Solar cell and photovoltaic module

Abstract

The invention relates to a solar cell and a photovoltaic module, the solar cell comprises a cell body, a plurality of fine grid lines, a reinforcing structure, a bonding pad, a connecting part and a welding strip, the plurality of fine grid lines are arranged on the cell body at intervals along a first direction, and the fine grid lines extend along a second direction; a plurality of reinforcing structures are arranged on each fine grid line at intervals, and the reinforcing structures extend in the second direction; each bonding pad is arranged between two adjacent fine grid lines; connecting parts are arranged on the reinforcing structure and the bonding pad; the welding strip is arranged on the battery piece body, and the connecting part is configured to guide tin when the welding strip is welded with the bonding pad and the reinforcing structure. In the application, the connecting parts are arranged on the reinforcing structure and the bonding pad, so that tin can be guided through the connecting parts when the welding strip is welded with the bonding pad and the reinforcing structure, local confluence of the tin is increased, the amount of the tin on the bonding pad and the reinforcing structure is increased, and the pulling-out force between the welding strip and the bonding pad and between the welding strip and the reinforcing structure is improved.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a solar cell and a photovoltaic module. Background Art

[0002] With the development of high-efficiency battery technology, the demand for silver paste consumption is increasing, and the proportion of silver paste in the entire battery cost is gradually increasing. Reducing the consumption of silver paste has become an increasingly urgent task. Busbar-free (OBB) technology has emerged. 0BB technology reduces costs by eliminating the busbars on the front and back of the battery and reducing the silver content. Since the busbars are eliminated from the welding ribbon and the battery, the spot welding of the welding ribbon and the pad (PAD) often results in low welding tension, or insufficient bonding strength between the welding ribbon and the centipede foot, which affects the reliability of the component. Summary of the invention

[0003] Based on this, it is necessary to provide a solar cell and photovoltaic module to address the technical problem in the prior art that the welding tension of the welding strip and the welding pad is low after the main grid line is removed, resulting in local cold welding.

[0004] A solar cell, comprising:

[0005] Battery cell body;

[0006] A plurality of fine grid lines are arranged on the battery cell body at intervals along a first direction, and the fine grid lines extend along a second direction;

[0007] A reinforcement structure, wherein a plurality of the reinforcement structures are arranged at intervals on each of the thin gate lines, the reinforcement structures extend along the second direction, and the size of the reinforcement structure in the first direction is greater than the size of the thin gate line in the first direction;

[0008] A pad is provided between two adjacent thin gate lines and / or on the thin gate line;

[0009] A connecting portion, the connecting portion is disposed on the reinforcing structure and is disposed below the pad;

[0010] The soldering strip is used to connect a plurality of battery cell bodies arranged side by side to form a battery string. The soldering strip is arranged on the battery cell body, and the connecting portion is configured to conduct tin when the soldering strip is welded to the soldering pad and the reinforcing structure.

[0011] The technical solution provides a solar cell, in which the cell body is used to absorb photons and differentially generate electron-hole pairs, thereby realizing the conversion of light energy into electrical energy. Fine grid lines are provided on the cell body, and the fine grid lines are used to transmit the collected electrical energy to an external load. A reinforcing structure is provided on the fine grid lines to improve the welding performance of the fine grid lines, so that the welding performance of the fine grid lines is better and the pull-off force is greater, thereby improving the welding performance of the solar cell. The pad is used to lead the current on the cell, and the welding strip is used to connect multiple solar cells and to connect to the junction box. In the present application, by providing a connecting portion on both the reinforcing structure and the pad, it is convenient to guide the tin through the connecting portion when welding the welding strip to the pad and the reinforcing structure, thereby increasing the local convergence of the tin, and then increasing the amount of tin on the pad and the reinforcing structure, thereby improving the pull-off force between the welding strip and the pad and the reinforcing structure.

[0012] In one embodiment, the connection portions connected to the same welding strip are located on the same straight line.

