Photovoltaic cell string forming method

Abstract

The invention provides a photovoltaic cell string forming method. The photovoltaic cell string forming method comprises the steps that cell pieces are carried to a material receiving platform, and the front faces of the cell pieces face upwards; welding strips are arranged on the front faces of the battery pieces, and connecting sections protruding out of the end portions of the battery pieces are reserved on the welding strips; the film strip is attached to the front face of the battery piece so that the welding strips can be connected to the front face of the battery piece; the battery pieces are turned over, the back faces of the battery pieces are upwards placed on the bunching conveying platform, the connecting section of the welding strip on the rear battery piece on the bunching conveying platform is arranged on the back face of the front battery piece in a lap joint mode, and the free ends of the connecting section are correspondingly arranged in the clamping and positioning spaces of the welding strip pressing tool; the welding strip pressing tool is arranged on the bunching transportation platform so as to synchronously move along with the bunching transportation platform and the battery pieces on the bunching transportation platform; and attaching the film strip to the back surface of the battery piece. According to the invention, the problem of poor subsequent adhesive film attaching effect caused by position deviation of the welding strip in the string transportation process of the battery pieces is prevented, so that the string effect of the battery pieces is improved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic cell string manufacturing, and in particular to a method for stringing photovoltaic cells. Background Art

[0002] The photovoltaic panel of a photovoltaic module is composed of multiple battery strings connected to each other through bus bars, and the battery string is composed of multiple battery cells connected to each other through welding ribbons. When laying welding ribbons on the battery cells, it is necessary to connect the welding ribbons to the grid lines of the battery cells.

[0003] Common methods for connecting the welding ribbon and the cell without a main grid include welding connection, glue point connection, and film strip (film) connection. Since the welding connection method is more expensive and the glue point connection method has the problem of poor conductivity, the film strip connection is generally favored in the industry.

[0004] During the film strip connection process, not only the soldering tape on the front side of the battery cell needs to be coated and connected, but also the soldering tape connected to the back side of the battery cell needs to be coated and connected to the battery cell. This coating and connection process requires the front and back sides of the battery cell to be flipped over. The flipped battery cell is placed on the string transport platform with the back side facing up for coating and attachment of the soldering tape on the back side. The soldering tape on the rear battery cell is placed on the back side of the front battery cell. Position deviation is likely to occur when the soldering tape moves on the string transport platform, which is not conducive to the attachment of the adhesive strip on the back side of the battery cell. Summary of the invention

[0005] The photovoltaic cell stringing method designed in the present invention can overcome the shortcomings of the prior art in which the flipped cell sheets are placed on a stringing transport platform with their back sides facing upwards for laminating and attaching the back soldering strips, the soldering strips on the rear cell sheets are placed on the back side of the front cell sheets, and the soldering strips are prone to position deviations when moving on the stringing transport platform, which is not conducive to attaching the adhesive strips on the back side of the cell sheets.

[0006] The object of the present invention is to provide a method for stringing photovoltaic cells, comprising the following steps:

[0007] Carrying the battery cell onto the receiving platform with the front side of the battery cell facing upward;

[0008] Placing a preset number of prepared welding strips with a preset length on the front side of the battery cell, making each welding strip correspond to the grid line on the front side of the battery cell one by one, and leaving a connection section of each welding strip protruding from the end of the battery cell;

[0009] Attaching the prepared film strip to the front side of the battery cell to connect each of the welding strips to the front side of the battery cell;

[0010] Turn over the cell with the film strip and the soldering ribbon attached to the front side and place it on the string transport platform with the back side facing upwards, place the connecting section of the soldering ribbon on the rear cell on the string transport platform on the back side of the front cell and place the free end of the connecting section in the clamping and positioning spaces of the soldering ribbon presser, and place the soldering ribbon presser on the string transport platform to move synchronously with the string transport platform and the cells on the string transport platform;

[0011] The prepared film strip is attached to the back side of the battery cell to connect each of the welding strips to the back side of the battery cell.

