Battery electrode printing structure and solar battery

Abstract

The utility model relates to the field of solar cells, in particular to a cell electrode printing structure and a solar cell. The battery electrode printing structure comprises a main grid assembly which comprises a plurality of first main grid parts and a plurality of second main grid parts, the first main grid parts and the second main grid parts extend in the first direction, and the first main grid parts and the second main grid parts are alternately arranged at intervals in the second direction perpendicular to the first direction; the auxiliary grid assembly is in lap joint with the main grid assembly, the auxiliary grid assembly comprises a plurality of auxiliary grid parts, and the auxiliary grid parts extend in the second direction and are arranged at intervals in the first direction; wherein at least one of the first main grid part and the second main grid part is divided into multiple sections which are arranged at intervals in the first direction, and the projection of the first main grid part and the projection of the second main grid part in the second direction are connected with the projection of all the auxiliary grid parts in the second direction. According to the utility model, the efficiency of the battery can be improved while the silver consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the field of solar cells, in particular to a battery electrode printing structure and a solar cell. Background Art

[0002] Competition in the solar cell manufacturing industry is currently intensifying, and cost reduction and efficiency improvement are the main themes of the industry's development. The screen printing graphic structure design of the TOPCon (Tunnel Oxide Passivated Contact) battery manufacturing process is an important part of cost reduction and efficiency improvement. The current mainstream TOPCon battery screen graphic design mainly includes the main grid, auxiliary grid, welding pad, centipede foot and harpoon. The main grid line and the auxiliary grid are perpendicular to each other. The centipede foot is set at the overlap of the main grid and the auxiliary grid. There is a large welding pad at each end of the main grid. In addition, multiple smaller welding pads are set between the two ends of the main grid. At the same time, a harpoon line is set at the end of the main grid. The battery screen graphic consumes a lot of silver. At the same time, due to the obstruction of the above structure, the working area of ​​the battery is reduced, resulting in reduced battery efficiency. Utility Model Content

[0003] Based on this, the utility model provides a battery electrode printing structure, including:

[0004] a main gate assembly comprising a plurality of first main gate portions and a plurality of second main gate portions, wherein the first main gate portions and the second main gate portions extend along a first direction, and the first main gate portions and the second main gate portions are alternately arranged along a second direction perpendicular to the first direction; and

[0005] an auxiliary grid assembly, overlapped with the main grid assembly, the auxiliary grid assembly comprising a plurality of auxiliary grid portions, the auxiliary grid portions extending along the second direction and arranged at intervals along the first direction;

[0006] At least one of the first main gate portion and the second main gate portion is divided into multiple segments spaced apart along the first direction, and the projections of the first main gate portion and the second main gate portion along the second direction connect the projections of all the auxiliary gate portions along the second direction.

[0007] Furthermore, the first main gate portion includes two first end main gate segments spaced apart along the first direction and a plurality of first sub-main gate segments spaced apart in sequence between the two first end main gate segments; the second main gate portion includes two second end main gate segments spaced apart along the first direction and a plurality of second sub-main gate segments spaced apart in sequence between the two second end main gate segments; the two second end main gate segments are respectively arranged corresponding to the two first end main gate segments, and the first sub-main gate segments and the second sub-main gate segments are alternately arranged along the first direction.

[0008] Furthermore, each of the first end main gate segments is overlapped with at least three of the auxiliary gate portions, and each of the second end main gate segments is overlapped with at least two of the auxiliary gate portions.

[0009] Furthermore, each of the first main gate portions is connected to all the auxiliary gate portions respectively, and the second main gate portion includes two second end main gate segments spaced apart along the first direction, and the two second end main gate segments are respectively arranged corresponding to the two ends of the first main gate portion.

[0010] Furthermore, each of the second end main gate segments is overlapped with at least two of the auxiliary gate portions.

[0011] Furthermore, at least one end portion of the first main gate portion has a first solder pad, which is formed at the overlap of the first main gate portion and the auxiliary gate portion, and at least one end portion of the second main gate portion has a second solder pad, which is formed at the overlap of the second main gate portion and the auxiliary gate portion.

[0012] Furthermore, the length of the first pad is 0.9-1.1 mm and the width is 0.2-0.4 mm, and the length of the second pad is 0.9-1.1 mm and the width is 0.2-0.4 mm.

