Electrode structure, battery piece and photovoltaic module

Abstract

The utility model discloses an electrode structure, a battery piece and a photovoltaic module, and the electrode structure comprises a plurality of main grids which are arranged in parallel and at intervals; the number of the auxiliary grids is multiple, the auxiliary grids are parallel and are arranged at equal intervals, the auxiliary grids and the main grids are vertically intersected, at least one auxiliary grid in the auxiliary grids is partially broken to form at least one notch, the distance between every two adjacent auxiliary grids is D, and in the extending direction of the auxiliary grids, the distance between every two adjacent auxiliary grids is D; the length of the notch is d, and d is smaller than or equal to D. According to the electrode structure, under the condition that the width of the auxiliary grid is not reduced, the using amount of silver paste used for printing the metal electrode is reduced, the light receiving area of the battery piece is increased, and meanwhile the conversion efficiency of the battery piece is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of solar photovoltaics, and in particular to an electrode structure, a cell and a photovoltaic module. Background Art

[0002] In daily life, solar cells are becoming more and more popular with the public due to their energy-saving and environmentally friendly characteristics, and more and more fields are beginning to use solar cells. Solar cells can convert solar energy into electrical energy using the photovoltaic effect. The generated electrical energy is conducted by metal electrodes and used to supply various electrical devices or be stored.

[0003] Solar cells are composed of cells, and solar cells can be used together with aluminum frames, glass cover plates, adhesive films, back plates, etc. to form photovoltaic modules. The design of the electrode structure on the surface of the cell is a crucial issue. The existing electrode structure of the cell mainly adopts a plurality of main grids and a plurality of auxiliary grids arranged perpendicular to each other. This design results in the surface shading area of ​​the cell being too high, the light receiving area being too small, the conversion efficiency of the cell being limited, and the amount of silver paste used to print the electrode structure being too large, resulting in the cost of the cell being too high. In the prior art, the light receiving area of ​​the cell is generally increased by optimizing the width of the auxiliary grid of the metal electrode, thereby achieving the effect of reducing the amount of silver paste used, thereby saving costs. However, due to the limitations of the prior art, if the width of the fine grid is too narrow, problems such as poor printing will occur, which will in turn affect the conversion efficiency of the cell. Utility Model Content

[0004] The present application discloses an electrode structure, a cell and a photovoltaic module, which can reduce the amount of silver paste used for printing metal electrodes without reducing the width of the secondary grid, increase the light-receiving area of ​​the cell, and at the same time ensure the conversion efficiency of the cell.

[0005] In order to achieve the above objectives, in a first aspect, the present application discloses an electrode structure, comprising:

[0006] The main grid is multiple in number and the multiple main grids are arranged in parallel and at intervals.

[0007] A secondary grid, wherein the number of the secondary grids is multiple, the multiple secondary grids are arranged in parallel and at equal intervals, the multiple secondary grids intersect the multiple main grids vertically, at least one of the multiple secondary grids is partially disconnected to form at least one gap, the spacing between two adjacent secondary grids is D, and along the extension direction of the secondary grid, the length of the gap is d, wherein d≤D.

[0008] The electrode structure of the present application includes: a main grid and a sub-grid, the number of the main grid is multiple, and the multiple main grids are arranged in parallel and at intervals, the number of the sub-grid is multiple, and the multiple sub-grids are arranged in parallel and at equal intervals, so the multiple main grids and the multiple sub-grids can be used to collect and collect current. Among them, the multiple sub-grids intersect the multiple main grids vertically, so the current collected by the multiple sub-grids can be collected into the multiple main grids that intersect vertically therewith. At least one of the multiple sub-grids of the electrode structure of the present application is partially disconnected to form a gap, that is, silver paste printing is not required at the gap, so the amount of silver paste used for printing metal electrodes can be reduced. At the same time, since silver paste is not printed at the gap, this design will also increase the light-receiving area of ​​the battery cell. However, if the length of the gap is too large, the transmission resistance of the electrode structure will increase, thereby affecting the conversion efficiency of solar energy, so the length of the gap needs to be subject to certain restrictions. The gap is subject to the following restrictions: along the extension direction of the sub-grid, the length of the gap is d, and the spacing between two adjacent sub-grids is D, where d≤D.

