Battery piece soldering flux coating device

Abstract

The invention relates to the technical field of battery piece production, and discloses a battery piece scaling powder coating device. The battery piece soldering flux coating device comprises a first coating mechanism and a second coating mechanism. The first coating mechanism comprises a base table and a plurality of first coating pieces arranged at intervals in the preset direction. The base station is provided with an inner cavity for containing scaling powder and a third surface facing the first surface. At least part of each first coating piece is embedded into the inner cavity from the third surface, and each first coating piece is used for adsorbing the scaling powder in the inner cavity and can move towards the first surface to coat the first main grid with the scaling powder. The second coating mechanism comprises a base and a plurality of second coating pieces arranged at intervals in the preset direction. The base is provided with a containing cavity for containing scaling powder and a fourth surface facing the second surface. According to the battery piece soldering flux coating device provided by the invention, the adverse effect on the battery piece can be reduced when the soldering flux is coated.

Description

Technical Field

[0001] This application relates to the technical field of solar cell production, and particularly to a flux coating device for solar cells. Background Art

[0002] With the continuous development of new energy technologies, the installed capacity of photovoltaic modules has also been continuously increasing. Photovoltaic modules can convert solar energy into electrical energy, thereby achieving power generation. Moreover, no polluting products are produced during the power generation process of photovoltaic modules, which is relatively friendly to the environment. Solar cells are an important part of photovoltaic modules and play a role in photovoltaic conversion. Solar cells will go through different processes during production, among which the string welding process is particularly important.

[0003] When performing string welding on solar cells, flux is used to improve the solderability during welding, increase the welding tensile force, and reduce the proportion of false soldering. However, the flux coating operation will have an adverse impact on solar cells. Therefore, how to reduce the adverse impact on solar cells during flux coating is an important issue. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a flux coating device for solar cells, which can help reduce the adverse impact on solar cells during flux coating.

[0005] To solve the above technical problems, the embodiments of this application provide a flux coating device for solar cells. The solar cell includes a first surface and a second surface that are oppositely arranged. The first surface has a plurality of first main grids, and the second surface has a plurality of second main grids. The flux coating device for solar cells includes a first coating mechanism and a second coating mechanism. The first coating mechanism includes a base and a plurality of first coating members spaced apart along a preset direction. The base is provided with an inner cavity for accommodating flux and a third surface facing the first surface. At least a part of each first coating member is embedded in the inner cavity from the third surface. Each first coating member is used to adsorb the flux in the inner cavity and can move towards the first surface to coat the flux onto the first main grids. The second coating mechanism includes a base and a plurality of second coating members spaced apart along a preset direction. The base is provided with a receiving cavity for accommodating flux and a fourth surface facing the second surface. At least a part of each second coating member is embedded in the receiving cavity from the fourth surface. Each second coating member is used to adsorb the flux in the receiving cavity and can move towards the second surface to coat the flux onto the second main grids.

[0006] The solder paste coating device provided by the embodiments of the present application includes a first coating mechanism and a second coating mechanism. The first coating mechanism includes a base and a plurality of first coating members, and the second coating mechanism includes a base and a plurality of second coating members. Flux can be accommodated inside both the base and the base. Both the first coating members and the second coating members can adsorb the flux and move toward the surface of the cell. When contacting the main grid electrode on the surface of the cell, the flux is coated onto the main grid of the cell, thereby realizing the transfer printing of the flux. By using the adsorption of the first coating members and the second coating members on the flux and their movement toward the surface of the cell, the flux coating operation on the main grid electrodes on different surfaces of the cell can be carried out, which can avoid contaminating the surface of the cell due to the spraying form that is inconvenient to control the coating position. It can also coat the flux on the main grid electrodes on both sides of the cell surface respectively. When coating the flux on the main grid electrodes on different surfaces of the cell, it is not necessary to flip the cell, thus avoiding the phenomenon of cell fragmentation caused by flipping.

[0007] In some embodiments, a plurality of placement areas are spaced on the third surface, each placement area is used to carry a cell, and each first coating member and each second coating member are arranged to extend along the distribution direction of the plurality of placement areas. In this way, by placing a plurality of cells on the surface of the base, the flux coating operation on a plurality of cells can be completed simultaneously.

[0008] In some embodiments, the base is provided with a plurality of first grooves, each first groove recesses inward from the third surface to communicate with the inner cavity. The plurality of first coating members correspond to the plurality of first grooves one by one, and each first coating member can enter / leave the inner cavity from the corresponding first groove. In this way, through the setting of the first groove, it is convenient for the first coating member to enter the inner cavity along the first groove and maintain the state of being immersed in the flux. And when leaving the inner cavity, the flux is coated on the main grid electrode on the surface of the cell.

