Battery stringing method and device

Abstract

The present invention provides a method and device for stringing battery cells. The stringing method includes: placing a solder tape on the front side of a first battery cell, and then using a first adhesive film to fixedly attach the placed solder tape to the front side of the first battery cell, and leaving a connection section of the solder tape extending beyond the end of the first battery cell; flipping the first battery cell so that its back side faces up, and controlling the solder tape gripper of the battery cell flipping mechanism to grip the free end of the connection section before and during the flipping of the first battery cell; after flipping, using a solder tape press to position the connection section of the solder tape, and releasing the clamping of the first battery cell and the connection section after the solder tape press is in place; using an overall handling mechanism to integrally handle and place the first battery cell and the solder tape press on a stringing transportation platform, and placing the connection section and the solder tape press on the back side of a second battery cell. The present invention can effectively avoid the phenomenon of displacement deviation caused by the rebound of the solder tape connection section, thereby improving the electrical conductivity of the final battery string.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cell string preparation, and particularly relates to a method and device for stringing cells. Background Art

[0002] The photovoltaic panel of a photovoltaic module is formed by connecting and splicing multiple cell strings through busbars, and a cell string is formed by connecting multiple cells through solder tapes. When laying a solder tape on a cell, the solder tape needs to be connected to the grid line of the cell.

[0003] Common methods for connecting solder tapes to cells in main-gridless cells include welding connection, dispensing connection, and film strip connection. Since the welding connection method has a high cost and the dispensing connection method has a problem of poor electrical conductivity, the film strip connection is generally favored in the industry.

[0004] In the existing process of stringing cells with film strip connection of solder tapes, it is necessary to laminate the solder tapes on the front and back of the cells respectively. When laminating the solder tape on the back of the cell, it is necessary to flip the cell and the solder tape laminated on the front, and then attach the connection section reserved for the back lamination of the solder tape on the front of the latter cell to the back of the former cell, and then perform the back lamination of the cell string to finally form a cell string.

[0005] In the prior art, when turning the solder tape over and placing it on the back of the cell, it is necessary to loosen the jaws of the turning mechanism that clamp the solder tape to facilitate turning and clamping the next cell. When the jaws of the turning mechanism are loosened, there is a problem that the solder tape rebounds, resulting in the position of the solder tape shifting, which affects the electrical conductivity of the final cell string. Summary of the Invention

[0006] The method and device for stringing cells designed by the present invention can overcome the deficiency in the prior art that during the process of stringing cells, after the solder tape on the front of the cell is laminated and connected, before laminating the solder tape on the back, it is necessary to loosen the solder tape jaws of the turning mechanism after turning the cell and the solder tape thereon as a whole, resulting in the position shift of the solder tape connection section due to rebound and reducing the electrical conductivity of the final cell string.

[0007] The object of the present invention is to provide a method for stringing cells, including the following steps:

[0008] Solder tape lamination connection step on the front of the cell: After placing a solder tape on the front of the first cell, use a first adhesive film to fixedly attach the placed solder tape to the front of the first cell, and reserve a connection section of the solder tape extending beyond the end of the first cell;

[0009] a cell flipping step, using a cell flipping mechanism to flip the first cell with the front film connected to the solder ribbon upside down so that the back of the first cell faces upward, and controlling the solder ribbon clamp of the cell flipping mechanism to clamp the free end of the connecting section before and during the flipping of the first cell;

[0010] a solder ribbon presser placement step, wherein after the cell flipping mechanism flips the first cell connected to the solder ribbon upside down, the solder ribbon presser is used to position the connecting section of the solder ribbon, and after the solder ribbon presser is placed in place, the cell flipping mechanism releases the clamping of the first cell and the connecting section;

[0011] an overall transport step, using an overall transport mechanism to transport the first solar cell and the solder ribbon press as a whole and place them on a string transport platform pre-placed with the second solar cell, with the connecting section of the solder ribbon and the solder ribbon press placed on the back side of the second solar cell;

[0012] The step of connecting the back side of the cell with a soldering tape and a film is to use a second adhesive film to fix the connecting section of the soldering tape on the back side of the second cell.

[0013] In some embodiments, the step of connecting the front side of the battery cell with a welding tape coating is performed on a turntable composite platform. The turntable composite platform has a battery cell loading station, a welding tape placement station, a first adhesive film attaching station and a flipping station arranged around the rotating axis of the turntable composite platform. The battery cell flipping step is performed at the flipping station. The first adhesive film attaching station has two circumferentially spaced stations along the turntable composite platform, and a film conveying mechanism is respectively provided for the two first adhesive film attaching stations. The two film conveying mechanisms are used to respectively convey and attach the first films prepared by the same first film preparation mechanism to the front sides of the battery cells at each first film attaching station.

[0014] In some embodiments, a receiving platform is provided between the flipping station and the string transport platform, and the receiving platform is used to receive the first battery cell and the corresponding solder ribbon press after being flipped upside down by the battery cell flipping mechanism.