[0013] Furthermore, the width of the auxiliary gate portion is 10-12 μm.

[0014] Further, the number of the first main gate portions is equal to the number of the second main gate portions, and the number of the first main gate portions and the number of the second main gate portions are 8-12 respectively.

[0015] The present utility model also provides a solar cell, comprising a cell substrate, a front electrode and a back electrode, wherein the cell substrate has a front side and a back side arranged opposite to each other, the front electrode is arranged on the front side of the cell substrate, and the back electrode is arranged on the back side of the cell substrate, and at least one of the front electrode and the back electrode is any one of the above-mentioned cell electrode printing structures.

[0016] Compared with the prior art, the beneficial features of the present invention are: the battery electrode printing structure and the solar cell, the battery electrode printing structure includes a main grid assembly and a sub-grid assembly, the main grid assembly includes a plurality of first main grid portions and a plurality of second main grid portions, the first main grid portion and the second main grid portion extend along a first direction, and the first main grid portion and the second main grid portion are alternately spaced along a second direction perpendicular to the first direction; the sub-grid assembly is overlapped on the main grid assembly, the sub-grid assembly includes a plurality of sub-grid portions, the sub-grid portions extend along the second direction and are spaced apart along the first direction; wherein, at least one of the first main grid portion and the second main grid portion is divided into a plurality of segments spaced apart along the first direction, and the projections of the first main grid portion and the second main grid portion along the second direction are connected to the projections of all sub-grid portions along the second direction. Through the above method, at least one of the first main grid portion and the second main grid portion adopts a segmented design, and the union of the first main grid portion and the second main grid portion can be connected to all sub-grid portions to realize the collection of current, thereby reducing silver consumption while improving the efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the battery electrode printing structure of the utility model;

[0018] Figure 2 for Figure 1 A magnified view of the local A structure;

[0019] Figure 3 This is a schematic diagram of the battery electrode printing structure of the utility model;

[0020] Figure 4 for Figure 3 A magnified view of the local B structure;

[0021] Among them: 1-first main grid part (101-first end main grid segment, 102-first sub-main grid segment, 103-first welding pad, 104-first harpoon), 2-second main grid part (201-second end main grid segment, 202-second sub-main grid segment, 203-second welding pad, 204-second harpoon), 3-auxiliary grid part, 4-first centipede foot, 5-second centipede foot, 6-center line. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0023] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] Please refer to the figure, the battery electrode printing structure of the embodiment of the present invention includes a main grid assembly and a sub-grid assembly, and the main grid assembly includes a plurality of first main grid sections 1 and a plurality of second main grid sections 2. The first main grid section 1 and the second main grid section 2 extend along the first direction respectively, and the first main grid section 1 and the second main grid section 2 are alternately spaced along the second direction, and the second direction is perpendicular to the first direction. The sub-grid assembly is overlapped on the main grid assembly, and the sub-grid assembly includes a plurality of sub-grid sections 3, and the sub-grid sections 3 extend along the second direction, and all the sub-grid sections 3 are spaced along the first direction. Among them, at least one of the first main grid section 1 and the second main grid section 2 is divided into a plurality of sections spaced along the first direction, and the projections of the first main grid section 1 and the second main grid section 2 along the second direction connect the projections of all the sub-grid sections 3 along the second direction. In other words, the projection of the first main grid section 1 and any adjacent second main grid section 2 on the first plane is the first projection, wherein the first plane is perpendicular to the second direction, and the projection of each sub-grid section 3 on the first plane is the second projection, and the first projection can connect all the second projections together.

[0026] In an embodiment of the present invention, at least one of the first main gate portion 1 and the second main gate portion 2 adopts a segmented design, and the union of the first main gate portion 1 and the second main gate portion 2 can be connected to all the sub-gate portions 3 to realize the collection of current, thereby reducing silver consumption while reducing the obstruction of the battery by the battery electrode printing structure, increasing the working area of ​​the battery, thereby improving the efficiency of the battery and achieving cost reduction and efficiency improvement.

[0027] As an example, all first main gate portions 1 have the same structure. Accordingly, all second main gate portions 2 have the same structure.