[0009] In some embodiments, the first coating mechanism further includes a first connecting member and a second connecting member. The first connecting member and the second connecting member are arranged on opposite sides of the base away from each other. The plurality of first coating members are all connected to the first connecting member and the second connecting member, and at least one of the first connecting member and the second connecting member can move relative to the base to drive the plurality of first coating members to enter / leave the inner cavity. In this way, by setting different connecting members, while maintaining the shape of the first coating member, it is convenient to realize the movement of the first coating member.

[0010] In some embodiments, each first coating member surrounds the first connecting member and the second connecting member, and the first connecting member and the second connecting member can drive the plurality of first coating members to rotate. In this way, by the rotation of the connecting member, the rotation of the first coating member can be driven, and further the relative position transformation between the first coating member and the first groove can be realized.

[0011] In some embodiments, both the first connecting member and the second connecting member are provided with a plurality of annular grooves corresponding to the plurality of first coating members one by one, and each first coating member is embedded in the corresponding annular groove. In this way, the position of the first coating member can be limited by the annular groove.

[0012] In some embodiments, the base is provided with a plurality of second grooves, each second groove recesses inward from the fourth surface to communicate with the accommodating cavity, and the plurality of second coating members correspond to the plurality of second grooves one by one, and a part of each second coating member is fixed in the second groove. In this way, through the second groove, the second coating member can be embedded inside the base and remain in a state of being immersed in the solder flux.

[0013] In some embodiments, the base platform is provided with a first liquid injection port communicating with the inner cavity, and a first plugging member for closing / opening the first liquid injection port; the base is provided with a second liquid injection port communicating with the accommodating cavity, and a second plugging member for closing / opening the second liquid injection port. In this way, through the setting of the plugging member, it is convenient to supplement the solder flux.

[0014] In some embodiments, the projection of each first coating member on the third surface corresponds to the projection of each second coating member on the third surface one by one, and they have the same extension length in the direction perpendicular to the preset direction. In this way, by controlling the number and extension length of the first coating member and the second coating member, it can be consistent with the number of main grid electrodes on the front and back of the battery cell, and simultaneously realize the solder flux coating on multiple main grid electrodes on the surface of the battery cell.

[0015] In some embodiments, the width of each second coating member gradually decreases in the direction approaching the third surface. In this way, by making the second coating member form a shape with a continuously decreasing width towards the end, it is beneficial for the solder flux to penetrate towards the end of the second coating member. Description of the Drawings

[0016] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0017] Figure 1 is a three-dimensional structural schematic diagram of the first coating mechanism in the battery cell solder flux coating device provided by some embodiments of the present application;

[0018] Figure 2 is Figure 1 the enlarged structural schematic diagram at A in

[0019] Figure 3It is a three-dimensional structural schematic diagram of the base of the first coating mechanism in the battery wafer flux coating device provided by some embodiments of the present application;

[0020] Figure 4 It is a top-view structural schematic diagram of the base of the first coating mechanism in the battery wafer flux coating device provided by some embodiments of the present application;

[0021] Figure 5 Is Figure 4 The cross-sectional structural schematic diagram in the B-B direction in;

[0022] Figure 6 Is Figure 5 The enlarged structural schematic diagram at C in;

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the second coating mechanism in the battery wafer flux coating device provided by some embodiments of the present application;

[0024] Figure 8 It is a side-view structural schematic diagram of the base of the second coating mechanism in the battery wafer flux coating device provided by some embodiments of the present application;

[0025] Figure 9 Is Figure 8 The cross-sectional structural schematic diagram in the D-D direction in;

[0026] Figure 10 It is a structural schematic diagram of the first coating mechanism in the battery wafer flux coating device provided by some embodiments of the present application when a battery wafer is placed;

[0027] Figure 11 It is a structural schematic diagram of a battery wafer in the prior art. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will elaborate on the various embodiments of the present application in conjunction with the drawings. However, those of ordinary skill in the art can understand that in the various embodiments of the present application, many technical details are presented for the convenience of readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required to be protected by the present application can still be implemented. The following division of each embodiment is for convenience of description and should not constitute any limitation on the specific implementation manner of the present application. The various embodiments can be combined and cross-referenced with each other on the premise of not conflicting.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0031] In the process of manufacturing photovoltaic modules, the string soldering process of solar cells is particularly important. With the continuous development of photovoltaic power generation technology, "de-silvering" has become an important direction for the development of solar cells. However, the metal copper electrodes formed on the "de-silvered" solar cells through electroplating copper process are prone to oxidation when exposed to air, and it is necessary to coat flux on the electrode area on the surface of the solar cell during the soldering process of the solar cell to remove the oxide layer on the copper-plated surface. Thereby improving the solderability of the solar cell, increasing the soldering tensile force, and reducing the proportion of false soldering.

