Soldering flux coating mechanism, battery piece feeding device and series welding equipment

Abstract

The utility model discloses a soldering flux coating mechanism, a battery piece feeding device and series welding equipment, the soldering flux coating mechanism is used for coating soldering flux to a welding point on the surface of a battery piece before a welding strip is laid on the battery piece, and the welding point is used for being welded to the welding strip; the scaling powder coating mechanism comprises a lifting module and a coating pen assembly. The coating pen assembly is configured to be driven by the lifting module to descend so as to coat soldering flux on a welding point on a battery piece below the coating pen assembly, and is driven by the lifting module to ascend and reset after coating is finished; according to the application, the soldering flux can be coated on the welding points on the battery piece through the lifting of the coating pen assembly before the welding strip is laid on the battery piece, so that the volatilization loss caused by the heating of the soldering flux on the welding strip before the battery piece which is laid and stacked with the welding strip subsequently enters a welding area can be made up; therefore, the influence on the welding quality of the welding strip and the battery piece due to the heat loss of the soldering flux can be avoided, and the welding reliability of the welding strip and the battery piece is ensured.

Description

Technical Field

[0001] This application relates to the technical field of photovoltaic cell manufacturing, in particular to a flux coating mechanism, a wafer loading device, and a string welding equipment. Background Art

[0002] Currently, the process of forming a cell string is as follows: flux is coated on the solder tape, and then the solder tape coated with flux and the wafers are laid and stacked on a welding conveyor belt according to the stringing rules of the cell string. The welding conveyor belt transports the wafers and the solder tape to be heated under a light box to weld the solder tape and the wafers.

[0003] Since the distance between two adjacent wafers is relatively close after the wafers are laid and stacked, when the preceding wafer enters the light box welding area for heating and welding, although the subsequent wafer to be welded has not yet entered the light box welding area, it will also be affected by the heat of the light box, resulting in varying degrees of volatilization of the flux on the surface of the solder tape of the wafer to be welded, reducing the amount of flux, and affecting the final welding quality of the solder tape and the wafer to be welded. Summary of the Utility Model

[0004] To solve the problems of the prior art, this application provides a flux coating mechanism, a wafer loading device, and a string welding equipment.

[0005] Specifically, in a first aspect, this application provides a flux coating mechanism for coating flux onto the welding points on the surface of a wafer before laying a solder tape on the wafer, where the welding points are used for welding with the solder tape;

[0006] The flux coating mechanism includes a lifting module and a coating pen assembly;

[0007] The coating pen assembly is configured to be driven by the lifting module to descend to coat flux onto the welding points on the wafer located below the coating pen assembly, and to be driven by the lifting module to rise and reset after the coating is completed.

[0008] The flux coating mechanism provided by this application can coat flux onto the welding points on the wafer through the lifting of the coating pen assembly before laying the solder tape on the wafer, which can make up for the volatilization loss of the flux on the solder tape due to heat before the wafer with the laid and stacked solder tape enters the welding area, and thus can avoid affecting the welding quality of the solder tape and the wafer due to the heat loss of the flux, and ensure the welding reliability of the solder tape and the wafer.

[0009] In some embodiments, the coating pen assembly includes a coating pen group, and the coating pen group includes at least two coating pens arranged side by side at intervals along a first direction, where the first direction is parallel to the extending direction of the fine grid lines on the wafer, and each coating pen is used to coat flux on at least two corresponding welding points on the wafer simultaneously;

[0010] Alternatively,

[0011] The coating pen assembly includes at least two coating pen groups. Each coating pen group includes at least two coating pens arranged side by side and spaced apart along a first direction. Adjacent two coating pen groups are arranged side by side and spaced apart along a second direction. The first direction is parallel to the extending direction of the fine grid lines on the battery cell, and the second direction is perpendicular to the first direction. Each coating pen is used to simultaneously coat flux on at least four welding points on the battery cell one by one.

[0012] One coating pen group is arranged in the coating pen assembly. The coating pen group includes at least two coating pens arranged side by side and spaced apart along a direction parallel to the extending direction of the fine grid lines on the battery cell. The coating pens simultaneously coat flux on at least two welding points on the battery cell one by one, so that each time, flux can be simultaneously coated on a row of welding points on the battery cell. And since the solder tape is perpendicular to the extending direction of the fine grid lines when laid on the battery cell, the row of welding points coated each time corresponds to multiple solder tapes one by one. Thus, each solder tape can be reliably welded to the battery cell.

[0013] Alternatively, at least two coating pen groups are arranged in the coating pen assembly. Each coating pen group includes at least two coating pens arranged side by side and spaced apart along a direction parallel to the extending direction of the fine grid lines on the battery cell, and adjacent two coating pen groups are arranged side by side and spaced apart along a direction perpendicular to the extending direction of the fine grid lines on the battery cell, so that each time, flux can be simultaneously coated on at least two rows of welding points on the battery cell. And since the solder tape is perpendicular to the extending direction of the fine grid lines when laid on the battery cell, each row of welding points corresponds to multiple solder tapes one by one. Thus, each solder tape can be welded to the battery cell through at least two welding points with flux, ensuring reliable welding between the solder tape and the battery cell.

[0014] In some embodiments, the coating pen includes: a pen tip and a pen core, and the pen tip is installed at the bottom of the pen core;

[0015] The pen core is configured to store flux and convey the flux to the pen tip;

[0016] The pen tip is used to coat flux on the welding point.

[0017] The pen core can store a certain amount of flux, supply the flux to the pen tip connected to the bottom of the pen core, and the pen tip can coat the flux on the welding point.

[0018] In some embodiments, the flux coating mechanism further includes a flux supplement module. The liquid inlet end of the flux supplement module is communicated with the flux supply part, and the liquid outlet end of the flux supplement module is communicated with the coating pen assembly;

[0019] The flux supplement module is configured to supplement the flux output by the flux supply part into the coating pen assembly.