[0012] In some embodiments, the string transport platform has a loading end on the upstream side of the battery cell conveying direction and a unloading end on the downstream side of the battery cell conveying direction, the loading end has an electromagnetic force applying structure, when the electromagnetic force applying structure is energized, the solder strip press at the loading end realizes left and right clamping and positioning of the free ends of each solder strip in each clamping and positioning space, when the electromagnetic force applying structure is de-energized, the solder strip press at the loading end releases the clamping and positioning of the free ends of each solder strip in each clamping and positioning space, before the next solar cell is placed on the string transport platform, the electromagnetic force applying structure is controlled to be in a de-energized state, and when the next solar cell is placed on the string transport platform and the free ends of the connecting sections of each solder strip are placed one by one in each clamping and positioning space, the electromagnetic force applying structure is controlled to be in a energized state.

[0013] In some embodiments, the string transport platform also has a middle section between the loading end and the unloading end, and permanent magnets are respectively provided on the left and right sides of the middle section, and the permanent magnets can enable each clamping and positioning space of each solder strip press corresponding to its position to form left and right clamping and positioning for the free end of each solder strip; and / or, a roller is provided at the unloading end, and the roller is used to apply pressure on the film strip on the back side of the battery cell at the unloading end; and / or, the photovoltaic cell stringing method also includes the step of transferring the solder strip press at the unloading end to the loading end by a press transfer mechanism.

[0014] In some embodiments, the welding strip press includes a press base, a movable seat and a plurality of clamping jaw modules, each of the clamping groups includes a first clamping jaw and a second clamping jaw that are relatively arranged, the first clamping jaw and the second clamping jaw are pivotally connected to the press base through a connecting pin, the clamping positioning space is formed between the lower ends of each of the first clamping jaw and the second clamping jaw, a first elastic member is clamped between the upper ends of the first clamping jaw and the second clamping jaw, the movable seat has a low position generated by its own gravity and a high position generated by an external lifting force, when the movable seat is in the low position, the clamping jaw module can release the clamping of the free end of the welding strip connecting segment in each of the clamping positioning spaces, when the movable seat is in the high position, the clamping jaw module can realize the clamping of the free end of the welding connecting segment in each of the clamping positioning spaces under the action of the first elastic member, and when the electromagnetic force applying structure is in the energized state, the movable seat is in the high position, and when the electromagnetic force applying structure is in the de-energized state, the movable seat is in the low position.

[0015] In some embodiments, in the same clamping jaw module, a clamping limit column is provided between the lower ends of the first clamping jaw and the second clamping jaw, and the clamping limit column is connected to the press base; and / or, for the same clamping jaw module, the upper ends of the first clamping jaw and the second clamping jaw are inclined structures extending close to each other, and the movable seat has force columns located on both sides of the upper ends of each clamping jaw module, and each force column is arranged in a one-to-one correspondence with each inclined structure; or,

[0016] A driving link is respectively provided at the left and right ends of the press base, and the driving link is pivotally connected to the press base, and the first end of the driving link is supported on the bottom side of the movable seat, and the second end of the driving link can be attracted by the electromagnetic force applying structure or the permanent magnet to rotate downward around the pivot connection point between it and the press base, and the first end and the second end are respectively located on both sides of the pivot connection point.

[0017] In some embodiments, guide rods are provided between the two ends of the movable seat and the press base, and a second elastic member is sleeved on the outer periphery of the guide rods, and the second elastic member is clamped between the movable seat and the press base.

[0018] In some embodiments, before the battery cells are transported to the receiving platform, a battery cell feeding device is used to divide the whole battery cell into a preset number of pieces, and the battery cells are preheated on a preheating platform before being transported to the receiving platform; and / or, the receiving platform has two groups, and the two groups of receiving platforms can be driven in the horizontal and vertical directions to alternately receive the battery cells, welding strips and film strips.