[0028] In some preferred embodiments, please refer to Figure 1 and Figure 2, the first main gate portion 1 and the second main gate portion 2 are respectively divided into multiple segments spaced apart along the first direction. Specifically, the first main gate portion 1 includes a first end main gate segment 101 and a first sub-main gate segment 102. There are two first end main gate segments 101, and the two first end main gate segments 101 are spaced apart along the first direction and corresponding to the two ends of the first main gate portion 1. There are multiple first sub-main gate segments 102, and all first sub-main gate segments 102 are spaced apart between the two first end main gate segments 101 along the first direction. The second main gate portion 2 includes a second end main gate segment 201 and a second sub-main gate segment 202. There are two second end main gate segments 201, and the two second end main gate segments 201 are spaced apart along the first direction and corresponding to the two ends of the second main gate portion 2. There are multiple second sub-main gate segments 202, and all second sub-main gate segments 202 are spaced apart between the two second end main gate segments 201 along the first direction. One of the second end main gate segments 201 is arranged corresponding to one of the first end main gate segments 101, and another second end main gate segment 201 is arranged corresponding to another first end main gate segment 101. The first sub-main gate segments 102 and the second sub-main gate segments 202 are arranged alternately along the first direction. In addition, the projection of the first main gate portion 1 and any adjacent second main gate portion 2 on the first plane is a first projection, wherein the first plane is perpendicular to the second direction, and the projection of each sub-gate portion 3 on the first plane is a second projection, and the first projection can connect all the second projections together.

[0029] In this embodiment, both the first main gate 1 and the second main gate 2 are segmented, and their projections along the second direction form a complete main gate. In other words, the union of the first main gate 1 and the second main gate 2 can connect all the auxiliary gates 3, thereby achieving current collection. This embodiment not only reduces silver consumption but also reduces the obstruction of the battery by the printed battery electrode structure, increasing the battery's working area, thereby improving battery efficiency and achieving cost reduction and efficiency improvement.

[0030] In some more preferred embodiments, the first end main grid segment 101 and the second end main grid segment 201 can be used as a string welding positioner, and please refer to Figure 2 Each first end main grid segment 101 is overlapped with at least three auxiliary grid portions 3, and each second end main grid segment 201 is overlapped with at least two auxiliary grid portions 3, which can improve the welding tension.

[0031] For some examples, see Figure 2The first end main grid segment 101 is overlapped with four auxiliary grid sections 3, and the second end main grid segment 201 is overlapped with three auxiliary grid sections 3, which can not only improve the welding tension, but also effectively reduce the silver consumption. Moreover, the number of auxiliary grid sections 3 overlapped by the first end main grid segment 101 is different from the number of auxiliary grid sections 3 overlapped by the second end main grid segment 201, which is more convenient for alternatingly arranging the first sub-main grid segment 102 and the second sub-main grid segment 202 along the first direction. Moreover, each first sub-main grid segment 102 is overlapped with two adjacent auxiliary grid sections 3, and each second sub-main grid segment 202 is overlapped with two adjacent auxiliary grid sections 3. Not only is the structure simple and easy to produce, but it can also achieve cost reduction and efficiency improvement while effectively collecting current.

[0032] It should be noted that, in other embodiments, each first end main gate segment 101 can be overlapped with other numbers of auxiliary gate portions 3, each first sub-main gate segment 102 can be overlapped with other numbers of auxiliary gate portions 3, each second end main gate segment 201 can be overlapped with other numbers of auxiliary gate portions 3, and each second sub-main gate segment 202 can be overlapped with other numbers of auxiliary gate portions 3, which will not be repeated here.

[0033] In some preferred embodiments, please refer to Figure 3 and Figure 4 , each first main gate portion 1 is respectively connected to all the auxiliary gate portions 3, and each second main gate portion 2 includes two second end main gate segments 201 spaced apart along the first direction, that is, the first main gate portion 1 is a complete main gate, and the second main gate portion 2 is a segmented main gate. In addition, the two second end main gate segments 201 are respectively arranged corresponding to the two ends of the first main gate portion 1, and can be used as string welding positioning. The projection of the first main gate portion 1 and any adjacent second main gate portion 2 on the first plane is the first projection, wherein the first plane is perpendicular to the second direction, the projection of each auxiliary gate portion 3 on the first plane is the second projection, and the projection of the first main gate portion 1 on the first plane is the third projection. The first projection can connect all the second projections together. The third projection can also connect all the second projections together. As an example, the third projection can completely overlap with the first projection, and the length of the third projection and the first projection in the first direction can be equal. Alternatively, the third projection can partially overlap with the first projection, and the length of the first projection in the first direction is greater than the length of the third projection in the first direction. It can be set according to actual conditions and will not be elaborated here.