[0009] By setting in this way, the electrode structure of the present application can reduce the amount of silver paste used for printing metal electrodes without reducing the width of the secondary grid, increase the light-receiving area of ​​the cell, and at the same time ensure the conversion efficiency of the cell.

[0010] As an optional implementation, the length d of the notch satisfies: 0.5 mm ≤ d ≤ D. By setting a minimum value for the notch length, a better balance is achieved between the cost and the light receiving area of ​​the cell.

[0011] As an optional implementation, there are multiple gaps, and the multiple gaps are evenly distributed in the electrode structure. By setting it in this way, the amount of silver paste used for printing the electrode structure can be further reduced, and the evenly distributed gaps can make the current more evenly distributed in the electrode structure, reducing the problem of overheating of the battery cell caused by excessive local current density, thereby improving the stability and reliability of the electrode structure.

[0012] As an optional implementation, the auxiliary grid includes a plurality of sub-sub-grids, wherein the sub-sub-grid is the portion between the intersection of the auxiliary grid and two adjacent main grids, and each of the sub-sub-grids is partially disconnected to form a notch. By setting it in this way, there is only one notch in each sub-sub-grid, which avoids the situation where the local transmission resistance of the electrode structure increases due to the concentration of multiple notches in one sub-grid, and reduces the risk of hot spot effect in the battery cell due to the increase of local transmission resistance.

[0013] As an optional implementation, the gaps of the plurality of sub-grids between the adjacent main grids are aligned along the extension direction of the main grid. By setting in this way, the uniformity of the electrode structure is improved, and the current can flow more evenly from the sub-grid to the main grid. In addition, the gaps are aligned along the extension direction of the main grid, making it easier to manufacture the screen for printing the sub-grid, simplifying the manufacturing process of the screen and improving the manufacturing efficiency.

[0014] As an optional implementation, the notches of the plurality of sub-grids between the adjacent main grids are all located at the midpoint of the sub-grids. By setting this arrangement, the distances from the current at the notch to the sub-grids on both sides are equal, so that the current is more evenly distributed on the sub-grid. And setting the notch at the midpoint of the sub-grid can make the force on the entire electrode structure more uniform, reducing the possibility of damage to the electrode structure due to stress concentration.

[0015] As an optional implementation, the electrode structure further includes a plurality of anti-breaking grids, and along the extension direction of the main grid, one anti-breaking grid is connected between every two adjacent sub-grids. By such an arrangement, every two adjacent sub-grids are connected, so that the electrode structure can provide more current paths, which is conducive to the transmission of current and improves the transmission efficiency. It also reduces the risk of hot spot effect caused by the broken grid of the electrode structure, and increases the stability and safety of the electrode structure.

[0016] As an optional implementation, the plurality of anti-breakage grids are perpendicular to the plurality of sub-grids. By setting it in this way, the anti-breakage grids are perpendicular to the sub-grids, so that the length of the anti-breakage grid can be minimized, thereby saving the amount of silver paste and reducing costs.

[0017] As an optional embodiment, the two adjacent main gates include a first main gate and a second main gate, the two adjacent sub-gates include a first sub-gate and a second sub-gate, a first notch is formed on the first sub-gate to separate the first sub-gate into two endpoints, a second notch is formed on the second sub-gate to separate the second sub-gate into two endpoints, one end of the anti-break gate is connected to one of the endpoints of the first sub-gate, and the other end of the anti-break gate is connected to one of the endpoints of the second sub-gate.

[0018] By such an arrangement, the two ends of the anti-breaking grid are respectively connected to an end point of the first sub-grid and an end point of the second sub-grid, so that the current at the end points of the two adjacent sub-grids can be transmitted to the main grid through the anti-breaking grid, reducing the transmission resistance of the electrode structure, and the anti-breaking grid is connected at the notch, so that the stability of the electrode structure is higher.

[0019] As an optional implementation, the first notch separates the first sub-grid into a first endpoint and a second endpoint, the second notch separates the second sub-grid into a third endpoint and a fourth endpoint, the second endpoint is located at the midpoint of the first sub-grid, the third endpoint is located at the midpoint of the second sub-grid, the anti-break grid connects the second endpoint and the third endpoint, the first notch is located on a side of the anti-break grid close to the first main grid, and the second notch is located on a side of the anti-break grid close to the second main grid.