[0032] For conventional silver grid line solar cells, flux is also coated on the electrode area on the surface of the solar cell during the string soldering process, which can reduce the false soldering of the solar cell, lower the soldering temperature of the soldering machine, reduce the problem of broken grid lines of the solar cell, and improve the power of the photovoltaic module.

[0033] However, the flux coating device for conventional solar cells is realized by a spraying device, and the valve body is used to control the spraying of the flux. This makes it difficult to control the coating amount of the flux, and it is relatively difficult to accurately align and spray the flux onto the main grid electrode on the surface of the solar cell. The spraying process of the flux will be affected by air flow or nozzles, etc., and it is impossible to avoid the phenomenon of flux splashing. A large amount of splashed flux liquid will contaminate the surface of the solar cell. Moreover, the conventional flux spraying device can only spray flux on the unobstructed surface of the solar cell facing upward. When spraying flux onto the main grid electrode on the other surface of the solar cell, the solar cell needs to be turned over. However, due to the relatively fragile structure of the solar cell itself, the solar cell will be fragmented during the turning process, increasing the fragmentation rate of the solar cell.

[0034] In order to reduce the adverse effects on the solar cell during flux coating, some embodiments of the present application provide a flux coating device for solar cells. The flux coating device for solar cells adopts a transfer printing mode for flux coating. A component that can adsorb the flux is used to transfer and print the flux onto the main grid electrodes on the surface of the solar cell. The coating amount of the flux can be effectively controlled, and the splashing of the flux to pollute the surface of the solar cell can be avoided. At the same time, there is no need to flip the solar cell, and the main grid electrodes on both surfaces of the solar cell can be directly coated with flux through the transfer printing component. Thus, the phenomenon of fragmentation of the solar cell due to flipping can be avoided.

[0035] The following will Figures 1 to 10 describe the structure of the flux coating device for solar cells provided by some embodiments of the present application. Among them, as Figure 11 shown, the solar cell 21 to be coated with flux includes a first surface 211 and a second surface 212 that are oppositely arranged. The first surface 211 has a plurality of first main grids 201, and the second surface 212 has a plurality of second main grids 202.

[0036] As Figures 1 to 10 shown, the flux coating device for solar cells provided by some embodiments of the present application includes a first coating mechanism 11 and a second coating mechanism 12. The first coating mechanism 11 includes a base 111 and a plurality of first coating members 112 that are spaced apart along a preset direction. The base 111 is provided with an inner cavity 1101 for accommodating the flux, and a third surface 1111 facing the first surface 211. At least a part of each first coating member 112 is embedded in the inner cavity 1101 from the third surface 1111. Each first coating member 112 is used to adsorb the flux in the inner cavity 1101 and can move towards the first surface 211 to coat the flux onto the first main grid 201. The second coating mechanism 12 includes a base 121 and a plurality of second coating members 122 that are spaced apart along a preset direction. The base 121 is provided with a receiving cavity 1201 for accommodating the flux, and a fourth surface 1211 facing the second surface 212. At least a part of each second coating member 122 is embedded in the receiving cavity 1201 from the fourth surface 1211. Each second coating member 122 is used to adsorb the flux in the receiving cavity 1201 and can move towards the second surface 212 to coat the flux onto the second main grid 202.

[0037] The first coating mechanism 11 and the second coating mechanism 12 are sequentially arranged in a direction perpendicular to the plane where the battery cell 21 is located, corresponding to the flux coating mechanism for the main grid on the front side of the battery cell 21 and the flux coating mechanism for the main grid on the back side of the battery cell 21 respectively. The first surface 211 of the battery cell 21 is one of the front side and the back side of the battery cell 21, and the second surface 212 of the battery cell 21 is the other of the front side and the back side of the battery cell 21. For example, the first surface 211 can be the front side of the battery cell 21, and the second surface 212 is the back side of the battery cell 21. The first main grid 201 is the main grid on the front side of the battery cell 21, and the second main grid 202 is the main grid on the back side of the battery cell 21. The number of the first main grid 201 and the second main grid 202 is multiple, such as 3, 9, 12, 13 or 15.