[0019] In some embodiments, the preparation of the solder strip is performed by a solder strip preparation device, which includes two groups of solder strip clamps, and the two groups of solder strip clamps are respectively arranged in one-to-one correspondence with each group of the material receiving platforms, and the two groups of solder strip clamps can be driven in the horizontal and vertical directions to alternately clamp and pull the cut ends of the solder strip; and / or, the flipping of the battery cell is performed by a flipping mechanism, which includes a first grasping platform and a second grasping platform, and the first grasping platform and the second grasping platform both have a solder strip positioning structure for positioning the connecting section.

[0020] In some embodiments, the solder strip preparation device includes a solder strip cutting mechanism, and a clamping platform is provided at the output end of the solder strip cutting mechanism for supporting the cut end of the solder strip of a preset length formed by cutting.

[0021] In some embodiments, a string cutting mechanism is further provided on the downstream side of the string transport platform for cutting the stringed battery strings into battery strings of target lengths; and / or, a heating mechanism capable of heating the battery cells is also provided on the string transport platform.

[0022] The photovoltaic cell stringing method of the present invention places a solder ribbon press on a stringing transport platform, so that the free ends of the solder ribbon connecting sections on the back side of the previous cell sheet can be reliably positioned by utilizing the clamping and positioning spaces of the solder ribbon press. The solder ribbon press can move synchronously with the movement of the stringing transport platform, effectively preventing the problem of poor subsequent adhesive film attachment effect caused by position displacement of the solder ribbon during the stringing transport of the cell sheets, thereby improving the cell stringing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the steps of a method for stringing photovoltaic cells in an embodiment of the present invention;

[0024] Figure 2 It is a simplified schematic diagram of the structure of a photovoltaic cell string device in an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the state of a battery string in an embodiment of the present invention during a stringing process, wherein the battery string is on a stringing transport platform;

[0026] Figure 4 yes Figure 2 A simplified schematic diagram of the structure of the processing equipment for the battery cell before being placed on the receiving platform, wherein the arrows in the figure indicate the transfer path of the battery cell, and the figure shows two preheating platforms;

[0027] Figure 5 Schematic diagram of the three-dimensional structure of the welding ribbon pressing tool in the embodiment of the present invention;

[0028] Figure 6 yes Figure 5 A schematic diagram of the three-dimensional structure of the gripper module;

[0029] Figure 7 yes Figure 5 The schematic diagram of the three-dimensional structure after the press base is omitted;

[0030] Figure 8 yes Figure 5 A schematic diagram of the structure of the soldering ribbon pressing tool at one viewing angle;

[0031] Fig. 9 yes Figure 8 Cross-section view of AA.

[0032] In the figure: 100, material receiving platform; 200, string transport platform; 201, loading end; 202, unloading end; 300, welding strip press; 301, clamping and positioning space; 31, press base; 32, moving seat; 321, force column; 33, clamping claw module; 331, first clamping claw; 332, second clamping claw; 333, connecting pin; 334, first elastic member; 335, clamping limit column; 35, driving connecting rod; 361, guide rod; 362, second elastic member; 37, anti- Guard block; 381, bottom plate; 382, ​​positioning groove; 400, battery cell feeding device; 401, preheating platform; 402, battery cell material box; 403, visual inspection and correction platform; 404, dicing platform; 405, battery cell conveyor belt; 406, battery cell loading platform; 407, battery cell handling mechanism; 500, solder strip preparation device; 600, flipping mechanism; 700, string cutting mechanism; 800, roller; 900, press transfer mechanism; 1000, film strip preparation device. DETAILED DESCRIPTION

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the thickness of regions and layers are exaggerated for clarity. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0034] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. 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 solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring various aspects of the present invention.

[0035] The following example describes a method for stringing photovoltaic cells in a string according to the present invention. This example is only a part of the embodiments of the present invention, but the protection scope of the present invention is not limited thereto. All other embodiments obtained by ordinary technicians in this field without creative work should be included in the protection scope of the present invention.

[0036] Please refer to Figures 1 to 9 According to an embodiment of the present invention, a method for stringing photovoltaic cells is provided, comprising the following steps:

[0037] The battery cell is carried to the material receiving platform 100 with the front side of the battery cell facing upward. The material receiving platform 100 is also a platform where the battery cell, welding rod and film strip are attached as one body.