[0020] The liquid inlet end of the flux supplement module is connected to the flux supply unit and can receive the flux provided by the flux supply unit. The liquid outlet end of the flux supplement module is connected to the coating pen assembly and can supplement the flux received from the flux supply unit into the coating pen assembly, realizing the on-line and timely supplement of the flux and ensuring the coating efficiency.

[0021] In some embodiments, the flux supplement module includes:

[0022] A valve and a spray member. The first end of the valve is connected to the flux supply unit, the second end of the valve is connected to the first end of the spray member, and the second end of the spray member faces the coating pen assembly;

[0023] The valve is configured to open when the amount of flux in the coating pen assembly is insufficient, so as to transport the flux pumped out by the flux supply unit to the spray member;

[0024] The spray member is configured to spray and transport the flux to the coating pen assembly.

[0025] By connecting the first end of the valve to the flux supply unit, the second end to the first end of the spray member, and the second end of the spray member facing the coating pen assembly, it is possible to supplement the flux in the coating pen assembly by opening the valve when the flux in the coating pen assembly is insufficient.

[0026] In some embodiments, the coating pen assembly includes at least two coating pens. Each coating pen is correspondingly provided with a spray member, and each spray member is correspondingly connected to a valve; or,

[0027] The coating pen assembly includes at least two coating pens. Each coating pen is correspondingly provided with a spray member, and all the spray members are connected to one valve.

[0028] Each coating pen is correspondingly provided with a spray member, and each spray member is correspondingly connected to a valve, which can separately control the flux supplement of each coating pen. Or, each coating pen is correspondingly provided with a spray member, and all the spray members are connected to one valve, which can simultaneously control the flux supplement of all the coating pens.

[0029] In some embodiments, the flux supplement module includes a valve, a liquid collecting chamber and a permeable member. The coating pen assembly includes at least two coating pens, wherein:

[0030] The first end of the valve is connected to the flux supply unit, and the second end of the valve is connected to the liquid inlet end of the liquid collecting chamber;

[0031] The permeable members are arranged corresponding to the coating pens one by one. The first end of the permeable member is inserted into the liquid collecting chamber from below the liquid collecting chamber, and the second end of the permeable member is connected to the corresponding coating pen. The flux in the liquid collecting chamber penetrates into the corresponding coating pen through the permeable member.

[0032] A liquid collection cavity communicating with the liquid outlet end of the valve is provided between the valve and the coating pen, and a permeable member corresponding to each coating pen and inserted into the liquid collection cavity from below the liquid collection cavity is provided, so that the flux in the coating pen can be replenished by permeation, realizing continuous and uniform replenishment of the flux in all coating pens.

[0033] In some embodiments, the coating pen assembly includes at least two coating pens;

[0034] The lifting module includes a lifting drive assembly and a lifting frame; each coating pen is mounted on the lifting frame, and the lifting frame is configured to be driven by the lifting drive assembly to lift, so as to drive all the coating pens to lift simultaneously;

[0035] Or,

[0036] The lifting module includes a lifting drive assembly drivingly connected to each coating pen in a one-to-one correspondence, and each lifting drive assembly is used to drive the corresponding coating pen to lift.

[0037] Each coating pen is mounted on a lifting frame, and the lifting frame is driven by a lifting drive assembly, and all the coating pens can be lifted simultaneously, with a simple structure and low cost; by configuring a lifting drive assembly drivingly connected to each coating pen in a one-to-one correspondence, independent lifting control of a single coating pen can be realized.

[0038] In a second aspect, the present application further provides a battery cell loading device, which includes: a battery cell conveying mechanism and a flux coating mechanism provided as any one of the first aspect;

[0039] The coating pen assembly of the flux coating mechanism is mounted above the battery cell conveying mechanism;

[0040] The battery cell conveying mechanism is configured to convey battery cells;

[0041] The flux coating mechanism is configured to: when the battery cell conveying mechanism conveys the battery cells to below the flux coating mechanism, coat flux on the welding points on the surface of the battery cells.

[0042] In the battery cell loading device provided by the present application, a flux coating mechanism is provided above the battery cell conveying mechanism for conveying battery cells, and flux can be coated on the welding points on the surface of the battery cells during the conveying process of the battery cells, realizing continuous flux coating on each battery cell, so as to continuously provide battery cells with flux for the subsequent process.

[0043] In some embodiments, the fine grid lines of the battery cells located on the battery cell conveying mechanism extend in a first direction, and the battery cell conveying mechanism is configured to convey the battery cells forward in a second direction perpendicular to the first direction; 5]

[0044] The flux coating mechanism is configured to: when the cell conveying mechanism conveys the cell below the flux coating mechanism, coat flux on at least the welding points that are close to the front side edge of the cell and arranged side by side in the first direction.

[0045] When the cell is conveyed below the flux coating mechanism, the flux coating mechanism coats flux on at least the welding points that are close to the front side edge of the cell and arranged side by side in the first direction, and can implement the coating of flux on at least a row of welding points at the head of the cell, ensuring the welding reliability between the head of the cell and the solder tape.

[0046] In a third aspect, the present application further provides a string welding device, which includes: the cell loading device, the handling device, the solder tape coating device, the pressing and cutting device, the solder tape traction device, the welding conveying device, and the welding device provided in the second aspect;

[0047] The cell loading device is used to convey the cell to the loading station, and to coat flux on the welding points on the surface of the cell during the conveying process of the cell;

[0048] The solder tape traction device is used to clamp and traction at least two solder tapes, so that the solder tapes pass through the solder tape coating device and the pressing and cutting device in sequence. The solder tape coating device is used to coat flux on the solder tapes, and the pressing and cutting device is used to press and cut the solder tapes after the solder tape traction device tractions the solder tapes coated with flux to a preset length;

[0049] The handling device is used to pick up the cell at the loading station, and cooperate with the solder tape traction device to lay and stack the cell and the solder tape on the welding conveying device according to the stringing rule of the battery string, wherein the solder tape is laid and stacked on the cell along the direction perpendicular to the fine grid lines on the cell;

[0050] The welding conveying device is used to convey the cell stacked with the solder tape to the welding device, and the welding device is used to heat the cell stacked with the solder tape to weld the solder tape and the cell together.

