A kind of welding strip film pasting device, film pasting method and battery string production equipment

Abstract

The application provides a welding strip film pasting device, a film pasting method and a battery string production equipment, wherein the welding strip film pasting device comprises a welding strip feeding device, a welding strip traction device, a front film pasting device, a back film pasting device, a front film adsorption device and a back film adsorption device, wherein: the welding strip traction device draws out a plurality of parallel welding strips from the welding strip feeding device; the front film adsorption device adsorbs a front film to be pasted; the front film pasting device pastes the front film adsorbed by the front film adsorption device to the front of the welding strip drawn out by the welding strip traction device; the back film adsorption device adsorbs a back film to be pasted; and the back film pasting device pastes the back film adsorbed by the back film adsorption device to the back of the welding strip drawn out by the welding strip traction device. The welding strip film pasting device of the application automatically pastes the front film and the back film to the front and back of the welding strip at intervals, thereby achieving automatic production of the welding strip pasted with the front film and the back film.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, specifically to a welding strip film application device, film application method, and battery string production equipment. Background Technology

[0002] Traditional solar cells use grid lines to conduct the photocurrent generated inside the cell to the outside. Considering the final conductivity, the grid lines are mostly printed with silver paste. According to different printing processes, solar cells are divided into three-busbar, four-busbar, and multi-busbar types.

[0003] For the aforementioned three-busbar, four-busbar, and multi-busbar solar cells, the current method mainly involves soldering multiple solder ribbons to each busbar line of the solar cell using flux, resulting in a cell string composed of several cells connected in series, ultimately achieving the conversion of light energy into electrical energy. However, this method of obtaining cell strings by soldering ribbons to the busbar lines not only results in a large shading area, affecting photoelectric conversion efficiency, but also in high silver paste costs. To overcome these problems, crystalline silicon solar cells have emerged.

[0004] The existing method for stringing solar cells involves applying adhesive to the solar cells during the stacking of solar cells and solder ribbons. Then, the stacked solar cells and solder ribbons are heated and pressed, causing the solder ribbons to adhere to the corresponding solar cells using melted adhesive, thus forming a solar cell string.

[0005] In existing methods of stringing solar cells, adhesive bonding cannot achieve a firm bond between the cells and the solder ribbon during the stacking process, thus reducing the quality of the solar cell string. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention first provides a welding strip film application device, which adopts the following technical solution:

[0007] A welding ribbon film application device includes a welding ribbon feeding device, a welding ribbon traction device, a front film application device, a back film application device, a front film adsorption device, and a back film adsorption device, wherein:

[0008] The welding strip traction device is configured to pull out multiple parallel welding strips from the welding strip feeding device;

[0009] The front film application device and the back film application device are located between the welding strip feeding device and the welding strip traction device;

[0010] The front film adsorption device and the front film application device are arranged opposite to each other. The front film adsorption device is configured to adsorb the front film to be applied, and the front film application device is configured to apply the front film adsorbed by the front film adsorption device to the front of the welding strip pulled out by the welding strip traction device.

[0011] The back film adsorption device and the back film application device are arranged opposite to each other. The back film adsorption device is configured to adsorb the back film to be applied, and the back film application device is configured to apply the back film adsorbed by the back film adsorption device to the back of the welding strip pulled out by the welding strip traction device. The front film and back film applied on the welding strip are distributed alternately.

[0012] The welding ribbon laminating device provided by this invention automatically applies front and back films alternately to the welding ribbon, thereby achieving automated production of welding ribbons covered with front and back films. Using this welding ribbon laminating device to connect battery cells in series enables a stable connection between the welding ribbon and the battery cells, thus improving the quality of the battery string.

[0013] In some embodiments, the solder ribbon laminating apparatus further includes a front film cutting device and a back film cutting device, wherein: the front film cutting device is located at a post-processing station of the front film adsorption device, and is configured to cut the front film at a position between the front film adsorbed by the front film adsorption device and the front film attached to the solder ribbon. The back film cutting device is located at a post-processing station of the back film adsorption device, and is configured to cut the back film at a position between the back film adsorbed by the back film adsorption device and the back film attached to the solder ribbon.

[0014] By setting up a front film cutting device, the front film currently attached to the front side of the solder ribbon is cut. By setting up a back film cutting device, the back film currently attached to the back side of the solder ribbon is cut.

[0015] In some embodiments, the back film applicator and the front film applicator are arranged sequentially along the welding strip traction direction. The back film adsorption device is located below the back film applicator, and the front film adsorption device is located above the front film applicator.

[0016] By arranging the positions of the back film applicator, the front film applicator, the back film adsorption device, and the front film adsorption device, the ribbon applicator of the present invention can automatically apply the front film and the back film to the ribbon being pulled in the horizontal direction.

