Battery piece and photovoltaic module
By setting multiple gate lines on the cell to optimize their spacing and width, the thin layer resistance problems caused by uneven edge diffusion of the cell and uneven coating are solved, the photoelectric conversion efficiency and the performance of photovoltaic modules are improved, and the production cost is reduced.
Patent Information
- Application Number
- CN202323666410.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-29
AI Technical Summary
After the cell area is expanded, edge diffusion or uneven coating is prone to occur during the diffusion or coating process, resulting in large resistance of the thin layer, affecting the photoelectric conversion efficiency and the performance of photovoltaic modules.
A plurality of gate lines are arranged on both sides of the thickness direction of the cell, and the gate lines are arranged spaced in the first direction. The distance between two adjacent gate lines located in the middle is greater than the distance between two adjacent gate lines at the edge. , reduce the distance between two adjacent gate lines on the edge, and use a silver paste gate line, with a width of 20μm≤w≤25μm, a height equal, and the ratio of length to width is 1/N.
By reducing the thin layer resistance, the photoelectric conversion efficiency of the battery cell is improved, the service life of the battery cell is extended, the power and performance of photovoltaic modules are improved, and the production cost is reduced.
Smart Images
Figure CN222146245U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to a battery sheet and a photovoltaic assembly. Background Art
[0002] With the development of industry, industrialized photovoltaic power generation systems need to increase the area of cells in order to improve efficiency and reduce costs. However, due to the large area of cells, cells are prone to diffusion or uneven coating during the diffusion or coating process, which cannot avoid the problem of large sheet resistance and contact resistance caused by the diffusion or uneven coating at the edge of the cell. As a result, when the cells connected in series in the photovoltaic module are tested for EL, the edges of the cells usually become dark, affecting the photoelectric conversion of the cells. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cell that improves the photoelectric conversion efficiency of the battery cell, thereby improving the power and performance of the photovoltaic module.
[0004] Another object of the present invention is to provide a photovoltaic module using the above-mentioned solar cell.
[0005] The battery cell according to the first aspect of the utility model comprises: a main body; a plurality of grid lines, wherein the plurality of grid lines are arranged on at least one side surface of the main body in the thickness direction, the plurality of grid lines are arranged at intervals along a first direction, each of the grid lines extends along a second direction perpendicular to the first direction, and the distance between two adjacent grid lines located in the middle of the main body along the first direction is greater than the distance between two adjacent grid lines located at the edge of the main body along the first direction.
[0006] According to the battery cell of the utility model, the grid lines are simple to set and easy to arrange, which helps to improve the production efficiency of the battery cell. In addition, by setting the distance between two adjacent grid lines located in the middle of the body along the first direction to be greater than the distance between two adjacent grid lines located at the edge of the body along the first direction, the distance between two adjacent grid lines at the edge is reduced, reducing the lateral transmission loss caused by the large sheet resistance, thereby helping to improve the photoelectric conversion efficiency of the battery cell, facilitating the long-term normal use of the battery cell, and thus improving the power and performance of the photovoltaic module.
[0007] According to some embodiments of the present invention, the distance between two adjacent gate lines gradually decreases from the middle of the body along the first direction toward the edge of the body along the first direction; or, the distance between two adjacent gate lines first remains unchanged and then gradually decreases.
[0008] According to some embodiments of the present invention, the width of the gate line located in the middle of the body along the first direction is smaller than the width of the gate line located at the edge of the body along the first direction.
[0009] According to some embodiments of the present invention, the widths of the plurality of gate lines gradually increase from the middle of the body along the first direction toward the edge of the body along the first direction; or, the widths of the plurality of gate lines first remain unchanged and then gradually increase.
[0010] According to some embodiments of the present invention, the width of the gate line located at the edge of the body along the first direction is w, wherein w satisfies: 20 μm≤w≤25 μm.
[0011] According to some embodiments of the present invention, the heights of the plurality of grid lines are equal.
[0012] According to some embodiments of the present invention, the grid lines are silver paste grid lines.
[0013] According to some embodiments of the present invention, the length of the body is L, the width of the body is W, and L and W satisfy: W / L=1 / N, wherein N is a positive integer.
[0014] The photovoltaic assembly according to the second embodiment of the utility model includes the solar cell according to the first embodiment of the utility model.
[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0017] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model;
[0018] Figure 2 It is a schematic diagram of a battery cell according to another embodiment of the utility model.
[0019] Reference numerals:
[0020] 100. Battery cell;
[0021] 1. Ontology;
[0022] 2. Grid line. DETAILED DESCRIPTION
[0023] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1 and Figure 2 The solar cell 100 according to the first embodiment of the utility model is described. The solar cell 100 in the present application is described by taking the use in a photovoltaic module as an example.
