Positive electrode screen structure and battery sheet
By designing a stepped main grid line structure on the positive electrode screen, the problems of high printing costs and easy grid line breakage caused by constant main grid line width were solved, resulting in improved battery efficiency and welding tensile strength, thus improving battery quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TRINA SOLAR CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-03
AI Technical Summary
The existing positive electrode screen design has a constant main grid line width, which leads to increased printing costs and low cell efficiency. Furthermore, the grid line structure is prone to breakage during module stringing, affecting cell quality.
A stepped main grid morphology design is adopted, which sets main grid segments with different line widths in the edge area and the middle area of the screen. The line width of the first and second main grid segments is greater than that of the third main grid segment, forming a stepped main grid line structure.
It reduces the power consumption of the main grid, improves battery efficiency, and enhances the welding tensile strength of the grid structure, thereby improving battery quality.
Smart Images
Figure CN224447160U_ABST
Abstract
Description
Technical Field
[0001] This utility model mainly relates to the field of photovoltaic cell printing technology, and in particular to a positive electrode screen structure and a battery cell. Background Technology
[0002] In existing positive electrode screen designs, the linewidth of the main grid lines is designed to be a constant value, which cannot adequately address printing details. If this constant value is too large, it will not only increase printing costs but also affect cell efficiency. However, if the constant value is too small, the grid line structure printed on the cell surface is prone to breakage during module stringing, affecting cell quality. Utility Model Content
[0003] The purpose of this invention is to provide a positive electrode grid structure and a battery cell, which reduces the main grid single loss and improves battery efficiency by using a stepped main grid morphology, while also improving the welding tensile strength of the formed grid structure, thereby improving battery quality.
[0004] In a first aspect, this application provides a positive electrode screen printing structure, including multiple parallel main grid lines; wherein each main grid line includes a first main grid segment located in the edge region of the screen printing, a second main grid segment located in the middle region of the screen printing, and a third main grid segment connected between the first main grid segment and the second main grid segment, wherein the edge region of the screen printing and the middle region of the screen printing do not intersect, the linewidth of the first main grid segment is greater than the linewidth of the third main grid segment, and the linewidth of the second main grid segment is greater than the linewidth of the third main grid segment.
[0005] In some embodiments, the linewidths of the first main gate segment and the second main gate segment are both x1, and the linewidth of the third main gate segment is x2, wherein x1 ≥ 30 μm, and 10 μm ≤ x2 ≤ 20 μm.
[0006] In some embodiments, the middle area of the screen printing plate is provided with PAD points, and the PAD points are connected to two second main grid segments on both sides along the length direction of the main grid.
[0007] In some embodiments, the height of the first main gate segment and the height of the second main gate segment are the same, and the length of the first main gate segment and the second main gate segment are the same.
[0008] In some embodiments, the height of the first main gate segment and the second main gate segment is 3um-6um, and the length of the first main gate segment and the second main gate segment is 50um-70um.
[0009] In some embodiments, the third main gate segment includes an edge sub-gate segment and a middle sub-gate segment. The edge sub-gate segment is connected to the first main gate segment and the second main gate segment, respectively. The middle sub-gate segment is connected between the edge sub-gate segments. The linewidth of the edge sub-gate segment is x3, and the linewidth of the middle sub-gate segment is x4, where 10um≤x4<x3≤20um.
[0010] In some embodiments, the height of the edge sub-gate segment is 2um-5um, and the length of the edge sub-gate segment is 40um-60um.
[0011] In some embodiments, the height of the intermediate sub-gate segment is 1µm-4µm, and the length of the intermediate sub-gate segment is 20µm-50µm.
[0012] In some embodiments, a section of the first main grid segment near the edge of the screen is provided with a harpoon structure.
[0013] In a second aspect, this application provides a battery cell including a positive electrode, the surface of which is provided with a grid structure formed according to the positive electrode screen structure described in any one of the first aspects.
[0014] Compared with the prior art, the present invention has the following advantages:
[0015] The positive electrode screen structure provided by this utility model includes multiple parallel main grid lines; wherein each main grid line includes a first main grid segment located in the edge region of the screen, a second main grid segment located in the middle region of the screen, and a third main grid segment connected between the first and second main grid segments. The edge region and the middle region of the screen do not intersect. The line width of the first main grid segment is greater than that of the third main grid segment, and the line width of the second main grid segment is greater than that of the third main grid segment.
[0016] The battery cell provided by this utility model includes a positive electrode, and the surface of the positive electrode is provided with a grid structure formed according to the positive electrode screen structure mentioned above.
[0017] In this way, the stepped grid design can reduce grid power consumption and improve battery efficiency, while also improving the welding tensile strength of the grid structure and thus improving battery quality. Attached Figure Description
[0018] The accompanying drawings are included to provide a further understanding of this application; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of this application and, together with this specification, serve to explain the principles of this application. In the drawings:
[0019] Figure 1 This is a schematic diagram of a positive electrode screen structure provided by this utility model;
[0020] Figure 2 This is a schematic diagram of the same main grid line on the positive electrode screen structure. Detailed Implementation
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.
