Battery grid line structure and solar battery

Abstract

The utility model discloses a cell grid line structure and a solar cell. The battery grid line structure comprises a main grid line and thin grid lines, the main grid line comprises a plurality of adjacent main grid convex parts, at least two of the main grid convex parts are different in height, the adjacent main grid convex parts are different in height, and the height of each main grid convex part is larger than the width of the main grid convex part; and / or the thin grid line comprises a plurality of adjacent thin grid convex parts, at least two thin grid convex parts in the plurality of thin grid convex parts are different in height, the adjacent thin grid convex parts are different in height, and the height of each thin grid convex part is greater than the width of the thin grid convex part. Through the specific grid line structural design, the main grid lines and / or the thin grid lines are provided with the convex parts with different heights, and the convex parts with different heights increase the reflection of incident light, so that the effective utilization of the incident light by the cell is increased, and the efficiency of the cell is improved.

Description

Technical Field

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

[0002] Currently, in solar cells, the front-side grid lines can cause some light shading, reducing the effective absorption of light. To mitigate this loss, current technology reduces the width of the front-side grid lines. However, reducing the grid line width increases the resistance of the silver grid lines. To overcome this problem, the electrode height is increased. By reducing the grid line width and increasing the grid line height, shading and resistance losses can be reduced. However, both methods place high demands on the grid line forming technology, which traditional grid line forming techniques cannot meet. Utility Model Content

[0003] Therefore, it is necessary to provide a battery grid structure. The battery grid structure of this invention, by designing the morphology of local locations of the grid lines, achieves the goal of reducing partial light shading loss by the grid lines without reducing the grid line width, thereby improving the efficiency of the solar cell. Using the battery grid structure of this application, there is no need to increase the grid line height, and no need for the complex fabrication process of grid lines in traditional technologies, thus saving process costs.

[0004] One embodiment of this application provides a battery grid structure.

[0005] A battery grid structure includes main grid lines and fine grid lines, wherein the battery grid structure satisfies at least one of the following conditions (1) and (2):

[0006] (1) The main grid line includes a plurality of adjacent main grid protrusions, at least two of the plurality of main grid protrusions have different heights, and the height of each main grid protrusion is greater than the width of the main grid protrusion;

[0007] (2) The fine grid line includes a plurality of adjacent fine grid protrusions, at least two of the fine grid protrusions have different heights, and the height of each fine grid protrusion is greater than the width of the fine grid protrusion.

[0008] In some embodiments, the sum of the heights of the individual main gate protrusions in the main gate line is H1+H2+...+H N With the width W of the main gate line 主 The following relationship exists between them: H1 + H2 + ... + H N ≥2W 主 , where N is the number of the main gate protrusions.

[0009] In some embodiments, the height H of each of the main gate protrusions in the main gate line is...i The maximum half-width W of the main gate protrusion i The following relationship must be satisfied: arctan(H) i / W i The angle is between 25° and 75°, where 1 ≤ i ≤ N.

[0010] In some embodiments, the height of the main gate protrusion with the maximum height in the main gate line is 4μm to 15μm.

[0011] In some embodiments, the width of the main gate protrusion with the maximum height in the main gate line is 3μm to 15μm.

[0012] In some embodiments, the height of the main gate protrusion with the minimum height in the main gate line is 3μm to 10μm.

[0013] In some embodiments, the width of the main gate protrusion with the minimum height in the main gate line is 1μm to 10μm.

[0014] In some embodiments, the height of each of the main gate protrusions in the main gate line is different; the height of the main gate protrusions decreases sequentially along the direction from the middle position of the main gate line to its two side edges.

[0015] In some embodiments, the height of the non-maximum height main gate protrusion is 60% to 85% of the height of the maximum height main gate protrusion.

[0016] In some embodiments, the sum of the heights of the individual fine gate protrusions in the fine gate line is equal to the width W of the fine gate line. 副 The following relationship is satisfied between them: H1 ’ +H2 ’ +...+H N ’ ≥2W 副 , where N ’ The number of the fine grid protrusions.