[0013] By arranging the connecting parts on the fine grid line and the soldering pad that are connected to the same soldering strip on the same straight line, when the soldering strip is soldered, the connecting parts on the fine grid line and the soldering pad can both contact the soldering strip, thereby guiding the tin during welding to increase the local convergence of the tin, thereby facilitating the improvement of the pulling force between the soldering strip and the soldering pad and the reinforcing structure.

[0014] In one embodiment, the connecting portion is located above the reinforcing structure, an extending direction of the connecting portion is perpendicular to an extending direction of the reinforcing structure, and two ends of the connecting portion extend out of two sides of the reinforcing structure.

[0015] By arranging the connection part above the reinforcing structure and arranging the connection part to be perpendicular to the reinforcing structure, the soldering strip can contact the connection part, thereby guiding the tin during soldering, thereby ensuring the pulling force between the soldering strip and the soldering pad and the reinforcing structure.

[0016] In one embodiment, the connection portion is disposed at the middle portion of the reinforcing structure along the second direction. By disposing the connection portion at the middle portion of the reinforcing structure along the second direction, the connection portion can correspond to the middle position of the solder strip, thereby ensuring the reliability of the alignment of the connection portion and the solder strip, thereby ensuring that the connection portion can reliably conduct tin, and further ensuring the pulling force between the solder strip, the solder pad and the reinforcing structure.

[0017] In one of the embodiments, a connecting portion is respectively provided at both ends of the pad along the first direction, the end of the connecting portion extends out of the end of the pad, the connecting portion extends along the first direction, and the two connecting portions on the same pad are spaced apart.

[0018] By arranging connecting parts at both ends of the pad along the first direction, and extending the ends of the connecting parts to the outside of the pad, the contact length between the connecting parts and the solder strip is longer along the length direction of the solder strip. The two connecting parts on the same pad are arranged at intervals, which is conducive to saving materials for the connecting parts, thereby reducing production costs. Through the above structure, while ensuring the contact area between the connecting part and the solder strip to ensure tin conduction, thereby increasing the amount of tin on the pad, thereby improving the pull-off force between the solder strip and the pad, the amount of material used in the connecting part can be reduced, thereby reducing costs.

[0019] In one embodiment, the width of the connection portion is in the range of 10-50um. The width of the connection portion is set in the range of 10-50um to ensure the contact area between the connection portion and the soldering strip, so as to guide the tin during welding, thereby ensuring the amount of tin between the reinforcement structure and the soldering strip, and further ensuring the drag force between the soldering strip and the reinforcement structure, while making the material usage of the connection portion more reasonable.

[0020] In one embodiment, the length of the portion of the connection portion extending from the reinforcement structure or the pad is in the range of 50-500um. The length of the portion of the connection portion extending from the reinforcement structure or the pad is set between 50-500um to ensure the contact area between the connection portion and the soldering strip, so as to guide the tin during welding, thereby ensuring the amount of tin between the reinforcement structure and the soldering strip, and further ensuring the drag force between the soldering strip and the reinforcement structure, while making the material usage of the connection portion more reasonable.

[0021] In one embodiment, the fine grid lines are partially disconnected on the reinforcement structure. Disconnecting the fine grid lines on the reinforcement structure can reduce the consumption of slurry by the fine grid lines without affecting reliability, thereby reducing production costs.

[0022] In one embodiment, the connecting portion is constructed as an equal-width structure. Setting the connecting portion as an equal-width structure makes the structure of the connecting portion simpler and easier to shape.

[0023] A photovoltaic assembly comprises the solar cell sheet as described above.

[0024] The solar cell sheets as above are applied to photovoltaic modules. By providing connecting parts on both the reinforcing structure and the soldering pad, it is convenient to guide the tin through the connecting parts when welding the soldering ribbon and the solar cell body, thereby increasing the local reflow of the tin, and further increasing the amount of tin on the soldering pad and the reinforcing structure, thereby improving the pulling force between the soldering ribbon, the soldering pad and the reinforcing structure.