[0015] In some embodiments, a battery cell loading mechanism is provided at a position corresponding to the battery cell loading station of the turntable composite platform, and the battery cell loading mechanism has two battery cell loading lines and four battery cell loading lines, wherein the size of the battery cells supplied by the two battery cell loading lines is twice the size of the battery cells supplied by the four battery cell loading lines, and the two battery cell loading lines and the four battery cell loading lines can be controlled to switch operation.

[0016] In some embodiments, the turntable composite platform is provided with a plurality of battery cell placement platforms. Each of the battery cell placement platforms is arranged at intervals around the rotation axis of the turntable composite platform. And each of the battery cell placement platforms includes two sub-placement platforms of equal size. The distance between the two sub-placement platforms within the same battery cell placement platform can be adjusted. When the battery cells loaded by the battery cell loading mechanism are provided by the two-cell loading line, the two sub-placement platforms can be adjusted to be radially adjacent to each other. When the battery cells loaded by the battery cell loading mechanism are provided by the four-cell loading line, the two sub-placement platforms can be adjusted to be radially away from each other.

[0017] In some embodiments, each of the sub-placement platforms and / or the series transportation platform has a heating function.

[0018] In some embodiments, a solder tape preparation mechanism is provided at a position corresponding to the solder tape placement station of the turntable composite platform. The solder tape preparation mechanism includes a first solder tape prefabrication platform and / or a second solder tape prefabrication platform. The solder tape preparation mechanism prepares a solder tape segment with a first preset length through its primary cutting component. The solder tape segment can be placed on the first solder tape prefabrication platform and the second solder tape prefabrication platform. Both the first solder tape prefabrication platform and the second solder tape prefabrication platform are provided with secondary cutting components capable of cutting the solder tape segment placed thereon into two segments. When the battery cells loaded by the battery cell loading mechanism are provided by the four-cell loading line, control the secondary cutting components on the first solder tape prefabrication platform and / or the second solder tape prefabrication platform to operate to cut the solder tape segment placed thereon into two segments of equal length, and then place each prepared solder tape segment on the front surface of the first battery cell.

[0019] In some embodiments, the second adhesive film includes multiple segments. The part of the connection segment on the back surface of the second battery cell covered by the solder tape press is the first part, and the part not covered by the solder tape press is the second part. When using the second adhesive film to fixedly attach the connection segment of the solder tape to the back surface of the second battery cell, first attach and fix part of the second adhesive film to the second part, then remove the solder tape press from the back surface of the second battery cell, and then attach and fix the remaining second adhesive film to the first part.

[0020] In some embodiments, the second adhesive film is prepared by a second adhesive film preparation mechanism. The second adhesive film preparation mechanism can first prepare a film segment equal in length to the first battery cell, and then cut the film segment into multiple segments.

[0021] The present invention also provides a battery string forming device, including:

[0022] A turntable composite platform is used to perform ribbon lamination on the front side of the first battery cell;

[0023] A receiving platform, used to receive the first battery cell and the corresponding welding ribbon press after being turned upside down;

[0024] A cell flipping mechanism, used to flip the first cell after the front side is coated with a welding tape upside down and place it on the receiving platform;

[0025] A string transport platform, used to transport the cells thereon along the string direction;

[0026] The integral transport mechanism is used to transport the first battery cell and the solder ribbon press on the receiving platform as a whole and place them on the string transport platform.

[0027] The battery string forming method and device of the present invention controls the solder ribbon clamp of the battery cell flipping mechanism to be in a clamping state before placing the solder ribbon press to limit the connecting section of the solder ribbon, that is, to form a reliable clamping of the free end of the solder ribbon connecting section, and controls the battery cell flipping mechanism to separate from the battery cell after the solder ribbon press is placed on the solder ribbon to limit each solder ribbon, that is, the solder ribbon clamp of the battery cell flipping mechanism releases its clamping effect (that is, loosens) after the solder ribbon connecting section is reliably limited by the solder ribbon press. This can effectively avoid the phenomenon in the prior art that the solder ribbon clamp of the battery cell flipping mechanism is loosened after the battery cell is turned over, resulting in the rebound and displacement of the solder ribbon connecting section, thereby improving the conductive performance of the final battery string. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic diagram of the steps of a method for stringing batteries in an embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the layout of the battery string device in an embodiment of the present invention (simple schematic);

[0030] Figure 3 This is a side view (simple schematic) of a battery string formed using the stringing method of the present invention. The figure shows that the film segment of the second film is evenly cut into three sections, of which the left and right sections are attached at the back film primary attachment station, and the middle section is attached at the back film secondary attachment station. The first and second battery cells in the figure are identical battery cells, and the only difference between the two is the order of their transmission direction.

