Battery piece
By designing a 182*199 square millimeter cell slice and utilizing its non-equally spaced and equally spaced grid line structures, mass production of cell slices suitable for different photovoltaic modules has been achieved, solving the problem of low production efficiency in the existing technology. Reduce cost and time loss.
Patent Information
- Application Number
- CN202420834023.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-04-22
AI Technical Summary
There are limited types of existing photovoltaic cell modules. When companies batch-preparing battery slices of different sizes, they need to frequently switch the originals and tooling fixtures to be cut and processed of different sizes, resulting in a decrease in production efficiency.
Design a battery sheet with a size of 182*199 mm2. There are 2n non-equally spaced first grid lines on the front and 2h equally spaced second grid lines on the back. The battery sheet can be batched by cutting it. Produce battery slices suitable for 199 modules, 188 modules and 210 modules.
Battery slices of different sizes can be cut without changing the overall size of the battery slices, which reduces the cost and time loss caused by changing tooling fixtures, avoids accidents of mixed use of laser printing templates, and improves production efficiency.
Smart Images
Figure CN222396020U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic cells, mainly a battery sheet. Background Art
[0002] Against the backdrop of economic and technological globalization, photovoltaic technology, as an important component of new energy technology, is increasingly valued for its economic benefits.
[0003] With the development of solar photovoltaic cell manufacturing industry, the market has increasingly higher requirements for new performance of photovoltaic cell power generation. Among them, TOPCon (Tunnel Oxide Passivated Contact solar cell) cells are deeply favored by solar cell manufacturing and related industries due to their obvious advantages such as high conversion efficiency, low attenuation performance, high mass production cost performance, etc.
[0004] However, the inventors realize that the types of photovoltaic modules currently produced by various enterprises are limited, and most enterprises target 199 modules, 188 modules and 210 modules. Therefore, when enterprises mass-produce cell slices that match the above three types of photovoltaic modules, they need to frequently switch between the original cell slices of different sizes to be cut and processed, and also need to switch the tooling fixtures, resulting in a decrease in production efficiency, given the different sizes of the three types of cell slices. Utility Model Content
[0005] In view of the above-mentioned deficiencies or shortcomings, the present invention provides a battery cell. If the battery cell is used as the original part to be processed, battery slices that conform to 199 components, 188 components and 210 components can be cut into batches.
[0006] The utility model provides a battery cell, the size of which is 182*199 square millimeters, the front side of the battery cell is provided with 2n first grid lines with non-uniform spacing, and the back side of the battery cell is provided with 2h second grid lines with equal spacing;
[0007] The first longitudinal side and the second longitudinal side of the battery cell are both 199 mm, the first transverse side and the second transverse side of the battery cell are both 182 mm, the spacing of the first grid lines is the longitudinal spacing between two adjacent first grid lines, and n and h are both positive integers;
[0008] The front and back sides of the battery slice are also provided with a first cutting line and a second cutting line, and two symmetrical and interconnected battery slices are provided on both sides of the first cutting line, and the size of each battery slice is 182*99.5 square millimeters, and the front side of each battery slice is provided with n first grid lines, and the back side of each battery slice is provided with h second grid lines;
[0009] Two asymmetrical and interconnected first battery slices and second battery slices are arranged on both sides of the second cutting line. The size of the first battery slice is 182*94 square millimeters, and the size of the second battery slice is 182*105 square millimeters.
[0010] In some embodiments, the front side of the first battery slice is provided with 83 or 84 first grid lines, and the back side of the first battery slice is provided with 90 or 91 fine grids; the front side of the second battery slice is provided with 2n-83 or 2n-84 first grid lines, and the back side of the second battery slice is provided with 2h-90 or 2h-91 second grid lines.
[0011] In some embodiments, n=88, and the first grid line spacing on the front side of the solar cell is 1.2865 mm and 1.375 mm; wherein the spacing of 1.2865 mm and the spacing of 1.375 mm are arranged alternately.
