Battery piece back-etching device
By using a re-etching device with upper and lower re-etching rollers arranged in parallel during photovoltaic cell production, the amount of re-etching liquid can be controlled to prevent the copper seed layer from being eroded. This solves the problem of poor re-etching effect, reduces the risk of grid breakage, and improves the quality of the cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TONGWEI SOLAR ENERGY (CHENGDU) CO LID
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-19
AI Technical Summary
In the existing technology, during the production of photovoltaic cells, the etching solution has a poor etching effect on the non-grid area of the copper seed layer, resulting in a reduction in the effective contact area between the grid line and the copper seed layer, which increases the risk of grid breakage.
The upper and lower back etching rollers are arranged side by side to form a back etching gap. The liquid supply system applies back etching liquid to the roller surface, so that the roller surface reacts with the non-gate area of the copper seed layer. The amount of back etching liquid is controlled to avoid the copper seed layer below the gate line being etched.
This improved the etch-back effect, reduced the risk of grid breakage, ensured sufficient contact area between the grid lines and the copper seed layer, and enhanced the quality of the solar cells.
Smart Images
Figure CN224265402U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic cell production equipment, and more specifically, to a cell re-etching device. Background Technology
[0002] Currently, in the production process of photovoltaic cells, after the grid lines are electroplated and formed, the semi-finished cells are usually immersed in a back-etching solution to etch back the non-grid line areas of the copper seed layer.
[0003] During this process, a large amount of etching solution will also etch the part of the copper seed layer at the bottom of the gate line, resulting in a poor etching effect. This leads to a reduction in the effective contact area between the gate line and the copper seed layer, resulting in a higher risk of gate breakage. Utility Model Content
[0004] The purpose of this invention is to provide a battery cell re-etching device that can achieve better re-etching results and reduce the risk of grid breakage.
[0005] The embodiments of this utility model provide a technical solution:
[0006] A battery cell re-etching device includes an upper re-etching roller, a lower re-etching roller, and a liquid supply system. The upper and lower re-etching rollers are arranged side by side and spaced apart in a first direction to form a re-etching gap. The upper and lower re-etching rollers are used to roll on opposite sides of the battery cell as the battery cell passes through the re-etching gap. The liquid supply system is used to apply re-etching liquid to the roller surfaces of the upper and lower re-etching rollers.
[0007] In an optional embodiment, there are multiple upper-return engraving rollers arranged side by side and sequentially in the second direction.
[0008] In an optional embodiment, the liquid supply system includes a dripping assembly positioned above the plurality of upper back-etching rollers, for dripping back-etching liquid onto the roller surfaces of the plurality of upper back-etching rollers after the back-etching liquid has been introduced.
[0009] In an optional embodiment, the dripping assembly includes a plurality of dripping tubes, which are aligned vertically with and arranged side by side with a plurality of upper-returning rollers. The lower surface of each dripping tube has a dripping port communicating with its interior.
[0010] In an optional embodiment, there are multiple back-tracking rollers arranged side by side and sequentially in the second direction.
[0011] In an optional embodiment, the liquid supply system further includes a spraying assembly for spraying the return ink onto the roller surfaces of the plurality of lower return ink rollers after the return ink is introduced.
[0012] In an optional embodiment, the spraying assembly includes a plurality of spray pipes, which are located below the plurality of lower return rollers and are aligned with and arranged side by side with the plurality of upper return rollers. The upper surface of each spray pipe has a spray port that communicates with its interior.
[0013] In an optional embodiment, the cell re-marking device further includes a drive mechanism, at least one of the upper re-marking roller and the lower re-marking roller being drive-connected to the drive mechanism for rotating under the drive mechanism to convey the cell through the re-marking gap.
[0014] In an optional embodiment, the upper and / or lower engraving rollers are coated with a flexible protective layer, and the liquid supply system is used to apply engraving fluid to the surface of the flexible protective layer.