[0017] In some embodiments, the height H of each of the fine gate protrusions in the fine gate line is... i ’ The maximum half-width W of the fine grating protrusion i ’ The following relationship must be satisfied: arctan(H) i ’ / W i ’ The angle is between 45° and 85°, where 1 ≤ i ’ ≤N ’ .

[0018] In some embodiments, the height of the fine gate protrusion with the maximum height is 4μm to 15μm.

[0019] In some embodiments, the width of the fine gate protrusion with the maximum height in the fine gate line is 3μm to 15μm.

[0020] In some embodiments, the minimum height of the fine gate protrusion in the fine gate line is 3μm to 15μm.

[0021] In some embodiments, the width of the smallest height of the fine gate protrusion in the fine gate line is 1 μm to 14 μm.

[0022] In some embodiments, the height of each of the fine grid protrusions in the fine grid line is different, and the height of the fine grid protrusions decreases sequentially along the direction from the middle position of the fine grid line to its two side edges.

[0023] In some embodiments, the height of the non-maximum height fine gate protrusion is 60% to 85% of the height of the maximum height fine gate protrusion.

[0024] An embodiment of this application also provides a solar cell.

[0025] A solar cell includes a cell body and a cell grid structure as described in any of the above embodiments, wherein the cell grid structure is connected to the cell body and is used to collect and guide the current generated by the cell body.

[0026] The aforementioned battery grid structure, through a specific grid structure design, incorporates protrusions of varying heights on the main grid lines and / or fine grid lines. These protrusions increase the reflection of incident light, primarily at the positions of the main grid lines and fine grid lines. Compared to the light obstruction at the locations of the main grid lines and fine grid lines in conventional technologies, the protrusions in this application increase light reflection. This reflected light reaches the light-receiving surface of the solar cell, thereby increasing the effective utilization of incident light and improving cell efficiency. Furthermore, the battery grid structure of this application eliminates the need to increase the grid line height and avoids the complex fabrication processes required in conventional technologies, thus saving on process costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0029] Figure 1 This is a schematic diagram of the main grid line structure of the battery grid line structure according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the main grid line structure according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the fine grid line structure according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures

[0033] 100, Main grid line; 101, Main grid protrusion; 200, Fine grid line; 201, Fine grid protrusion. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] In this document, "optionally," "optionally," and "optional" mean that something is optional, that is, it is selected from either "with" or "without." If multiple "options" appear in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "option" is independent. In this application, descriptions such as "optionally contains" and "optionally includes" indicate "contains or does not contain."

[0041] In this application, "light-receiving surface or front side" and "backlighting surface or back side" are used only to distinguish the positions of the two opposing surfaces of the battery substrate. In actual operating conditions, the "light-receiving surface" is the surface of the battery substrate that primarily receives light, but the "backlighting surface" does not necessarily not receive light. In fact, due to the presence of diffuse reflection, the "backlighting surface" can also receive light in actual operating conditions.

[0042] In this application, when numerical intervals (i.e., numerical ranges) are mentioned, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.

[0043] This application provides a battery grid structure to solve at least one of the following technical problems in the prior art: (1) the front grid lines in a solar cell have a certain degree of light shading, resulting in low battery efficiency; (2) in order to reduce light shading on the front grid lines of a solar cell, increasing the electrode height and reducing the grid line width to reduce shading loss and resistance loss requires high grid line forming technology, which is currently difficult to meet. The battery grid structure will be described below with reference to the accompanying drawings.

[0044] The battery grid structure provided in this application embodiment is exemplary; please refer to [link to example]. Figure 1 As shown, Figure 1 This is a schematic diagram of the main grid structure of the battery grid structure provided in an embodiment of this application. The battery grid structure of this application can be used to fabricate solar cells, and the efficiency of the fabricated solar cells can be improved.

[0045] To more clearly illustrate the structure of the battery grid line, the following description will be provided in conjunction with the accompanying drawings.

[0046] For example, please refer to Figure 1 As shown, Figure 1 This is a schematic diagram of the main grid structure of the battery grid structure provided in an embodiment of this application.