[0031] In the figure: 1. Bundle transport platform; 2. Turntable composite platform; 21. Cell placement platform; 211. Sub-placement platform; 3. Receiving platform; 4. First adhesive film preparation mechanism; 41. Adhesive film transport mechanism; 42. Film strip pre-placement conveyor belt; 5. Welding strip preparation mechanism; 51. First welding strip prefabrication platform; 52. Second welding strip prefabrication platform; 53. Welding strip tightening clamp; 54. Welding strip conveying device; 55. Primary cutting component; 56. Welding strip feeding device; 6. Second adhesive film preparation mechanism; 61. Back film primary attachment station; 62. Back film secondary attachment station Attaching station; 7. Cell flipping mechanism; 8. Overall transport mechanism; 9. Cell loading mechanism; 91. Two-cell feeding box; 92. Four-cell feeding box; 93. Conveyor belt; 94. Slicing device; 95. Flipping device; 96. Defect detection device; 97. Correction device; 101. Heating device; 102. Film rolling device; 103. Cooling device; 104. String cutting device; 105. Press placement and recovery device; 201. Cell loading station; 202. Solder ribbon placement station; 203 First film attaching station; 204. Flipping station. DETAILED DESCRIPTION

[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. In the figures, regions and layer thicknesses are exaggerated for clarity. Identical reference numerals in the figures denote identical or similar structures, and thus detailed descriptions thereof will be omitted.

[0033] The described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be employed. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present invention.

[0034] The following examples illustrate the battery stringing method and apparatus of the present invention. These examples are only a portion of the embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. All other embodiments devised by persons of ordinary skill in the art without inventive effort are intended to fall within the scope of protection of the present invention.

[0035] Please refer to Figures 1 to 3 According to an embodiment of the present invention, a method for stringing batteries is provided, comprising the following steps:

[0036] The steps of connecting the front side of the solar cell with a film-covered soldering ribbon: Place the soldering ribbon (i.e., a soldering ribbon segment with a first preset length. In practical applications, it usually includes multiple soldering ribbons with the same first preset length, and the specific number can be reasonably selected according to actual production needs, and each soldering ribbon should correspond one by one to the grid lines on the solar cell) on the front side of the first solar cell, and then use a first adhesive film (with one side being the bonding surface) to fixedly attach the placed soldering ribbon to the front side of the first solar cell, and leave a connection segment of the soldering ribbon extending beyond the end of the first solar cell. The aforementioned first preset length is the sum of the lengths of two solar cells, and the length of the connection segment is generally half of the aforementioned first preset length, that is, the length of one solar cell;

[0037] The step of flipping the solar cell: Use the solar cell flipping mechanism 7 to flip the first solar cell with the film-covered soldering ribbon on the front side up and down, that is, flip it 180° so that the back side of the first solar cell faces up and the front side faces down. Before and during the flipping of the first solar cell, control the soldering ribbon gripper of the solar cell flipping mechanism 7 to grip the free end of the connection segment. The aforementioned solar cell flipping mechanism 7 is generally configured with a negative pressure adsorption hole capable of adsorbing the solar cell and a soldering ribbon gripper capable of gripping the soldering ribbon. A solar cell flipping mechanism in the prior art can be used, and the present invention does not make specific improvements to its specific structure;

[0038] The step of placing the soldering ribbon press: After the solar cell flipping mechanism 7 flips the first solar cell connected with the soldering ribbon up and down, use a soldering ribbon press (not shown and not indexed in the figure) to clamp and position the connection segment of the soldering ribbon (for example, the bottom side of the soldering ribbon press can be provided with clamping grooves corresponding one by one to the positions of each soldering ribbon, and each clamping groove is formed by two relatively arranged jaws, and the clamping and release of the corresponding soldering ribbon are realized by controlling the approach or separation of the two jaws), and after the soldering ribbon press is placed in place, release the adsorption of the first solar cell and the clamping of the connection segment by the solar cell flipping mechanism 7, that is, control the solar cell flipping mechanism 7 to disengage from the first solar cell;

[0039] The overall handling step: Use the overall handling mechanism 8 to integrally handle and place the first solar cell and the soldering ribbon press on the series transportation platform 1 pre-placed with the second solar cell, and make the connection segment of the soldering ribbon and the soldering ribbon press placed on the back side of the second solar cell. The aforementioned overall handling mechanism 8, for example, has a vacuum adsorption plate capable of adsorbing the solar cell and a press gripper capable of clamping the soldering ribbon press (not shown in the figure). The present application does not particularly limit the structure of the overall handling mechanism 8. In theory, any structure that can realize the reliable simultaneous and synchronous displacement of the solar cell and the soldering ribbon press is acceptable. The aforementioned soldering ribbon press can use a soldering ribbon press in the prior art. The soldering ribbon press has limit grooves corresponding one by one to the positions of each soldering ribbon, and each soldering ribbon is correspondingly limited in each limit groove. As the prior art, the present invention does not limit its specific structure;

[0040] The steps of connecting the backside solder tape of the solar cell with a film are as follows: the connecting section of the solder tape is fixedly attached to the backside of the second solar cell by using the second film, thus realizing the series preparation of the second solar cell in the front and the first solar cell in the back. Repeating this process multiple times can form a battery string with the target number of cells. It should be noted that the aforementioned first solar cell and the second solar cell are objectively solar cells with the same shape and specifications. Since there is a front-back relationship in the series transmission direction, for the convenience of description and to ensure the clarity of the technical solution, the solar cell in the back is defined as the first solar cell, and the solar cell in the front is defined as the second solar cell. The front and back of the aforementioned solar cell are relative. Therefore, objectively, the aforementioned front can be the back, and correspondingly, the aforementioned back is the front.