[0015] Compared to existing technologies, the cell re-etching device provided by this invention applies re-etching fluid to the surfaces of the upper and lower re-etching rollers via a liquid supply system. As the cell passes through the re-etching gap between the upper and lower re-etching rollers, the rollers roll on opposite sides of the cell. The re-etching fluid on the roller surfaces reacts with the non-grid area of the copper seed layer. However, due to the limited amount of re-etching fluid on the roller surfaces and the obstruction of the grid lines preventing direct contact with the portion of the copper seed layer below the grid lines, the portion of the copper seed layer below the grid lines is not etched. Furthermore, the liquid supply system allows for precise control of the amount of re-etching fluid applied to the roller surfaces. Therefore, the beneficial effects of the cell re-etching device provided by this invention include: achieving better re-etching results and reducing the risk of grid breakage. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and therefore should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without any creative effort.
[0017] Figure 1 A schematic diagram of the battery cell re-etching device provided for an embodiment of this utility model from one perspective;
[0018] Figure 2 A schematic diagram of the structure of the battery cell re-etching device provided for an embodiment of this utility model from another perspective.
[0019] Icons: 100 - Cell re-engraving device; 110 - Upper re-engraving roller; 120 - Lower re-engraving roller; 130 - Re-engraving gap; 140 - Drip pipe; 141 - Drip outlet; 150 - Spray pipe; 151 - Spray outlet. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0024] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0026] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0027] Example
[0028] Please refer to the following: Figure 1 and Figure 2 , Figure 1 The diagram shown is a structural schematic of the battery cell re-etching device 100 provided in this embodiment from one perspective. Figure 2 The diagram shown is a structural schematic of the battery cell re-etching device 100 from another perspective.
[0029] The battery cell back-etching device 100 provided in this embodiment is used to back-etch semi-finished battery cells that have completed grid line electroplating, that is, to remove the non-grid line areas of the copper seed layer on both sides of the battery cell.
[0030] The cell re-etching device 100 includes an upper re-etching roller 110, a lower re-etching roller 120, and a liquid supply system. The upper re-etching roller 110 and the lower re-etching roller 120 are arranged side by side and spaced apart in a first direction to form a re-etching gap 130. The upper re-etching roller 110 and the lower re-etching roller 120 are used to roll on opposite sides of the cell during the process of the cell passing through the re-etching gap 130. The liquid supply system is used to apply re-etching liquid to the roller surfaces of the upper re-etching roller 110 and the lower re-etching roller 120.
[0031] Figure 2 The direction indicated by the X-arrow is the first direction. In this embodiment, the first direction is actually the vertical direction, with the upper engraving roller 110 positioned above the lower engraving roller 120, forming a horizontal engraving gap 130 between them. In another embodiment, depending on the actual application conditions, the first direction may also be any direction other than the vertical direction.
[0032] In practical applications, when it is necessary to re-etch the semi-finished battery cells, the battery cells are passed through the re-etching gap 130 between the upper re-etching roller 110 and the lower re-etching roller 120. During this process, the upper re-etching roller 110 rolls on the upper surface of the battery cells, and the lower re-etching roller 120 rolls on the lower surface of the battery cells.
[0033] Before and / or during the rolling of the upper and lower etching rollers 110 and 120, the liquid supply system applies etching fluid to the roller surfaces of the upper and lower etching rollers 110 and 120, so that the etching fluid on the roller surfaces of the upper and lower etching rollers 110 and 120 reacts in the non-gateline regions of the corresponding copper seed layer, thereby achieving etching of the non-gateline regions of the copper seed layer.
[0034] It should be noted that in practical applications, the liquid supply system can control the amount of etch fluid applied to the upper and lower etch rollers 110 and 120, preventing excessive etch fluid from causing erosion of the portion of the copper seed layer below the grid lines. Furthermore, during the rolling process of the upper and lower etch rollers 110 and 120, the grid lines prevent the roller surface from directly contacting the portion of the copper seed layer below the grid lines, further preventing erosion of this portion of the copper seed layer.
[0035] As can be seen, the cell re-etching device 100 provided in this embodiment can effectively prevent the portion of the copper seed layer below the grid line from being etched by the re-etching liquid, ensuring that the grid line and the copper seed layer have sufficient contact area, thereby reducing the risk of grid breakage and improving the quality of the cell.