[0047] A battery grid structure includes main grid lines 100 and fine grid lines 200. The battery grid structure satisfies at least one of the following conditions (1) and (2):

[0048] (1) The main grid line 100 includes a plurality of adjacent main grid protrusions 101. At least two of the plurality of main grid protrusions 101 have different heights, and the height of each main grid protrusion 101 is greater than the width of the main grid protrusion 101.

[0049] (2) The fine grid line 200 includes a plurality of adjacent fine grid protrusions 201. At least two of the fine grid protrusions 201 have different heights, and the height of each fine grid protrusion 201 is greater than its width. It should be noted that the height mentioned above refers to the distance from the vertex of each protrusion to its bottom surface, that is, the distance perpendicular to the light-receiving surface of the solar cell. The width mentioned above refers to the maximum distance of each protrusion along the light-receiving surface of the solar cell. Since the main grid line 100 and the fine grid line 200 are generally similar to a tower structure during the formation process, the maximum distance mentioned above is generally the width of the bottom surface of the grid line.

[0050] It should be noted that, in one embodiment of this application, the main grid line 100 of the battery grid structure can adopt the above-described structural configuration, while the fine grid line 200 can adopt a structural configuration including but not limited to (2) above, that is, the fine grid line 200 can adopt other forms that do not include the fine grid protrusion 201. Similarly, in another embodiment of this application, the fine grid line 200 of the battery grid structure can adopt the above-described structural configuration, while the main grid line 100 can adopt a structural configuration including but not limited to (1) above, that is, the main grid line 100 can adopt other forms that do not include the main grid protrusion 101. Preferably, in another embodiment of this application, the main grid line 100 and the fine grid line 200 of the battery grid structure adopt the structural configurations in (1) and (2) above, respectively.

[0051] In the aforementioned battery grid structure, the main grid line 100, by providing several adjacent main grid protrusions 101, can achieve reflection of incident light on the surface of the main grid protrusions 101 with a relatively large height. At least part of the reflected light can reach the light-receiving surface of the solar cell. This utilizes the reflected light from the main grid line 100 region, increasing the amount of light absorbed by the light-receiving surface and improving battery efficiency. Compared to the shading effect of the main grid line 100 in conventional technology, this application significantly increases the light absorption through the main grid line 100. Similarly, the fine grid line 200, by providing several adjacent fine grid protrusions 201, can achieve reflection of incident light on the surface of the fine grid protrusions 201 with a relatively large height. At least part of the reflected light can reach the light-receiving surface of the solar cell. This utilizes the reflected light from the fine grid line 200 region, increasing the amount of light absorbed by the light-receiving surface and improving battery efficiency. Compared to the shading effect of the fine grid line 200 in conventional technology, this application significantly increases the light absorption through the fine grid line 200.

[0052] In some embodiments, at least one set of adjacent main gate protrusions 101 in the main gate line 100 have different heights.

[0053] In some embodiments, at least one set of adjacent fine gate protrusions 201 in the fine gate line 200 have different heights.

[0054] In some embodiments, the sum of the heights of the individual main gate protrusions 101 in the main gate line 100 is H1 + H2 + ... + H N Width W of main gate line 100 主 The following relationship exists between them: H1 + H2 + ... + H N ≥2W 主 Among them, H1, H2...H N It represents the height from the first main gate protrusion 101 to the Nth main gate protrusion 101, where N is the number of main gate protrusions 101, and N≥2.

[0055] In some embodiments, the height H of each main gate protrusion 101 in the main gate line 100 is... i The maximum half-width W of the main gate protrusion 101 i The following relationship must be satisfied: arctan(H) i / W i The angle is between 25° and 75°, where 1 ≤ i ≤ N, and W i This represents the maximum width of any one of the main grid protrusions 101. The maximum width refers to the longest width of the main grid protrusion 101 along the direction of the light-receiving surface of the solar cell. For example, see... Figure 2 As shown, Figure 2This is a schematic diagram of the main gate line structure according to an embodiment of the present invention. Arctan(H1 / W1) is between 25° and 75°, and arctan(H2 / W2) is also between 25° and 75°. It should be noted that, since some adjacent main gate protrusions 101 overlap, taking the outermost main gate protrusion 101 as an example, the maximum half-width W of the main gate protrusion 101... i This refers to the vertical distance between the central axis where the vertex of the main grid protrusion 101 is located and the bottom point of its contact battery body surface.