[0025] Beneficial effects of the present invention:

[0026] The present invention provides a solar cell, in which the cell body is used to absorb photons and differentially generate electron-hole pairs, thereby realizing the conversion of light energy into electrical energy. Fine grid lines are provided on the cell body, and the fine grid lines are used to transmit the collected electrical energy to an external load. A reinforcing structure is provided on the fine grid lines to improve the welding performance of the fine grid lines, so that the welding performance of the fine grid lines is better and the pull-off force is greater, thereby improving the welding performance of the solar cell. The pad is used to lead the current on the cell, and the welding strip is used to connect multiple solar cells and to connect to a junction box. In the present application, by providing a connecting portion on both the reinforcing structure and the pad, it is convenient to guide the tin through the connecting portion when welding the welding strip to the pad and the reinforcing structure, thereby increasing the local reflux of the tin, and then increasing the amount of tin on the pad and the reinforcing structure, thereby improving the pull-off force between the welding strip and the pad and the reinforcing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of the structure of a solar cell provided by an embodiment of the present invention;

[0028] FIG2 is a schematic structural diagram of a solar cell provided by an embodiment of the present invention when no welding ribbon is welded;

[0029] FIG3 is a schematic diagram of a partially enlarged structure of a thin grid line portion in a solar cell provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of a partially enlarged structure of a solder pad portion in a solar cell provided by an embodiment of the present invention.

[0031] Reference numerals:

[0032] Cell body 100; fine grid lines 200; reinforcement structure 300; solder pad 400; connection portion 500; solder strip 600; first direction X; second direction Y. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] With the development of high-efficiency battery technology, the demand for silver paste consumption is increasing, and the proportion of silver paste in the entire battery cost is gradually increasing. Reducing the consumption of silver paste has become an increasingly urgent task. Busbar-free (OBB) technology has emerged. 0BB technology reduces costs by eliminating the busbars on the front and back of the battery and reducing the silver content. Since the busbars are eliminated from the welding ribbon and the battery, the spot welding of the welding ribbon and the pad (PAD) often results in low welding tension, or insufficient bonding strength between the welding ribbon and the centipede foot, which affects the reliability of the component.

[0040] Based on this, refer to Figures 1 to Figure 4 An embodiment of the present invention provides a solar cell, which includes a cell body 100, a fine grid line 200, a reinforcement structure 300, a solder pad 400, a connecting portion 500 and a solder strip 600. A plurality of fine grid lines 200 are arranged on the cell body 100 at intervals along a first direction X, and the fine grid lines 200 extend along a second direction Y; a plurality of reinforcement structures 300 are arranged on each fine grid line 200 at intervals, and the reinforcement structures 300 extend along the second direction Y. The size is larger than the size of the fine grid line 200 in the first direction X; the pad 400 is arranged between two adjacent fine grid lines 200 and / or on the fine grid line 200; a connecting portion 500 is arranged on the reinforcement structure 300, and a connecting portion 500 is arranged below the pad 400; the welding ribbon 600 is used to connect a plurality of battery cell bodies 100 arranged side by side to form a battery string, the welding ribbon 600 is arranged on the battery cell body 100, and the connecting portion 500 is configured to conduct tin when the welding ribbon 600 is welded to the welding pad 400 and the reinforcement structure 300.

[0041] The technical solution provides a solar cell, in which the cell body 100 is used to absorb photons and differentially generate electron-hole pairs, thereby realizing the conversion of light energy into electrical energy. By arranging fine grid lines 200 on the cell body 100, the fine grid lines 200 are used to transmit the collected electrical energy to an external load. By arranging a reinforcing structure 300 on the fine grid lines 200, the welding performance of the fine grid lines 200 is improved, so that the welding performance of the fine grid lines 200 is better and the pull-off force is greater, thereby improving the welding performance of the solar cell. The soldering pad 400 is used to lead the current on the cell, and the soldering ribbon 600 is used to connect multiple solar cells and to connect to a junction box. In the present application, a connecting portion 500 is provided on both the reinforcing structure 300 and the soldering pad 400, so that when welding the soldering strip 600, the soldering pad and the reinforcing structure, the tin can be guided through the connecting portion 500, thereby increasing the local convergence of the tin, and further increasing the amount of tin on the soldering pad 400 and the reinforcing structure 300, thereby improving the pulling force between the soldering strip 600 and the soldering pad 400 and the reinforcing structure 300.