[0017] In some embodiments, the back film adsorption device includes a first driving mechanism and a back film adsorption plate, wherein the back film adsorption plate is connected to the driving end of the first driving mechanism, the back film adsorption plate is used to adsorb the back film, and the first driving mechanism is used to drive the back film adsorption plate to move toward or away from the solder ribbon; the front film adsorption device includes a second driving mechanism and a front film adsorption plate, wherein the front film adsorption plate is connected to the driving end of the second driving mechanism, the front film adsorption plate is used to adsorb the front film, and the second driving mechanism is used to drive the front film adsorption plate to move toward or away from the solder ribbon.

[0018] Through the cooperation of the first driving mechanism and the back film adsorption plate, the back film adsorption device automatically attaches the back film to the solder ribbon from below. Conversely, through the cooperation of the second driving mechanism and the front film adsorption plate, the front film adsorption device automatically attaches the front film to the solder ribbon from above.

[0019] In some embodiments, the back film applicator includes a back film heating plate, and a plurality of first welding strip guide grooves extending along the traction direction of the welding strip are provided on the side surface of the back film heating plate facing the welding strip; the front film applicator includes a front film heating plate, and a plurality of second welding strip guide grooves extending along the traction direction of the welding strip are provided on the side surface of the front film heating plate facing the welding strip.

[0020] By setting a back film heating plate, the back film attached to the back of the solder ribbon is heated, thereby curing the back film onto the solder ribbon. A first solder ribbon guide groove on the back film heating plate guides the solder ribbon. Similarly, by setting a front film heating plate, the front film attached to the front of the solder ribbon is heated, thereby curing the front film onto the solder ribbon. A second solder ribbon guide groove on the front film heating plate guides the solder ribbon.

[0021] In some embodiments, the welding strip feeding device includes multiple welding strip rolls wound with welding strips, each welding strip roll discharging one welding strip; the welding strip film application device further includes a front film feeding device and a back film feeding device, wherein: the front film feeding device is configured to supply multiple front films to the front film adsorption device along the traction direction of the welding strips, each front film corresponding to at least one welding strip; the back film feeding device is configured to supply multiple back films to the front film adsorption device along the traction direction of the welding strips, each back film corresponding to at least one welding strip.

[0022] By setting up multiple solder strip rolls, simultaneous release of multiple solder strips was achieved. Furthermore, by setting up front and back film feeding devices, feeding of both the front and back films was realized. In particular, using film strips as both the front and back films reduced the amount of front and back films used, thus lowering the production cost of the battery strings.

[0023] The present invention also provides a battery string production equipment, which includes the solder strip laminating device, solder strip cutting device, battery cell supply device, conveying device, and pressing device described in any one of the above claims, wherein:

[0024] The welding strip cutting device is used to cut welding strips with front and back films attached into welding strip assemblies. The welding strip traction device is also used to place the welding strip assemblies on a conveying device. Each welding strip assembly includes a welding strip, a front film attached to the front portion of the welding strip, and a back film attached to the rear portion of the welding strip.

[0025] A cell supply device is used to place cells onto a conveying device; wherein the i-th cell is stacked on the front of the rear portion of the i-th ribbon assembly, and the front portion of the (i+1)-th ribbon assembly is stacked on the i-th cell, where i is any natural number greater than 0.

[0026] The crimping device is used to crimp stacked battery cells and ribbon assemblies together to form battery strings.

[0027] By combining the welding strip film application device, welding strip cutting device, battery cell supply device, conveying device, and pressing device, the battery string production equipment of the present invention realizes the automatic stringing of battery strings, thereby improving the production efficiency and quality of battery strings.

[0028] In some embodiments, the conveying device includes a mounting base, a conveyor belt drive mechanism, a conveyor belt, and a heating plate, wherein: the conveyor belt drive mechanism is disposed on the mounting base; the conveyor belt is mounted on the conveyor belt drive mechanism, the conveyor belt is used to carry and convey the welding strip assembly and the battery cells, and the conveyor belt drive mechanism is used to drive the conveyor belt to convey; the heating plate is disposed on the mounting base and located below the conveyor belt.

[0029] A simple and stable conveying device is provided to support and transport the solder ribbon assembly and the battery cells. By installing a heating plate under the conveyor belt, the stacked solder ribbon assembly and battery cells are heated, thereby melting the front and back films on the solder ribbon assembly to release the adhesion force.

[0030] In some embodiments, the crimping device includes a lifting mechanism and a pressure plate, wherein: the pressure plate is connected to the drive end of the lifting mechanism, and when the lifting mechanism drives the pressure plate to descend, it crimps the stacked battery cells and welding ribbon assemblies together.

[0031] The lifting mechanism drives the pressure plate to press the stacked battery cells and welding ribbon assemblies, so that the welding ribbon assemblies are connected to the corresponding battery cells through the front film and back film on them to obtain battery strings.

[0032] In some embodiments, the battery string production equipment further includes a clamping fixture and a clamping fixture handling device for handling the clamping fixture. The clamping fixture handling device is configured such that for each welding strip assembly placed on the conveying device, a clamping fixture is placed on the front film of the placed welding strip assembly.