[0051] Before the cell loading device conveys the cell to the loading station and the cell is carried to the welding conveying device for laying and stacking the solder tape, it coats flux on the welding points on the surface of the cell to make up for the loss of flux caused by the heating of the solder tape when the cell stacked with the solder tape is conveyed to the welding device by the welding conveying device, thereby ensuring the welding quality between the solder tape and the cell.

[0052] In some embodiments, the string welding device further includes a cell gluing device, which is arranged in front of the cell loading device and is used to apply glue dots on at least one surface of the cell. The glue dots are applied on the solder tape laying path of the cell, and the glue dots do not coincide with the welding points.

[0053] Apply glue dots for low-temperature welding to at least one surface of the cell. After the cell with glue dots is laid and stacked with the solder tape, the glue of the glue dots is cured and the solder on the surface of the solder tape is melted to achieve the glue bonding and welding between the solder tape and the cell.

[0054] This application also discloses a series welding method, which includes:

[0055] Coat flux on the welding points on the surface of the cell;

[0056] Coat flux on the solder tape;

[0057] Lay and stack the flux-coated cells and the flux-coated solder tapes according to the series connection rules of the battery string and heat and weld them to form a battery string.

[0058] The series welding method provided by this application can coat flux on the welding points on the cell before laying the solder tape on the cell, which can make up for the volatilization loss of the flux on the solder tape caused by heat before the cell with the solder tape laid and stacked enters the welding area. Furthermore, it can avoid affecting the welding quality between the solder tape and the cell due to the heat loss of the flux and ensure the welding reliability between the solder tape and the cell.

[0059] In some embodiments, the series welding method further includes, before coating flux on the welding points on the surface of the cell, applying glue dots on at least one surface of the cell. The glue dots are applied on the solder tape laying path of the cell, and the glue dots do not coincide with the welding points.

[0060] Before coating flux on the welding points on the surface of the cell, applying glue dots on the surface of the cell, and the glue dots do not coincide with the welding points, which can achieve the glue bonding and welding between the cell and the solder tape while avoiding the reaction between the flux on the cell and the glue dots. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Referring to the accompanying drawings, the disclosure of this application will become easier to understand. It is easy for those skilled in the art to understand that: these drawings are only for illustrative purposes and are not intended to limit the protection scope of this application. In addition, similar numbers in the figures are used to represent similar components, where:

[0062] Figure 1 is a schematic structural diagram of a cell;

[0063] Figure 2 is Figure 1 the enlarged view at A in

[0064] Figure 3 is a schematic structural diagram of a flux coating mechanism in one embodiment of this application;

[0065] Figure 4It is a side view of the flux coating mechanism in one embodiment of the present application;

[0066] Figure 5 is Figure 4 the A-A cross-sectional view in;

[0067] Figure 6 It is a front view of the flux coating mechanism in one embodiment of the present application;

[0068] Figure 7 is Figure 6 the B-B cross-sectional view in;

[0069] Figure 8 It is a front view of the flux coating mechanism in another embodiment of the present application;

[0070] Figure 9 is Figure 8 the top view of;

[0071] Figure 10 is Figure 9 the C-C cross-sectional view in;

[0072] Figure 11 It is a schematic structural diagram of the battery sheet feeding device in one embodiment of the present application;

[0073] Figure 12 It is a schematic structural diagram of the string welding equipment in one embodiment of the present application.

[0074] Wherein: 1. Battery sheet; 11. Fine grid line; 12. Welding point; 2. Solder tape; 3. Lifting module; 31. Lifting drive component; 32. Lifting frame; 33. Connecting piece; 4. Coating pen assembly; 41. Coating pen; 411. Pen tip; 412. Pen core; 5. Flux supplement module; 51. Valve; 52. Spraying part; 53. Liquid collecting cavity; 54. Penetrating part; 55. Pipeline; 56. Flux flow channel; 6. Tooling; 100. Battery sheet feeding device; 110. Flux coating mechanism; 120. Battery sheet conveying mechanism; 200. Handling device; 300. Solder tape coating device; 400. Pressing and cutting device; 500. Solder tape traction device; 600. Welding conveying device; 700. Welding device; 800. Tooling loading device; 900. Tooling unloading device. Detailed implementation manners

[0075] Next, some embodiments of the present application will be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not intended to limit the protection scope of the present application.

[0076] Currently, the process of stringing battery cells is as follows: after applying flux to the solder tape, the solder tape with flux is laid and stacked with the battery cells according to the stringing rules of the battery string, and then conveyed under the light box for heating and welding. However, when conveying on the conveyor belt after laying and stacking, the distance between adjacent two battery cells is relatively close. When the prior battery cell enters the light box welding area for heating and welding, although the battery cell to be welded immediately behind has not yet entered the light box welding area, it will also be affected by the heat of the light box, resulting in varying degrees of volatilization of the flux on the surface of the solder tape of the battery cell to be welded, reducing the amount of flux, and affecting the final welding quality between the solder tape and the battery cell to be welded. To solve the above problems, the present application creatively proposes a flux coating mechanism, a battery cell loading device, a string welding device and a string welding method, which can coat the welding points on the battery cell with flux by the lifting of the coating pen assembly before laying the solder tape on the battery cell, making up for the volatilization loss of the flux on the solder tape due to heat before the battery cell with the subsequently laid and stacked solder tape enters the welding area, and further avoiding the influence of the heat loss of the flux on the welding quality between the solder tape and the battery cell, ensuring the welding reliability between the solder tape and the battery cell.

