmitted to the adjacent battery piece through the electrical connecting piece 200, thereby improving the power of the photovoltaic module. For example, the length of one end of the second sub-grid line 31 opposite to one end of the first sub-grid line 21 is 260μm, 270μm, or 280μm, and the specific value is selected according to the actual situation.
[0045] Optionally, the width of the first sub-grid line 21 is d3 and the height is h1, and d3 and h1 satisfy the relationship: 20μm≤d3≤23μm, 14μm≤h1≤16μm. That is, the width of the first sub-grid line 21 should be within a reasonable range. If the width of the first sub-grid line 21 is less than 20μm, the width of the first sub-grid line 21 will be too small, which will affect the current collecting capacity of the first sub-grid line 21, thereby affecting the rate of the current collected by the first sub-grid line 21 from the battery piece body 10 and then transmitted to the adjacent battery piece through the electrical connecting piece 200, and further affecting the power of the photovoltaic module. If the width of the first sub-grid line 21 is greater than 23μm, too much paste will be used for the first sub-grid line 21, which is difficult to achieve the purpose of cost saving. If the width of the first sub-grid line 21 is within a reasonable range, it can not only ensure the current rate between the first sub-grid line 21 and the electrical connecting piece 200, but also achieve the purpose of reducing cost and increasing efficiency of the photovoltaic module. For example, the width of the first sub-grid line 21 is 20μm, 21μm, or 22μm, and the specific value is selected according to the actual situation.
[0046] The height of the first sub-grid line 21 should be within a reasonable range. If the height of the first sub-grid line 21 is less than 14 μm, the height of the first sub-grid line 21 will be too small, which will affect the current collecting ability of the first sub-grid line 21, thereby affecting the rate at which the current collected by the first sub-grid line 21 from the battery piece body 10 is transmitted to the adjacent battery piece through the electrical connecting piece 200, and further affecting the power of the photovoltaic module. If the height of the first sub-grid line 21 is greater than 16 μm, too much paste will be used for the first sub-grid line 21, which makes it difficult to achieve the purpose of cost saving. If the height of the first sub-grid line 21 is within a reasonable range, not only can the rate of current between the first sub-grid line 21 and the electrical connecting piece 200 be ensured, but also the purpose of reducing cost and increasing efficiency of the photovoltaic module can be achieved. For example, the height of the first sub-grid line 21 is 14 μm, 15 μm, or 16 μm, and the specific value is selected according to the actual situation.
[0047] Optionally, the width of the second sub-grid line 31 is d4 and the height is h2, and d4 and h2 satisfy the relationship: 20 μm≤d4≤23 μm, 14 μm≤h2≤16 μm. That is, the width of the second sub-grid line 31 should be within a reasonable range. If the width of the second sub-grid line 31 is less than 20 μm, the width of the second sub-grid line 31 will be too small, which will affect the current collecting ability of the second sub-grid line 31, thereby affecting the rate at which the current collected by the second sub-grid line 31 from the battery piece body 10 is transmitted to the adjacent battery piece through the electrical connecting piece 200, and further affecting the power of the photovoltaic module. If the width of the second sub-grid line 31 is greater than 23 μm, too much paste will be used for the second sub-grid line 31, which makes it difficult to achieve the purpose of cost saving. If the width of the second sub-grid line 31 is within a reasonable range, not only can the rate of current between the second sub-grid line 31 and the electrical connecting piece 200 be ensured, but also the purpose of reducing cost and increasing efficiency of the photovoltaic module can be achieved. For example, the width of the second sub-grid line 31 is 20 μm, 21 μm, or 22 μm, and the specific value is selected according to the actual situation.
[0048] The height of the second sub-grid line 31 should be within a reasonable range. If the height of the second sub-grid line 31 is less than 14 μm, the height of the second sub-grid line 31 will be too small, which will affect the current collecting ability of the second sub-grid line 31, thereby affecting the rate at which the current collected by the second sub-grid line 31 from the battery piece body 10 is transmitted to the adjacent battery piece through the electrical connecting piece 200, and further affecting the power of the photovoltaic module. If the height of the second sub-grid line 31 is greater than 16 μm, too much paste will be used for the second sub-grid line 31, which makes it difficult to achieve the purpose of cost saving. If the height of the second sub-grid line 31 is within a reasonable range, not only can the rate of current between the second sub-grid line 31 and the electrical connecting piece 200 be ensured, but also the purpose of reducing cost and increasing efficiency of the photovoltaic module can be achieved. For example, the height of the second sub-grid line 31 is 14 μm, 15 μm, or 16 μm, and the specific value is selected according to the actual situation.
[0049] As Figure 2 shown, the battery string according to the second aspect of the utility model, including: a plurality of above embodiment's no main grid battery piece 100 and electric connection piece 200, electric connection piece 200 is at least partially arranged between two adjacent no main grid battery piece 100, and electric connection piece 200 is connected with the first auxiliary grid line 21 and the second auxiliary grid line 31 of corresponding no main grid battery piece 100 in the second direction adjacent.