[0033] During the stacking of the ribbon assembly and the solar cells, the clamping fixture is pressed onto the front film of the ribbon assembly by the clamping fixture handling device, which realizes the clamping and positioning of the ribbon and improves the crimping quality between the ribbon assembly and the solar cells.

[0034] The present invention also provides a method for applying a film to solder ribbon, comprising:

[0035] Multiple parallel welding strips are pulled out;

[0036] At the front film adsorption station, the i-th segment of the front film to be attached is adsorbed, and at the front film attachment station, the adsorbed i-th segment of the front film is attached to the front of the pulled-out solder ribbon.

[0037] At the back film adsorption station, the i-th segment of back film to be attached is adsorbed. At the back film attachment station, the adsorbed i-th segment of back film is attached to the back of the pulled-out solder ribbon. The front and back films attached to the solder ribbon are distributed alternately, and i is a natural number greater than 0.

[0038] The welding ribbon lamination method provided by this invention automatically applies front and back films alternately to the welding ribbon, thereby completing the automated production of welding ribbons covered with front and back films. Using this welding ribbon lamination device for connecting battery cells eliminates the need for adhesive dispensing, thus improving battery string production efficiency and quality.

[0039] In some embodiments, after attaching the adsorbed i-th segment of back film to the back of the pulled-out solder ribbon at the back film attaching station, the solder ribbon attaching method further includes:

[0040] The welding strip with the i-th front film and the i-th back film attached is pulled forward for a first predetermined distance, so that the i-th front film and the i-th back film attached to the welding strip move forward with the welding strip for a first predetermined distance;

[0041] At the front film adsorption station, the i+1 segment of the front film to be attached is adsorbed, and the front film is cut at the position between the adsorbed i+1 segment of the front film and the i segment of the front film attached to the solder ribbon.

[0042] At the back film adsorption station, the (i+1)th back film segment to be attached is adsorbed, and the back film is cut at the position between the adsorbed (i+1)th back film segment and the i-th back film segment attached to the solder ribbon.

[0043] By traction welding strips to move the front and back films, automatic feeding of the front and back films is achieved, and the cutting of the front and back films currently attached to the welding strips is also completed.

[0044] In some embodiments, after cutting the back film at a position between the adsorbed (i+1)th segment of the back film and the i-th segment of the back film attached to the solder ribbon, the solder ribbon bonding method further includes:

[0045] The welding strip will be pulled forward a second predetermined distance;

[0046] At the front film attaching station, the adsorbed i+1 segment of the front film is attached to the front of the solder ribbon.

[0047] At the back film attaching station, the i+1th segment of back film that has been adsorbed is attached to the back of the solder ribbon.

[0048] By continuing to pull the solder ribbon forward, the solder ribbon that has not yet been coated in the subsequent process enters the front film adsorption station and the back film adsorption station, so that the i+1th segment of the front film and the i+1th segment of the back film in the subsequent process can be attached to the solder ribbon. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the battery string production equipment in an embodiment of the present invention;

[0050] Figure 2 This is a partial structural diagram of the battery string production equipment in an embodiment of the present invention;

[0051] Figures 3 to 6 This is a schematic diagram of the film application process in an embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of a battery string consisting of stacked and welded battery cells and solder ribbons.

[0053] Figure 8 This is a partial structural diagram of the battery string;

[0054] Figures 1 to 8 The device includes: a front film feeding device 1, a back film feeding device 2, a back film adsorption device 3, a back film applying device 4, a front film adsorption device 5, a front film applying device 6, a back film cutting device 7, a front film cutting device 8, a conveying device 9, and a pressing device 10.

[0055] Back film A, solder strip B, front film C. Detailed Implementation

[0056] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] In existing methods of stringing solar cells, adhesive is applied to the cells and solder ribbons during the stacking process to bond them together. However, the adhesion between the cells and solder ribbons is poor, which reduces the production quality of the solar cell strings.

[0058] To address this problem, the present invention provides a ribbon laminating device that automatically applies a front film and a back film alternately to the front and back sides of the ribbon, thereby achieving automated production of ribbons with both front and back films. Using this ribbon with front and back films for stringing battery cells allows for direct stringing of the cells, improves the adhesion between the cells and the ribbon, and ultimately enhances the quality of the battery string.

[0059] Please refer to Figures 1 to 6 As shown, the welding strip film application device provided by the present invention includes a welding strip feeding device (not shown), a welding strip traction device (not shown), a front film application device 6, a back film application device 4, a front film adsorption device 5, and a back film adsorption device 3, wherein:

[0060] The welding strip traction device pulls out multiple parallel welding strips from the welding strip feeding device.

[0061] The front film applicator 6 and the back film applicator 4 are located between the welding strip feeding device and the welding strip traction device.

[0062] The front film adsorption device 5 and the front film application device 6 are arranged opposite to each other. The front film adsorption device 5 adsorbs the front film to be applied, and the front film application device 6 applies the front film C adsorbed by the front film adsorption device 5 to the front of the welding ribbon B pulled out by the welding ribbon traction device.