[0012] In some embodiments, the second grid line spacing on the back side of the cell is 1.034 mm, h=96.
[0013] In some embodiments, 16 columns of first main grids are disposed on the front side of the battery cell; wherein, each column of first main grids on the front side of the battery cell is provided with 10 wiring points; and each first main grid is parallel to the first longitudinal side.
[0014] In some embodiments, 16 columns of second main grids are arranged on the back of the solar cell, and 12 wiring points are arranged on each column of second main grids on the back of the solar cell; each second main grid is parallel to the first longitudinal side.
[0015] In some embodiments, the spacing between two adjacent rows of wiring points on the front side of the battery cell is equal, and the spacing between two adjacent rows of wiring points on the back side of the battery cell is equal; each row of wiring points is parallel to the first lateral side.
[0016] In some embodiments, the two rows of wiring points near the first lateral side and the second lateral side are 7.5 mm away from the first lateral side and the second lateral side respectively, and the two rows of wiring points near the first cutting line of the battery cell are 7.5 mm away from the first cutting line.
[0017] In some embodiments, on the front side of the battery cell, the size of the wiring point is 1.0-1.51*0.5-0.7 square millimeters.
[0018] In some embodiments, on the back side of the battery cell, the size of the wiring point is 0.8-1.32*0.4-0.6 square millimeters.
[0019] In the above scheme, since the size of the battery cell is 182*199 square millimeters, the front of the battery cell is provided with 2n non-equally spaced first grid lines, and the back is provided with 2h equally spaced second grid lines, so when the battery cell is cut along the first cutting line, two identical battery slices can be obtained, and the battery slices correspond to the 199 component. When the battery cell is cut along the second cutting line, the first battery slice and the second battery slice can be obtained, wherein the first battery slice corresponds to the 188 component, and the second battery slice corresponds to the 210 component. Therefore, when an enterprise needs to mass-produce battery slices that match the 199 component, the 188 component, or the 210 component:
[0020] 1. Since there is no need to change the overall size of the battery cell, the cost disadvantage and time loss caused by the change of tooling and fixtures can be reduced.
[0021] 2. In the process of preparing the grid lines, a laser printing template corresponding to the size of the cell can be used all the time without switching the template, thus avoiding grid line printing errors caused by mixing templates.
[0022] It should be noted that when preparing the grid lines for the above-mentioned battery cells, it is necessary to laser the first grid line position on the front of the battery cell to improve the contact ability between the laser processing slurry and the silicon wafer. Under the traditional production method, in order to batch cut battery slices of different sizes, the sizes of battery cells to be processed are different, resulting in the need to design multiple sets of laser printing templates of different sizes. Therefore, whenever the size of the battery slices to be produced is switched, the laser printing template needs to be switched to complete the grid line preparation of the laser printing template, which can easily cause accidents of mixing laser printing templates. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A schematic diagram of a laser printing template in one or more embodiments of the utility model;
[0024] Figure 2 A schematic diagram of a grid line structure of a battery cell in one or more embodiments of the utility model;
[0025] Figure 3 A schematic diagram of a grid line structure of a battery cell after symmetrical cutting in one or more embodiments of the utility model;
[0026] Figure 4 A schematic diagram of a grid line structure of a battery cell after asymmetric cutting in one or more embodiments of the utility model;
[0027] Figure 5 A schematic diagram of a main grid structure designed for a 5PAD point on the front side of a solar cell in one or more embodiments of the utility model;
[0028] Figure 6 A schematic diagram of a main grid structure designed with 5PAD points on the front side of a solar cell after symmetrical cutting in one or more embodiments of the utility model;
[0029] Figure 7 A schematic diagram of a main grid structure designed with 5PAD points on the front side of a solar cell after asymmetric cutting in one or more embodiments of the utility model;
[0030] Figure 8 The figure is a schematic diagram of the setting position of a PAD point on a grid line in one or more embodiments of the utility model. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0032] It should be noted that when a part or component is considered to be "connected", "located", or "assembled" on another part or component, it may be directly disposed on the other part or component or there may be a central part or component at the same time. The terms "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only.