[0056] In some embodiments, the height of the main gate protrusion 101 with the maximum height in the main gate line 100 is 4μm to 15μm. The value of the height of the main gate protrusion 101 with the maximum height in the main gate line 100 includes, but is not limited to: 4μm, 5μm, 6μm, 8μm, 10μm, 12μm, 13μm, 14μm, 15μm or any range between the foregoing.

[0057] In some embodiments, the width of the main gate protrusion 101 with the maximum height in the main gate line 100 is 3μm to 15μm. The width of the main gate protrusion 101 with the maximum height in the main gate line 100 includes, but is not limited to: 5μm, 6μm, 8μm, 10μm, 12μm, 13μm, 14μm, 15μm, or any range between the foregoing.

[0058] In some embodiments, the height of the minimum height main gate protrusion 101 in the main gate line 100 is 3μm to 10μm. The width of the minimum height main gate protrusion 101 in the main gate line 100 includes, but is not limited to, 5μm, 6μm, 8μm, 10μm or any range between the two mentioned above.

[0059] In some embodiments, the width of the minimum height main gate protrusion 101 in the main gate line 100 is 1μm to 10μm. The width of the minimum height main gate protrusion 101 in the main gate line 100 includes, but is not limited to: 1μm, 3μm, 5μm, 6μm, 8μm, 10μm or any range between the foregoing.

[0060] In some embodiments, the height of each main gate protrusion 101 in the main gate line 100 is different. In order to ensure that the main gate protrusions 101 of different heights can reflect a certain amount of light, the height of the main gate protrusions 101 is distributed in a regular pattern that decreases sequentially from the middle position to the two side edges of the main gate line 100. This ensures that the main gate protrusions 101 of different heights can reflect a certain amount of light onto the light-receiving surface.

[0061] In some embodiments, the height of the non-maximum height main gate protrusion 101 is 60% to 85% of the height of the maximum height main gate protrusion 101. It should be noted that when the height of the main gate protrusions 101 decreases sequentially along the direction from the middle to the two side edges of the main gate line 100, the height of the next smaller height main gate protrusion 101 is 60% to 85% of the height of the adjacent previous larger main gate protrusion 101. For example, when there are two main gate protrusions 101, the height of the lower height main gate protrusion 101 is 60% to 85% of the height of the higher height main gate protrusion 101; for example, the height of the lower height main gate protrusion 101 is 60%, 65%, 70%, 75%, 80%, 85%, or other proportions of the height of the higher main gate protrusion 101. It should be noted that the ratio between the height of the lower main grid protrusion 101 and the height of the higher main grid protrusion 101 should not be too large. When the ratio is too large, the light reflected from the surface of the higher main grid protrusion 101 will not reach the light-receiving surface of the solar cell, but will be blocked by the lower main grid protrusion 101. Conversely, the ratio between the height of the lower and higher main grid protrusions 101 should not be too small. When the ratio is too small, the surface of the lower main grid protrusion 101 will reflect less light, failing to maximize the reflected light reaching the light-receiving surface of the solar cell, thus hindering the effective improvement of solar cell efficiency.

[0062] In some embodiments, the sum of the heights of the individual fine gate protrusions 201 in the fine gate line 200 is H1 + H2 + ... + H N With the width W of the fine gate line 200 副 The following relationship is satisfied between them: H1 ’ +H2 ’ +...+H N ’ ≥2W 副 H1 ’ H2 ’ ...H N ’ This represents the height from the first fine gate protrusion 201 to the Nth fine gate protrusion 201, where N is the height of the protrusion. ’ N represents the number of fine gate protrusions 201. ’ ≥2.