[0063] The back film adsorption device 3 and the back film application device 4 are arranged opposite to each other. The back film adsorption device 3 adsorbs the back film to be applied, and the back film application device 4 applies the back film A adsorbed by the back film adsorption device 3 to the back of the welding strip B pulled out by the welding strip traction device. The front film C and the back film A applied on the welding strip are distributed alternately.

[0064] It should be noted that the front and back sides of the solder strip described in this application are only used to indicate the orientation of the front and back films relative to the solder strip, and do not refer to the actual surface of the solder strip. In practical applications, the solder strip can be a circular solder strip, a triangular solder strip, or an irregularly shaped solder strip composed of alternating circular and triangular solder strip segments.

[0065] Optional, such as Figures 3 to 6 As shown, the welding ribbon laminating device provided by the present invention further includes a front film cutting device 8 and a back film cutting device 7, wherein: the front film cutting device 8 is located at the post-processing station of the front film adsorption device 5, and cuts the front film at the position between the front film adsorbed by the front film adsorption device 5 and the front film attached to the welding ribbon. The back film cutting device 7 is located at the post-processing station of the back film adsorption device 3, and cuts the back film at the position between the back film adsorbed by the back film adsorption device 3 and the back film attached to the welding ribbon.

[0066] Figures 3 to 6 In implementation, the welding strip traction device pulls the welding strip B horizontally, and the back film application device 4 and the front film application device 6 are arranged sequentially along the welding strip traction direction. Furthermore, the back film adsorption device 3 is located below the back film application device 4, and the front film adsorption device 5 is located above the front film application device 6. The following is a combination of... Figures 3 to 6 The specific film application process of the welding ribbon film application device in the embodiments of the present invention will be described by way of example:

[0067] like Figure 3 As shown, before the formal film application is carried out, multiple parallel welding ribbons B are controlled to pass between the front film adsorption device 5 and the front film application device 6, and between the back film adsorption device 3 and the back film application device 4, and the clamp 11 of the welding ribbon traction device is controlled to clamp the free end of the welding ribbon B.

[0068] Furthermore, the front film is pulled so that it wraps around the upper surface of the back film attaching device 4, and the first segment C of the front film of a predetermined length at its end is adsorbed onto the lower surface of the front film adsorption device 5. The free end of the back film is pulled so that the first segment A of the back film of a predetermined length at its end is adsorbed onto the upper surface of the back film adsorption device 3.

[0069] Begin applying the screen protector:

[0070] First, such as Figure 4 As shown, the front film adsorption device 5 descends toward the solder ribbon B to stack the first section of the front film C adsorbed thereon onto the front side of the solder ribbon B. Simultaneously, the back film adsorption device 3 rises toward the solder ribbon B to stack the first section of the back film A adsorbed thereon onto the back side of the solder ribbon B.

[0071] Subsequently, the front film applicator 6 applies the first section of front film C to the front of the welding strip B, and the back film applicator 4 applies the first section of back film A to the back of the welding strip B.

[0072] Next, as Figure 5 As shown, the control of the welding strip traction device pulls the welding strip B, causing the welding strip B to move a first predetermined distance along the welding strip traction direction (in the direction shown by the arrow in the figure), thereby causing the first section of the front film C attached to the front side of the welding strip B to be pulled out of the front film adsorption device 5 and the front film application device 6, and the first section of the back film A attached to the back side of the welding strip B to be pulled out of the back film adsorption device 3 and the back film application device 4.

[0073] Next, the front film adsorption device 5 is controlled to adsorb the second front film section located after the first front film section C, and the front film cutting device 8 is controlled to perform a cutting action, so that the first front film section C attached to the front side of the solder ribbon B is separated from the second front film section in the subsequent process. Simultaneously, the back film adsorption device 3 is controlled to adsorb the second back film section located after the first back film section A, and the back film cutting device 7 is controlled to perform a cutting action, so that the first back film section A attached to the back side of the solder ribbon B is separated from the second back film section in the subsequent process.

[0074] Finally, as Figure 6As shown, the control strip traction device continues to pull the strip B, causing the strip B to move a second predetermined distance along the strip traction direction, thereby pulling the attached first section of back film A out of the front film adsorption device 5 and the front film application device 6.

[0075] Repeat the above film application process to complete the application of the front and back films for each subsequent section.

[0076] Optionally, the back film adsorption device 3 includes a first driving mechanism and a back film adsorption plate, wherein the back film adsorption plate is connected to the driving end of the first driving mechanism, the back film adsorption plate is used to adsorb the back film, and the first driving mechanism is used to drive the back film adsorption plate to move toward or away from the solder ribbon. When the first driving mechanism drives the back film adsorption plate to move toward the solder ribbon B, the back film adsorbed on it can be stacked on the back side of the solder ribbon B.