[0033] The utility model provides a battery cell, such as Figure 2 As shown, the size of the cell is 182*199 square millimeters, the front of the cell is provided with 2n first grid lines with non-uniform spacing, and the back of the cell is provided with 2h second grid lines with equal spacing;
[0034] The first longitudinal side and the second longitudinal side of the battery cell are both 199 mm in size, the first transverse side and the second transverse side of the battery cell are both 182 mm in size, each first grid line is parallel to the first transverse side, the spacing between the first grid lines is the longitudinal spacing between two adjacent first grid lines, and n and h are both positive integers;
[0035] The front and back sides of the cell are also provided with a first cutting line S 1 and the second cutting line S 2 , at the first cutting line S 1 Two symmetrical and interconnected battery slices are provided on both sides of the battery, each battery slice has a size of 182*99.5 square millimeters, and the front grid line structure of each battery slice is provided with n first grid lines, and the back grid line structure is provided with h second grid lines;
[0036] At the second cutting line S 2Two asymmetrical and interconnected first and second battery slices are provided on both sides of the , the size of the first battery slice is 182*94 square millimeters, and the size of the second battery slice is 182*105 square millimeters. Specifically, in order to prepare battery slices that fit the 199 module and have a size of 182*99.5 square millimeters, the production personnel use a grid line structure such as Figure 2 The cell shown is used as the original part to be cut and processed. The grid line structure of the cell specifically includes a symmetrical first structure 110 and a second structure 120. The connecting line between the first structure 110 and the second structure 120 can be used as the first cutting line S 1 , and the first cutting line S 1 It can be located on the front side of the battery cell or on the back side thereof. 1 After cutting, Figure 3 As shown, the first structure 110 and the second structure 120 are separated and each is used as a battery slice with a size of 182*99.5 square millimeters. Therefore, in the process of preparing the battery slice with a size of 182*99.5 square millimeters, there is no need to change the overall size of the battery sheet, reducing the cost disadvantage and time loss caused by the change of the tooling fixture during cutting.
[0037] Specifically, Figure 4 As shown in the figure, when the production personnel need to produce battery slices that match the 188 components and 210 components, they will Figure 2 The cell shown is cut by laser along the second cutting line S 2 Symmetrical cutting is performed to obtain two separate battery slices 310 and 320. mm, mm, L = 182 mm. Similarly, the laser cutting method can be a second cutting line S along the front of the battery cell. 2 Position processing can also be a second cutting line S along the back 2 Then the cell is cut along the second cutting line S 2 After asymmetric cutting at the position, the first battery slice 310 has a size of 182*94 square millimeters for installation on the 188 component, and the second battery slice 320 has a size of 182*105 square millimeters for installation on the 210 component.
[0038] Moreover, in the process of preparing the battery slice, the overall size of the battery slice does not need to be changed, which reduces the cost disadvantage and time loss caused by the change of the tooling fixture during cutting. Moreover, in the process of preparing the first battery slice and the second battery slice, the overall size of the battery slice does not need to be changed, which reduces the cost disadvantage and time loss caused by the change of the tooling fixture during cutting.
[0039] In some embodiments, the front side of the first battery slice is provided with 83 or 84 first grid lines, and the back side of the first battery slice is provided with 90 or 91 second grid lines; the front side of the second battery slice is provided with 2n-83 or 2n-84 first grid lines, and the back side of the second battery slice is provided with 2h-90 or 2h-91 second grid lines.