[0038] When performing the flux coating operation on the battery cell 21, the first coating mechanism 11 is located on one side of the battery cell 21, and the second coating mechanism 12 is located on the other side of the battery cell 21. The battery cell 21 can be supported on the production line, and the first main grid 201 on the first surface 211 and the second main grid 202 on the second surface 212 are exposed. The battery cell 21 can also be directly placed on the first coating mechanism 11. The first surface 211 of the battery cell 21 faces the first coating mechanism 11, and the second surface 212 of the battery cell 21 faces the second coating mechanism 12, and the flux coating operation can be completed synchronously or step by step.

[0039] The first coating mechanism 11 includes a base 111 having an inner cavity 1101 and a plurality of first coating members 112. The inner cavity 1101 of the base 111 can provide a containing space for the flux, and the flux can be pre-filled inside the base 111. The plurality of first coating members 112 are arranged at intervals along a preset direction, and the preset direction is the arrangement direction of the main grid electrodes on the surface of the battery cell 21. The plurality of first coating members 112 correspond to the plurality of first main grids 201 on the first surface 211 of the battery cell 21. At least part of each first coating member 112 is embedded in the inner cavity 1101 of the base 111, can soak the flux and adsorb the flux. When the first coating member 112 contacts the first main grid 201 on the first surface 211 of the battery cell 21, the adsorbed flux will be transferred to the first main grid 201 to complete the transfer printing of the flux.

[0040] The second coating mechanism 12 includes a base 121 having a receiving cavity 1201 and a plurality of second coating members 122. The receiving cavity 1201 of the base 121 can provide a receiving space for the solder flux, and the solder flux can be pre-filled inside the base 121. The plurality of second coating members 122 are arranged at intervals along a preset direction, which is the arrangement direction of the main grid electrodes on the surface of the battery cell 21. The plurality of second coating members 122 correspond to the plurality of second main grids 202 on the second surface 212 of the battery cell 21. At least a part of each second coating member 122 is embedded in the receiving cavity 1201 of the base 121, and can soak the solder flux and adsorb the solder flux. When the second coating member 122 contacts the second main grid 202 on the second surface 212 of the battery cell 21, the adsorbed solder flux will be transferred to the second main grid 202 to complete the transfer printing of the solder flux.

[0041] The solder flux coating device for battery cells provided in some embodiments of the present application includes a first coating mechanism 11 and a second coating mechanism 12. The first coating mechanism 11 includes a base 111 and a plurality of first coating members 112, and the second coating mechanism 12 includes a base 121 and a plurality of second coating members 122. The base 111 and the base 121 can both accommodate the solder flux inside. The first coating members 112 and the second coating members 122 can both adsorb the solder flux and move towards the surface of the battery cell 21. When contacting the main grid electrodes on the surface of the battery cell 21, the solder flux is coated onto the main grid of the battery cell, thereby realizing the transfer printing of the solder flux. By using the adsorption of the solder flux by the first coating members 112 and the second coating members 122 and the movement towards the surface of the battery cell 21, the solder flux coating operation of the main grid electrodes on different surfaces of the battery cell 21 is carried out, which can avoid polluting the surface of the battery cell 21 due to the spraying form with inconvenient control of the coating position. It can also respectively coat the solder flux on the main grid electrodes on both sides of the battery cell 21. When coating the solder flux on the main grid electrodes on different surfaces of the battery cell 21, there is no need to flip the battery cell 21, thereby avoiding the fragmentation of the battery cell 21 due to flipping.

[0042] In some embodiments, a plurality of placement areas 1112 can be arranged at intervals on the third surface 1111 of the base 111. Each placement area 1112 is used to carry the battery cell 21, and each first coating member 112 and each second coating member 122 extend along the distribution direction of the plurality of placement areas 1112.

[0043] That is to say, the solar cell 21 to be coated with flux can be placed on the third surface 1111 of the base 111. The third surface 1111 of the base 111 is provided with a plurality of placement areas 1112, which can carry a relatively large number of solar cells 21 and perform flux coating operations simultaneously. Different solar cells 21 can be respectively placed in different placement areas 1112, so that the extending directions of the main grid electrodes of the plurality of solar cells 21 are consistent with the extending directions of the first coating member 112 and the second coating member 122. And each first coating member 112 corresponds to the main grid electrodes located on the same straight line on the surfaces of a plurality of solar cells 21 for flux coating. Thus, the flux coating of a plurality of main grid electrodes on the surface of the solar cell 21 is completed at one time by using a plurality of first coating members 112 and a plurality of second coating members 122.