[0038] Place the prepared welding strips of a preset number (the specific number matches the number of grid lines on the corresponding battery cell) and a preset length (generally greater than the sum of the lengths of two battery cells, and the extra length is mainly selected based on the thickness of the battery cell) on the front side of the battery cell, and make each welding strip correspond to the grid lines on the front side of the battery cell one by one, and reserve a connection section (not shown in the figure) protruding from the end of the battery cell for each welding strip;

[0039] The prepared film strip is attached to the front side of the battery cell to connect each of the welding strips to the front side of the battery cell. The aforementioned film strip is specifically prepared by a film strip preparation device 1000, and its length matches the length of each battery cell. The film strip preparation device 1000 can be a related film strip (segment) preparation device in the prior art.

[0040] The cell with the film strip and the soldering ribbon attached to the front is turned over and placed on the string transport platform 200 with the back facing upwards, and the connecting section of the soldering ribbon on the rear cell on the string transport platform 200 is placed on the back of the front cell (see Figure 3As shown) and the free end of the connecting section is placed in each clamping and positioning space 301 of the solder ribbon press 300, and the solder ribbon press 300 is placed on the string transport platform 200 to follow the string transport platform 200 and move synchronously with each battery cell on the string transport platform 200, so that each solder ribbon connecting section can be reliably positioned through each clamping and positioning space 301 of the solder ribbon press 300;

[0041] The prepared film strips are attached to the back side of the battery cell to connect each welding strip to the back side of the battery cell. The film strips on the back side of the battery cell can be prepared using the same film strip preparation device 1000 as the aforementioned film strips on the front side. In order to keep consistent with the process rhythm of the entire solution and improve operating efficiency, in a specific embodiment, the aforementioned film strip preparation device 1000 is configured in two groups to prepare film strips on the front and back sides of the battery cell respectively.

[0042] In this technical solution, by placing a solder ribbon press 300 on the string transport platform 200, the clamping and positioning spaces 301 of the solder ribbon press 300 can be used to form a reliable positioning for the free ends of each solder ribbon connecting segment on the back side of the previous battery cell. The solder ribbon press 300 can move synchronously with the movement of the string transport platform 200, effectively preventing the solder ribbon from shifting in position during the battery cell string transport process, resulting in poor subsequent adhesive film attachment effect, thereby improving the battery cell stringing effect.

[0043] In some embodiments, the string transport platform 200 has a direction in which the battery sheets are transported (see Figure 3 The feeding end 201 is provided with an electromagnetic force applying structure (not shown in the figure). When the electromagnetic force applying structure is energized, the solder strip presser 300 at the feeding end 201 realizes left and right clamping and positioning of the free ends of each solder strip in each clamping and positioning space 301. When the electromagnetic force applying structure is de-energized, the solder strip presser 300 at the feeding end 201 releases the clamping and positioning of the free ends of each solder strip in each clamping and positioning space 301. Before the next solar cell is placed on the string transport platform 200, the electromagnetic force applying structure is controlled to be in a de-energized state. When the next solar cell is placed on the string transport platform 200 and the free ends of the connecting sections of each solder strip are placed one by one in each clamping and positioning space 301, the electromagnetic force applying structure is controlled to be in a energized state. The aforementioned electromagnetic force applying structure is specifically, for example, an electromagnetic coil (also called an electromagnet), which generates electromagnetic force when powered on and loses the electromagnetic force when powered off.

[0044] In this technical solution, an electrically controllable electromagnetic force applying structure is provided at the loading end 201 of the string transport platform 200, so that the working state of the soldering strip press 300 can be switched by controlling the power gain and loss of the electromagnetic force applying structure. Before the next battery cell is placed on the string transport platform 200, the electromagnetic force applying structure is controlled to lose power, thereby placing the soldering strip press 300 in a non-clamping state. This helps the free end of the soldering strip connecting section on the next battery cell to be more smoothly aligned in the corresponding clamping positioning space 301.