[0050] It can be understood that no main grid battery piece 100 includes a plurality of first auxiliary grid lines 21 and a plurality of second auxiliary grid lines 31, and the first auxiliary grid lines 21 and the second auxiliary grid lines 31 are partially staggered in the second direction, so that the staggered parts of the first auxiliary grid lines 21 and the second auxiliary grid lines 31 form the connection area of the electric connection piece 200, the electric connection piece 200 is elongated along the second direction, and the electric connection piece 200 is connected with the first auxiliary grid line 21 and the second auxiliary grid line 31 respectively, which can increase the contact area of the first auxiliary grid line 21 and the second auxiliary grid line 31 with the electric connection piece 200, thereby improving the transmission efficiency of the current, and the current collected by the first auxiliary grid line 21 and the second auxiliary grid line 31 of the battery piece body 10 can be transmitted to the adjacent battery piece through the electric connection piece 200, a plurality of no main grid battery pieces 100 are connected in series through the electric connection piece 200 to form a battery string, thereby improving the power of the photovoltaic module. The electric connection piece 200 can be a solder strip, and the electric connection piece 200 can be a plurality of electric connection pieces 200, which can be arranged at intervals in the first direction to connect the first auxiliary grid line 21 and the second auxiliary grid line 31 adjacent in the second direction.
[0051] The photovoltaic module according to the third aspect of the utility model comprises the battery string of the above embodiments. By arranging a plurality of first auxiliary grid lines 21 and a plurality of second auxiliary grid lines 31 in the first direction of the battery piece body 10, the first auxiliary grid lines 21 and the second auxiliary grid lines 31 are arranged at intervals and partially staggered in the second direction, which not only allows the plurality of first auxiliary grid lines 21 and the plurality of second auxiliary grid lines 31 to be printed on the battery piece body 10 at a single time, but also allows the partially staggered parts of the first auxiliary grid lines 21 and the second auxiliary grid lines 31 in the second direction to be connected with the electric connection piece 200, which can increase the contact area of the auxiliary grid lines and the electric connection piece 200, i.e., reduce the resistance between the electric connection piece 200 and the auxiliary grid lines, and also can omit the printing of the main grid, thereby increasing the transmission efficiency of the current between the battery strings, saving the process and cost, and achieving the purpose of reducing cost and increasing efficiency of the photovoltaic module.
[0052] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and so on the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation configuration and operation, therefore can not be understood as the restriction of the utility model.
[0053] In the description of the utility model, "first feature", "second feature" can include one or more features.In the description of the utility model, "multiple" means two or more than two.In the description of the utility model, the first feature is "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them.In the description of the utility model, the first feature is "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.
[0054] In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model.In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.
[0055] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and its equivalents.
Claims
1. A no- grid battery cell (100), characterized in that, include: Battery cell body (10); The first sub-grid group (20) is disposed on the battery cell body (10) and includes a plurality of first sub-grid lines (21), the plurality of first sub-grid lines (21) being spaced apart in a first direction; The second sub-gate group (30) is disposed on the battery cell body (10) and spaced apart from the first sub-gate group (20) in a second direction. The first direction and the second direction are perpendicular. The second sub-gate group (30) includes a plurality of second sub-gate lines (31). The plurality of second sub-gate lines (31) are spaced apart in the first direction. The first sub-gate lines (21) and the second sub-gate lines (31) are at least partially staggered in the second direction.
2. The no-finger cell sheet (100) according to claim 1, characterized in that, In the second direction, the middle part of the second sub-gate line (31) is positioned opposite to the gap between the two adjacent first sub-gate lines (21), and the two ends of the second sub-gate line (31) are positioned opposite to the adjacent ends of the two adjacent first sub-gate lines (21) that are close to each other.
3. The no-finger cell sheet (100) according to claim 2, characterized in that, A first electrical connection portion (22) is provided at one end of each of two adjacent first sub-gate lines (21), and the width of the first electrical connection portion (22) is greater than the width of the first sub-gate line (21); The second sub-gate line (31) is provided with a second electrical connection part (32) at both ends, and the width of the second electrical connection part (32) is greater than the width of the second sub-gate line (31).
4. The no-finger cell sheet (100) according to claim 3, characterized in that, The first electrical connection portion (22) and the second electrical connection portion (32) are disposed opposite to each other in the second direction.
5. The no-finger cell sheet (100) according to claim 3, characterized in that, The first electrical connection portion (22) has a length of L1 and a width of d1, where L1 and d1 satisfy the following relationships: 0.65μm≤L1≤0.75μm, 50μm≤d1≤70μm; and / or The second electrical connection part (32) has a length of L2 and a width of d2. L2 and d2 satisfy the following relationship: 0.65μm≤L2≤0.75μm, 50μm≤d2≤70μm.
6. The no-finger cell sheet (100) according to claim 2, characterized in that, In the second direction, the length of one end of the second sub-gate line (31) relative to one end of the first sub-gate line (21) is L3, and L3 satisfies the relationship: L3≥260μm.
7. The no-finger cell sheet (100) according to claim 2, characterized in that, The width of the first sub-gate line (21) is d3 and the height is h1, where d3 and h1 satisfy the following relationships: 20μm≤d3≤23μm, 14μm≤h1≤16μm; and / or The width of the second sub-gate line (31) is d4 and the height is h2. d4 and h2 satisfy the following relationship: 20μm≤d4≤23μm, 14μm≤h2≤16μm.
8. The no-finger cell sheet (100) according to claim 1, characterized in that, Both the first sub-gate line (21) and the second sub-gate line (31) extend along the first direction.
9. A battery string, characterized by include: The gridless solar cell (100) according to any one of claims 1-8; An electrical connecting piece (200) is arranged at least partially between two adjacent bus bar-free cells (100), and is connected with the first and second sub-grid lines (21, 31) of the corresponding bus bar-free cell (100) adjacent in the second direction.
10. A photovoltaic module, characterized by Comprising: The battery string of claim 9.