[0044] As Figures 3 to 6 shown, the base 111 of the first coating mechanism 11 can be provided with a plurality of first grooves 1102. Each first groove 1102 is recessed from the third surface 1111 inward to communicate with the inner cavity 1101. The plurality of first coating members 112 correspond to the plurality of first grooves 1102 one by one, and each first coating member 112 can enter / leave the inner cavity 1101 from the corresponding first groove 1102.

[0045] The first grooves 1102 provided on the base 111 are used to provide a passage for the first coating member 112 to enter the interior of the base 111. The first grooves 1102 are recessed from the surface of the base 111 inward and are in a through state with the inner cavity 1101 of the base 111. The first grooves 1102 are correspondingly arranged with the first coating members 112. Each first coating member 112 can be inserted into the inner cavity 1101 of the base 111 from the corresponding first groove 1102 to adsorb the flux contained in the inner cavity 1101 of the base 111.

[0046] Each first coating member 112 can enter or leave the inner cavity 1101 of the base 111 through the channels formed by the corresponding first grooves 1102. When applying flux to the main grid electrodes on the surface of the battery cell 21, the first coating member 112 can first enter the inner cavity 1101 of the base 111 through the corresponding first grooves 1102 and adsorb the flux contained in the inner cavity 1101. After the first coating member 112 adsorbs the flux and the battery cell 21 is in place, the movement of the first coating member 112 towards the surface of the battery cell 21 can be controlled. The first coating member 112 will leave the inner cavity 1101 of the base 111 until it contacts the main grid electrodes on the surface of the battery cell 21. At this time, the flux adsorbed by the first coating member 112 will be applied to the positions of the main grid electrodes on the surface of the battery cell 21. After the flux application process is completed, the movement of the first coating member 112 back to its initial position can be controlled to facilitate the next flux application process. In actual situations, the cross-section of the first groove 1102 can be trapezoidal, so that the width of the second groove 1102 gradually increases in the direction away from the third surface 1111, in order to ensure the flux filling amount at the bottom of the second groove 1102 and ensure the wetting effect on the second coating member 112.

[0047] By controlling the movement of the first coating member 112 independently, not only can the flux application process be successfully completed, but also the base 111 can be used to carry the battery cell 21 on its surface, providing a placement basis for the flux application operation on the battery cell 21. When the battery cell 21 is placed on the third surface 1111 of the base 111, the position of the battery cell 21 can be pre-positioned to ensure that the main grid electrodes on the back of the battery cell 21 correspond to the positions of the first grooves 1102 of the base 111. Thus, the accuracy of the flux application by the first coating member 112 can be ensured.

[0048] In addition, the first coating mechanism 11 can also include a first connecting member 113 and a second connecting member 114. The first connecting member 113 and the second connecting member 114 are arranged on opposite sides of the base 111 away from each other. A plurality of first coating members 112 are all connected to the first connecting member 113 and the second connecting member 114. At least one of the first connecting member 113 and the second connecting member 114 can move relative to the base 111 to drive the plurality of first coating members 112 to enter / leave the inner cavity 1101.

[0049] The first connecting member 113 and the second connecting member 114 play a connecting role and provide a connecting basis for a plurality of first coating members 112. The first connecting member 113 and the second connecting member 114 are distributed on opposite sides of the base 111, and can position a plurality of first coating members 112 without interfering with the solar cell 21. Each first coating member 112 can be connected to the first connecting member 113 and the second connecting member 114 at different positions respectively. On the one hand, it ensures the shape stability of the first coating member 112. On the other hand, without interfering with the base 111, it drives a plurality of first coating members 112 to move. So as to drive a plurality of first coating members 112 to enter or leave the inner cavity 1101 of the base 111 and transform between the state of adsorbing the flux and the state of coating the flux on the main grid electrode on the surface of the solar cell 21.

[0050] As Figure 1 and Figure 2 shown, each first coating member 112 can be arranged around the first connecting member 113 and the second connecting member 114, and the first connecting member 113 and the second connecting member 114 can drive a plurality of first coating members 112 to rotate.

[0051] That is, each first coating member 112 is arranged in a circle around different connecting members, and the whole forms a closed ring. The distance between the first connecting member 113 and the second connecting member 114 can be adjusted to straighten and tighten the first coating member 112. By driving a plurality of first coating members 112 to rotate, the part of the first coating member 112 corresponding to the first groove 1102 can be adjusted, and the part of the first coating member 112 for adsorbing and coating the flux can be changed. The part of the first coating member 112 outside the first groove 1102 can also be cleaned to avoid contamination of the flux.