[0063] In some embodiments, the height H of each fine gate protrusion 201 in the fine gate line 200 is... i ’ The maximum half-width W of the fine grille protrusion 201 i ’The following relationship must be satisfied: arctan(H) i ’ / W i ’ The angle is between 45° and 85°, where 1 ≤ i ’ ≤N ’ W i ’ This represents the maximum width of any one of the fine grid protrusions 201. The maximum width refers to the longest width of that fine grid protrusion 201 along the direction of the light-receiving surface of the solar cell. For example, see... Figure 3 As shown, Figure 3 This is a schematic diagram of a fine grid line structure according to an embodiment of the present invention, arctan(H1) ’ / W1 ’ Between 45° and 85°, arctan(H2) ’ / W2 ’ The angle is between 45° and 85°. It should be noted that, since some adjacent fine gate protrusions 201 overlap, taking the outermost fine gate protrusion 201 as an example, the maximum half-width W of the fine gate protrusion 201... i ’ This refers to the vertical distance between the central axis where the vertex of the fine grid protrusion 201 is located and the bottom point of its contact battery body surface.

[0064] In some embodiments, the height of the fine gate protrusion 201 with the maximum height in the fine gate line 200 is 4 μm to 15 μm. The height of the fine gate protrusion 201 with the maximum height in the fine gate line 200 includes, but is not limited to: 4 μm, 5 μm, 6 μm, 8 μm, 10 μm, 12 μm, 13 μm, 14 μm, 15 μm, or any range between the foregoing.

[0065] In some embodiments, the width of the fine gate protrusion 201 with the maximum height in the fine gate line 200 is 3μm to 15μm. The width of the fine gate protrusion 201 with the maximum height in the fine gate line 200 includes, but is not limited to: 3μm, 4μm, 5μm, 6μm, 8μm, 10μm, 12μm, 13μm, 14μm, 15μm, or a range between any two of the foregoing.

[0066] In some embodiments, the height of the minimum height fine gate protrusion 201 in the fine gate line 200 is 3μm to 15μm. The height of the minimum height fine gate protrusion 201 in the fine gate line 200 includes, but is not limited to: 3μm, 4μm, 5μm, 6μm, 8μm, 10μm, 12μm, 13μm, 14μm, 15μm, or any range between the foregoing.

[0067] In some embodiments, the width of the smallest height fine gate protrusion 201 in the fine gate line 200 is 1 μm to 14 μm. The width of the smallest height fine gate protrusion 201 in the fine gate line 200 includes, but is not limited to: 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 8 μm, 10 μm, 12 μm, 13 μm, 14 μm or any range between the foregoing.

[0068] In some embodiments, the height of each fine gate protrusion 201 in the fine gate line 200 is different. In order to ensure that each fine gate protrusion 201 of different heights can reflect a certain amount of light, the height of the fine gate protrusions 201 is distributed in a regular pattern that decreases sequentially from the middle position to the two side edges of the fine gate line 200. This ensures that each fine gate protrusion 201 of different heights can reflect a certain amount of light onto the light-receiving surface.

[0069] In some embodiments, the height of the non-maximum height fine gate protrusion 201 is 60% to 85% of the height of the maximum height fine gate protrusion 201. It should be noted that when the height of the fine gate protrusions 201 decreases sequentially along the direction from the middle to the two side edges of the fine gate line 200, the height of the next smaller height fine gate protrusion 201 is 60% to 85% of the height of the adjacent previous larger fine gate protrusion 201. For example, when there are two fine gate protrusions 201, the height of the lower height fine gate protrusion 201 is 60% to 85% of the height of the higher fine gate protrusion 201; for example, the height of the lower height fine gate protrusion 201 is 60%, 65%, 70%, 75%, 80%, 85%, or other proportions of the height of the higher fine gate protrusion 201. It should be noted that the ratio between the height of the lower-height fine grid protrusion 201 and the height of the higher-height fine grid protrusion 201 should not be too large. When the ratio is too large, the light reflected from the surface of the higher-height fine grid protrusion 201 will not reach the light-receiving surface of the solar cell, but will be blocked by the lower-height fine grid protrusion 201. Conversely, the ratio should not be too small. When the ratio is too small, less light will be reflected from the surface of the lower-height fine grid protrusion 201, failing to maximize the reflected light reaching the light-receiving surface of the solar cell, thus hindering the effective improvement of solar cell efficiency.