[0077] The following will specifically elaborate on the present application through specific embodiments.

[0078] An embodiment of the present application provides a flux coating mechanism 110, which is used to coat flux onto the welding points 12 on the surface of the battery cell 1 before laying the solder tape 2 on the battery cell 1, and the welding points 12 are used to weld with the solder tape 2; the solder tape 2 is a copper tape with a coating, and the coating can be a tin coating, a SnBiAg (tin-bismuth-silver) alloy layer or other metal layers or alloy layers. During the welding process, the coating on the solder tape 2 melts and is welded to the welding points 12 on the surface of the battery cell. Refer to Figure 1 And Figure 2 As shown, there are multiple rows of fine grid lines 11 arranged on the surface of the battery cell 1. When the solder tape 2 is laid and stacked, it is perpendicular to the direction of the fine grid lines 11. At least one row of welding points 12 is arranged on the surface of the battery cell 1 along the direction parallel to the fine grid lines 11 at the head (i.e., the end where the battery cell 1 first enters the welding area). The battery cell 1 may also be provided with several rows of welding points 12 at the tail and / or the middle, where the tail refers to the end of the battery cell 1 far from the head, and the middle refers to the part of the battery cell between the head and the tail.

[0079] Refer to Figures 3 - 6 As shown, the flux coating mechanism 110 includes a lifting module 3 and a coating pen assembly 4;

[0080] The coating pen assembly 4 is configured to be driven by the lifting module 3 to descend to coat flux onto the welding points 12 on the battery cell 1 located below the coating pen assembly 4, and to be driven by the lifting module 3 to rise and reset after the coating is completed.

[0081] The solder paste coating mechanism 110 provided by the present application can coat the solder paste on the welding points 12 on the battery cell 1 by lifting the coating pen assembly 4 before laying the solder tape 2 on the battery cell 1, which can make up for the volatilization loss of the solder paste on the solder tape 2 caused by heating before the battery cell 1 with the solder tape 2 laid and stacked enters the welding area, and thus can avoid affecting the welding quality of the solder tape 2 and the battery cell 1 due to the heat loss of the solder paste, and ensure the welding reliability of the solder tape 2 and the battery cell 1.

[0082] In one embodiment, the coating pen assembly 4 includes a coating pen group, and the coating pen group includes at least two coating pens 41 arranged side by side at intervals along the first direction, the first direction is parallel to the extending direction of the fine grid lines 11 on the battery cell 1, and each coating pen 41 is used to coat the solder paste on at least two welding points 12 on the battery cell 1 in a one-to-one correspondence.

[0083] A coating pen group is arranged in the coating pen assembly 4. The coating pen group includes at least two coating pens 41 arranged side by side at intervals along the direction parallel to the extending direction of the fine grid lines 11 on the battery cell 1. The coating pens 41 simultaneously coat the solder paste on at least two welding points 12 on the battery cell 1 in a one-to-one correspondence, so that each time the solder paste can be coated on a row of welding points 12 on the battery cell 1 at the same time. And since the solder tape 2 and the battery cell 1 are laid perpendicular to the extending direction of the fine grid lines 11, the row of welding points 12 coated each time corresponds to multiple solder tapes 2 one by one, so that each solder tape 2 can be reliably welded to the battery cell 1.

[0084] Optionally, for the solder paste coating mechanism with only one coating pen group, when it is necessary to coat the solder paste on two rows or even multiple rows of welding points 12 on the battery cell, the relative movement of the coating pen group and the battery cell 1 along the direction perpendicular to the extending direction of the fine grid lines 11 can be controlled, so that a coating pen group sequentially coats the solder paste on each row of welding points 12.

[0085] In another embodiment, the coating pen assembly 4 includes at least two coating pen groups, each coating pen group includes at least two coating pens 41 arranged side by side at intervals along the first direction, and the adjacent two coating pen groups are arranged side by side at intervals along the second direction. The first direction is parallel to the extending direction of the fine grid lines 11 on the battery cell 1, and the second direction is perpendicular to the first direction. Each coating pen 41 is used to coat the solder paste on at least four welding points 12 on the battery cell 1 in a one-to-one correspondence.

[0086] At least two coating pen groups are provided in the coating pen assembly 4. Each coating pen group includes at least two coating pens 41 arranged side by side at intervals along a direction parallel to the extension direction of the fine grid lines 11 on the battery cell 1. Two adjacent coating pen groups are arranged side by side at intervals along a direction perpendicular to the extension direction of the fine grid lines 11 on the battery cell 1, so that the flux can be applied to at least two rows of welding points 12 on the battery cell 1 at a time. Since the solder tape 2 is perpendicular to the extension direction of the fine grid lines 11 when laid on the battery cell 1, each row of welding points 12 corresponds to multiple solder tapes 2 one by one. Therefore, each solder tape 2 can be welded to the battery cell 1 through at least two welding points 12 with flux, ensuring reliable welding between the solder tape 2 and the battery cell 1.

[0087] Optionally, the number of coating pens 41 in a coating pen group is the same as the number of a row of welding points 12 arranged along the first direction on the battery cell 1. Thus, each time the coating pen assembly 4 descends, a coating pen group can apply flux to a row of welding points 12 on the battery cell 1, improving the coating efficiency. The number of coating pen groups can be correspondingly set according to the number of rows of welding points 12 to be coated with flux on the battery cell 1, so as to achieve one-time flux coating on all welding points 12, with higher efficiency. Of course, it can also be less than the number of rows of welding points 12 to be coated with flux on the battery cell 1 for fractional flux coating.

[0088] In some embodiments, referring to Figure 7 and Figure 10 as shown, the coating pen 41 includes: a pen tip 411 and a pen core 412, and the pen tip 411 is installed at the bottom of the pen core 412;

[0089] The pen core 412 is configured to store flux and convey the flux to the pen tip 411;

[0090] The pen tip 411 is used to apply flux to the welding points 12.