[0041] In this technical solution, before placing the solder tape clamp to limit the connecting section of the solder tape, the solder tape jaws of the solar cell flipping mechanism 7 are always in the clamping state, that is, a reliable clamping of the free end of the connecting section of the solder tape is formed. After the solder tape clamp is placed on the solder tape to form a limit for each solder tape, the solar cell flipping mechanism 7 is then controlled to disengage from the solar cell, that is, the solder tape jaws of the solar cell flipping mechanism 7 release their clamping effect (that is, loosen) after the connecting section of the solder tape is reliably limited by the solder tape clamp. This can effectively avoid the phenomenon in the prior art that the solder tape jaws of the solar cell flipping mechanism loosen after the solar cell is turned over, resulting in the displacement and deviation of the connecting section of the solder tape, thereby improving the electrical conductivity of the final battery string.

[0042] In some embodiments, the steps of connecting the front-side solder tape of the solar cell with a film are carried out on the turntable composite platform 2. The turntable composite platform 2 has a solar cell loading station 201, a solder tape placement station 202, a first film attachment station 203, and a flipping station 204 arranged around the rotation axis of the turntable composite platform 2. For details, see Figure 2As shown, the foregoing solar cell loading station 201, solder tape placement station 202, first adhesive film attachment station 203, and flipping station 204 are arranged at intervals in a clockwise (or counterclockwise) order, so that the space occupied by the process of connecting the solder tape on the front side of the solar cell by laminating can be smaller. It can be understood that corresponding functional devices (components) are respectively arranged at the positions corresponding to the foregoing stations. For example, a solar cell loading mechanism 9 is arranged at the solar cell loading station 201, a solder tape preparation mechanism 5 is arranged at the solder tape placement station 202, a first adhesive film preparation mechanism 4 is arranged at the first adhesive film attachment station 203, and a solar cell flipping mechanism 7 is arranged at the flipping station 204, that is, the solar cell flipping step is carried out at the flipping station 204. There are two first adhesive film attachment stations 203 spaced along the circumferential direction of the turntable composite platform 2, and a film handling mechanism 41 is respectively arranged corresponding to the two first adhesive film attachment stations 203. The two film handling mechanisms 41 are used to respectively transport and attach the first adhesive film prepared by the same first adhesive film preparation mechanism 4 to the front sides of the solar cells at each first adhesive film attachment station 203. In this way, the working frequency of the film handling mechanism 41 can be significantly reduced when laminating the front side of the solar cell, which can better match the production speed and reduce the working speed requirement of the film handling mechanism 41. A film strip pre-placement conveyor belt 42 is configured at the first adhesive film preparation mechanism 4. After the film strip is pulled out from the film strip roll in the first adhesive film preparation mechanism 4, the film strip is vertically slit and spaced, and then adsorbed by a transverse film splitting disc (not shown in the figure) and transversely slit into a film strip with a length consistent with the length of the solder tape required to be attached to the front side of the first solar cell. The slit film strip is temporarily received by the film strip pre-placement conveyor belt 42. When the turntable composite platform 2 transports the first solar cell with the solder tape placed thereon to the first adhesive film attachment station 203, the film handling mechanism 41 transports the film strip on the film strip pre-placement conveyor belt 42 to the turntable composite platform 2 and pastes it to cover the solder tape on the front side of the first solar cell.

[0043] In some embodiments, a receiving platform 3 is provided between the flipping station 204 and the stringing transportation platform 1. The receiving platform 3 is used to receive the first solar cell after being flipped up and down by the solar cell flipping mechanism 7 and the corresponding solder tape pressing tool. The flipped first solar cell is placed on the receiving platform 3, and the solder tape pressing tool is placed on the receiving platform 3 to position the solder tape connection section of the first solar cell, which can prevent the flipped first solar cell from being directly placed on the downstream stringing transportation platform 1 and reducing the stringing efficiency. It can be understood that in order to ensure the accurate alignment of the limiting grooves of the solder tape pressing tool and each solder tape connection section, the solar cell needs to be in a static state. If the solar cell is placed on the stringing transportation platform 1 and the solder tape pressing tool is placed, the stringing transportation platform 1 needs to stop transporting when the solder tape pressing tool is placed, which will obviously reduce the stringing preparation efficiency. In a preferred embodiment, two or more of the aforementioned receiving platforms 3 can be configured, and each receiving platform 3 forms an alternating cyclic operation between the aforementioned stringing transportation platform 1 and the flipping station 204 to improve the overall handling rhythm of the first solar cell and the corresponding solder tape pressing tool, thereby enhancing the solar cell stringing efficiency.