[0022] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0023] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0024] Reference Figure 1 This illustration shows a positive electrode screen printing structure 1 provided in this embodiment. The positive electrode screen printing structure 1 includes multiple parallel main grid lines 2. The x-direction indicates the length direction of the positive electrode screen printing structure 1, and the y-direction indicates the width direction. In the x-direction, the multiple main grid lines 2 are parallel to each other, and the length direction of the main grid lines is consistent with the y-direction. The spacing between adjacent main grid lines 2 can be the same or different.
[0025] Continue to refer to Figure 1 Taking the main grid line 2 located on the right edge of the positive electrode screen structure 1 as an example, the same main grid line 2 includes a first main grid segment 21 located in the edge region 11 of the screen, a second main grid segment 22 located in the middle region 12 of the screen, and a third main grid segment 23 connecting the first and second main grid segments. The edge region 11 and the middle region 12 of the screen do not intersect. It should be understood that... Figure 1 The dividing points between the first main grid segment 21, the second main grid segment 22 and the third main grid segment 23 are only for easy distinction and do not mean that the same main grid line 2 itself is discontinuous.
[0026] The linewidth of the first main gate segment 21 is greater than the linewidth of the third main gate segment 23, and the linewidth of the second main gate segment 22 is greater than the linewidth of the third main gate segment 23.
[0027] The advantage of the positive electrode screen structure 1 provided in this embodiment is that, by having a linewidth greater than that of the first main grid segment 21 than that of the third main grid segment 23, and a linewidth greater than that of the second main grid segment 22 than that of the third main grid segment 23, a stepped main grid morphology is formed on the surface of the positive electrode screen structure 1. This reduces the amount of printing paste in the middle area of the screen, thereby reducing the main grid consumption and improving battery efficiency. Furthermore, after printing the paste, the linewidths at both ends of the grid structure are wider, which can improve welding tensile strength and thus improve battery quality.
[0028] In some embodiments, the linewidth of the first main gate segment 21 and the second main gate segment 22 is x1, and the linewidth of the third main gate segment is x2, wherein x1≥30um, 10um≤x2≤20um.
[0029] Continue to refer to Figure 1 In some embodiments, a PAD point 24 is provided in the middle area of the screen, and the PAD point 24 is connected to two second main grid segments 22 on both sides along the length direction (y direction) of the main grid. A harpoon structure 25 is provided in the section of the first main grid segment 21 near the edge of the screen.
[0030] In some embodiments, the height of the first main gate segment 21 is the same as the height of the second main gate segment 22, and the length of the first main gate segment 21 and the second main gate segment 22 is the same.
[0031] In some embodiments, the height of the first main gate segment 21 and the second main gate segment 22 is 3um-6um, and the length of the first main gate segment 21 and the second main gate segment 22 is 50um-70um.
[0032] In this embodiment, the linewidth of the first main gate segment 21 and the linewidth of the second main gate segment 22 are both 30µm, the height is 3µm and the length is 50µm.
[0033] Reference Figure 2This diagram illustrates the structure of a third main gate segment 23 provided in this embodiment. Figure 2 In some embodiments, the third main gate segment 23 includes an edge sub-gate segment 231 and a middle sub-gate segment 232. The edge sub-gate segment 231 is connected to the first main gate segment 21 and the second main gate segment 22, respectively. The middle sub-gate segment 232 is connected between the edge sub-gate segments 231. The linewidth of the edge sub-gate segment 231 is x3, and the linewidth of the middle sub-gate segment is x4, where 10um≤x4<x3≤20um.
[0034] For example, in this embodiment, two edge sub-gate segments 231 are respectively connected to the lower part of the first main gate segment 21 and the upper part of the second main gate segment 22, and the linewidth of both edge sub-gate segments 231 is 20µm. The lower part of one edge sub-gate segment 231 is connected to the upper part of an intermediate sub-gate segment 232, and the upper part of the other edge sub-gate segment 231 is connected to the lower part of another intermediate sub-gate segment 232. The linewidth of both intermediate sub-gate segments 232 is 10µm.
[0035] In this embodiment, the linewidth of the same main grid line 2 changes in a stepped manner from the lower edge of the positive electrode screen structure 1 toward the center, successively: 30µm, 20µm, 10µm, 10µm, 20µm, 30µm. Since the positive electrode screen structure 1 is symmetrical vertically, the linewidth of the main grid line 2 also changes in the same stepped manner from the upper edge of the positive electrode screen structure 1 toward the center, successively: 30µm, 20µm, 10µm, 10µm, 20µm, 30µm. This reduces the main grid power consumption, improves battery efficiency, and also improves welding pull strength, thereby enhancing battery quality.
[0036] In some embodiments, the height of the edge sub-gate segment 231 is 2um-5um, and the length of the edge sub-gate segment 231 is 40um-60um.