[0042] It should be noted that, in this embodiment, the battery cell body 100 is a rectangular structure, and the first direction X and the second direction Y are perpendicular to each other. For example, as shown in Figures 1 and 2, the first direction is the X direction of the battery cell body, and the second direction is the direction of the battery cell body.

[0043] It is understandable that a plurality of pads 400 may be provided on a cell body 100, and all pads 400 may be provided between fine grid lines 200, or on fine grid lines 200. Of course, some pads 400 may be provided between adjacent fine grid lines 200, and some pads 400 may be provided on fine grid lines 200.

[0044] It should be noted that in the present embodiment, the fine grid lines 200, the reinforcement structure 300 and the connection part 500 are all arranged on the battery cell body 100 by the screen printing process. Specifically, the fine grid lines 200, the reinforcement structure 300 and the connection part 500 are all structures formed by printing silver paste on the battery cell body 100 by the screen printing process. Since the reinforcement structure 300, the fine grid lines 200 and the connection part 500 are printed and formed at the same time, the heights of the fine grid lines 200, the reinforcement structure 300 and the connection part 500 formed on the battery cell body 100 after printing are consistent. Since the solder pad 400 is screen-printed after the fine grid lines and the connection part are printed, the height of the solder pad 400 is higher than the height of the connection part 500. In the present embodiment, no main grid lines are arranged on the battery cell body 100.

[0045] The specific structure of the reinforcing structure 300 is not limited. The reinforcing structure 300 can be set as a trapezoidal structure with the connecting portion 500 as the symmetric center, and the width of the end of the trapezoidal structure close to the connecting portion 500 is set to be smaller than the width of the end away from the connecting portion 500. Under the premise of reducing the loss of slurry by the reinforcing structure 300, the reliability of the connection between the fine grid line 200 and the reinforcing structure 300 can be guaranteed. In this way, during printing, even if the fine grid line 200 is offset, it can be ensured that the fine grid line 200 and the reinforcing structure 300 overlap.

[0046] In another embodiment, the middle section and both end sections of the reinforcement structure 300 can be set to an equal width structure, and the width of the middle section is greater than the width of the end sections. The width of the ends of the thin grid lines 200 overlapping the reinforcement structure 300 is configured as a gradual structure, wherein the width of the ends of the thin grid lines 200 gradually decreases from the end facing the main grid line to the end away from the connecting portion 500, and the width of the ends of the thin grid lines 200 is greater than the width of the middle portion of the thin grid lines 200.

[0047] As shown in Figure 1 to Figure 4 As shown, in one embodiment, the connection parts 500 connected to the same welding strip 600 are located on the same straight line. By arranging the connection parts 500 on the fine grid line 200 and the welding pad 400 connected to the same welding strip 600 on the same straight line, when welding the welding strip 600, the connection parts 500 on the fine grid line 200 and the welding pad 400 can both contact the welding strip 600, thereby guiding the tin during welding to increase the local convergence of the tin, thereby facilitating the improvement of the pulling force between the welding strip 600 and the welding pad 400 and the reinforcing structure 300.

[0048] As shown in Figure 1 to Figure 4 As shown, in one embodiment, the connection portion 500 is located above the reinforcing structure 300, the extension direction of the connection portion 500 is perpendicular to the extension direction of the reinforcing structure 300, and the two ends of the connection portion 500 extend out of the two sides of the reinforcing structure 300. By arranging the connection portion 500 above the reinforcing structure 300 and arranging the connection portion 500 in a form perpendicular to the reinforcing structure 300, the welding strip 600 can contact the connection portion 500, thereby guiding the tin during welding, thereby ensuring the pulling force between the welding strip 600 and the pad 400 and the reinforcing structure 300.