[0036] In fact, in this embodiment, there are multiple upper-return engraving rollers 110 and multiple lower-return engraving rollers 120. Multiple upper-return engraving rollers 110 are arranged side by side and sequentially arranged in the second direction; multiple lower-return engraving rollers 120 are arranged side by side and sequentially arranged in the second direction.
[0037] The second direction is... Figure 2 In this embodiment, the second direction indicated by the Y-arrow is the horizontal direction. In fact, multiple upper back-etching rollers 110 arranged sequentially in the horizontal direction are above multiple lower back-etching rollers 120. The back-etching gaps 130 formed by the multiple upper back-etching rollers 110 and the multiple lower back-etching rollers 120 are connected to form a channel for the battery cells to pass through.
[0038] In practical applications, as the solar cell passes through the channel, multiple upper-returning rollers 110 roll over the upper surface of the solar cell in sequence, achieving multiple re-etching of the copper seed layer on the upper side of the solar cell; multiple lower-returning rollers 120 roll over the lower surface of the solar cell in sequence, achieving multiple re-etching of the copper seed layer on the lower side of the solar cell.
[0039] It should be noted that for solar cells with a copper seed layer on only one side, the copper seed layer on one side can be re-etched by controlling the liquid supply system to apply the re-etching liquid only to one of the upper re-etching roller 110 and the lower re-etching roller 120.
[0040] The battery cell re-marking device 100 provided in this embodiment also includes a drive mechanism (not shown in the figure). At least one of the upper re-marking roller 110 and the lower re-marking roller 120 is connected to the drive mechanism for rotation under the drive of the drive mechanism to transport the battery cell through the re-marking gap 130.
[0041] For example, only a plurality of the lower-return engraving rollers 120 may be connected to the drive mechanism, while the plurality of upper-return engraving rollers 110 may not be connected to the drive mechanism. In practical applications, the plurality of lower-return engraving rollers 120 rotate under the drive of the drive mechanism, thereby conveying the battery cells through the channel formed by the plurality of engraving gaps 130.
[0042] It is understandable that as the battery cell passes through the channel driven by the lower engraving roller 120, the upper engraving roller 110 will rotate under the influence of the battery cell, that is, it will roll relative to the upper surface of the battery cell, and the rotation direction of the upper engraving roller 110 is opposite to the rotation direction of the lower engraving roller 120.
[0043] As can be seen, the cell re-etching device 100 provided in this embodiment can not only re-etch semi-finished cells, but also transport them. In practical applications, the cell re-etching device 100 can be arranged between the film removal station and the light injection station on the production line. After the semi-finished cells have completed the film removal process at the film removal station, they are transported to the light injection station through the cell re-etching device 100, and the re-etching process is completed during the transport process, which can significantly improve the production efficiency of cells.
[0044] In this embodiment, the liquid supply system includes a dripping assembly located above a plurality of upper back-etching rollers 110, which is used to drip back-etching liquid onto the roller surface of the plurality of upper back-etching rollers 110 after the back-etching liquid is introduced.
[0045] In fact, the dripping assembly includes multiple dripping tubes 140, which are aligned vertically with and arranged side by side with multiple upper-returning rollers 110. The lower surface of the dripping tube 140 is provided with a dripping port 141 that communicates with its interior.
[0046] In practical applications, multiple drip tubes 140 are connected to a back-etching liquid supply source through pipelines. The back-etching liquid supply source inputs back-etching liquid into multiple drip tubes 140 through pipelines. The back-etching liquid entering each drip tube 140 is dripped onto the roller surface of the corresponding upper back-etching roller 110 through the drip outlet 141.
[0047] The liquid supply system also includes a spraying assembly, which sprays the return etching liquid onto the roller surfaces of multiple lower return etching rollers 120 after the return etching liquid is introduced. Specifically, the spraying assembly includes multiple spray pipes 150, which are located below the multiple lower return etching rollers 120 and are aligned and arranged side by side with the multiple upper return etching rollers 110. The upper surface of the spray pipes 150 has a spray port 151 that communicates with its interior.