[0077] Similarly, the front film adsorption device 5 includes a second driving mechanism and a front film adsorption plate. The front film adsorption plate is connected to the driving end of the second driving mechanism and is used to adsorb the front film. The second driving mechanism is used to drive the front film adsorption plate to move toward or away from the solder ribbon. When the second driving mechanism drives the front film adsorption plate to move toward the solder ribbon B, the front film adsorbed on it can be stacked on the front side of the solder ribbon B.

[0078] Optionally, the back film application device 4 includes a back film heating plate, such as... Figure 4 As shown, after the back film adsorption device 3 stacks the adsorbed back film A onto the back side of the solder ribbon B, the back film heating plate heats the back film A, causing it to soften and release its adhesive force, ultimately adhering to the back side of the solder ribbon B. Furthermore, the back film heating plate has multiple first solder ribbon guide grooves extending along the traction direction of the solder ribbon on its side surface facing the solder ribbon B, each first solder ribbon guide groove serving to guide one solder ribbon.

[0079] Similarly, the front film application device 6 includes a front film heating plate, such as... Figure 4 As shown, after the front film adsorption device 5 stacks the adsorbed front film C onto the front side of the solder ribbon B, the front film heating plate heats the front film C, causing it to soften and release its adhesive force, ultimately adhering to the front side of the solder ribbon B. Furthermore, multiple second solder ribbon guide grooves extending along the traction direction of the solder ribbon are provided on the surface of the front film heating plate facing the solder ribbon B, each second solder ribbon guide groove being used to guide one solder ribbon.

[0080] As mentioned earlier, the welding strip traction device needs to pull multiple parallel welding strips from the welding strip feeding device. To achieve feeding multiple parallel welding strips, the welding strip feeding device can optionally include multiple coils of welding strip, with each coil releasing one strip. The chuck of the welding strip traction device simultaneously pulls multiple parallel welding strips from multiple coils. For example, the chuck of the welding strip traction device is equipped with multiple gripper pieces corresponding one-to-one with multiple welding strip coils, each gripper piece used to hold and pull the welding strip released from the corresponding coil.

[0081] To save membrane resources and reduce the production cost of battery strings, this invention uses strip-shaped membrane strips to bond the solder strips to the battery cells.

[0082] To achieve this goal, such as Figure 1 and Figure 2 As shown, optionally, the welding strip film application device of the present invention further includes a front film feeding device 1 and a back film feeding device 2, wherein:

[0083] The front film feeding device 1 is configured to supply multiple front films to the front film adsorption device 5 along the traction direction of the welding strips, with each front film correspondingly attached to one welding strip. Of course, if the spacing between the welding strips is small, each front film can also be correspondingly attached to two or more welding strips.

[0084] Similarly, the back film feeding device 2 is configured to supply multiple back films to the front film adsorption device 3 along the traction direction of the welding strips, with each back film correspondingly attached to one welding strip. Of course, if the spacing between the welding strips is small, each back film can also be correspondingly attached to two or more welding strips.

[0085] This invention also provides a battery string production device, such as... Figure 1 and Figure 2 As shown, the battery string production equipment includes the solder ribbon laminating device, solder ribbon cutting device (not shown), battery cell supply device (not shown), conveying device 9, and crimping device 10 mentioned in any of the above embodiments. Wherein:

[0086] The welding ribbon laminating device is used to alternately apply the front and back films to the welding ribbon to obtain a welding ribbon with the front and back films attached. For the specific laminating process, please refer to the relevant content above, which will not be repeated here.

[0087] The solder strip cutting device is used to cut solder strips with front and back films attached into solder strip assemblies, such as... Figure 8 As shown, the solder ribbon assembly includes a solder ribbon B, a front film C attached to the upper surface of the front section of the solder ribbon B, and a back film A attached to the lower surface of the rear section of the solder ribbon B.

[0088] The welding strip traction device is also used to place the welding strip assembly on the conveyor 9.

[0089] like Figure 7 As shown, the cell supply device is used to place cell sheets onto the conveying device 9, wherein the i-th cell sheet is stacked on the front of the rear portion of the i-th ribbon assembly, and the front portion of the (i+1)-th ribbon assembly is stacked on the i-th cell sheet, where i is any natural number greater than 0.

[0090] The crimping device 10 is used to crimp the stacked battery cells and welding ribbon assemblies together to form a battery string.

[0091] As can be seen, through the cooperation of the welding strip film application device, welding strip cutting device, battery cell supply device, conveying device 9 and pressing device 10, the battery string production equipment of the present invention realizes the automatic stringing of battery strings, thereby improving the production quality of battery strings.

[0092] Understandably, the crimping device 10 is configured to apply pressure to the stacked battery cells and ribbon assembly so that the ribbon assembly is bonded to the corresponding battery cell via the adhesive front and back films thereon, thereby forming a battery string.

[0093] Optionally, the crimping device 10 includes a lifting mechanism and a pressure plate, wherein: the pressure plate is connected to the drive end of the lifting mechanism, and when the lifting mechanism drives the pressure plate to descend, it presses the stacked battery cells and welding ribbon assemblies together.