[0045] In some embodiments, the string transport platform 200 further comprises a middle section (not marked in the figure) between the loading end 201 and the unloading end 202, and the left and right sides of the middle section (i.e. Figure 2 Permanent magnets (not shown in the figure) are respectively provided on the upper and lower sides of the orientation shown, and the permanent magnets can enable each clamping and positioning space 301 of each of the solder ribbon presses 300 corresponding to its position to form left and right clamping and positioning for each free end of the solder ribbon (that is, the free end of the solder ribbon connecting section). In this technical solution, the control of the solder ribbon press 300 is achieved by means of a permanent magnet arranged in the middle section of the string transport platform 200, which can simplify the structural design while reducing the production line design cost, ensure the reliable positioning of the free end of the solder ribbon connecting section by the solder ribbon press 3 during the transportation of the battery cell, and prevent the position of the solder ribbon from shifting during the transportation of the battery cell. It should be noted that the aforementioned electromagnetic force application structure and the position of the permanent magnet are relatively fixed, and they do not move with the conveying moving parts of the string transport platform 200.

[0046] It can be understood that after the solder ribbon press 300 clamps and positions the free ends of the solder ribbon connection segments, the prepared adhesive strip is attached to the back of the battery cell to thereby achieve attachment and positioning of the solder ribbon.

[0047] In another preferred embodiment, the unloading end 202 is a non-magnetic section, that is, at the unloading end 202 , the clamping claw module 33 releases the clamping of the free ends of each connecting section to ensure smooth removal of the solder ribbon press 300 .

[0048] Due to the setting of the solder ribbon press 300, the position corresponding to the free end of the film strip and the solder ribbon connecting section cannot be attached to the battery cell before the solder ribbon press 300 is removed. After the solder ribbon press 300 is removed, the end of the film strip will be warped to a certain extent and it is not easy to reliably attach to the back side of the battery cell. Based on this phenomenon, a roller 800 is provided at the unloading end 202. The roller 800 is used to apply pressure to the film strip on the back side of the battery cell at the unloading end 202, so that the film strip can be reliably attached to the back side of the battery cell.

[0049] The photovoltaic cell stringing method also includes the step of transferring the solder ribbon press 300 at the unloading end 202 to the loading end 201 through a press transfer mechanism 900. The press transfer mechanism 900 may include, for example, a conveyor belt structure, which is arranged in parallel on one side of the stringing transport platform 200, and its conveying direction is opposite to the conveying direction of the stringing transport platform 200. It has a corresponding transfer robot, which can be transferred between the stringing transport platform 200 and the conveyor belt structure, thereby forming a recycling use of the solder ribbon press 300 between the two conveying structures.

[0050] See also Figures 5 to 9 As shown, in some embodiments, the welding ribbon press 300 includes a press base 31, a movable base 32 and a plurality of clamping jaw modules 33, each of the clamping groups includes a first clamping jaw 331 and a second clamping jaw 332 that are arranged opposite to each other, the first clamping jaw 331 and the second clamping jaw 332 are pivotally connected to the press base 31 through a connecting pin 333, and the clamping positioning space 301 is formed between the lower ends of each of the first clamping jaw 331 and the second clamping jaw 332, and a first elastic member 334 (for example, a coil spring) is clamped between the upper ends of the first clamping jaw 331 and the second clamping jaw 332, and the upper and lower ends are specifically Figure 5 The shown orientation is for reference, the movable seat 32 has a low position generated by its own gravity and a high position generated by an external lifting force, when the movable seat 32 is in the low position, the clamping claw module 33 can release the clamping of the free end of the welding strip connecting section in each of the clamping and positioning spaces 301, when the movable seat 32 is in the high position, the clamping claw module 33 can clamp the free end of the welding connecting section in each of the clamping and positioning spaces 301 under the action of the first elastic member 334, and when the electromagnetic force applying structure is in the energized state, the movable seat 32 is in the high position, and when the electromagnetic force applying structure is in the de-energized state, the movable seat 32 is in the low position.