[0044] In some embodiments, a solar cell loading mechanism 9 is provided at a position corresponding to the solar cell loading station 201 of the turntable composite platform 2. The solar cell loading mechanism 9 has a two-piece loading line and a four-piece loading line. Among them, the size of the solar cells supplied by the two-piece loading line is twice the size of the solar cells supplied by the four-piece loading line, and the two-piece loading line and the four-piece loading line can be controlled to switch and operate.

[0045] In this technical solution, the solar cell loading station 201 is simultaneously configured with a two-piece loading line and a four-piece loading line that can be switched and operated, so as to improve the compatibility of the equipment for the stringing preparation of different specifications of solar cells and meet the actual needs of different customers.

[0046] In a specific embodiment, refer to Figure 2As shown, the battery cell feeding mechanism 9 specifically includes a two-piece feeding cassette 91, a four-piece feeding cassette 92, a scribing device 94, a flipping device 95, a defect detection device 96, a centering device 97, and multiple conveyor belts 93. The two-piece feeding cassette 91 is used to store battery cells that need to be divided into two pieces, while the four-piece feeding cassette 92 contains relatively smaller battery cells that have been divided into four pieces. When battery cells for the two-piece feeding line are required, the two-piece feeding cassette 91 is put into use, and when battery cells for the four-piece feeding line are needed, the four-piece feeding cassette 92 is put into use. Each conveyor belt 93 is arranged between corresponding functional components to enable the operation of battery cells among the functional components. The aforementioned scribing device 94 (specifically, a laser scribing component in the prior art can be used) is used to divide the larger-sized battery cells taken out from the two-piece feeding cassette 91 into two battery half-cells. The aforementioned flipping device 95 adjusts the orientations of the battery half-cells divided on the two-piece feeding line to be consistent (for the battery cells on the four-piece feeding line, the directions of the battery half-cells are the arranged directions and do not need to be flipped). The defect detection device 96 and the centering device 97 both adopt the principle of visual detection to respectively detect the battery cells within their detection ranges. Among them, the defect detection device 96 detects the defects of the battery cells within its detection range to screen out defective battery cells, and the centering device 97 is used to center the battery cells to ensure that they can be reliably aligned and transported to the subsequent battery cell placement platform 21. These functional components can all adopt relevant functional components in the prior art, and the present invention does not make special limitations on them. It can be understood that through partial sharing of the aforementioned functional components (such as sharing two conveyor belts 93, the defect detection device 96, the centering device 97, etc. downstream in the battery cell feeding direction), the purpose of configuring both the two-piece feeding line and the four-piece feeding line in the battery cell feeding mechanism 9 is achieved, which can simplify costs and reduce space occupation.

[0047] In some embodiments, the turntable composite platform 2 is provided with a plurality of solar cell placement platforms 21 for placing the solar cells (i.e., the first solar cells) supplied at the solar cell loading station 201. The solar cell placement platforms 21 are arranged at intervals around the rotation axis of the turntable composite platform 2 so as to be able to switch the same solar cell between different working stations. Corresponding to the aforementioned solar cell loading mechanism 9 with two-piece loading lines and four-piece loading lines, each solar cell placement platform 21 includes two sub-placement platforms 211 of equal size. The size of the sub-placement platform 211 matches the size of the solar cells provided by the four-piece loading line. It can be understood that when the two aforementioned sub-placement platforms 211 are adjacent and combined into a solar cell placement platform 21, its size then matches the size of the solar cells provided by the two-piece loading line. The distance between the two sub-placement platforms 211 within the same solar cell placement platform 21 can be adjusted, that is, the two sub-placement platforms 211 have a combined state where they are adjacent to each other to carry one of the solar cells provided by the two-piece loading line and a separated state where they are away from each other to respectively carry two of the solar cells provided by the four-piece loading line. That is, when the solar cells loaded by the solar cell loading mechanism 9 are provided by the two-piece loading line, the two sub-placement platforms 211 can be adjusted to be radially adjacent to each other to be in the combined state, and when the solar cells loaded by the solar cell loading mechanism 9 are provided by the four-piece loading line, the two sub-placement platforms 211 can be adjusted to be radially away from each other to be in the separated state. At this time, subsequent operations such as solder tape placement and adhesive film attachment can be performed on two solar cells simultaneously, further improving the series preparation efficiency.