[0020] By setting it in this way, the uniformity of the entire electrode structure is improved, and the current collection is made more uniform. In addition, when the anti-break grid is set in the electrode structure, the amount of silver paste can be reduced to the maximum extent, the cost can be reduced, and the light receiving area of ​​the battery cell can be made larger. The electrode structure under this design can achieve a better balance among the amount of silver paste, the light receiving area, the current transmission resistance, the manufacturing difficulty of the electrode structure, and the stability of the electrode structure, so that the battery cell has a higher efficiency.

[0021] In a second aspect, the present application discloses a battery cell, the battery cell comprising:

[0022] substrate;

[0023] As described in the first aspect, the electrode structure is arranged on the front and / or back of the substrate. By so arranging, the battery cell with the electrode structure can reduce the amount of silver paste used for printing metal electrodes without reducing the width of the secondary grid during the manufacturing process, increase the light receiving area of ​​the battery cell, and at the same time ensure the conversion efficiency of the battery cell, and the electrode structure arranged on both sides can further increase the efficiency of the battery cell.

[0024] In a third aspect, the present application discloses a photovoltaic module, including the cell as described in the first aspect. By such an arrangement, the photovoltaic module with the cell can also reduce the amount of silver paste used for printing metal electrodes without reducing the width of the secondary grid, increase the light receiving area of ​​the cell, and at the same time ensure the conversion efficiency of the cell, thereby increasing the benefits of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic diagram of the electrode structure of the present application;

[0027] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0028] Figure 3 A schematic diagram of the gap of this application;

[0029] Figure 4 A schematic diagram of a battery cell of the present application;

[0030] Figure 5 A schematic diagram of uniform distribution of notches in the electrode structure of the present application;

[0031] Figure 6 Another schematic diagram of the uniform distribution of the notches in the electrode structure of the present application;

[0032] Figure 7 A schematic diagram of a sub-grid of the present application;

[0033] Figure 8 A schematic diagram showing that the notch of the present application is located at the midpoint of the sub-grid;

[0034] Fig. 9 A schematic diagram of a design method of the anti-break fence of the present application;

[0035] Fig.10 A schematic diagram of design method b of the anti-break fence of the present application;

[0036] Fig.11 A schematic diagram of the c design method of the anti-break gate of the present application;

[0037] Fig.12 A schematic diagram of the design method d of the anti-break fence of the present application;

[0038] Fig.13 It is a schematic diagram of the deformation part and the straight part of the present application;

[0039] Fig.14 Schematic diagram of current flow at the notch of the electrode structure of the present application.

[0040] Description of main reference numerals:

[0041] 100-battery cell; 200-substrate; 300-electrode structure; 1-main grid; 11-first main grid; 12-second main grid; 2-auxiliary grid; 21-sub-auxiliary grid; 211-first sub-auxiliary grid; 211a-first terminal; 211b-second terminal; 212-second sub-auxiliary grid; 212a-third terminal; 212b-fourth terminal; 22-notch; 221-first notch; 222-second notch; 23-deformation part; 24-straight part; 3-anti-break grid; 4-soldering pad; 5-harpoon part. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0044] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0045] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0046] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0047] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0048] Photovoltaic modules include cells, which include electrode structures and substrates. The electrode structure is mainly used to collect the current generated by the substrate. The raw material of the electrode structure is generally silver paste, and the electrode structure is generally made by screen printing silver paste.