[0024] like Figure 1 and Figure 2 As shown, the battery cell 100 according to the first embodiment of the utility model comprises a body 1 and a plurality of grid lines 2. In the description of the utility model, "plurality" means two or more than two.
[0025] Specifically, the plurality of grid lines 2 are disposed on at least one side surface of the body 1 in the thickness direction (ie, the up-down direction), and the plurality of grid lines 2 are disposed along a first direction (eg, Figure 1 The front-to-back direction) is arranged at intervals, and each grid line 2 is arranged along a second direction perpendicular to the first direction (for example, Figure 1 For example, Figure 1 In the example, a plurality of grid lines 2 are arranged on the upper side of the body 1, and the plurality of grid lines 2 are arranged at intervals along the front-to-back direction, and each grid line 2 extends along the left-right direction. Of course, a plurality of grid lines 2 can also be arranged on the lower side of the body 1, or the upper side and the lower side of the body 1 are provided with the same grid lines 2. With such a configuration, the grid lines 2 are simply arranged, which facilitates the arrangement of the plurality of grid lines 2, thereby helping to improve the production efficiency of the battery cell 100. It should be noted that the number and arrangement of the grid lines 2 can be specifically set according to actual use to better meet practical applications.
[0026] Combination Figure 1 , the distance between two adjacent grid lines 2 located in the middle of the body 1 along the first direction (i.e., the front-to-back direction) is greater than the distance between two adjacent grid lines 2 located at the edge of the body 1 along the first direction (i.e., the front-to-back direction). Figure 1 In the example, the distance between two adjacent grid lines 2 in the middle area of the battery cell 100 along the front-to-back direction is d1, and the distance between two adjacent grid lines 2 near the edge area of the battery cell 100 is d2, wherein d1>d2. During the production process of the battery cell 100, as the area of the battery cell 100 gradually increases, diffusion or uneven coating may occur at the edge of the battery cell 100, thereby making the sheet resistance at the edge of the battery cell 100 larger. The larger sheet resistance may lead to lateral transmission loss of the battery cell 100. With such a configuration, at the edge of the battery cell 100, the spacing between two adjacent grid lines 2 is smaller, thereby reducing the distance that electrons or holes move from the middle of two adjacent grid lines 2 on the surface of the battery cell 100 to the above-mentioned two grid lines 2 (such as Figure 2As shown by arrow A in the figure, it helps to reduce the lateral transmission loss caused by the large sheet resistance, thereby helping to improve the photoelectric conversion efficiency of the battery cell 100, which is beneficial to the long-term normal use of the battery cell 100 and improves the power and performance of the photovoltaic module.
[0027] According to the cell 100 of the utility model, the grid lines 2 are simply arranged and conveniently laid out, thereby helping to improve the production efficiency of the cell 100. In addition, by setting the distance between two adjacent grid lines 2 located in the middle of the body 1 along the first direction to be greater than the distance between two adjacent grid lines 2 located at the edge of the body 1 along the first direction, the distance between two adjacent grid lines 2 at the edge is reduced, thereby reducing the lateral transmission loss caused by the large sheet resistance, thereby helping to improve the photoelectric conversion efficiency of the cell 100, facilitating the long-term normal use of the cell 100, and thereby improving the power and performance of the photovoltaic module.
[0028] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , along the direction from the middle of the main body 1 along the first direction (i.e., the front-to-back direction) toward the edge of the main body 1 along the first direction (i.e., the front-to-back direction), the distance between two adjacent grid lines 2 gradually decreases; or, the distance between two adjacent grid lines 2 first remains unchanged and then gradually decreases.
[0029] For example, the arrangement of the gate lines 2 includes the following situations: first, the distance between two adjacent gate lines 2 gradually decreases from the middle of the body 1 along the first direction toward the edge of the body 1 along the first direction (eg Figure 2 For example, in Figure 2 In the example, the distance between two adjacent grid lines 2 in the middle area of the battery cell 100 along the front-to-back direction is d1, the distance between two adjacent grid lines 2 near the edge area of the battery cell 100 is d2, and the distance between the grid line 2 in the middle area of the battery cell 100 and the other adjacent grid lines between the grid line 2 in the edge area is d3, wherein d1>d3>d2. Second, along the direction from the middle of the body 1 along the first direction toward the edge of the body 1 along the first direction, the distance between two adjacent grid lines 2 first remains unchanged and then gradually decreases. Such a setting is conducive to arranging multiple grid lines 2 according to actual conditions, improves the flexibility and variability of the arrangement of multiple grid lines 2, and makes the multiple grid lines 2 on the battery cell 100 adjustable so as to better meet the use needs of customers. Moreover, the applicable scope of the battery cell 100 is also increased, thereby improving the use performance of the battery cell 100. In addition, the aesthetics of the battery cell 100 is also improved.