[0052] In actual situations, the first coating member 112 can be set to be strip-shaped, and the cross-section of the first coating member 112 can be set to regular shapes such as circular, rectangular or square, or can also be set to irregular shapes. The first coating member 112 as a whole can also be set to a non-closed straight line shape. The first coating member 112 can only extend to the positions of the first connecting member 113 and the second connecting member 114, or can extend a certain distance beyond the positions of the first connecting member 113 and the second connecting member 114.

[0053] In some embodiments, both the first connecting member 113 and the second connecting member 114 can be provided with a plurality of annular grooves 115 corresponding to a plurality of first coating members 112 one by one, and each first coating member 112 is embedded in the corresponding annular groove 115.

[0054] The annular groove 115 can limit the position of the first coating member 112 to ensure that the first coating member 112 is always in a position corresponding to the first groove 1102, thereby ensuring the accuracy of the flux coating by the first coating member 112.

[0055] As Figures 7 to 9 shown, the base 121 of the second coating mechanism 12 may be provided with a plurality of second grooves 1202. Each second groove 1202 is recessed inward from the fourth surface 1211 to communicate with the accommodation cavity 1201. A plurality of second coating members 122 correspond to the plurality of second grooves 1202 one by one, and a part of each second coating member 122 is fixed in the second groove 1202.

[0056] The second groove 1202 provided in the base 121 is used to provide a passage for the second coating member 122 to enter the interior of the base 121. The second groove 1202 is recessed inward from the surface of the base 121 and remains in a through state with the accommodation cavity 1201 of the base 121. The second groove 1202 is correspondingly arranged with the second coating member 122. Each second coating member 122 can be inserted into the accommodation cavity 1201 of the base 121 from the corresponding second groove 1202 to adsorb the flux accommodated in the accommodation cavity 1201 of the base 121.

[0057] A part of each second coating member 122 is fixed in the corresponding second groove 1202 to be inserted into the interior of the base 121 and immersed in the flux accommodated in the interior of the base 121. After the battery chip 21 is in place, when flux is coated on the main grid electrode on the surface of the battery chip 21, the second coating member 122 can move along with the base 121 until it comes into contact with the grid line electrode on the surface of the battery chip 21. The flux accommodated in the accommodation cavity 1201 of the base 121 will be transferred to the grid line electrode on the surface of the battery chip 21 along the second coating member 122. After the flux coating process is completed, the base 121 can be controlled to return to the initial position, so that the second coating member 122 leaves the surface of the battery chip 21 for the next flux coating process.

[0058] As Figure 6 shown, the base platform 111 may be provided with a first liquid injection port 1103 communicating with the inner cavity 1101 and a first plugging member 1104 for closing / opening the first liquid injection port 1103; as Figure 9 shown, the base 121 may be provided with a second liquid injection port 1203 communicating with the accommodation cavity 1201 and a second plugging member 1204 for closing / opening the second liquid injection port 1203.

[0059] The liquid injection port facilitates the replenishment of the soldering flux. After the soldering flux contained in the inner cavity 1101 of the base 111 is consumed, the first plug 1104 blocking the first liquid injection port 1103 can be removed to open the first liquid injection port 1103. The soldering flux is replenished into the inner cavity 1101 of the base 111 through the channel formed by the first liquid injection port 1103. After the replenishment of the soldering flux is completed, the first plug 1104 is connected again to close the first liquid injection port 1103, preventing the leakage of the soldering flux.

[0060] After the soldering flux contained in the accommodation cavity 1201 of the base 121 is consumed, the second plug 1204 blocking the second liquid injection port 1203 can be removed to open the second liquid injection port 1203. The soldering flux is replenished into the accommodation cavity 1201 of the base 121 through the channel formed by the second liquid injection port 1203. After the replenishment of the soldering flux is completed, the second plug 1204 is connected again to close the second liquid injection port 1203.

[0061] In actual situations, the position of the liquid injection port can be set as required. For example, the first liquid injection port 1103 can be set on the side or top of the base 111, and the second liquid injection port 1203 can be set on the side or top of the base 121. The number of liquid injection ports can be set to one or more. For example, the first liquid injection port 1103 can be set to one, two, three, or four, and the second liquid injection port 1203 can be set to one, two, three, or four.