[0049] The present application embodiment provides an electrode structure 300, such as Figure 1 and Figure 4 As shown, the electrode structure 300 includes: a main grid 1 and a secondary grid 2, wherein the number of main grids 1 is multiple, and the multiple main grids 1 are arranged in parallel and at intervals, and the number of secondary grids 2 is multiple, and the multiple secondary grids 2 are arranged in parallel and at equal intervals, so the multiple main grids 1 and the multiple secondary grids 2 can be used to collect and collect current. Since the multiple secondary grids 2 intersect the multiple main grids 1 perpendicularly, the current collected by the multiple secondary grids 2 can be collected into the multiple main grids 1 intersecting with them. Figure 2 As shown, at least one of the multiple sub-grids 2 of the electrode structure 300 is partially disconnected to form a gap 22, that is, silver paste printing is not required at the gap 22, so the amount of silver paste used to print the metal electrode can be reduced. At the same time, since silver paste is not printed at the gap 22, that is, there is no silver paste blocking the substrate 200 at the gap 22, the present design will also increase the light receiving area of ​​the battery cell 100, so that the battery cell 100 can generate more current. However, if the length of the gap 22 in the sub-grid 2 is too large, the transmission resistance of the electrode structure 300 will increase, affecting the transmission of current, and further affecting the conversion efficiency of the battery cell 100, so the length of the gap 22 needs to be subject to certain restrictions. In the present application, the gap 22 is subject to the following restrictions: Figure 3 As shown, along the extension direction of the auxiliary grid 2, the length of the notch 22 is d, and the spacing between two adjacent auxiliary grids 2 is D, where d≤D. By setting in this way, the electrode structure 300 of the present application can reduce the amount of silver paste used for printing the metal electrode without reducing the width of the auxiliary grid 2, increase the light receiving area of ​​the battery cell 100, and at the same time ensure the conversion efficiency of the battery cell 100.

[0050] It should be noted that the electrode structure 300 is composed of a plurality of main grids 1 and a plurality of auxiliary grids 2. The number of main grids 1 is not limited. For example, the number of main grids 1 can be 6 to 16. The intervals between the plurality of main grids 1 can be equal, or different intervals can be designed according to specific circumstances. In addition, the current flow direction at the notch 22 is as follows: Fig.14 shown.

[0051] Furthermore, the length d of the notch 22 satisfies: 0.5mm≤d≤D. When the length of the notch 22 is less than 0.5mm, the overall benefit of the cell 100 is reduced after considering the amount of silver paste used and the light-receiving area. When the length d of the notch 22 is greater than the spacing D between the sub-grids 2, the transmission resistance of the electrode structure 300 will increase significantly, causing the current collection efficiency of the cell 100 to be significantly reduced. Therefore, the value range of the length d of the notch 22 satisfies: 0.5mm≤d≤D. By setting it in this way, the cell 100 can achieve a better balance between current collection efficiency, cost and light-receiving area.

[0052] It should be noted that there are many designs for the spacing D between the auxiliary grids 2. For example, the spacing between two auxiliary grids 2 can be 1.2 mm, and the length d of the notch 22 must satisfy: 0.5≤d≤1.2 mm; in addition, the spacing between two adjacent auxiliary grids 2 can also be 1.38 mm, and the length d of the notch 22 must satisfy: 0.5≤d≤1.38 mm. Of course, the spacing between two auxiliary grids 2 can also be other sizes.

[0053] There are many ways to design the number of notches 22. For example, the electrode structure 300 may have only one notch 22. In addition, there may be multiple notches 22, and the multiple notches 22 may be randomly distributed in the electrode structure 300. Further, the multiple notches 22 may be evenly distributed in the electrode structure 300, and the multiple notches 22 may be arranged as follows: Figure 5 The design shown is evenly distributed in the electrode structure 300, and can also be as follows Figure 6 The design shown is evenly distributed in the electrode structure 300, and there are many distribution forms of the plurality of notches 22, including but not limited to the above-mentioned methods, as long as they are evenly distributed in the electrode structure 300. By providing a plurality of notches 22, the amount of silver paste used for printing the electrode structure 300 can be further reduced, and the evenly distributed notches 22 can make the current evenly distributed in the electrode structure 300, reducing the problem of overheating of the battery cell 100 caused by excessively high local current density, thereby improving the stability and reliability of the electrode structure 300.

[0054] In some implementations, such as Figure 7 As shown, the auxiliary grid 2 in the electrode structure 300 may include a plurality of sub-auxiliary grids 21, and the sub-auxiliary grid 21 is the portion between the intersections of the auxiliary grid 2 and two adjacent main grids 1, and each sub-auxiliary grid 21 is partially disconnected to form a gap 22. By such a configuration, there is only one gap 22 in each sub-auxiliary grid 21, which avoids the situation that the distance from the local current to the auxiliary grid 2 increases due to the concentration of multiple gaps 22 in one sub-auxiliary grid 21, thereby increasing the local transmission resistance of the electrode structure 300, causing the battery cell 100 to have a hot spot effect, thereby improving the safety of the battery cell 100.