[0030] According to some embodiments of the present invention, referring to Figure 1, the width of the grid line 2 located in the middle of the body 1 along the first direction (ie, the front-to-back direction) (for example, Figure 1 The width w1 in the figure is smaller than the width of the gate line 2 located at the edge of the body 1 along the first direction (for example, Figure 1 For example, in Figure 1 In the example, the contact area between the grid line 2 and the body 1 in the middle area of the body 1 is greater than the contact area between the grid line 2 and the body 1 in the edge area of the body 1. As a result, the contact resistance of the edge area of the cell 100 can be made smaller than the contact resistance of the middle area of the cell 100, that is, the contact resistance of the edge area of the cell 100 is reduced, which is conducive to improving the photoelectric conversion efficiency of the cell 100, increasing the power generation of the cell 100, and then increasing the power generation of the photovoltaic module. In addition, the material consumption of the grid line 2 is reduced, thereby reducing the cost of the grid line 2 and reducing the production cost of the cell 100.
[0031] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , along the middle of the body 1 along the first direction (i.e., the front-to-back direction) toward the edge of the body 1 along the first direction, the width of the plurality of grid lines 2 gradually increases; or, the width of the plurality of grid lines 2 first remains unchanged and then gradually increases. For example, the width of the grid lines 2 may be set in the following cases: first, along the middle of the body 1 along the first direction toward the edge of the body 1 along the first direction, the width of the plurality of grid lines 2 gradually increases (e.g., Figure 1 For example, in Figure 1 In the example, the width of the grid line 2 located in the middle area of the battery cell 100 along the front-to-back direction is w1, the width of the grid line 2 near the edge area of the battery cell 100 is w, and the width of the other grid lines between the grid line 2 located in the middle area of the battery cell 100 and the grid line 2 located in the edge area is w3, wherein w>w3>w1. Second, along the direction from the middle of the body 1 along the first direction toward the edge of the body 1 along the first direction, the width of the plurality of grid lines 2 first remains unchanged and then gradually increases (such as Figure 2 As shown). With such a configuration, the width of the grid line 2 can be adjusted according to the contact resistance in the cell 100, thereby improving the flexibility of using the grid line 2 in the cell 100 and effectively ensuring that the contact area between the grid line 2 at the edge of the cell 100 and the body 1 is large, thereby reducing the contact resistance at the edge of the cell 100, and further improving the photoelectric conversion efficiency of the cell 100. In addition, the aesthetics of the cell 100 is also improved.
[0032] According to some embodiments of the present invention, referring to Figure 1, the width of the gate line 2 located at the edge of the main body 1 along the first direction (i.e., the front-to-back direction) is w, wherein w satisfies: 20μm≤w≤25μm. For example, when the width w of the gate line 2 located at the edge of the main body 1 along the first direction is less than 20μm, the width of the gate line 2 at the edge of the main body 1 is small, and the contact area between the gate line 2 at the edge of the main body 1 and the main body 1 is small, thereby increasing the contact resistance at the edge of the battery cell 100 and reducing the photoelectric conversion efficiency of the battery cell 100. For example, when the width w of the gate line 2 located at the edge of the main body 1 along the first direction is greater than 25μm, the width of the gate line 2 is large, thereby increasing the material usage of the gate line 2, increasing the production cost of the gate line 2, and further increasing the production cost of the battery cell 100. Thus, by setting the width w of the gate line 2 located at the edge of the body 1 along the first direction to satisfy 20μm≤w≤25μm, the width of the gate line 2 at the edge of the body 1 is reasonably set, which increases the contact area between the gate line 2 at the edge of the body 1 and the body 1, thereby reducing the contact resistance at the edge of the battery cell 100, thereby improving the photoelectric conversion efficiency of the battery cell 100, and improving the performance of the battery cell 100. In addition, the material consumption of the gate line 2 is reduced, thereby reducing the production cost of the gate line 2, and thereby reducing the production cost of the battery cell 100.