[0091] The pen core 412 can store a certain amount of flux and supply the flux to the pen tip 411 connected to the bottom of the pen core 412, and the pen tip 411 can apply the flux to the welding points 12.

[0092] In some embodiments, referring to Figure 3 as shown, the flux coating mechanism 110 further includes a flux supplement module 5. The liquid inlet end of the flux supplement module 5 is communicated with a flux supply part (not shown in the figure), and the liquid outlet end of the flux supplement module 5 is communicated with the coating pen assembly 4;

[0093] The flux assisting module 5 is configured to supplement the flux output by the flux feeding unit into the coating pen assembly 4. Optionally, the liquid outlet end of the flux assisting module 5 is directly assembled and communicated with the liquid inlet end of the coating pen assembly 4, or the liquid outlet end of the flux assisting module 5 is communicated with the liquid inlet end of the coating pen assembly 4 through a connecting piece.

[0094] The liquid inlet end of the flux assisting module 5 is communicated with the flux feeding unit and can receive the flux provided by the flux feeding unit. The liquid outlet end of the flux assisting module 5 is communicated with the coating pen assembly 4 and can supplement the flux received from the flux feeding unit into the coating pen assembly 4, realizing the on-line and timely supplement of the flux and ensuring the coating efficiency.

[0095] Optionally, the liquid inlet end of the flux assisting module 5 can be directly communicated with the flux feeding unit through a pipeline, or can be communicated with the flux flow channel 56 opened inside the lifting frame 32 through a pipeline 55, and the flux flow channel 56 is communicated with the flux feeding unit (as Figure 7 shown).

[0096] In some embodiments, as shown in Figures 3 - 7 , the flux assisting module 5 includes:

[0097] A valve 51 and a spraying member 52. The first end of the valve 51 is communicated with the flux feeding unit, the second end of the valve 51 is communicated with the first end of the spraying member 52, and the second end of the spraying member 52 faces the coating pen assembly 4;

[0098] The valve 51 is configured to: open when the amount of flux in the coating pen assembly 4 is insufficient to convey the flux pumped out by the flux feeding unit to the spraying member 52;

[0099] The spraying member 52 is configured to: spray and convey the flux to the coating pen assembly 4.

[0100] By communicating the first end of the valve 51 with the flux feeding unit, the second end with the first end of the spraying member 52, and the second end of the spraying member 52 facing the coating pen assembly 4, it is possible to supplement the flux in the coating pen assembly 4 by opening the valve 51 when the flux in the coating pen assembly 4 is insufficient.

[0101] In one embodiment, as shown in Figure 3 , Figure 5 and Figure 6 , the coating pen assembly 4 includes at least two coating pens 41, each coating pen 41 is correspondingly configured with a spraying member 52, and each spraying member 52 is correspondingly communicated with a valve 51.

[0102] Each coating pen 41 is correspondingly configured with a spraying member 52, and each spraying member 52 is correspondingly communicated with a valve 51, which can separately control the flux supplement of each coating pen 41.

[0103] In another embodiment, the coating pen assembly 4 includes at least two coating pens 41, and each coating pen 41 is correspondingly configured with an ejector 52, and all the ejectors 52 communicate with a valve 51.

[0104] Each coating pen 41 is correspondingly configured with an ejector 52, and all the ejectors 52 communicate with a valve 51. After the valve 51 is opened, the flux pumped out by the flux feeding part enters a valve 51, and simultaneously enters all the ejectors 52 communicating with the valve 51 from the valve 51, so as to enter all the coating pens 41, and the flux replenishment of all the coating pens 41 can be simultaneously controlled. Optionally, the liquid inlet ends of the ejectors 52 communicate with the liquid outlet end of the valve 51 through a manifold block.

[0105] In some embodiments, referring to Figures 8 - 10 as shown, the flux supplement module 5 includes a valve 51, a liquid collecting cavity 53 and a permeating member 54, and the coating pen assembly 4 includes at least two coating pens 41, wherein:

[0106] The first end of the valve 51 communicates with the flux feeding part, and the second end of the valve 51 communicates with the liquid inlet end of the liquid collecting cavity 53;

[0107] The permeating members 54 are arranged in one-to-one correspondence with the coating pens 41. The first end of the permeating member 54 is inserted into the liquid collecting cavity 53 from below the liquid collecting cavity 53, and the second end of the permeating member 54 communicates with the corresponding coating pen 41, and the flux in the liquid collecting cavity 53 penetrates into the corresponding coating pen 41 through the permeating member 54. Optionally, a pipeline is communicated between the upper liquid inlet end of the liquid collecting cavity 53 and the discharging end of the flux feeding part, and a valve 51 is installed on the pipeline. The first end of the valve 51 communicates with the flux feeding part, and the second end of the valve 51 communicates with the liquid inlet end of the liquid collecting cavity 53.

[0108] By providing a liquid collecting cavity 53 communicating with the liquid outlet end of the valve 51 and permeating members 54 arranged in one-to-one correspondence with the coating pens 41 and inserted into the liquid collecting cavity 53 from below the liquid collecting cavity 53 between the valve 51 and the coating pens 41, the flux in the coating pens 41 can be replenished by a permeating method, and continuous and uniform replenishment of the flux in all the coating pens 41 can be realized.