[0049] As shown in Figure 1 to Figure 4As shown, in one embodiment, the connection portion 500 is disposed at the middle portion of the reinforcing structure 300 along the second direction Y. By disposing the connection portion 500 at the middle portion of the reinforcing structure 300 along the second direction Y, the connection portion 500 can correspond to the relatively middle position of the soldering strip 600, thereby ensuring the reliability of the alignment of the connection portion 500 and the soldering strip 600, thereby ensuring that the connection portion 500 can reliably conduct tin, and further ensuring the pulling force between the soldering strip 600 and the soldering pad 400 and the reinforcing structure 300.

[0050] As shown in Figure 1 to Figure 4 As shown, in one embodiment, a connecting portion 500 is respectively provided at both ends of the pad 400 along the first direction X, and the end of the connecting portion 500 extends out of the end of the pad 400. The connecting portion 500 extends along the first direction X, and the two connecting portions 500 on the same pad 400 are spaced apart.

[0051] By arranging the connection part 500 at both ends of the pad 400 along the first direction X, and extending the end of the connection part 500 to the outside of the pad 400, the contact length between the connection part 500 and the solder strip 600 is longer along the length direction of the solder strip 600. The two connection parts 500 on the uniform pad 400 are arranged at intervals, which is conducive to saving the material of the connection part 500, thereby reducing the production cost. Through the above structure, while ensuring the contact area between the connection part 500 and the solder strip 600 to ensure tin conduction, thereby increasing the amount of tin on the pad 400, thereby improving the pull-off force between the solder strip 600 and the pad 400, the material consumption of the connection part 500 can be reduced, thereby reducing the cost.

[0052] As shown in Figure 1 to Figure 4 As shown, in one embodiment, the width of the connection portion 500 is in the range of 10-50um. The width of the connection portion 500 is set in the range of 10-50um to ensure the contact area between the connection portion 500 and the soldering strip 600, so as to guide the tin during welding, thereby ensuring the amount of tin between the reinforcement structure 300 and the soldering strip 600, and further ensuring the drag force between the soldering strip 600 and the reinforcement structure 300, while making the material usage of the connection portion 500 more reasonable.

[0053] In one embodiment, the length of the portion of the connection portion 500 extending from the reinforcement structure 300 or the pad 400 is in the range of 50-500um. The length of the portion of the connection portion 500 extending from the reinforcement structure 300 or the pad 400 is set between 50-500um to ensure the contact area between the connection portion 500 and the soldering strip 600, so as to conduct tin during welding, thereby ensuring the amount of tin between the reinforcement structure 300 and the soldering strip 600, and further ensuring the drag force between the soldering strip 600 and the reinforcement structure 300, while making the material usage of the connection portion 500 more reasonable.

[0054] As shown in Figure 1 to Figure 4 As shown, in one embodiment, the fine grid line 200 is partially disconnected on the reinforcing structure 300. Disconnecting the fine grid line 200 at the reinforcing structure 300 can reduce the consumption of slurry by the fine grid without affecting reliability, thereby reducing production costs.

[0055] It should be noted that, in this embodiment, when the reinforcing structure 300 and the fine grid lines 200 are not printed at the same time, the fine grid lines 200 are partially disconnected at the reinforcing structure 300 to reduce slurry consumption and thus reduce production costs.

[0056] Of course, when the fine grid lines 200 and the reinforcement structure 300 are simultaneously formed by screen printing, there is no disconnection of the fine grid lines 200 in the reinforcement structure 300 portion.

[0057] As shown in Figure 1 to Figure 4 As shown, in one embodiment, the connecting portion 500 is configured as an equal-width structure. The connecting portion 500 is configured as an equal-width structure, so that the structure of the connecting portion 500 is simpler and easier to form. Of course, in other embodiments, the connecting portion 500 can also be configured as a trapezoidal structure, etc.