[0040] Specifically, the actual values of n and h are set according to the actual use of the battery slice. 1 When the cell slices are cut symmetrically, the numbers of the first grid lines and the second grid lines of the two cell slices obtained are n and h, respectively. 2 When cutting asymmetrically, you need to first cut according to the second cutting line S 2 The second cutting line S is determined at the connection position on the first longitudinal side of 199 mm. 2 The grid line distribution ratio on both sides. Finally, it can be determined that the theoretical number of grid lines on the front and back of the first battery slice is 188n / 199 and 188h / 199 respectively, and the theoretical number of grid lines on the front and back of the second battery slice is 210n / 199 and 210h / 199 respectively. Since the above four theoretical numbers are not integers, after calculation, the front of the first battery slice is provided with 83 or 84 first grid lines, and the back is provided with 90 or 91 second grid lines.
[0041] For example, assuming that the total number of first grid lines of a cell is 176 and the total number of second grid lines is 192, the front side of the first cell slice is provided with 83 first grid lines and the back side is provided with 90 second grid lines. Then the front side of the second cell slice should be provided with 93 first grid lines and the back side should be provided with 102 second grid lines.
[0042] In some embodiments, n=88, and the first grid line spacing on the front side of the solar cell is 1.2865 mm and 1.375 mm; wherein the spacing of 1.2865 mm and the spacing of 1.375 mm are arranged alternately.
[0043] In some embodiments, the second grid line spacing on the back side of the cell is 1.034 mm, h=96.
[0044] Specifically, when it is necessary to prepare the grid lines on the front side of the cell, the following method is used: Figure 1The laser printing template shown in the figure is used for processing. The total number of first grid lines is set to 2n=176, and the spacing between adjacent first grid lines is non-uniform, that is, the spacing of 1.2865 mm and the spacing of 1.375 mm are also arranged alternately. Generally, since the square resistance of the back of the battery cell is low, its back does not need to be laser processed. Therefore, the above-mentioned Figure 1 The laser printing template shown does not need to be modified. However, even if the back of the cell does not need to be laser processed, considering the conductivity of the cell, a total of 2h=192 second grid lines are still required on the back. Moreover, the spacing between adjacent second grid lines is designed to be equal, that is, the spacing between each second grid line is always equal to 1.034 mm.
[0045] For example, if n=88 and h=96, and the cell is cut along the second cutting line S 2 After cutting, the theoretical number of the first grid lines and the second grid lines of the first battery slice are approximately equal to 188n / 199=83.1 and 188h / 199=90.7, respectively, and the theoretical number of the first grid lines and the second grid lines of the second battery slice are approximately equal to 210n / 199=92.9 and 210h / 199=101.3, respectively. And considering that it is necessary to leave gaps for the grid lines at the edge of the battery slice in actual production, the maximum integer not greater than the theoretical number should be taken as the number of grid lines actually obtained by processing. Then, the number of grid lines of the first grid lines and the second grid lines of the first battery slice actually cut and formed can be 83 and 90, respectively, and the number of grid lines of the first grid lines and the second grid lines of the second battery slice can be 92 and 101, respectively. In addition, it should be noted that although it is known that the number of grid lines on the front of the battery slice before processing is 2n=176, which is an even number. However, in the actual cutting process, one of the first gate lines and the second gate line may be destroyed (for example, the laser is cutting directly towards the first gate line and the second gate line), resulting in the sum of the first gate lines of the first battery slice lines and the second battery slices actually cut to be 83+92=175, which becomes an odd number.
[0046] In summary, when it is necessary to prepare cell slices that match 199 modules, 188 modules or 210 modules, there is no need to design additional silicon wafer layouts. Only the same set of laser printing templates can be used to process the front of the cell, which realizes the compatible use of laser printing templates and avoids grid line printing errors caused by mixed use of templates. In addition, the dense grid line design on the front and back of the cell can improve the power generation efficiency of the prepared cell slice products.
[0047] In some embodiments, 16 columns of first main grids are arranged on the front of the cell; wherein, 10 wiring points are arranged on each column of main grids on the front of the cell. After the cell is cut, the cell slices obtained still retain corresponding wiring points, which can match the wiring points of 199 modules, 188 modules or 210 modules, thereby improving the assembly efficiency of the prepared cell slice products.