[0094] Optionally, the conveying device 9 includes a mounting base, a conveyor belt drive mechanism, a conveyor belt, and a heating plate, wherein: the conveyor belt drive mechanism is mounted on the mounting base, the conveyor belt is mounted on the conveyor belt drive mechanism, the conveyor belt is used to carry and convey the welding strip assembly and the battery cells, and the conveyor belt drive mechanism is used to drive the conveyor belt to convey.

[0095] A heating plate is mounted on the mounting base and located below the conveyor belt. The heating plate is used to heat the stacked ribbon assembly and solar cells, thereby softening the front and back films on the ribbon assembly and enabling them to adhere. This ensures that the stacked solar cells and ribbon assembly can be bonded together after being pressed by the pressing device 10.

[0096] Of course, a heating structure can also be provided on the pressing device 10. For example, the pressing plate of the pressing device 10 can be set as a hot pressing plate with heating function. When the hot pressing plate presses the stacked battery cells and welding ribbon assembly, it simultaneously heats the welding ribbon assembly and battery cells, thereby softening the front film and back film on the welding ribbon assembly.

[0097] Optionally, the battery string production equipment of the present invention further includes a pressing fixture and a pressing fixture handling device for handling the pressing fixture. The pressing fixture handling device is configured such that, for each welding ribbon assembly placed on the conveying device 9, the pressing fixture handling device places a pressing fixture on the front film C of the placed welding ribbon assembly, thereby pressing the welding ribbon assembly onto the corresponding battery cell.

[0098] Optionally, the battery string production equipment of the present invention further includes a welding strip pressing device. The welding strip pressing device is located on the side of the welding strip cutting device close to the welding strip feeding device. The welding strip traction device pulls the welding strip covered with the front film and the back film through the welding strip pressing mechanism and the welding strip cutting device. After the welding strip pressing device presses the welding strip, the welding strip cutting device cuts the welding strip to obtain a welding strip assembly.

[0099] Optionally, the battery string production equipment of the present invention further includes a string cutting device, which is configured to divide the entire battery string with the front film and the back film stacked together into multiple independent battery strings of predetermined lengths.

[0100] This invention also provides a method for applying a solder ribbon coating, which can be implemented by the solder ribbon coating device and its corresponding control program described in the preceding embodiments. The solder ribbon coating method provided by this invention may include the following steps:

[0101] S100, pulling out multiple parallel welding strips;

[0102] S200, adsorb the i-th segment of the front film to be attached at the front film adsorption station, and attach the adsorbed i-th segment of the front film to the front of the pulled-out welding strip at the front film attachment station.

[0103] S300. At the back film adsorption station, the i-th segment of the back film to be attached is adsorbed. At the back film attaching station, the adsorbed i-th segment of the back film is attached to the back of the pulled-out welding strip. The front and back films attached to the welding strip are distributed alternately, and i is a natural number greater than 0.

[0104] Steps S200 and S300 can be executed sequentially or simultaneously.

[0105] like Figures 3 to 6 As shown, the solder ribbon bonding method of the present invention can be implemented using the solder ribbon bonding apparatus of the previous embodiment. Taking the bonding process of the first front film and the first back film as an example, the specific implementation process of the solder ribbon bonding method of the present invention is as follows:

[0106] The specific execution process of step S100 is as follows:

[0107] like Figure 3As shown, multiple parallel welding strips B are controlled to pass between the front film adsorption device 5 and the front film application device 6, and between the back film adsorption device 3 and the back film application device 4, and the clamp 11 of the welding strip traction device is controlled to clamp the free end of the welding strip B.

[0108] In addition, the front film is pulled so that it wraps around the upper surface of the back film attaching device 4, and the first segment of the front film C of a predetermined length at the end is adsorbed onto the lower surface of the front film adsorption device 5; the free end of the back film is pulled so that the first segment of the back film A of a predetermined length at the end is adsorbed onto the upper surface of the back film adsorption device 3.

[0109] Steps 200 and 300 are executed in parallel, as follows:

[0110] like Figure 4 As shown, the front film adsorption device 5 located at the front film adsorption station is controlled to descend toward the welding ribbon B so as to stack the first section of front film C adsorbed on it onto the front side of the welding ribbon B. Then, the front film attaching device 6 located at the front film attaching station attaches the first section of front film C onto the back side of the welding ribbon B.

[0111] Synchronously, the back film adsorption device 3 located at the back film adsorption station is controlled to rise toward the welding strip B so as to stack the first back film A adsorbed on it onto the back of the welding strip B. Then, the back film attaching device 4 located at the back film attaching station attaches the first back film A onto the back of the welding strip B.

[0112] Optionally, after attaching the i-th front film and the i-th back film to the upper and lower surfaces of the solder ribbon B, the solder ribbon film attaching method of the present invention further includes the following steps:

[0113] S400: The welding strip with the i-th front film and the i-th back film attached is continued to be pulled forward a first predetermined distance, so that the i-th front film and the i-th back film attached to the welding strip advance the welding strip a first predetermined distance.