[0048] In some embodiments, each sub-placement platform 211 and / or the series transportation platform 1 has a heating function. For example, each sub-placement platform 211 is embedded with a corresponding electric heating sheet, which can heat the solar cells on it during the entire use process of the turntable composite platform to ensure reliable and smooth adhesion of the adhesive film to the front surface of the solar cells. For another example, as Figure 2 shown, a corresponding heating device 101 is provided at the series transportation platform 1 to heat the solar cells on the series transportation platform 1, making the film strips adhered to the solar cells more firm and reducing the probability of the film strips loosening during subsequent transportation.

[0049] In some embodiments, a solder ribbon preparation mechanism 5 is provided at a position corresponding to the solder ribbon placement station 202 of the turntable composite platform 2. The solder ribbon preparation mechanism 5 includes a first solder ribbon prefabrication platform 51 and / or a second solder ribbon prefabrication platform 52. The solder ribbon preparation mechanism 5 prepares a solder ribbon segment with a first preset length (corresponding to twice the length of the solar cells provided by the two-piece loading line) through its primary cutting component 55. The solder ribbon segment can be placed on the first solder ribbon prefabrication platform 51 and the second solder ribbon prefabrication platform 52. Both the first solder ribbon prefabrication platform 51 and the second solder ribbon prefabrication platform 52 are equipped with a secondary cutting component (not shown and not indexed in the figure) that can cut the solder ribbon segment placed thereon into two segments. When the solar cells loaded by the solar cell loading mechanism 9 are provided by the four-piece loading line, after controlling the secondary cutting component on the first solder ribbon prefabrication platform 51 and / or the second solder ribbon prefabrication platform 52 to operate to cut the solder ribbon segment placed thereon into two equal-length segments, then place each prepared solder ribbon segment (at this time, its length also corresponds to twice the length of a single solar cell provided by the four-piece loading line, and correspondingly to the length of a single solar cell provided by the two-piece loading line) on the front side of the first solar cell.

[0050] In this technical solution, secondary cutting components are respectively provided on the first solder ribbon prefabrication platform 51 and the second solder ribbon prefabrication platform 52 to cut the solder ribbon placed thereon into two segments, so that the length of the solder ribbon can match the length of the solar cells provided by the four-piece loading line. When the first solder ribbon prefabrication platform 51 and the second solder ribbon prefabrication platform 52 are configured simultaneously, the efficiency of preparing the solar cell string can be further improved, and the production capacity can be increased.

[0051] Similar to the solder tape preparation mechanism in the prior art, the aforementioned solder tape preparation mechanism 5 further includes two spaced-apart solder tape tensioning jaws 53 and a solder tape puller (not shown in the figure) for pulling out the solder tape. After the solder tape is pulled out from the solder tape roll, it successively passes through the upstream solder tape tensioning jaw 53, the downstream solder tape tensioning jaw 53, the aforementioned primary cutting component 55, the solder tape prefabrication platform (the first solder tape prefabrication platform 51 and / or the second solder tape prefabrication platform 52), the solder tape feeding device 56 and the solder tape conveying device 54. The solder tape conveying device 54 has a plurality of solder tape reels, and the solder tape on each reel is supplied downstream under the guiding and conveying of the solder tape conveying device 54 for cutting to form solder tape segments. The upstream solder tape tensioning jaw 53 and the downstream solder tape tensioning jaw 53 clamp the solder tape before cutting, and after the solder tape is clamped, the distance between the two solder tape tensioning jaws 53 is increased to tension the solder tape, facilitating the transportation of the solder tape to the primary cutting part 55 for cutting. After the solder tape puller pulls out the required length of the tensioned solder tape, the primary cutting component 55 cuts off the solder tape, and the cut solder tape falls onto the solder tape prefabrication platform for standby. When the battery cell is transported from the battery cell loading station 201 to the solder tape placement station 202, a tape handling mechanism (not shown in the figure) transports the solder tape on the solder tape prefabrication platform to the battery cell and positions it corresponding to the grid lines on the front surface of the battery cell.

[0052] In some embodiments, the second adhesive film includes multiple segments (as Figure 3 shown, the second adhesive film has three segments). The part of the connecting segment on the back surface of the second battery cell covered by the solder tape press is the first part, and the part not covered by the solder tape press is the second part. When using the second adhesive film to fixedly attach the connecting segment of the solder tape to the back surface of the second battery cell, first attach and fix part of the second adhesive film to the second part, then remove the solder tape press from the back surface of the second battery cell, and then attach and fix the remaining second adhesive film to the first part.