[0048] For example, the 16 main grids on the front and back sides of the cell are as follows: Figure 5 As shown, each main grid is perpendicular to each grid line. By using the battery cell with the above main grid structure, a battery slice with a 5PAD point design on the front and a 6PAD point design on the back can be prepared through laser cutting. Among them, the specific meaning of the 5PAD point design or the 6PAD point design is that 5 or 6 welding points are set on each main grid of the battery slice. Generally, welding points are set at the wiring points. The welding points are the points where the welding strips on the outside of the battery cell contact the battery slice. The welding points are used to transfer current to the welding strips. The design of the wiring point position is used to conduct the current collected from the battery slice through the welding strips.
[0049] In some embodiments, the spacing between two adjacent rows of wiring points on the front side of the battery cell is equal, and the spacing between two adjacent rows of wiring points on the back side of the battery cell is equal; each row of wiring points is parallel to the first lateral side.
[0050] In some embodiments, the two rows of connection points near the first lateral side and the second lateral side are 7.5 mm away from the first lateral side and the second lateral side, respectively, and the first cutting line S near the battery sheet is 5 mm away from the first lateral side and the second lateral side. 1 The two rows of wiring points are located at the first cutting line S 1 The distance between them is 7.5 mm; among them, the first lateral side with a length of 182 mm matches the circuit structure of 199 components, 188 components and 210 components, thereby improving the assembly efficiency of the prepared battery slice products.
[0051] For example, Figure 5 , 6 , 7, d 1 represents the distance between the first and last rows of wiring points and the first and second lateral sides of the two ends of the battery cell, as well as the distance between the two rows of wiring points near the symmetry line of the battery cell and the symmetry line, and d 1 =7.5 mm. d 2 Indicates the distance between any two adjacent rows of wiring points, d 2 The specific value of is uncertain and needs to be set by production personnel according to actual conditions. The variables that need to be considered generally include: whether the position is the front or back of the battery cell, whether symmetrical or asymmetrical cutting is required to process the battery cell, and d 3represents the spacing between any two adjacent columns of main grids, and d 3 The specific value of is uncertain and production personnel need to make adjustments based on the line distribution of 199 components, 188 components, and 210 components.
[0052] In some embodiments, on the front side of the battery cell, the size of the wiring point is 1.0-1.51*0.5-0.7 square millimeters.
[0053] Exemplarily, the size of the wiring points on the first lateral side and the second lateral side near the two ends of the battery cell is 1.51*0.7 square millimeters, with 16 in each row; the size of the remaining wiring points is 1.0*0.5 square millimeters, which is used to match the size of the wiring components of the 199 components, 188 components and 210 components, thereby improving the assembly efficiency of the prepared battery slice products.
[0054] In some embodiments, on the back side of the battery cell, the size of the wiring point is 0.8-1.32*0.4-0.6 square millimeters.
[0055] Exemplarily, the size of the wiring points at the first lateral side and the second lateral side near the two ends of the battery cell is 1.32*0.6 square millimeters, with 16 in each row; the size of the remaining wiring points is 0.8*0.4 square millimeters, which is used to match the size of the wiring components of the 199 components, 188 components and 210 components, thereby improving the assembly efficiency of the prepared battery slice products.
[0056] For example, Figure 8 The A region and the B region shown represent two different wiring points, namely the above-mentioned PAD points, which can be set at the gap between the first gate line and the second gate line of the battery cell.
[0057] By using the cell with the above-mentioned first grid line and second grid line, first main grid and second main grid, wiring point and wiring point structure, it is possible to prepare in batches cell slices that match the circuit structure of 199 modules, 188 modules and 210 modules, such as TOPCon cell slices. Moreover, during the processing, there is no need to change the overall size of the cell, reducing the cost disadvantage and time loss caused by the change of tooling and fixtures during cutting. In addition, when preparing the grid line, it is compatible with the same laser printing template, avoiding grid line printing errors caused by mixed templates and improving preparation efficiency.