[0109] In some embodiments, the coating pen assembly 4 includes at least two coating pens 41;

[0110] The lifting module 3 includes a lifting drive assembly 31 and a lifting frame 32; each coating pen 41 is installed on the lifting frame 32, and the lifting frame 32 is configured to be driven by the lifting drive assembly 31 to lift or lower, so as to drive all the coating pens 41 to lift or lower simultaneously. Optionally, the flux coating mechanism further includes at least two connecting members 33. The at least two connecting members 33 are evenly distributed on both sides of the lifting frame 32. The first end of the connecting member 33 is fixedly connected to the side surface of the lifting frame 42, and the second end of the connecting member 33 is fixedly connected to the driving end of the lifting drive assembly 31. The lifting drive assembly 31 drives the connecting member 33 to lift or lower to drive the lifting frame 32 to lift or lower. The lifting frame 42 is connected to the lifting drive assembly 31 through the connecting member 33 fixedly connected to the side surface, so as to avoid affecting the arrangement of the coating pens 41 on the bottom surface of the lifting frame 42.

[0111] Each coating pen 41 is installed on a lifting frame 32. The lifting frame 32 is driven by a lifting drive assembly 31 and can implement the simultaneous lifting or lowering of all the coating pens 41, with a simple structure and low cost.

[0112] In another embodiment, the lifting module 3 includes a lifting drive assembly (not shown in the figure) that is drivingly connected to the coating pen 41 in one-to-one correspondence, and each lifting drive assembly is used to drive the corresponding coating pen 41 to lift or lower.

[0113] The lifting drive assembly drivingly connected to the coating pen 41 in one-to-one correspondence can implement the lifting or lowering of a single coating pen 41.

[0114] By configuring a lifting drive assembly drivingly connected to the coating pen 41 in one-to-one correspondence, the independent lifting control of a single coating pen can be implemented.

[0115] The flux coating mechanism 110 provided by the embodiment of the present application is applicable to battery wafers without main grids and also to battery wafers with main grids. The welding points 12 on the surface of the battery wafer with a main grid are arranged on the main grid on the surface of the battery wafer, and the main grid is perpendicular to the fine grid lines.

[0116] The embodiment of the present application also provides a battery wafer loading device 100. Referring to Figure 11 As shown, the battery wafer loading device 100 includes: a battery wafer conveying mechanism 120 and the flux coating mechanism 110 provided in any of the above embodiments;

[0117] The coating pen assembly 4 of the flux coating mechanism 110 is installed above the battery wafer conveying mechanism 120;

[0118] The battery wafer conveying mechanism 120 is configured to convey the battery wafer 1;

[0119] The flux coating mechanism 110 is configured to: when the battery wafer conveying mechanism 120 conveys the battery wafer 1 to below the flux coating mechanism 110, coat flux on the welding points 12 on the surface of the battery wafer 1.

[0120] For the battery sheet loading device 100 provided in this application, a flux coating mechanism 110 is arranged above the battery sheet conveying mechanism 120 for conveying the battery sheets 1, so that during the conveying process of the battery sheets 1, flux can be coated on the welding points 12 on the surfaces of the battery sheets 1, realizing continuous flux coating for each battery sheet 1, thereby continuously providing battery sheets 1 with flux for the subsequent process.

[0121] As described above, when the previous battery sheet enters the light box welding area for heating and welding, although the subsequent battery sheet to be welded has not yet entered the light box welding area, it will also be affected by the heat of the light box, resulting in varying degrees of volatilization of the flux on the surface of the solder tape on the battery sheet to be welded, and the amount of flux decreases, affecting the final welding quality between the solder tape and the battery sheet to be welded. Among them, since the head of the battery sheet is closest to the light box welding area, the flux volatilization amount on the solder tape at the head of the battery sheet is the largest, affecting the welding reliability between the solder tape and the head of the battery sheet.

[0122] To solve the above technical problems, in some embodiments, the fine grid lines 11 of the battery sheet 1 located on the battery sheet conveying mechanism 120 extend in a first direction, and the battery sheet conveying mechanism 120 is configured to convey the battery sheet 1 forward in a second direction perpendicular to the first direction;

[0123] The flux coating mechanism 110 is configured to: when the battery sheet conveying mechanism 120 conveys the battery sheet 1 below the flux coating mechanism 110, at least coat flux on each welding point 12 arranged side by side along the first direction and close to the front side edge of the battery sheet 1, that is, at least coat flux on a row of welding points 12 at the head of the battery sheet 1. Since the solder tape 2 is laid on the battery sheet 1 perpendicular to the direction of the fine grid lines 11 on the battery sheet 1, each solder tape 2 can be reliably welded to the head of the battery sheet 1.

[0124] When the battery sheet 1 is conveyed below the flux coating mechanism 110, the flux coating mechanism 110 coats flux on each welding point 12 arranged side by side along the first direction and close to the front side edge of the battery sheet 1, which can realize the coating of flux on at least a row of welding points 12 at the head of the battery sheet 1, ensuring reliable welding between the solder tape 2 and the head of the battery sheet 1. Of course, according to the actual welding situation between the solder tape 2 and the battery sheet 1, flux can be selectively coated on the remaining rows of welding points on the battery sheet 1.

[0125] This application embodiment also provides a string welding device, referring to Figure 12 As shown, the string welding device includes: the battery sheet loading device 100, a handling device 200, a solder tape coating device 300, a pressing and cutting device 400, a solder tape traction device 500, a welding conveying device 600, and a welding device 700 provided in the above embodiments;

[0126] The solar cell loading device 100 is used to convey the solar cell 1 to the loading station, and to apply flux to the welding points 12 on the surface of the solar cell 1 during the conveyance of the solar cell 1.

[0127] The solder strip traction device 500 is used to clamp and traction at least two solder strips 2, so that the solder strips 2 pass through the solder strip coating device 300 and the pressing and cutting device 400 in sequence. The solder strip coating device 300 is used to apply flux to the solder strips 2, and the pressing and cutting device 400 is used to press and cut the solder strips 2 after the solder strip traction device 500 tractions the flux-coated solder strips 2 to a preset length.