[0034] In some more preferred embodiments, please refer to Figure 4 Each second end main grid segment 201 is overlapped with at least two auxiliary grid portions 3, which can increase the welding tension.

[0035] For some examples, see Figure 4Each second end main grid segment 201 is overlapped with two auxiliary grid portions 3, which can not only improve the welding tension but also effectively reduce silver consumption.

[0036] It should be noted that, in other embodiments, each second end main gate segment 201 may be overlapped with other numbers of auxiliary gate portions 3 , which will not be described in detail here.

[0037] In some preferred embodiments, please refer to Figures 1 to 4 At least one end of the first main grid portion 1 has a first soldering pad 103. The first soldering pad 103 is formed at the overlap of the first main grid portion 1 and the auxiliary grid portion 3. The first soldering pad 103 can effectively increase the welding tension, thereby improving the product yield of the solar cell. Similarly, at least one end of the second main grid portion 2 has a second soldering pad 203. The second soldering pad 203 is formed at the overlap of the second main grid portion 2 and the auxiliary grid portion 3. The second soldering pad 203 can effectively increase the welding tension, thereby improving the product yield of the solar cell.

[0038] In some examples, the solar cell is a bisection cell, which includes two half-cell cells. The printed cell electrode structures of the two half-cell cells are arranged axially symmetrically about the center line 6 of the solar cell. Figure 1 and Figure 3 The first main grid portion 1 has only one first soldering pad 103, and the first soldering pad 103 is located at one end of the first main grid portion 1 close to the center line 6 of the solar cell. Figures 1 to 4 Similarly, the second main grid portion 2 has only one second soldering pad 203, and the second soldering pad 203 is located at one end of the second main grid portion 2 close to the center line 6 of the solar cell, please refer to Figures 1 to 4 shown.

[0039] In some more preferred embodiments, please refer to Figure 2 and Figure 4 As shown, the first pad 103 is a rectangular structure with a length of 0.9-1.1 mm and a width of 0.2-0.4 mm, which can ensure the welding tension and reduce the silver consumption as much as possible. Figure 2 and Figure 4 As shown, the second pad 203 is a rectangular structure. The length of the second pad 203 is 0.9-1.1 mm and the width is 0.2-0.4 mm, which can ensure the welding tension and reduce the silver consumption as much as possible.

[0040] In some preferred embodiments, please refer to Figure 2 and Figure 4The end of the first main grid 1 further comprises a first harpoon 104, which is located at one end of the first main grid 1 close to the center line 6 of the solar cell. Similarly, the end of the second main grid 2 further comprises a second harpoon 204, which is located at one end of the center line 6 of the solar cell of the second main grid.

[0041] In some preferred embodiments, please refer to Figure 2 and Figure 4 The first centipede foot 4 overlapping the first main grid portion 1 and the auxiliary grid portion 3 is provided at the overlap of the first main grid portion 1 and the auxiliary grid portion 3. Similarly, the second centipede foot 5 overlapping the second main grid portion 2 and the auxiliary grid portion 3 is provided at the overlap of the second main grid portion 2 and the auxiliary grid portion 3.

[0042] In some preferred embodiments, the width of the auxiliary grid portion 3 is 10-12 μm, which can further reduce the shading area of ​​the solar cell surface, allowing more solar energy to directly illuminate the effective photoelectric conversion area of ​​the cell, thereby improving the photoelectric conversion efficiency.

[0043] In some preferred embodiments, the number of the first main gate portions 1 is equal to the number of the second main gate portions 2 , and the number of the first main gate portions 1 and the second main gate portions 2 are 8-12, respectively, which can further enhance the current collection capability.

[0044] The solar cell of the embodiment of the present utility model includes a cell substrate, a front electrode and a back electrode. The cell substrate has a front side and a back side arranged opposite to each other. The front electrode is arranged on the front side of the cell substrate, and the back electrode is arranged on the back side of the cell substrate. At least one of the front electrode and the back electrode is any one of the above-mentioned cell electrode printed structures.