[0055] There are many ways to design the position of the notch 22. For example, a plurality of notches 22 can be randomly distributed in each sub-grid 21. Figure 7As shown, the gaps 22 of the multiple sub-grids 21 located between adjacent main grids 1 are aligned along the extension direction of the main grid 1, that is, from the perspective of the entire electrode structure 300, the multiple gaps 22 located between the adjacent main grids 1 are arranged in a straight line. By setting it in this way, the uniformity of the electrode structure 300 is better, and the current can flow more evenly from the sub-grid 2 to the main grid 1, thereby improving the current collection efficiency. And because the electrode structure 300 is made by screen printing silver paste, different electrode structures 300 need to design corresponding screens. This design can make the screen used for printing the sub-grid 2 easier to make, simplify the screen manufacturing process, and improve the manufacturing efficiency of the electrode structure 300.

[0056] Furthermore, if Figure 8 As shown, the notches 22 of the plurality of sub-grids 21 located between adjacent main grids 1 are all located at the midpoint of the sub-grids 21. By such a configuration, the distances at which the current at the notch 22 reaches the sub-grids 21 on both sides are equal, so that the current can be more evenly distributed on the sub-grid 2. Furthermore, by arranging the notch 22 at the midpoint of the sub-grid 21, the force on the entire electrode structure 300 can be more evenly applied, preventing the electrode structure 300 from being damaged due to stress concentration during welding, thereby enabling the electrode structure 300 to have better stability.

[0057] In some implementations, the electrode structure 300 further includes a plurality of anti-breakage grids 3. Along the extension direction of the main grid 1, an anti-breakage grid 3 is connected between every two adjacent sub-grids 21. Fig. 9 As shown, there are multiple sub-grids 21 between two adjacent main grids 1 , and every two adjacent sub-grids 21 are grouped in pairs and connected by an anti-break grid 3 .

[0058] By such arrangement, every two adjacent sub-grids 21 are connected, so that the electrode structure 300 can provide more current paths, reduce the occurrence of local current path blocking caused by virtual printing or broken grid of the electrode structure 300, and be more conducive to the transmission of current and improve the transmission efficiency. It also reduces the risk of hot spot effect caused by local broken grid of the electrode structure 300, and increases the stability and safety of the electrode structure 300.

[0059] There are many ways to design the anti-breakage fence 3. For example, the anti-breakage fence 3 can be an inclined straight line, a wavy line, an arc line, etc., as long as the anti-breakage fence 3 connects two adjacent sub-grids 21. Fig. 9 The design shown is that the multiple anti-breakage grids 3 are perpendicular to the multiple sub-grids 21. By setting the multiple anti-breakage grids 3 perpendicular to the multiple sub-grids 21, the length of the anti-breakage grids 3 can be minimized, thereby further saving the amount of silver paste and reducing costs.

[0060] There are many ways to design the connection position between the anti-break grid 3 and the two adjacent sub-grids 21. For example, the connection position between the anti-break grid 3 and the two adjacent sub-grids 21 can be as follows: Fig. 9 The design shown in FIG. 1 is that the anti-break grid 3 is connected to a position on the sub-grid 21 away from the notch 22 .

[0061] In addition, if Fig.10 As shown, two adjacent main grids 1 include a first main grid 11 and a second main grid 12, two adjacent sub-grids 21 include a first sub-grid 211 and a second sub-grid 212, a first notch 221 is formed on the first sub-grid 211 to separate the first sub-grid 211 into two endpoints, a second notch 222 is formed on the second sub-grid 212 to separate the second sub-grid 212 into two endpoints, one end of the anti-break grid 3 is connected to one endpoint of the first sub-grid 211, and the other end of the anti-break grid 3 is connected to one endpoint of the second sub-grid 212. That is, the two ends of the anti-break grid 3 are respectively connected to one endpoint of the first sub-grid 211 and one endpoint of the second sub-grid 212.