[0058] It should be noted that in the traditional production method, in order to batch cut battery slices of different sizes, the sizes of the battery slices to be processed are different, resulting in the need to design multiple sets of laser printing templates of different sizes. Therefore, whenever the size of the battery slices to be produced is switched, the laser printing template needs to be switched to complete the grid line preparation of the laser printing template, which is easy to cause the accident of mixing the laser printing templates.
[0059] Therefore, the specific meaning of "compatible with the same laser printing template" in this case is that, in order to batch-cut battery slices of different sizes, if the battery slices described in this case are used as the original parts to be processed, there is no need to replace battery slices of different sizes during batch cutting. And when the number of first grid lines and second grid lines n and h on the front and back of the battery slice is determined, the same laser printing template can be used to laser process the front of the battery slice, and there is no need to adjust the template during processing.
[0060] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0061] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A battery cell, characterized in that: The size of the battery cell is 182*199 square millimeters. The front side of the battery cell is provided with 2n first grid lines with non-uniform spacing, and the back side of the battery cell is provided with 2h second grid lines with equal spacing. The first longitudinal side and the second longitudinal side of the battery cell are both 199 mm in size, the first transverse side and the second transverse side of the battery cell are both 182 mm in size, each of the first grid lines is parallel to the first transverse side, the spacing between the first grid lines is the longitudinal spacing between two adjacent first grid lines, and n and h are both positive integers; The front and back sides of the battery slice are also provided with a first cutting line and a second cutting line, and two symmetrical and interconnected battery slices are provided on both sides of the first cutting line, and the size of each battery slice is 182*99.5 square millimeters, and the front side of each battery slice is provided with n first grid lines, and the back side of each battery slice is provided with h second grid lines; Two asymmetrical and interconnected first battery slices and second battery slices are arranged on both sides of the second cutting line. The size of the first battery slice is 182*94 square millimeters, and the size of the second battery slice is 182*105 square millimeters.
2. The battery cell according to claim 1, characterized in that: The front of the first battery slice is provided with 83 or 84 first grid lines, and the back of the first battery slice is provided with 90 or 91 second grid lines; the front of the second battery slice is provided with 2n-83 or 2n-84 first grid lines, and the back of the second battery slice is provided with 2h-90 or 2h-91 second grid lines.
3. The battery cell according to claim 1, characterized in that: n=88, the first grid line spacing on the front side of the solar cell is 1.2865 mm and 1.375 mm; wherein the spacing of 1.2865 mm and the spacing of 1.375 mm are arranged alternately.
4. The battery cell according to claim 1, characterized in that: The second grid line spacing on the back side of the cell is 1.034 mm, h=96.
5. The battery cell according to claim 1, characterized in that: The front side of the battery cell is provided with 16 columns of first main grids, wherein each column of the first main grids on the front side of the battery cell is provided with 10 wiring points; and each of the first main grids is parallel to the first longitudinal side.
6. The battery cell according to claim 5, characterized in that: The back side of the solar cell is provided with 16 columns of second main grids, and each column of the second main grids on the back side of the solar cell is provided with 12 wiring points; each of the second main grids is parallel to the first longitudinal side.
7. The battery cell according to claim 6, characterized in that: The wiring points in two adjacent rows on the front side of the battery cell are spaced at equal intervals, and the wiring points in two adjacent rows on the back side of the battery cell are spaced at equal intervals; each row of wiring points is parallel to the first transverse side.
8. The battery cell according to claim 7, characterized in that: The two rows of wiring points close to the first lateral side and the second lateral side are 7.5 mm away from the first lateral side and the second lateral side respectively, and the two rows of wiring points close to the first cutting line of the battery cell are 7.5 mm away from the first cutting line.
9. The battery cell according to claim 6, characterized in that: On the front side of the battery cell, the size of the wiring point is 1.0-1.51*0.5-0.7 square millimeters.
10. The battery cell according to claim 6, characterized in that: On the back side of the battery cell, the size of the wiring point is 0.8-1.32*0.4-0.6 square millimeters.