[0037] In some embodiments, the height of the intermediate sub-gate segment 232 is 1um-4um, and the length of the intermediate sub-gate segment 232 is 20um-50um.
[0038] In this embodiment, the height of the first main grid segment 21 is 3 μm, the height of the edge sub-grid segment 231 is 2 μm, the height of the middle sub-grid segment 232 is 1 μm, and the height of the second main grid segment 22 is 3 μm. Thus, from the lower edge of the positive electrode screen structure 1 towards the center, the height of the same main grid line 2 also changes in a stepped manner, successively: 3 μm, 2 μm, 1 μm, 1 μm, 2 μm, 3 μm. Since the positive electrode screen structure 1 is symmetrical vertically, from the upper edge of the positive electrode screen structure 1 towards the center, the height of the main grid line 2 also changes in the same stepped manner, successively: 3 μm, 2 μm, 1 μm, 1 μm, 2 μm, 3 μm. Therefore, after printing the paste, the height morphology of the resulting grid line structure is distributed in a stepped manner, gradually decreasing from the edge to the center. This can reduce the main grid unit consumption, improve battery efficiency, and improve welding pull strength, thereby improving battery quality.
[0039] This utility model also provides a battery cell, including a positive electrode, the surface of which is provided with a grid structure formed according to the positive electrode screen structure 1 described above. The grid structure includes structures corresponding to the first main grid segment 21, the second main grid segment 22, and the third main grid segment 23 described above, for details please refer to... Figure 1 , Figure 2 As shown, it will not be elaborated further here.
[0040] In this embodiment, since the surface of the positive electrode of the battery cell has a grid line structure formed according to the positive electrode screen structure 1 as described above, the main grid loss can be reduced and the battery efficiency can be improved by the stepped main grid morphology on its surface. Furthermore, since the line width at both ends of the grid line structure is relatively wide, the welding pull can be improved, thereby improving the battery quality.
[0041] In summary, this utility model forms a stepped main grid line design by making the line width of the first main grid segment greater than that of the third main grid segment, and the line width of the second main grid segment greater than that of the third main grid segment. On the one hand, it can reduce the main grid unit consumption and improve battery efficiency; on the other hand, it can improve the welding tensile strength of the formed grid line structure, thereby improving battery quality.
[0042] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure of the utility model is merely an example and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore, such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.
[0043] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.
[0044] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values are set as precisely as feasible.
[0045] Although this application has been described with reference to specific embodiments, those skilled in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, any changes or modifications to the above embodiments within the essential spirit of this application will fall within the scope of the claims of this application.
Claims
1. A positive electrode screen structure, characterized by, It includes multiple parallel main grid lines; wherein each main grid line includes a first main grid segment located in the edge region of the screen, a second main grid segment located in the middle region of the screen, and a third main grid segment connecting the first main grid segment and the second main grid segment. The edge region of the screen and the middle region of the screen do not intersect. The line width of the first main grid segment is greater than the line width of the third main grid segment, and the line width of the second main grid segment is greater than the line width of the third main grid segment.
2. The positive electrode screen structure of claim 1, wherein, The linewidths of the first main gate segment and the second main gate segment are both x1, and the linewidth of the third main gate segment is x2, wherein x1≥30um and 10um≤x2≤20um.
3. The positive electrode screen structure of claim 2, wherein The screen printing plate has PAD points in the middle area, and the PAD points are connected to two second main grid segments on both sides along the length of the main grid.
4. The positive electrode screen structure according to any one of claims 1 to 3, wherein The height of the first main gate segment is the same as the height of the second main gate segment, and the length of the first main gate segment is the same as that of the second main gate segment.
5. The positive electrode screen structure of claim 4, wherein, The height of the first main gate segment and the second main gate segment is 3um-6um, and the length of the first main gate segment and the second main gate segment is 50um-70um.
6. The positive electrode screen structure of any one of claims 1-3, wherein, The third main gate segment includes an edge sub-gate segment and a middle sub-gate segment. The edge sub-gate segment is connected to the first main gate segment and the second main gate segment respectively. The middle sub-gate segment is connected between the edge sub-gate segments. The linewidth of the edge sub-gate segment is x3, and the linewidth of the middle sub-gate segment is x4, where 10um≤x4<x3≤20um.
7. The positive electrode screen structure of claim 6, wherein The height of the edge sub-gate segment is 2um-5um, and the length of the edge sub-gate segment is 40um-60um.
8. The positive electrode screen structure of claim 6, wherein, The height of the intermediate sub-gate segment is 1um-4um, and the length of the intermediate sub-gate segment is 20um-50um.
9. The positive electrode screen structure of claim 1, wherein, The first main grid section near the edge of the screen is equipped with a harpoon structure.
10. A battery sheet, characterized by It includes a positive electrode, the surface of which is provided with a grid line structure formed by the positive electrode screen structure according to any one of claims 1-9.