[0033] According to some embodiments of the present invention, referring to Figure 1 , the heights of the plurality of gate lines 2 (i.e., the lengths of the gate lines 2 in the direction perpendicular to the plane where the first direction and the second direction are located) are all equal. In this way, when the heights of the plurality of gate lines 2 remain unchanged, the width of the gate lines 2 at the edge of the body 1 is increased, and the cross-sectional area of the gate lines 2 at the edge of the body 1 is increased, thereby reducing the line resistance of the gate lines 2 at the edge of the body 1 (according to the formula R 线电阻 =ρ*h / S, wherein ρ is the resistivity of the grid line 2, h is the height of the grid line 2, and S is the cross-sectional area of the grid line 2), thereby further reducing the total resistance at the edge of the battery cell 100, which is beneficial to improving the darkening of the edge of the battery cell 100, thereby further improving the photoelectric conversion efficiency of the battery cell 100, and further improving the power of the photovoltaic module.
[0034] There are many reasons for the high edge resistance of the cell 100 during the production process, such as uneven plasma enhanced vapor deposition (PECVD) or physical vapor deposition (PVD) coating of the heterojunction cell (HJT cell), and the thickness of the film layer is thin due to the contact between the edge of the cell 100 and the carrier, so that the sheet resistance of the edge of the cell 100 is relatively large. As the area of the cell 100 gradually increases, the unevenness of the cell 100 is also increased, so that the resistance of the edge of the cell 100 is also large, and the edge of the cell 100 is dark. Therefore, by adopting the above-mentioned setting of multiple grid lines 2, the total resistance of the edge of the cell 100 can be effectively reduced, and the silver paste consumption can be effectively utilized. Under the premise of controlling the manufacturing cost of the cell 100, the darkening of the edge of the cell 100 is improved, thereby improving the photoelectric conversion efficiency of the cell 100 and the power of the photovoltaic module.
[0035] According to some embodiments of the utility model, the grid line 2 is a silver paste grid line 2. For example, the silver paste has good electrical conductivity, contact and fluidity, which is conducive to the contact between the grid line 2 and the body 1, improves the connection strength between the grid line 2 and the body 1, and also improves the electrical conductivity of the grid line 2, which is conducive to the transmission of electrons, thereby improving the photoelectric conversion efficiency of the battery cell 100. When the battery cell 100 is used in a photovoltaic module, the power of the photovoltaic module is improved, and the performance of the photovoltaic module is also improved.
[0036] According to some embodiments of the present invention, referring to Figure 1 , the length of the body 1 is L, the width of the body 1 is W, L, W satisfy: W / L=1 / N, where N is a positive integer. Figure 1 and Figure 2 The battery cell 100 shown in the figure may be a complete battery cell 100, or a half of the entire battery cell 100, or a fraction of the entire battery cell 100, so as to facilitate adjustment of the use of the battery cell 100. It should be noted that the size of the battery cell 100 can be specifically set according to actual use to better meet the actual application.
[0037] A photovoltaic assembly (not shown) according to an embodiment of the second aspect of the utility model comprises a solar cell 100 according to an embodiment of the first aspect of the utility model.
[0038] According to the photovoltaic module of the present invention, by adopting the above-mentioned battery sheet 100, the power of the photovoltaic module is improved, and the performance of the photovoltaic module is also improved.
[0039] Other structures and operations of the cell 100 and the photovoltaic module according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.
[0040] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", 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 this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.
[0042] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A battery cell, characterized in that: include: ontology; A plurality of gate lines are provided on at least one side surface of the body in the thickness direction, the plurality of gate lines are spaced apart along a first direction, each of the gate lines extends along a second direction perpendicular to the first direction, and a distance between two adjacent gate lines located in the middle of the body along the first direction is greater than a distance between two adjacent gate lines located at the edge of the body along the first direction.
2. The battery cell according to claim 1, characterized in that: Along from the middle of the body along the first direction toward the edge of the body along the first direction, The distance between two adjacent grid lines gradually decreases; or The distance between two adjacent grid lines first remains unchanged and then gradually decreases.
3. The battery cell according to claim 1, characterized in that: The width of the gate line located in the middle of the body along the first direction is smaller than the width of the gate line located at the edge of the body along the first direction.
4. The battery cell according to claim 3, characterized in that: Along from the middle of the body along the first direction toward the edge of the body along the first direction, The widths of the plurality of gate lines gradually increase; or The widths of the plurality of gate lines remain unchanged at first and then gradually increase.
5. The battery cell according to claim 3, characterized in that: The width of the gate line located at the edge of the body along the first direction is w, wherein w satisfies: 20 μm≤w≤25 μm.
6. The battery cell according to claim 1, characterized in that: The heights of the plurality of grid lines are all equal.
7. The battery cell according to claim 1, characterized in that: The grid lines are silver paste grid lines.
8. The battery cell according to any one of claims 1 to 7, characterized in that: The length of the body is L, the width of the body is W, and L and W satisfy: W / L=1 / N, where N is a positive integer.
9. A photovoltaic module, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 8.