[0062] As Figures 3 to 6 shown, multiple first channels are arranged at intervals inside the base 111 of the first coating mechanism 11 to form the inner cavity 1101 for accommodating the soldering flux. The extending direction of each first channel is perpendicular to the arrangement direction of the multiple first coating members 112 and is in communication with the multiple first grooves 1102. Both ends of each first channel are penetrated to form the first liquid injection port 1103. When the first coating member 112 enters the first groove 1102, the soldering flux stored in each first channel can infiltrate the multiple first coating members 112, penetrate the multiple first coating members 112 along the extending direction of each first coating member 112, and transfer to the main grid electrode on the surface of the battery cell 21 when the first coating member 112 leaves the first groove 1102 and contacts the surface of the battery cell 21.

[0063] In actual situations, the inner cavity 1101 inside the base 111 can also be continuously arranged, that is, a complete cavity structure is formed inside the base 111, and the projection of the cavity structure on the third surface 1111 of the base 111 covers the multiple battery cells 21, so as to ensure the filling amount of the soldering flux inside the base 111.

[0064] As Figures 7 to 9As shown in the figure, multiple second channels are arranged at intervals inside the base 121 of the second coating mechanism 12 to form a receiving cavity 1201 for receiving the solder flux. The extending direction of each second channel is perpendicular to the arrangement direction of the multiple second coating members 122 and is in communication with the multiple second grooves 1202. Both ends of each second channel are provided with through holes to form second liquid injection ports 1203. The solder flux stored in each second channel can infiltrate the multiple second coating members 122, penetrate the multiple second coating members 122 along the extending direction of each second coating member 122, and transfer to the main grid electrodes on the surface of the battery cell 21 when the second coating member 122 contacts the surface of the battery cell 21.

[0065] In actual situations, the receiving cavity 1201 inside the base 112 can also be continuously arranged, that is, a complete cavity structure is formed inside the base 112, so that the projection of the cavity structure on the fourth surface 1211 of the base 112 covers the multiple battery cells 21. This is to ensure the filling amount of the solder flux inside the base 112.

[0066] In some embodiments, the projection of each first coating member 112 on the third surface 1111 can correspond one-to-one with the projection of each second coating member 122 on the third surface 1111, and they have the same extending length in the direction perpendicular to the preset direction.

[0067] The number of the first coating members 112 and the second coating members 122 is the same as that of the main grid electrodes on the surface of the battery cell 21. The multiple first coating members 112 can be used to coat the solder flux on the multiple main grid electrodes of the battery cell 21 located on the first surface 211, and the multiple second coating members 122 can be used to coat the solder flux on the multiple main grid electrodes of the battery cell 21 located on the second surface 212. Thus, the solder flux coating of the multiple main grid electrodes on the surface of the battery cell 21 is completed synchronously. Moreover, the first coating member 112 and the second coating member 122 have substantially the same extending length, which is greater than the extending length of the main grid electrodes on the surface of the battery cell 21. This can complete the solder flux coating on each main grid electrode at one time.

[0068] In addition, each first coating member 112 can be set in a strip shape, and the thickness of each first coating member 112 in the preset direction remains the same in the direction perpendicular to the preset direction. For example, when the cross-sectional shape of each first coating member 112 is set to a circle, the diameter of each first coating member 112 can be kept the same.

[0069] As Figure 9 shown in the figure, in order to facilitate the penetration of the solder flux, the width of each second coating member 122 in the preset direction can be gradually reduced towards the direction close to the third surface 1111.

[0070] That is, the cross-section of each second coating member 122 forms a trapezoidal shape that is wider at the top and narrower at the bottom. When applying flux to the main grid electrodes on the surface of the battery cell 21, the second coating mechanism 12 is located above the battery cell 21, which can cause the flux to continuously move towards the end of the second coating member 122 away from the third surface 1111 under the action of gravity. In order to achieve the penetration of the flux on the second coating member 122 and ensure the flux coating effect on the main grid electrodes on the surface of the battery cell 21 when the second coating member 122 contacts the surface of the battery cell 21.