[0045] It should be noted that either the front electrode or the back electrode can be any of the above-mentioned printed battery structures, or both can be any of the above-mentioned printed battery structures. Furthermore, the structure of the front electrode and the back battery structure can be the same or different, and can be set according to actual conditions, which is not detailed here.

[0046] In some preferred embodiments, the battery substrate may be a silicon wafer.

[0047] As an example, the solar cell can be a two-piece cell. The solar cell includes two half-cell cells, and the battery electrode printing structures of the two half-cell cells are arranged in an axisymmetric manner about the center line 6 of the solar cell. Please refer to Figure 1 and Figure 3Each half-cell battery includes a battery substrate, a front electrode, and a back electrode. The battery substrate has a front and back surface that are oppositely disposed. The front electrode is disposed on the front surface of the battery substrate, and the back electrode is disposed on the back surface of the battery substrate. At least one of the front electrode and the back electrode is any of the above-mentioned battery electrode printed structures.

[0048] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0049] The above embodiments merely represent preferred implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery electrode printing structure, characterized in that: include: A main gate assembly includes a plurality of first main gate portions and a plurality of second main gate portions, wherein the first main gate portions and the second main gate portions extend along a first direction, and the first main gate portions and the second main gate portions are alternately arranged along a second direction perpendicular to the first direction; and an auxiliary grid assembly, overlapped with the main grid assembly, the auxiliary grid assembly comprising a plurality of auxiliary grid portions, the auxiliary grid portions extending along the second direction and arranged at intervals along the first direction; At least one of the first main gate portion and the second main gate portion is divided into multiple segments spaced apart along the first direction, and the projections of the first main gate portion and the second main gate portion along the second direction connect the projections of all the auxiliary gate portions along the second direction.

2. The battery electrode printing structure according to claim 1, characterized in that: The first main gate portion includes two first end main gate segments spaced apart along the first direction and a plurality of first sub-main gate segments spaced apart in sequence between the two first end main gate segments. The second main gate portion includes two second end main gate segments spaced apart along the first direction and a plurality of second sub-main gate segments spaced apart in sequence between the two second end main gate segments. The two second end main gate segments are respectively arranged corresponding to the two first end main gate segments, and the first sub-main gate segments and the second sub-main gate segments are alternately arranged along the first direction.

3. The battery electrode printing structure according to claim 2, wherein: Each of the first end main gate segments is overlapped with at least three of the auxiliary gate portions, and each of the second end main gate segments is overlapped with at least two of the auxiliary gate portions.

4. The battery electrode printing structure according to claim 1, wherein: Each of the first main gates is connected to all the auxiliary gates respectively. The second main gate includes two second end main gate segments spaced apart along the first direction. The two second end main gate segments are respectively arranged corresponding to two ends of the first main gate.

5. The battery electrode printing structure according to claim 4, characterized in that: Each of the second end main grid segments is overlapped with at least two of the auxiliary grid portions.

6. The battery electrode printing structure according to claim 1, wherein: At least one end portion of the first main gate portion has a first pad, which is formed at the overlap of the first main gate portion and the auxiliary gate portion. At least one end portion of the second main gate portion has a second pad, which is formed at the overlap of the second main gate portion and the auxiliary gate portion.

7. The battery electrode printing structure according to claim 6, characterized in that: The length of the first pad is 0.9-1.1 mm and the width is 0.2-0.4 mm. The length of the second pad is 0.9-1.1 mm and the width is 0.2-0.4 mm.

8. The battery electrode printing structure according to claim 1, wherein: The width of the auxiliary gate portion is 10-12 μm.

9. The battery electrode printing structure according to claim 1, wherein: The number of the first main gate portions is equal to the number of the second main gate portions, and the number of the first main gate portions and the number of the second main gate portions are 8-12 respectively.

10. A solar cell, characterized in that: The invention comprises a battery substrate, a front electrode and a back electrode, wherein the battery substrate has a front side and a back side arranged opposite to each other, the front electrode is arranged on the front side of the battery substrate, and the back electrode is arranged on the back side of the battery substrate, and at least one of the front electrode and the back electrode is a battery electrode printing structure as described in any one of claims 1 to 9.

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