[0051] In this technical solution, by controlling the switching of the height position of the movable seat 32, the clamping action or the release action of each clamping claw module 33 can be realized, thereby realizing the clamping positioning or release of the welding strip. The structure is simple, and the control is only for the gain and loss of electricity of the electromagnetic force application structure, and the electrical control is also very simple.

[0052] See Figure 6As shown, in some embodiments, in the same clamping jaw module 33, a clamping limit column 335 is provided between the lower ends of the first clamping jaw 331 and the second clamping jaw 332, and the clamping limit column 335 is connected to the press base 31. By reasonably selecting the diameter of the clamping limit column 335, the mutual distance between the first clamping jaw 331 and the second clamping jaw 332 in the same clamping jaw module 33 during clamping can be adjusted to prevent damage to the welding strip due to too small a clamping distance and insufficient limiting positioning accuracy of the welding strip due to too large a clamping distance.

[0053] See also Figure 6 As shown, for the same clamping jaw module 33, the upper ends of the first clamping jaw 331 and the second clamping jaw 332 are inclined structures extending close to each other, and the moving seat 32 has force columns 321 on both sides of the upper ends of each clamping jaw module 33, and each of the force columns 321 is set in a one-to-one correspondence with each of the inclined structures, so that when the moving seat 32 switches from a high position to a low position under its own weight, the upper ends of the first clamping jaw 331 and the second clamping jaw 332 can be driven closer to each other more smoothly, thereby ensuring that the spacing of the aforementioned clamping and positioning space 301 is increased, which is conducive to the convenient removal of the welding strip press 300, and also facilitates the free end of the welding strip connecting section to be placed more smoothly in each clamping and positioning space 301;

[0054] See also Figure 7 and Fig. 9 As shown, the left and right ends of the press base 31 are respectively provided with a driving link 35, the driving link 35 is pivotally connected to the press base 31, and the first end of the driving link 35 is supported on the bottom side of the moving seat 32, and the second end of the driving link 35 can be attracted by the electromagnetic force applying structure or the permanent magnet to rotate downward around the pivot connection point between it and the press base 31, and the first end and the second end are respectively located on both sides of the pivot connection point, so that the driving link 35 objectively forms a lever structure, and the other end is reversely lifted while one end is forced down, so as to realize the electromagnetic force applying structure (or permanent magnet) to realize position switching of the moving seat 32 in a lifting manner, and the structure is simple and reliable. In a specific embodiment, the second end of the aforementioned driving link 35 has a magnetic material (such as iron) to ensure that the electromagnetic force applying structure can apply electromagnetic force to it, and the other parts of the driving link 35 can select non-magnetic materials with smaller mass, for example, it can be a plastic with higher strength. The aforementioned driving link 35 can be specifically an L-shaped link.

[0055] In some embodiments, a guide rod 361 is provided between the two ends of the movable seat 32 and the press base 31, and a second elastic member 362 (specifically, a coil spring) is sleeved on the outer periphery of the guide rod 361. The second elastic member 362 is clamped between the movable seat 32 and the press base 31 to ensure smooth position switching (lifting and lowering) of the movable seat 32.

[0056] In some embodiments, bottom plates 381 are respectively provided on the bottom surfaces of the left and right ends of the press base 31. By selecting bottom plates 381 of different thicknesses, it is possible to ensure that a gap is formed between the bottom surface of the press base 31 and the back surface of the battery cell, thereby preventing the solder ribbon press 300 from directly contacting the battery cell and reducing the probability of damaging the battery cell during the pressing process of the solder ribbon press 300. Corresponding positioning grooves 382 are also provided on the bottom surface of the aforementioned bottom plate 381 to cooperate with corresponding protruding structures on the left and right sides of the string transport platform 200 to ensure accurate positioning of the solder ribbon press 300.

[0057] In some embodiments, before the battery cells are transported to the receiving platform 100, a battery cell feeding device 400 is used to divide the whole battery cell into a preset number of pieces (generally one-to-two), and the battery cells are preheated on a preheating platform 401 before being transported to the receiving platform 100. Before the battery cells are transported to the receiving platform 100, the battery cells are first heated by the preheating platform 401 to increase the temperature of the battery cells, which is beneficial to the reliable attachment of the film strip to the front side of the battery cells. The aforementioned preheating platform 401 can be specifically provided with two groups located upstream and downstream respectively, so as to be able to perform gradient preheating on the battery cells and improve the feeding rhythm of the battery cells.