[0114] S500: At the front film adsorption station, the i+1th segment of the front film to be attached is adsorbed, and the front film is cut at the position between the adsorbed i+1th segment of the front film and the ith segment of the front film attached to the solder ribbon.

[0115] S600: At the back film adsorption station, the (i+1)th back film to be attached is adsorbed, and the back film is cut at the position between the adsorbed (i+1)th back film and the i-th back film attached to the solder ribbon.

[0116] Steps S500 and S600 can be executed sequentially or simultaneously.

[0117] Continue to refer to Figures 3 to 6As shown, taking the application process of the first front film and the first back film as an example, the specific implementation process of steps S400 to S600 is as follows:

[0118] The specific execution process of step S400 is as follows:

[0119] like Figure 5 As shown, the control of the welding strip traction device pulls the welding strip B, causing the welding strip B to move a first predetermined distance along the welding strip traction direction (in the direction shown by the arrow in the figure), thereby causing the first section of the front film C attached to the front side of the welding strip B to be pulled out of the front film adsorption device 5 and the front film application device 6, and the first section of the back film A attached to the back side of the welding strip B to be pulled out of the back film adsorption device 3 and the back film application device 4.

[0120] Steps S500 and S600 are executed in parallel, specifically as follows:

[0121] The front film adsorption device 5 is controlled to adsorb the second front film located after the first front film C, and the front film cutting device 8 is controlled to perform a cutting action, so that the first front film C attached to the front of the welding ribbon B is separated from the second front film in the subsequent process.

[0122] Simultaneously, the back film adsorption device 3 is controlled to adsorb the second back film located after the first back film A, and the back film cutting device 7 is controlled to perform a cutting action, so that the first back film A attached to the back of the welding ribbon B is separated from the second back film in the subsequent process.

[0123] Optionally, after cutting the i-th segment of the front film and the i-th segment of the back film attached to the solder ribbon B, the solder ribbon laminating method of the present invention further includes the following step: continuing to pull the solder ribbon forward a second predetermined distance. This allows the unlaminated solder ribbon to enter the front film adsorption station and the back film laminating station in the subsequent process.

[0124] The second predetermined distance can be the same as the first predetermined distance, or it can be the same as the first predetermined distance. In specific embodiments, the first predetermined distance and the second predetermined distance can be set as needed.

[0125] Next, the film application operation is carried out on the (i+1)th segment of the front film and the (i+1)th segment of the back film.

[0126] The present invention has been described above in sufficient detail and with certain specificities. Those skilled in the art should understand that the descriptions in the embodiments are merely exemplary, and all changes made without departing from the true spirit and scope of the invention should fall within the protection scope of the invention. The scope of protection claimed by the present invention is defined by the claims, and not by the above descriptions in the embodiments.

Claims

1. A welding strip film application device, characterized in that, The welding ribbon film application device includes a welding ribbon feeding device, a welding ribbon traction device, a front film application device, a back film application device, a front film adsorption device, and a back film adsorption device, wherein: The welding strip traction device is configured to pull out multiple parallel welding strips from the welding strip feeding device. The front film applicator and the back film applicator are located between the welding strip feeding device and the welding strip traction device; The front film adsorption device and the front film application device are arranged opposite to each other. The front film adsorption device is configured to adsorb the front film to be applied, and the front film application device is configured to apply the front film adsorbed by the front film adsorption device to the front side of the welding strip pulled out by the welding strip traction device. The back film adsorption device and the back film application device are arranged opposite to each other. The back film adsorption device is configured to adsorb the back film to be applied, and the back film application device is configured to apply the back film adsorbed by the back film adsorption device to the back of the welding ribbon pulled out by the welding ribbon traction device. The front film and back film applied on the welding ribbon are distributed alternately. The welding ribbon application device also includes a front film cutting device and a back film cutting device, wherein: The front film cutting device is located at the downstream station of the front film adsorption device. The front film cutting device is configured to cut the front film at a position between the front film adsorbed by the front film adsorption device and the front film attached to the welding strip. The back film cutting device is located at the downstream station of the back film adsorption device. The back film cutting device is configured to cut the back film at a position between the back film adsorbed by the back film adsorption device and the back film attached to the welding strip.

2. The welding strip film application device as described in claim 1, characterized in that, The back film application device and the front film application device are arranged sequentially along the welding strip traction direction; The back film adsorption device is located below the back film application device; The front film adsorption device is located above the front film application device.

3. The welding strip film application device as described in claim 1, characterized in that: The back film adsorption device includes a first driving mechanism and a back film adsorption plate, wherein the back film adsorption plate is connected to the driving end of the first driving mechanism, the back film adsorption plate is used to adsorb the back film, and the first driving mechanism is used to drive the back film adsorption plate to move toward or away from the welding strip. The front membrane adsorption device includes a second driving mechanism and a front membrane adsorption plate, wherein the front membrane adsorption plate is connected to the driving end of the second driving mechanism, the front membrane adsorption plate is used to adsorb the front membrane, and the second driving mechanism is used to drive the front membrane adsorption plate to move toward or away from the welding strip.