[0048] In practical applications, multiple spray pipes 150 are connected to an external etch fluid supply source via pipelines. The etch fluid supply source supplies etch fluid into the multiple spray pipes 150 through pipelines. The etch fluid in each spray pipe 150 is then sprayed onto the roller surface of the corresponding lower etch roller 120 through spray nozzles 151. A pumping device can be configured on the pipelines to ensure that each spray pipe 150 has sufficient spray pressure.
[0049] It should be noted that in other embodiments, the liquid supply system may adopt other structures according to actual application conditions, and apply the return liquid to the upper return roller 110 and the lower return roller 120 with different principles, not limited to the dripping and spraying methods in this embodiment.
[0050] Furthermore, considering that the upper and lower etch rollers 110 and 120 may damage structures such as grid lines on the surface of the battery cell during their relative rolling motion on both sides of the cell, in another embodiment, a flexible protective layer can be applied to the rollers of both the upper and lower etch rollers 110 and 120, and a liquid supply system can be used to apply etch fluid to the surface of the flexible protective layer. Alternatively, both the upper and lower etch rollers 110 and 120 can be made of flexible materials, such as rubber.
[0051] In summary, the cell etching device 100 provided in this embodiment can etch the non-gateline area of the copper seed layer of the cell and avoid the portion of the copper seed layer below the gateline being etched, ensuring sufficient contact area between the gateline and the copper seed layer and reducing the risk of gate breakage.
[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A battery cell re-marking device, characterized in that, The device includes an upper back-etching roller (110), a lower back-etching roller (120), and a liquid supply system. The upper back-etching roller (110) and the lower back-etching roller (120) are arranged side by side and spaced apart in a first direction to form a back-etching gap (130). The upper back-etching roller (110) and the lower back-etching roller (120) are used to roll on opposite sides of the battery cell as the battery cell passes through the back-etching gap (130). The liquid supply system is used to apply back-etching liquid to the roller surfaces of the upper back-etching roller (110) and the lower back-etching roller (120).
2. The battery cell re-etching device according to claim 1, characterized in that, The number of the upper engraving rollers (110) is multiple, and the multiple upper engraving rollers (110) are arranged side by side and sequentially in the second direction.
3. The battery cell re-etching device according to claim 2, characterized in that, The liquid supply system includes a dripping assembly positioned above the plurality of upper return rollers (110) for dripping the return liquid onto the roller surfaces of the plurality of upper return rollers (110) after the return liquid is introduced.
4. The cell re-etching device according to claim 3, characterized in that, The dripping assembly includes multiple dripping tubes (140), which are aligned vertically with and arranged side by side with multiple upper-returning rollers (110). The lower surface of each dripping tube (140) has a dripping port (141) communicating with its interior.
5. The battery cell re-etching device according to claim 1, characterized in that, The number of the down-returning etching rollers (120) is multiple, and the multiple down-returning etching rollers (120) are arranged side by side and sequentially in the second direction.
6. The cell re-etching device according to claim 5, characterized in that, The liquid supply system also includes a spraying component, which is used to spray the return ink onto the roller surface of the plurality of lower return ink rollers (120) after the return ink is introduced.
7. The cell re-etching device according to claim 6, characterized in that, The spraying assembly includes multiple spray pipes (150), which are located below multiple lower return rollers (120) and aligned with and arranged side by side with multiple upper return rollers (110). The upper surface of each spray pipe (150) has a spray port (151) communicating with its interior.
8. The battery cell re-etching device according to claim 1, characterized in that, The cell back-marking device (100) further includes a drive mechanism, at least one of the upper back-marking roller (110) and the lower back-marking roller (120) is connected to the drive mechanism for rotation under the drive of the drive mechanism to transport the cell through the back-marking gap (130).
9. The battery cell re-etching device according to claim 1, characterized in that, The upper back-etching roller (110) and / or the lower back-etching roller (120) are covered with a flexible protective layer, and the liquid supply system is used to apply back-etching liquid to the surface of the flexible protective layer.