[0058] The flipping of the battery cell is performed by a flipping mechanism 600, which includes a first gripping platform (not shown and not labeled) and a second gripping platform (not shown and not labeled). The first gripping platform adsorbs the battery cell on the receiving platform 100 after the film strips are adhered, and then flips it 180°. The second gripping platform adsorbs the battery cell on the first gripping platform and places the battery cell on the string transport platform 200. The first gripping platform and the second gripping platform both have a solder strip positioning structure for positioning the connecting section, so as to clamp the connecting section of the solder strip to prevent the solder strip from shifting during the flipping process.

[0059] The material receiving platform 100 can be set in a group. In an embodiment not shown in the figure, the material receiving platform 100 has two groups or even more than two groups. The two groups of material receiving platforms 100 can be driven in the horizontal and vertical directions to alternately realize the reception of battery cells, welding strips and film strips. When the material receiving platform 100 receives the battery cells, the material receiving platform 100 is in the upper movement trajectory. After the welding strips and film strips are connected to the front of the battery cells, the material receiving platform 100 is transported along the upper movement trajectory toward the flipping mechanism 600. The flipping mechanism 600 grabs the battery cells on the material receiving platform 100, the battery cells are separated from the material receiving platform 100, and the material receiving platform 100 enters the lower movement trajectory. When the receiving platform 100 on the upper motion track moves toward the flip mechanism 600, the receiving platform 100 on the lower motion track moves upward and enters the upper motion track to receive the subsequent battery cells. By at least two receiving platforms 100 transporting battery cells alternately between the upper motion track and the lower motion track, transportation space is saved, and the transportation speed of battery cells is accelerated by alternating transportation. Both the receiving platform 100 and the string transportation platform 200 are provided with a negative pressure generating device, and adsorption holes are opened on the surfaces of the receiving platform 100 and the string transportation platform 200 to achieve adsorption transportation of battery cells.

[0060] In some embodiments, the preparation of the solder strip is performed by a solder strip preparation device 500, which includes two groups of solder strip clamps (not shown in the figure), and the two groups of solder strip clamps are respectively arranged in one-to-one correspondence with each group of the material receiving platforms 100, and the two groups of solder strip clamps can be driven in the horizontal and vertical directions to alternately clamp and pull the cut ends of the solder strip, thereby improving work efficiency.

[0061] Specifically, in a specific embodiment not shown in the figure, after the welding tape is fed, it is received by the first strap-pulling hand and the second strap-pulling hand. The first strap-pulling hand presses and holds the welding tape and remains stationary, while the second strap-pulling hand presses and holds the welding tape and moves away from the first strap-pulling hand, thereby tightening the welding tape. On the side of the second strap-pulling hand away from the first strap-pulling hand, there are a welding tape cutting mechanism, a clamping platform and a welding tape clamp. The welding tape cutting mechanism is located between the welding tape clamp and the second strap-pulling hand. The welding tape clamp is used to pull the welding tape that has passed through the pressing hand to a desired distance. When the clamp clamps the solder strip, the solder strip cutting mechanism moves back a distance to leak out a part of the solder strip, which is convenient for the solder strip clamp to clamp. The clamping platform is located between the solder strip clamp and the solder strip cutting mechanism. After the solder strip clamp pulls the solder strip out the required distance, it moves upward, thereby clamping the solder strip between the solder strip clamp and the solder strip cutting mechanism. The solder strip cutting mechanism cuts the solder strip stretched by the second pulling hand. After the battery cell is placed on the material connection platform, the solder strip clamp clamps the solder strip to the battery cell on the material connection platform, and then the clamping platform moves down and resets. After the film coating of the solder strip on the front of the battery cell is completed, the solder strip clamp releases the solder strip, moves upward, and then returns to its original position to clamp the subsequent solder strip.