4. The welding strip film application device as described in claim 1, characterized in that: The back film application device includes a back film heating plate, and the back film heating plate has multiple first welding strip guide grooves extending along the traction direction of the welding strip on one side surface facing the welding strip. The front film application device includes a front film heating plate, and a plurality of second welding strip guide grooves extending along the traction direction of the welding strip are provided on the side surface of the front film heating plate facing the welding strip.

5. The welding strip film application device as described in claim 1, characterized in that, The welding strip feeding device includes multiple welding strip rolls wound with welding strip, and each welding strip roll releases one welding strip; The welding strip film application device further includes a front film feeding device and a back film feeding device, wherein: The front film feeding device is configured to supply multiple front films to the front film adsorption device along the traction direction of the welding strip, each front film corresponding to at least one welding strip; The back film feeding device is configured to supply multiple back films to the front film adsorption device along the traction direction of the welding strip, with each back film corresponding to at least one welding strip.

6. A battery string production device, characterized in that, The battery string production equipment includes a solder strip laminating device, a solder strip cutting device, a battery cell supply device, a conveying device, and a pressing device as described in any one of claims 1 to 5, wherein: The welding strip cutting device is used to cut welding strips with front and back films attached into welding strip assemblies. The welding strip traction device is also used to place the welding strip assemblies on the conveying device. Each welding strip assembly includes a welding strip, a front film attached to the front portion of the welding strip, and a back film attached to the rear portion of the welding strip. The battery cell providing device is used to place battery cells onto the conveying device; wherein the i-th battery cell is stacked on the front of the rear portion of the i-th solder ribbon assembly, and the front portion of the (i+1)-th solder ribbon assembly is stacked on the i-th battery cell, where i is any natural number greater than 0. The crimping device is used to crimp the stacked battery cells and solder ribbon assemblies together to form a battery string.

7. The battery string production equipment as described in claim 6, characterized in that, The conveying device includes a mounting base, a conveyor belt drive mechanism, a conveyor belt, and a heating plate, wherein: The conveyor belt drive mechanism is mounted on the mounting base; The conveyor belt is mounted on the conveyor belt drive mechanism. The conveyor belt is used to carry and transport the welding strip assembly and the battery cells. The conveyor belt drive mechanism is used to drive the conveyor belt to transport the components. The heating plate is mounted on the mounting base and located below the conveyor belt.

8. The battery string production equipment as described in claim 6, characterized in that, The pressing device includes a lifting mechanism and a pressure plate, wherein: The pressure plate is connected to the drive end of the lifting mechanism. When the lifting mechanism drives the pressure plate to descend, it presses the stacked battery cells and welding ribbon assemblies together.

9. The battery string production equipment as described in claim 6, characterized in that, The battery string production equipment also includes a clamping fixture and a clamping fixture handling device for transporting the clamping fixture. The clamping fixture handling device is configured such that for each of the welding strip assemblies placed on the conveying device, a clamping fixture is placed on the front film of the placed welding strip assembly.

10. A method for applying a film to solder strip, characterized in that, The method for applying film to the solder strip includes: Multiple parallel welding strips are pulled out; At the front film adsorption station, the i-th segment of the front film to be attached is adsorbed, and at the front film attachment station, the adsorbed i-th segment of the front film is attached to the front of the pulled-out welding ribbon. At the back film adsorption station, the i-th segment of back film to be attached is adsorbed. At the back film attachment station, the adsorbed i-th segment of back film is attached to the back of the pulled-out solder ribbon. The front and back films attached to the solder ribbon are distributed alternately, and i is a natural number greater than 0. After attaching the adsorbed i-th segment of back film to the back of the pulled-out solder ribbon at the back film attachment station, the solder ribbon film attachment method further includes: The welding strip with the i-th front film and the i-th back film attached is pulled forward a first predetermined distance, so that the i-th front film and the i-th back film attached to the welding strip move forward the first predetermined distance with the welding strip; At the front film adsorption station, the (i+1)th segment of the front film to be attached is adsorbed, and the front film is cut at the position between the adsorbed (i+1)th segment of the front film and the i-th segment of the front film attached to the solder ribbon. At the back film adsorption station, the (i+1)th back film segment to be attached is adsorbed, and the back film is cut at the position between the adsorbed (i+1)th back film segment and the i-th back film segment attached to the solder ribbon.

11. The method for applying a film to the solder strip as described in claim 10, characterized in that, After cutting the back film at the position between the (i+1)th segment of the adsorbed back film and the i-th segment of the back film attached to the solder ribbon, the solder ribbon bonding method further includes: The welding strip is then pulled forward a second predetermined distance; At the front film attaching station, the (i+1)th segment of the front film adsorbed on the front side of the solder strip is attached. At the back film attaching station, the adsorbed i+1 segment of back film is attached to the back of the solder strip.

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