[0062] Specifically, the anti-break fence 3 can be Fig.10 The anti-break grid 3 is connected to the two ends close to the first main grid 11. Similarly, the anti-break grid 3 can be connected to the two ends close to the second main grid 12. In addition, the anti-break grid 3 can also be connected according to Fig.11 By such an arrangement, the two ends of the anti-break gate 3 are respectively connected to one end of the first sub-grid 211 and one end of the second sub-grid 212, so that the current at the end points of the two adjacent sub-grids 21 can be transmitted to the main grid 1 through the anti-break gate 3, thereby reducing the transmission resistance of the electrode structure 300, and the anti-break gate 3 is connected at the notch 22, so that the stability of the electrode structure 300 is higher.

[0063] Furthermore, if Fig.12 As shown, the first notch 221 in the electrode structure 300 separates the first sub-grid 211 into a first endpoint 211a and a second endpoint 211b, the second notch 222 separates the second sub-grid 212 into a third endpoint 212a and a fourth endpoint 212b, the second endpoint 211b is located at the midpoint of the first sub-grid 211, the third endpoint 212a is located at the midpoint of the second sub-grid 212, the anti-break grid 3 connects the second endpoint 211b and the third endpoint 212a, the first notch 221 is located on a side of the anti-break grid 3 close to the first main grid 11, and the second notch 222 is located on a side of the anti-break grid 3 close to the second main grid 12.

[0064] By setting it in this way, the uniformity of the electrode structure 300 is better, which is convenient for manufacturing using screen printing, and the current collection can be made more uniform. With this design, the amount of silver paste can be minimized when the anti-break grid 3 is set in the electrode structure 300, the manufacturing cost can be reduced, and the light receiving area of ​​the battery cell 100 can be made larger. The electrode structure 300 under this design can achieve a better balance among the amount of silver paste, the light receiving area, the current transmission resistance, the manufacturing difficulty of the electrode structure 300, and the stability of the electrode structure 300, so that the battery cell 100 has a higher benefit.

[0065] Optionally, due to the presence of multiple gaps 22 in the electrode structure 300, the amount of silver paste used to print the electrode structure 300 is reduced when other parameters of the electrode structure 300 remain unchanged. Therefore, the amount of silver paste reduced due to the presence of the gaps 22 can be used to widen the width of the sub-grid 2. In this way, the local transmission resistance of the electrode structure 300 will be reduced, thereby increasing the current transmission efficiency of the battery cell 100 without changing the cost.

[0066] In some implementations, such as Fig.13 As shown, the sub-grid 21 includes a deformation portion 23 and a straight portion 24. The deformation portion 23 is arranged at the intersection of the main grid 1 and the sub-grid 21. One end of the straight portion 24 is connected to the deformation portion 23, and the width of the deformation portion 23 is greater than the straight portion 24. By setting it in this way, the connection area between the sub-grid 21 and the main grid 1 can be made larger, thereby making the connection more stable, reducing the situation where the connection between the sub-grid 21 and the main grid 1 is disconnected due to external force or other reasons during use of the electrode structure 300, thereby reducing the possibility of hot spot effect in the battery cell 100, and making the stability and safety of the electrode structure 300 higher. It should be noted that the shape design of the deformation portion 23 can be a trapezoid, a rectangle, or other shapes, as long as the width of the deformation portion 23 is greater than the width of the straight portion 24, and the specific shape is not limited here.

[0067] In order to better connect the multiple electrode structures 300 in series, multiple pads 4 may be provided in the electrode structure 300. Figure 2 As shown, the pad 4 is located at the intersection of the main grid 1 and the auxiliary grid 2. By providing the pad 4, the strength of the connection between the main grid 1 and the auxiliary grid 2 can be enhanced, and the risk of the electrode structure 300 breaking during the series welding process can be reduced, thereby making the electrode structure 300 more stable.

[0068] In some implementations, such as Figure 1 and Figure 2As shown, the electrode structure 300 also includes a harpoon portion 5, which is located at the head and tail ends of a single main grid 1. The harpoon portion 5 is a forked structure, and its shape is similar to a harpoon. By setting it in this way, the problem that the main grid 1 is too close to the edge of the battery cell 100, which makes it inconvenient to weld the battery cell 100, can be solved, and the possibility of the main grid 1 breaking at the head and tail ends due to uneven force after the battery cell 100 is laminated after welding can be reduced, thereby reducing the possibility of fragmentation.