[0053] In this technical solution, the second adhesive film is designed in multiple segments. During specific attachment, first, the second part of the solder ribbon that is not covered by the solder ribbon press fixture is attached and fixed using a part of the second adhesive film. Then, after removing the solder ribbon press fixture, the remaining segment of the second adhesive film is used to attach the first part of the solder ribbon. This operation can prevent the situation in the prior art where, when using a whole piece of adhesive film to attach the entire solder ribbon on the back of the second solar cell, the solder ribbon press fixture occupies and interferes. It should be noted that in the prior art, in order to attach the part of the solder ribbon occupied by the solder ribbon press fixture, a warping section needs to be reserved in the whole piece of adhesive film at the position of the solder ribbon press fixture, and after removing the solder ribbon press fixture, the warping section is re-pressed. In this re-pressing and film pasting process, some air under the film cannot be discharged in time, resulting in the formation of bubbles during the re-pressing process, which will affect the processing quality of the subsequent lamination process. For example, the expansion of the bubbles during lamination heating may cause the solar cell to be crushed and the adhesion to be unreliable. In the present invention, the whole piece of adhesive film in the prior art is cut into multiple segments, and segmented attachment can avoid the above-mentioned adverse consequences brought by the warping and re-pressing of the adhesive film.

[0054] In some embodiments, the second adhesive film is prepared by the second adhesive film preparation mechanism 6. The second adhesive film preparation mechanism 6 can first prepare a film segment with the same length as the first solar cell, and then cut the film segment into multiple segments. This can ensure that the overall length of the multiple film segments is consistent with the length of the solar cell when attached to the back of the second solar cell. It should be noted that the lengths of the respective film segments can be the same or different, but the length of the film segment corresponding to the aforementioned first part cannot be shorter than the front-back width of the solder ribbon press fixture in the length of the solar cell.

[0055] Continue to refer to Figure 2 As shown, in a specific embodiment, along the transportation direction of the in-line transportation platform 1 (i.e., Figure 2 from left to right in the orientation shown), there are respectively provided a first back adhesive film attachment station 61 and a second back adhesive film attachment station 62. The first back adhesive film attachment station 61 is used to attach the film segment corresponding to the aforementioned second part, and the second back adhesive film attachment station 62 is used to attach the film segment corresponding to the aforementioned first part.

[0056] In the transportation direction of the in-line transportation platform 1, on the downstream side of the second back adhesive film attachment station 62, there are successively provided a film rolling device 102, a cooling device 103, and a string cutting device 104. Among them, the film rolling device 102 is used to apply pressure to the back of the battery string after the attachment of the back film strip is completed, reducing the probability of warping of the back film strip of the battery string to make the attachment more reliable. The cooling device 103 can quickly cool the rolled solar cell, ensuring the reliable attachment of the film strip. The string cutting device 104 is used to cut the in-line battery string to form a battery string including the target number of solar cells.

[0057] A jig placement and recycling device 105 is disposed adjacent to the in-line transportation platform 1, which is used to remove the solder tape jigs on the in-line transportation platform 1, recycle them therein, and send them back to the position where the aforementioned receiving platform 3 is located. A corresponding handling device is used to place the solder tape jigs on the solder tape connection sections of the first solar cell on the receiving platform 3 again, thereby forming a cycle of the solder tape jigs. An existing jig placement and recycling device in the prior art can be used, and the present invention does not make special limitations on it.

[0058] According to an embodiment of the present invention, there is also provided a battery string assembly device, including:

[0059] A turntable composite platform 2, which is used to laminate the solder tape on the front side of the first solar cell;

[0060] A solar cell feeding mechanism 9, which is used to provide the first solar cell and place the first solar cell on the solar cell placement platform 21 of the turntable composite platform 2;

[0061] A solder tape preparation mechanism 5, which is used to prepare a solder tape of a target length and place the solder tape of the target length on the front side of the first solar cell on the solar cell placement platform 21;

[0062] A first adhesive film preparation mechanism 4, which is used to prepare a first adhesive film and attach it to the front side of the first solar cell;

[0063] A receiving platform 3, which is used to receive the first solar cell that has been turned over up and down and the corresponding solder tape jigs;

[0064] A solar cell turning mechanism 7, which is used to turn the first solar cell with the front side solder tape laminated up and down and place it on the receiving platform 3;

[0065] An in-line transportation platform 1, which is used to transport each solar cell thereon along the in-line direction;

[0066] An overall handling mechanism 8, which is used to integrally handle and place the first solar cell and the solder tape jigs on the receiving platform 3 on the in-line transportation platform 1;

[0067] A second adhesive film preparation mechanism 6, which is used to prepare a second adhesive film and attach the prepared second adhesive film to the back side of the second solar cell.

[0068] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above-mentioned various methods can be freely combined and superimposed.