[0128] The handling device 200 is used to pick up the solar cell 1 at the loading station, and cooperate with the solder strip traction device 500 to lay and stack the solar cell 1 and the solder strips 2 on the welding conveying device 600 according to the stringing rules of the solar cell string, wherein the solder strips 2 are laid and stacked on the solar cell 1 along the direction perpendicular to the fine grid lines 11 on the solar cell 1.

[0129] The welding conveying device 600 is used to convey the solar cell 1 stacked with the solder strips 2 to the welding device 700, and the welding device 700 is used to heat the solar cell 1 stacked with the solder strips 2 to weld the solder strips 2 and the solar cell 1 together.

[0130] Before the solar cell loading device 100 conveys the solar cell 1 to the loading station and the solar cell 1 is carried to the welding conveying device 600 for laying and stacking of the solder strips 2, flux is applied to the welding points 12 on the surface of the solar cell 1 to make up for the loss of flux caused by the heating of the solder strips 2 when the solar cell 1 stacked with the solder strips 2 is conveyed to the welding device 700 by the welding conveying device 600, thereby ensuring the welding quality between the solder strips 2 and the solar cell 1.

[0131] In some embodiments, the string welding equipment further includes a solar cell gluing device (not shown in the figure), which is arranged in front of the solar cell loading device 100 and is used to apply glue dots to at least one surface of the solar cell 1. The glue dots are applied on the solder strip laying path of the solar cell 1, and the glue dots do not coincide with the welding points 12.

[0132] By applying glue dots to the solder strip laying path of the solar cell 1, after the solar cell 1 and the solder strips 2 are laid and stacked, the solder strips can be further bonded to the solar cell 1 by curing the glue dots, realizing the welding and bonding between the solar cell 1 and the solder strips 2, so as to improve the connection force between the solar cell 1 and the solder strips 2.

[0133] By making the glue dots not coincide with the welding points 12, the reaction between the glue dots and the flux at the welding points 12 can be avoided, thereby avoiding affecting the quality of the glue dots and ensuring that the flux at the welding points 12 can fully play the fluxing effect.

[0134] Optionally, the glue dots are UV glue or thermosetting glue. When the glue dots are UV glue, a UV lamp can be arranged on the welding conveying device to irradiate the glue dots to cure the glue dots; when the glue dots are thermosetting glue, the glue dots can be directly cured by heating the glue dots through the welding device.

[0135] Optionally, the battery cell glue application device can apply glue to one surface or two surfaces of the battery cell 1. Taking the application of glue to two surfaces of the battery cell 1 as an example, the battery cell glue application device includes a first glue application mechanism, a flipping mechanism, and a second glue application mechanism arranged in sequence. The first glue application mechanism applies glue to the first surface of the battery cell by means of screen printing, dispensing, or spraying. The flipping mechanism is used to flip the battery cell 1 by 180° so that the second surface of the battery cell 1 faces upward. The second glue application mechanism applies glue to the second surface of the battery cell 1 by means of screen printing, dispensing, or spraying. The battery cell 1 after glue application is transported to the input end of the battery cell loading device 100.

[0136] Optionally, the string welding equipment further includes a tooling loading device 800;

[0137] The tooling loading device 800 is used to transport the tooling 6, and the handling device 200 is also used to transport the tooling 6 from the tooling loading device 800 to the battery cell 1 stacked with the welding tape 2, so that the tooling 6 presses and positions the welding tape 2 on the battery cell 1.

[0138] Optionally, the string welding equipment further includes a tooling unloading device 900. The tooling unloading device 900 is configured to move between the discharge end of the welding device 700 and the feed end of the tooling loading device 800; the tooling unloading device 900 is used to pick up the tooling 6 on the welded battery cell 1 and transport it to the tooling loading device 800, thereby realizing the recycling of the tooling.

[0139] Optionally, the tooling 6 includes a frame and multiple rows of elastic pressing needles installed on the frame. Each row of pressing needles is used to press and position the welding tape 2 stacked on one battery cell 1.

[0140] The embodiment of the present application also discloses a string welding method, and the string welding method includes:

[0141] S1. Coating a soldering flux on the welding points on the surface of the battery cell.

[0142] S2. Coating a soldering flux on the welding tape.

[0143] S3. Laying, stacking, and heating and welding the battery cell coated with the soldering flux and the welding tape coated with the soldering flux according to the stringing rules of the battery string to make the battery string.

[0144] The string soldering method provided by this application can apply flux to the welding points on the solar cell before laying the solder tape on the solar cell, which can make up for the volatilization loss of the flux on the solder tape caused by heating before the solar cell with the laid and stacked solder tape enters the welding area. Furthermore, it can avoid affecting the welding quality between the solder tape and the solar cell due to the heat loss of the flux, and ensure the welding reliability between the solder tape and the solar cell.

[0145] In some embodiments, the string soldering method further includes:

[0146] SA. Before applying flux to the welding points on the surface of the solar cell, apply glue dots to at least one surface of the solar cell. The glue dots are applied on the solder tape laying path of the solar cell, and the glue dots do not coincide with the welding points.

[0147] Before applying flux to the welding points on the surface of the solar cell, applying glue dots on the surface of the solar cell where the glue dots do not coincide with the welding points can achieve the glue bonding and welding between the solar cell and the solder tape while avoiding the reaction between the flux on the solar cell and the glue dots.

[0148] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0149] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0150] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A flux coating mechanism, characterized in that Before laying the soldering tape on the battery cell, the soldering flux is applied to the welding points on the surface of the battery cell, and the welding points are used for welding with the soldering tape; The soldering flux coating mechanism includes a lifting module and a coating pen assembly; The coating pen assembly is configured to be driven down by the lifting module to apply the soldering flux to the welding points on the battery cell located below the coating pen assembly, and to be driven up by the lifting module to reset after the coating is completed.