[0070] In some of these embodiments, at least one set of adjacent main gate protrusions 101 partially overlap in the width direction.

[0071] In some embodiments, the outer surface of at least one main gate protrusion 101 is curved, which increases the reflection of light. Preferably, the outer surface of each main gate protrusion 101 is curved. For example, the cross-section of the main gate protrusion 101 in the direction perpendicular to the light-receiving surface is approximately semi-elliptical, hill-shaped, tower-shaped, or similar.

[0072] In some embodiments, at least one set of adjacent fine gate protrusions 201 partially overlap in the width direction.

[0073] In some embodiments, the outer surface of at least one fine grating protrusion 201 is curved, which increases the reflection of light. Preferably, the outer surface of each fine grating protrusion 201 is curved. For example, the cross-section of the fine grating protrusion 201 in the direction perpendicular to the light-receiving surface is approximately semi-elliptical, hill-shaped, tower-shaped, or similar.

[0074] In some of these embodiments, see Figure 2 and Figure 3 As shown, Figure 2 , Figure 3 Two main grid protrusions 101 and two fine grid protrusions 201 are shown respectively. In this battery grid structure, the main grid line 100 and the fine grid line 200 each include two protrusions. That is, see [link to documentation]. Figure 2 As shown, the main gate line 100 includes two adjacent first main gate protrusions and a second main gate protrusion. The height H1 of the first main gate protrusion is greater than the height H2 of the second main gate protrusion, and the sum of the heights of the first and second main gate protrusions (H1+H2) is greater than or equal to the sum of the maximum half-widths of the first main gate protrusion and the maximum half-widths of the second main gate protrusion (W1+W2); and / or, see Figure 3 As shown, the fine gate line 200 includes adjacent first fine gate protrusions and second fine gate protrusions, and the height H1 of the first fine gate protrusion is... ’ Greater than the height H2 of the second fine gate protrusion ’ And the sum of the heights of the first fine gate protrusion and the second fine gate protrusion (H1) ’ +H2 ’ ) ≥ the sum of the maximum half-width of the first fine grid protrusion and the maximum half-width of the first fine grid protrusion (W1) ’ +W2 ’ In this embodiment, the height H1 of the first main gate protrusion is 4μm to 15μm. The width W1 of the first main gate protrusion is 3μm to 15μm. The height H2 of the second main gate protrusion is 3μm to 10μm. The width W1 of the second main gate protrusion is 1μm to 10μm. The height H1 of the first fine gate protrusion... ’ The width W1 of the first fine gate protrusion is 4μm to 15μm. ’ The diameter is 3μm to 15μm. The height H2 of the second fine gate protrusion... ’The width W2 of the second fine gate protrusion is 3μm to 15μm. ’ The range is from 1μm to 14μm.

[0075] An embodiment of this application also provides a solar cell.

[0076] A solar cell includes a cell body and a cell grid structure as described in any of the above embodiments. The cell grid structure is connected to the cell body and is used to collect and guide the current generated by the cell body.

[0077] In some embodiments, the battery body includes at least a backlight panel, a back film, battery cells, a front film, and a front panel stacked together. The back panel and front panel can each be photovoltaic glass panels. There can be multiple battery cells, which can form several battery strings. A battery grid structure is used to collect current from the battery cells and battery strings.

[0078] In some embodiments, the solar cells described above include, but are not limited to, monocrystalline silicon solar cells, multicrystalline silicon solar cells, and thin-film solar cells. For example, the solar cells described above include, but are not limited to, PERC (Passivated Emitter and Rear Cell) cells, TOPCon (Tunnel Oxide Passivated Contact) cells, and HJT (Heterojunction with Intrinsic Thin-layer) cells.