[0069] Second, as Figure 4 As shown, the present application discloses a battery cell 100, which includes: a substrate 200 and an electrode structure 300. Since the battery cell 100 includes the electrode structure 300 of the first aspect, the battery cell 100 can reduce the amount of silver paste used for printing the metal electrode without reducing the width of the secondary grid 2 during the manufacturing process, increase the light receiving area of ​​the battery cell 100, and at the same time ensure the conversion efficiency of the battery cell 100.

[0070] There are many ways to implement the arrangement of the electrode structure 300 on the battery cell 100. For example, the electrode structure 300 can be arranged on the front side of the substrate 200 or on the back side of the substrate 200. In addition, the electrode structure 300 can be arranged on both the front side and the back side of the substrate 200. The electrode structure 300 arranged on both sides can increase more current collection paths and improve the current collection efficiency. And because the back side of the substrate 200 will receive a part of the reflected sunlight, the electrode structure 300 arranged on the back side can collect the current generated on the back side of the substrate 200. It should be noted that the number of electrode structures 300 arranged on the front side or the back side of the substrate 200 can be one or more, and multiple electrode structures 300 can increase the voltage of the battery cell 100.

[0071] In a third aspect, the present application discloses a photovoltaic module, including the cell 100 of the second aspect. By setting it in this way, the photovoltaic module can reduce the amount of silver paste used for printing metal electrodes without reducing the width of the secondary grid 2, increase the light receiving area of ​​the cell 100, and at the same time ensure the conversion efficiency of the cell 100, thereby increasing the benefits of the photovoltaic module.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An electrode structure, characterized in that: include: A main grid, wherein the number of the main grids is multiple, and the multiple main grids are arranged in parallel and at intervals; as well as A secondary grid, wherein the number of the secondary grids is multiple, the multiple secondary grids are arranged in parallel and at equal intervals, the multiple secondary grids intersect the multiple main grids vertically, at least one of the multiple secondary grids is partially disconnected to form at least one gap, the spacing between two adjacent secondary grids is D, and along the extension direction of the secondary grid, the length of the gap is d, wherein d≤D.

2. The electrode structure according to claim 1, characterized in that: The length d of the notch satisfies: 0.5 mm ≤ d ≤ D.

3. The electrode structure according to claim 2, characterized in that: There are multiple gaps, and the multiple gaps are evenly distributed in the electrode structure.

4. The electrode structure according to claim 3, characterized in that: The auxiliary grid includes a plurality of sub-auxiliary grids, wherein the sub-auxiliary grid is a portion between the intersections of the auxiliary grid and two adjacent main grids, and each of the sub-auxiliary grids is partially disconnected to form a gap.

5. The electrode structure according to claim 4, characterized in that: The gaps of the plurality of sub-grids located between adjacent main grids are aligned along the extension direction of the main grids.

6. The electrode structure according to claim 4, characterized in that: The electrode structure further comprises a plurality of anti-breakage grids. Along the extension direction of the main grid, one anti-breakage grid is connected between every two adjacent sub-grids.

7. The electrode structure according to claim 6, characterized in that: The two adjacent main grids include a first main grid and a second main grid, the two adjacent sub-grids include a first sub-grid and a second sub-grid, a first notch is formed on the first sub-grid to separate the first sub-grid into two endpoints, a second notch is formed on the second sub-grid to separate the second sub-grid into two endpoints, one end of the anti-break grid is connected to one of the endpoints of the first sub-grid, and the other end of the anti-break grid is connected to one of the endpoints of the second sub-grid.

8. The electrode structure according to claim 7, characterized in that: The first notch separates the first sub-grid into a first endpoint and a second endpoint, the second notch separates the second sub-grid into a third endpoint and a fourth endpoint, the second endpoint is located at the midpoint of the first sub-grid, the third endpoint is located at the midpoint of the second sub-grid, the anti-break grid connects the second endpoint and the third endpoint, the first notch is located on a side of the anti-break grid close to the first main grid, and the second notch is located on a side of the anti-break grid close to the second main grid.

9. A battery cell, characterized in that: include: substrate; as well as The electrode structure according to any one of claims 1 to 8, wherein the electrode structure is arranged on the front side and / or the back side of the substrate.

10. A photovoltaic module, characterized in that: Including the battery cell as claimed in claim 9.

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