2. The soldering flux coating mechanism according to claim 1, characterized in that The coating pen assembly includes a set of coating pens, and the set of coating pens includes at least two coating pens arranged side by side at intervals in a first direction, the first direction is parallel to the extending direction of the fine grid lines on the battery cell, and each coating pen is used to apply the soldering flux to at least two of the welding points on the battery cell in one-to-one correspondence; Or, The coating pen assembly includes at least two sets of coating pens, each set of coating pens includes at least two coating pens arranged side by side at intervals in a first direction, and adjacent two sets of coating pens are arranged side by side at intervals in a second direction, the first direction is parallel to the extending direction of the fine grid lines on the battery cell, the second direction is perpendicular to the first direction, and each coating pen is used to apply the soldering flux to at least four of the welding points on the battery cell in one-to-one correspondence.

3. The solder flux coating mechanism according to claim 2, wherein, The coating pen includes: a pen tip and a pen core, and the pen tip is installed at the bottom of the pen core; The pen core is configured to store the soldering flux and convey the soldering flux to the pen tip; The pen tip is used to apply the soldering flux to the welding points.

4. The solder flux coating mechanism according to claim 1, wherein The soldering flux coating mechanism further includes a soldering flux supplement module, the liquid inlet end of the soldering flux supplement module is communicated with the soldering flux supply part, and the liquid outlet end of the soldering flux supplement module is communicated with the coating pen assembly; The soldering flux supplement module is configured to supplement the soldering flux output by the soldering flux supply part into the coating pen assembly.

5. The solder flux coating mechanism according to claim 4, wherein The soldering flux supplement module includes: A valve and a spraying member, the first end of the valve is communicated with the soldering flux supply part, the second end of the valve is communicated with the first end of the spraying member, and the second end of the spraying member faces the coating pen assembly; The valve is configured to open when the amount of soldering flux in the coating pen assembly is insufficient to convey the soldering flux pumped out by the soldering flux supply part to the spraying member; The spraying member is configured to spray and convey the soldering flux to the coating pen assembly.

6. The flux coating mechanism according to claim 5, characterized in that, The coating pen assembly includes at least two coating pens, each coating pen is correspondingly provided with one spraying member, and each spraying member is correspondingly communicated with one valve; Or, The coating pen assembly includes at least two coating pens, each coating pen is correspondingly provided with one spraying member, and all the spraying members are communicated with one valve.

7. The solder flux coating mechanism according to claim 4, wherein, The soldering flux supplement module includes a valve, a liquid collecting chamber and a permeating member, and the coating pen assembly includes at least two coating pens, wherein: The first end of the valve is communicated with the soldering flux supply part, and the second end of the valve is communicated with the liquid inlet end of the liquid collecting chamber; The penetration members are provided in one-to-one correspondence with the coating pens. The first end of the penetration member is inserted into the liquid collecting cavity from below the liquid collecting cavity, the second end of the penetration member communicates with the corresponding coating pen, and the flux in the liquid collecting cavity penetrates into the corresponding coating pen through the penetration member.

8. The solder flux coating mechanism according to claim 1, wherein The coating pen assembly includes at least two coating pens; The lifting module includes a lifting drive assembly and a lifting frame; each coating pen is mounted on the lifting frame, and the lifting frame is configured to be driven by the lifting drive assembly to lift and lower, so as to drive all the coating pens to lift and lower simultaneously; Or, The lifting module includes lifting drive assemblies drivingly connected to the coating pens in one-to-one correspondence, and each lifting drive assembly is used to drive the corresponding coating pen to lift and lower.

9. A wafer loading device, characterized in that, The solar cell loading device includes: a solar cell conveying mechanism and the flux coating mechanism according to any one of claims 1-8; The coating pen assembly of the flux coating mechanism is mounted above the solar cell conveying mechanism; The solar cell conveying mechanism is configured to convey solar cells; The flux coating mechanism is configured to: when the solar cell conveying mechanism conveys the solar cell below the flux coating mechanism, apply flux to the welding points on the surface of the solar cell.

10. The battery chip feeding device according to claim 9, wherein, The fine grid lines of the solar cell located on the solar cell conveying mechanism extend in a first direction, and the solar cell conveying mechanism is configured to convey the solar cell forward in a second direction perpendicular to the first direction; The flux coating mechanism is configured to: when the solar cell conveying mechanism conveys the solar cell below the flux coating mechanism, apply flux to at least the welding points arranged side by side along the first direction and close to the front side edge of the solar cell.

11. A string welding device, characterized in that, The string welding device includes: the solar cell loading device according to claim 9 or 10, a handling device, a solder tape coating device, a pressing and cutting device, a solder tape traction device, a welding conveying device, and a welding device; The solar cell loading device is used to convey the solar cell to the loading station, and is used to apply flux to the welding points on the surface of the solar cell during the conveying process of the solar cell; The solder tape traction device is used to clamp and traction at least two solder tapes, so that the solder tapes sequentially pass through the solder tape coating device and the pressing and cutting device. The solder tape coating device is used to apply flux to the solder tapes, and the pressing and cutting device is used to press and cut the solder tapes after the solder tape traction device tractions the solder tapes coated with flux to a preset length; The handling device is used to pick up the solar cell at the loading station, and cooperate with the solder tape traction device to lay and stack the solar cell and the solder tape on the welding conveying device according to the stringing rule of the solar cell string, wherein the solder tape is laid and stacked on the solar cell along a direction perpendicular to the fine grid lines on the solar cell; The welding conveying device is used to convey the solar cell stacked with the solder tape to the welding device, and the welding device is used to heat the solar cell stacked with the solder tape to weld the solder tape and the solar cell together.

12. The string welding device according to claim 11, characterized in that, The string welding equipment further includes a battery sheet gluing device, which is arranged in front of the battery sheet loading device and is used to apply glue dots to at least one surface of the battery sheet. The glue dots are applied on the solder tape laying path of the battery sheet, and the glue dots do not coincide with the welding points.

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