[0079] The aforementioned battery grid structure, through a specific grid structure design, provides protrusions of different heights on the main grid line 100 and / or the fine grid line 200. The protrusions of different heights increase the reflection of incident light, thereby increasing the battery's effective utilization of incident light and improving battery efficiency.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0082] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery grid line structure, characterized by, The battery grid structure includes a main grid line (100) and a fine grid line (200), and satisfies at least one of the following conditions (1) and (2): (1) The main grid line (100) includes a plurality of adjacent main grid protrusions (101), and the height of at least two of the plurality of main grid protrusions (101) is different, and the height of each main grid protrusion (101) is greater than its width; (2) The fine grid line (200) includes a plurality of adjacent fine grid protrusions (201), and the height of at least two of the plurality of fine grid protrusions (201) is different, and the height of each fine grid protrusion (201) is greater than its width.

2. The battery grid structure of claim 1, wherein, The battery grid structure satisfies at least one of the following conditions: (1) In the main grid lines (100), the sum H1+H2+...+H of the heights of the main grid protrusions (101) satisfies the following relationship: N H1+H2+...+HN≥2W 主 wherein W is the width of the main grid lines (100), and N is the number of the main grid protrusions (101). N 主 ​​ (2) In the main grid lines (100), the height H of each main grid convex part (101) satisfies the following relationship: arctan(H i / W i ) is between 25° and 75°, where 1≤i≤N. i / W i ) is between 25° and 75°, where 1≤i≤N.

3. The battery grid structure of claim 1, wherein, The battery grid structure satisfies at least one of the following conditions: (1) In the main grid line (100), the height of the main grid protrusion (101) with the maximum height is 4μm~15μm; (2) In the main grid line (100), the width of the main grid protrusion (101) with the maximum height is 3μm~15μm.

4. The battery grid structure of claim 1, wherein, The battery grid structure satisfies at least one of the following conditions: (1) In the main grid line (100), the height of the main grid protrusion (101) with the minimum height is 3μm~10μm; (2) In the main grid line (100), the width of the main grid protrusion (101) with the minimum height is 1μm~10μm.

5. The battery grid structure of claim 1, wherein, The battery grid structure satisfies at least one of the following conditions: (1) In the main grid line (100), the height of each main grid protrusion (101) is different, and the height of the main grid protrusion (101) decreases in turn along the direction from the middle position of the main grid line (100) to the edge position thereof; (2) The height of the main grid protrusion (101) with the non-maximum height is 60%~85% of the height of the main grid protrusion (101) with the maximum height.

6. The battery grid structure according to any one of claims 1 to 5, wherein The battery grid structure satisfies at least one of the following conditions: (1) The sum of the heights of each of the fine gate protrusions (201) in the fine gate line (200) and the width W of the fine gate line (200) 副 The following relationship is satisfied between them: H1 ’ +H2 ’ +...+H N ’ ≥2W 副 , where N ’ The number of the fine grid protrusions (201); (2) In the fine grid lines (200), the height H of each of the fine grid convex portions (201) i ’ is smaller than the maximum half-width W of the fine grid convex portion (201) i ’ satisfies the following relationship: arctan(H i ’ / W i ’ ) is between 45° and 85°, where 1≤i ’ ≤N ’ .

7. The battery grid structure according to any one of claims 1 to 5, wherein The battery grid structure satisfies at least one of the following conditions: (1) In the fine grid line (200), the height of the fine grid protrusion (201) with the maximum height is 4μm~15μm; (2) In the fine grid line (200), the width of the fine grid protrusion (201) with the maximum height is 3μm~15μm.

8. The battery grid structure according to any one of claims 1 to 5, wherein The battery grid structure satisfies at least one of the following conditions: (1) In the fine grid line (200), the height of the fine grid protrusion (201) with the minimum height is 3μm~15μm; (2) In the fine grid line (200), the width of the fine grid protrusion (201) with the minimum height is 1μm~14μm.

9. The battery grid structure according to any one of claims 1 to 5, wherein The battery grid structure satisfies at least one of the following conditions: (1) In the fine grid line (200), the height of each fine grid protrusion (201) is different, and the height of the fine grid protrusion (201) decreases in turn along the direction from the middle position of the fine grid line (200) to the edge position thereof; (2) The height of the fine grid convex part (201) that is not the maximum height is 60% to 85% of the height of the fine grid convex part (201) that is the maximum height.

10. A solar cell, characterized by, The battery grid line structure according to any one of claims 1 to 9 is connected to the battery main body.

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