[0071] In actual situations, both the first coating member 112 and the second coating member 122 can be made of fiber materials with porous surfaces, and the capillary action of the porous fibers or synthetic fibers can be used to transfer-print the flux onto the grid electrodes on the surface of the battery cell 21. The flux coating device provided in some embodiments of the present application uses movable transfer-printing components on both side surfaces of the battery cell 21 to apply the adsorbed flux onto the main grid electrodes on the surface of the battery cell 21. The battery cell flux coating device can be mounted on the loading stage of the string welding machine. After the battery cell 21 is scribed and the moisture on the surface of the battery cell 21 is dried, the flux is applied before the battery cell 21 is positioned and grabbed. As Figure 10 shown, three battery cells 21 can be placed on the surface of the base 111 of the first coating mechanism 11 at the same time. Before starting to apply the flux, the battery cells 21 can be regularized to position the battery cells 21. The battery cell flux coating device can apply flux to the main grid electrodes on the front and back surfaces of the battery cell 21 at the same time. The battery cell flux coating device can supplement the flux through the side openings of the base 111 or the base 121 to ensure the automation of flux printing. The entire-surface printing fiber strip can be aligned with the grid electrodes of the battery cell 21 for transfer-printing of the flux, and the flux adsorption can be carried out inside the base 111 or the base 121 that accommodates the flux. By applying flux to the grid electrodes on the surface of the battery cell 21, the virtual soldering of the battery string can be reduced, the welding tensile force can be increased, the welding wettability can be improved, and the welding temperature can be reduced.

[0072] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes can be made to them in form and details without departing from the spirit and scope of the present application.

Claims

1. A solder flux coating device for solar cells, the solar cells including a first surface and a second surface which are oppositely arranged, the first surface having a plurality of first main grids, and the second surface having a plurality of second main grids, characterized in that, Comprising: A first coating mechanism, including a base and a plurality of first coating members spaced along a preset direction. The base is provided with an inner cavity for accommodating flux, and a third surface facing the first surface. At least a part of each first coating member is embedded into the inner cavity from the third surface. Each first coating member is used for adsorbing the flux in the inner cavity and can move towards the first surface to coat the flux onto the first main grid; A second coating mechanism, including a base and a plurality of second coating members spaced along the preset direction. The base is provided with a receiving cavity for accommodating flux, and a fourth surface facing the second surface. At least a part of each second coating member is embedded into the receiving cavity from the fourth surface. Each second coating member is used for adsorbing the flux in the receiving cavity and can move towards the second surface to coat the flux onto the second main grid.

2. The battery chip soldering flux coating device according to claim 1, wherein, A plurality of placement areas are spaced on the third surface. Each placement area is used for carrying the battery cell. Each first coating member and each second coating member are arranged to extend along the distribution direction of the plurality of placement areas.

3. The solder flux coating device for battery chips according to claim 1, wherein The base is provided with a plurality of first grooves, each first groove recessed inward from the third surface to communicate with the inner cavity. The plurality of first coating members correspond to the plurality of first grooves one by one, and each first coating member can enter / leave the inner cavity from the corresponding first groove.

4. The battery cell soldering flux coating device according to claim 3, characterized in that, The first coating mechanism further includes a first connecting member and a second connecting member. The first connecting member and the second connecting member are arranged on opposite sides of the base away from each other. The plurality of first coating members are all connected to the first connecting member and the second connecting member. At least one of the first connecting member and the second connecting member can move relative to the base to drive the plurality of first coating members to enter / leave the inner cavity.

5. The battery cell soldering flux coating device according to claim 4, characterized in that Each first coating member surrounds the first connecting member and the second connecting member. The first connecting member and the second connecting member can drive the plurality of first coating members to rotate.

6. The solder flux coating device for battery chips according to claim 5, wherein, Both the first connecting member and the second connecting member are provided with a plurality of annular grooves corresponding to the plurality of first coating members one by one. Each first coating member is embedded into the corresponding annular groove.

7. The solder flux coating device for solar cells according to claim 1, characterized in that, The base is provided with a plurality of second grooves, each second groove recessed inward from the fourth surface to communicate with the receiving cavity. The plurality of second coating members correspond to the plurality of second grooves one by one, and a part of each second coating member is fixed in the second groove.

8. The battery cell soldering flux coating device according to any one of claims 1 to 7, characterized in that, The base is provided with a first liquid injection port communicating with the inner cavity, and a first plugging member for closing / opening the first liquid injection port; The base is provided with a second liquid injection port communicating with the receiving cavity, and a second plugging member for closing / opening the second liquid injection port.

9. The solder flux coating device for solar cells according to claim 1, characterized in that, The projection of each first coating member on the third surface corresponds to the projection of each second coating member on the third surface one by one, and they have the same extension length in the direction perpendicular to the preset direction.

10. The solder flux coating device for battery chips according to claim 1, characterized in that, The width of each second coating member in the preset direction gradually decreases towards the direction close to the third surface.

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