[0058] In the present invention, connecting parts 500 are respectively provided on the reinforcing structure 300 and the pad 400, so as to perform local reinforcement. Specifically, connecting parts 500 are added at both ends of the pad 400 along the first direction X, and the connecting parts 500 are located on both sides of the pad 400. The connecting parts 500 are parallel to the direction of the solder strip 600 and perpendicular to the fine grid line 200. Among them, the width of the connecting part 500 is between 10-50um; the length of the part where the connecting part 500 is exposed from the pad 400 is between 50-500um. The connecting part 500 is locally added to the reinforcing structure 300, and the connecting part 500 is located on both sides of the reinforcing structure 300 or runs through the entire reinforcing structure 300 along the first direction X. The connection part 500 and the welding strip 600 are parallel and perpendicular to the fine grid line 200, wherein the width of the connection part 500 is between 10-50um, and the length of the part of the connection part 500 exposed from the reinforcement structure 300 is between 50-500um; the reinforcement structure 300 between the 0BB battery pad 400 and the pad 400 is strengthened to increase the local connection part 500 to play the function of tin conduction and tin collection. During welding, the welding strip 600 is in contact with the pad 400, and the tin in the area of ​​the welding strip 600 beyond the pad 400 can be collected on the pad 400 through the local connection part 500, thereby increasing the amount of tin in the pad 400 and improving the welding tension. When the welding strip 600 and the reinforcement structure 300 are welded and contacted, the tin of the welding strip 600 that exceeds the area of ​​the reinforcement structure 300 can be tinned to the reinforcement structure 300 through the local connection part 500 on the reinforcement structure 300, thereby increasing the bonding strength between the welding strip 600 and the reinforcement structure 300, reducing the reliability risk caused by cold welding or low tensile force, and improving the reliability of photovoltaic modules.

[0059] A photovoltaic module, comprising the above solar cell. The above solar cell is applied to the photovoltaic module, and a connection portion 500 is provided on both the reinforcing structure 300 and the soldering pad 400, so that when the soldering ribbon 600 and the cell body 100 are soldered, the tin is guided through the connection portion 500, thereby increasing the local tin reflow, thereby increasing the amount of tin on the soldering pad 400 and the reinforcing structure 300, and thus improving the pulling force between the soldering ribbon 600 and the soldering pad 400 and the reinforcing structure 300.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A solar cell, characterized in that: The solar cell comprises: Battery cell body; A plurality of fine grid lines are arranged on the battery cell body at intervals along a first direction, and the fine grid lines extend along a second direction; A reinforcement structure, wherein a plurality of the reinforcement structures are arranged at intervals on each of the thin gate lines, the reinforcement structures extend along the second direction, and the size of the reinforcement structure in the first direction is greater than the size of the thin gate line in the first direction; A pad is provided between two adjacent thin gate lines and / or on the thin gate line; A connecting portion, the reinforcing structure is provided with the connecting portion, and the pad is provided with the connecting portion; The soldering strip is used to connect a plurality of battery cell bodies arranged side by side to form a battery string. The soldering strip is arranged on the battery cell body, and the connecting portion is configured to conduct tin when the soldering strip is welded to the soldering pad and the reinforcing structure.

2. The solar cell according to claim 1, characterized in that: The connection portions connected to the same welding strip are located on the same straight line.

3. The solar cell according to claim 1, characterized in that: The connecting portion is located above the reinforcing structure, an extending direction of the connecting portion is perpendicular to an extending direction of the reinforcing structure, and two ends of the connecting portion extend out of two sides of the reinforcing structure.

4. The solar cell according to claim 3, characterized in that: The connecting portion is disposed at a middle portion of the reinforcing structure along the second direction.

5. The solar cell according to claim 1, characterized in that: The two ends of the pad along the first direction are respectively provided with a connecting portion, the end of the connecting portion extends out of the end of the pad, the connecting portion extends along the first direction, and the two connecting portions on the same pad are spaced apart.

6. The solar cell according to claim 3 or 5, characterized in that: The width of the connecting portion ranges from 10 to 50 μm.

7. The solar cell according to claim 3 or 5, characterized in that: The length of the portion of the connecting portion extending out of the reinforcing structure or the pad is in the range of 50-500 um.

8. The solar cell according to claim 1, characterized in that: The fine grid lines are partially disconnected on the reinforcement structure.

9. The solar cell according to claim 1, characterized in that: The connecting portion is configured as a structure with equal width.

10. A photovoltaic module, characterized in that: The photovoltaic module comprises the solar cell according to any one of claims 1 to 9.

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