[0069] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for stringing battery strings, characterized in that, The steps include: a step of laminating the front side of the cell with a solder ribbon, wherein after placing a solder ribbon on the front side of the first cell, the solder ribbon is fixedly attached to the front side of the first cell using a first adhesive film, and a connection section of the solder ribbon is reserved that extends beyond the end of the first cell; a cell flipping step, using a cell flipping mechanism (7) to flip upside down a first cell with a front film connected to the soldering ribbon so that the back of the first cell faces upward, and controlling the soldering ribbon clamp of the cell flipping mechanism (7) to clamp the free end of the connecting section before and during the flipping of the first cell; a step of placing a soldering ribbon press, wherein after the cell flipping mechanism (7) flips the first cell connected to the soldering ribbon upside down, the soldering ribbon press is used to position the connecting section of the soldering ribbon, and after the soldering ribbon press is placed in place, the cell flipping mechanism (7) is released from clamping the first cell and the connecting section; an overall transport step, using an overall transport mechanism (8) to transport the first battery cell and the solder ribbon press as a whole and place them on a string transport platform (1) pre-placed with the second battery cell, and placing the connecting section of the solder ribbon and the solder ribbon press on the back of the second battery cell; The step of connecting the back side of the cell with a soldering tape and a film is to use a second adhesive film to fix the connecting section of the soldering tape on the back side of the second cell.

2. The method for connecting battery strings according to claim 1, wherein The step of connecting the front side of the cell with a soldering tape coating is performed on a turntable composite platform (2). The turntable composite platform (2) has a cell loading station (201), a soldering tape placement station (202), a first adhesive film attaching station (203) and a flipping station (204) arranged around the rotation axis of the turntable composite platform (2). The cell flipping step is performed at the flipping station (204). The first adhesive film attaching station (203) has two circumferentially spaced stations along the turntable composite platform (2), and the two first adhesive film attaching stations (203) are respectively provided with a film conveying mechanism (41). The two film conveying mechanisms (41) are used to respectively convey and attach the first adhesive film prepared by the same first adhesive film preparation mechanism (4) to the front side of the cell at each first adhesive film attaching station (203).

3. The method for stringing battery strings according to claim 2, wherein, A receiving platform (3) is provided between the flipping station (204) and the string transport platform (1), and the receiving platform (3) is used to receive the first battery cell and the corresponding welding ribbon press after being flipped upside down by the battery cell flipping mechanism (7).

4. The method for connecting battery strings according to claim 2, wherein, A cell loading mechanism (9) is provided at a position corresponding to the cell loading station (201) of the turntable composite platform (2), and the cell loading mechanism (9) has two cell loading lines and four cell loading lines, wherein the size of the cell supplied by the two cell loading lines is twice the size of the cell supplied by the four cell loading lines, and the two cell loading lines and the four cell loading lines can be controlled to switch operation.

5. The method for stringing battery strings according to claim 4, wherein, The turntable composite platform (2) is provided with a plurality of solar cell placement platforms (21). Each of the solar cell placement platforms (21) is arranged at intervals around the rotation axis of the turntable composite platform (2). Each of the solar cell placement platforms (21) includes two sub-placement platforms (211) of equal size. The distance between the two sub-placement platforms (211) within the same solar cell placement platform (21) can be adjusted. When the solar cells loaded by the solar cell loading mechanism (9) are provided by the two-piece loading line, the two sub-placement platforms (211) can be adjusted to be radially adjacent to each other. When the solar cells loaded by the solar cell loading mechanism (9) are provided by the four-piece loading line, the two sub-placement platforms (211) can be adjusted to be radially away from each other.

6. The method for stringing battery strings according to claim 5, wherein, Each of the sub-placement platforms (211) and / or the string transportation platform (1) has a heating function.

7. The method for stringing battery strings according to claim 4, characterized in that, A solder tape preparation mechanism (5) is provided at a position corresponding to the solder tape placement station (202) of the turntable composite platform (2). The solder tape preparation mechanism (5) includes a first solder tape prefabrication platform (51) and / or a second solder tape prefabrication platform (52). The solder tape preparation mechanism (5) prepares a solder tape segment with a first preset length through its primary cutting component (55). The solder tape segment can be placed on the first solder tape prefabrication platform (51) and the second solder tape prefabrication platform (52). Both the first solder tape prefabrication platform (51) and the second solder tape prefabrication platform (52) are provided with secondary cutting components capable of cutting the solder tape segment placed thereon into two segments. When the solar cells loaded by the solar cell loading mechanism (9) are provided by the four-piece loading line, control the secondary cutting components on the first solder tape prefabrication platform (51) and / or the second solder tape prefabrication platform (52) to operate to cut the solder tape segment placed thereon into two equal-length segments, and then place each prepared solder tape segment on the front surface of the first solar cell.

8. The method for stringing battery strings according to claim 1, wherein The second adhesive film includes multiple segments. The part of the connecting segment on the back surface of the second solar cell covered by the solder tape press is the first part, and the part not covered by the solder tape press is the second part. When using the second adhesive film to fixedly attach the connecting segment of the solder tape to the back surface of the second solar cell, first attach and fix part of the second adhesive film to the second part, then remove the solder tape press from the back surface of the second solar cell, and then attach and fix the remaining second adhesive film to the first part.

9. The method for stringing battery strings according to claim 8, wherein The second adhesive film is prepared by a second adhesive film preparation mechanism (6). The second adhesive film preparation mechanism (6) can first prepare a film segment equal in length to the first solar cell and then cut the film segment into multiple segments.

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