[0062] In some embodiments, the solder strip preparation device 500 includes a solder strip cutting mechanism, and a clamping platform is provided at the output end of the solder strip cutting mechanism for supporting the cut end of the solder strip of a preset length formed by cutting, without supporting the entire length of the solder strip (segment) formed by cutting, thereby preventing the solder strip from bending and hindering its movement due to the falling of the solder strip when the solder strip clamp transfers the solder strip.

[0063] In some embodiments, a string cutting mechanism 700 is further provided on the downstream side of the string transport platform 200 for cutting the stringed battery strings into battery strings of target lengths, thereby forming a plurality of battery strings of target lengths.

[0064] The string transport platform 200 is also provided with a heating mechanism capable of heating the battery cells to improve the reliability of the film strips attached to the back of the battery cells. In other embodiments, after the film strips on the back of the battery cells are attached, a cooling mechanism is provided to cool the battery cells, so that the film strips adhered to the battery cells are more firmly attached, and the probability of the film strips loosening during subsequent transportation is reduced. At this time, the cooling mechanism should be provided on the upstream side of the aforementioned string cutting mechanism 700, for example, it can be provided at the unloading end 202 of the string transport platform 200.

[0065] In the embodiment of the present invention, the battery cell is fed as a whole piece. Before the battery cell is transported to the receiving platform 100, the whole battery cell needs to be aligned, and visual identification is performed during alignment. The aligned battery cell is transported by forklift, and the forklift crosses two stations. The forklift passes through the alignment station, the station to be diced, and the station to be transported. The forklift process is to transport the battery cell aligned at the alignment station to the station to be diced, and simultaneously transport the battery cell at the station to be diced to the station to be transported and complete the dicing function during the forklift process, so that the whole battery cell is formed into two half-cell battery cells, and then the half-cell battery cells are transported. The cells are transported to the cell conveyor belt, and then transported to the receiving platform by the cell conveyor belt. The laser scribing process is used for slicing. When the cell that has been sliced ​​on the waiting station is transported to the cell conveyor belt, the cell is deflected 180 degrees during the transportation process. Before the cell is transported to the feeding station, a drying mechanism for drying the water vapor on the surface of the cell, a secondary straightening mechanism for straightening the cell, a defective screening mechanism for grabbing and eliminating defective cells visually identified during the straightening process by a manipulator, and an information collection mechanism for collecting information on the cell are provided. That is, the battery cell feeding device 400 in the present invention includes a battery cell material box 402, a visual inspection and correction platform 403, a dicing platform 404, a battery cell conveyor belt 405 and a battery cell loading platform 406 which are arranged in sequence along the battery cell loading path. The battery cells are transported by a battery cell transport mechanism 407, and the aforementioned battery cell transport mechanism 407 is, for example, the aforementioned fork carrier. Correspondingly, a fork transport groove for the fork carrier to move is opened on the material receiving platform 100.

[0066] As mentioned above, the membrane strip preparation device 1000 is used to pull and prepare the membrane strips required for the battery string. Specifically, in an embodiment not shown in the figure, after the membrane strip is fed, it is stretched by several rollers and then cut to form several required membrane strips from the whole membrane strip. After that, it passes through the spacing and enters the membrane strip drawing mechanism. The drawing mechanism consists of a partition, a molding platform and a drawing gripper. The membrane strip after spacing enters the partition, and the partition uses physical means to separate adjacent membrane strips, which reduces the probability of membrane strip adhesion. The drawing gripper pulls the membrane strip out of the partition and lays it on the molding platform. The partition is connected to a cutting knife. After the membrane strip is laid on the molding platform, the cutting knife cuts the membrane strip to form the required membrane strip. The required membrane strip is transported to the material receiving platform by the membrane strip transporter and welded to the front of the battery cell on the material receiving platform. The belt is used for laminating; the film strip needs to be corrected during the feeding process, the stretching part of the film strip is located on the first correcting platform, the spacing part of the film strip is located on the second correcting platform, a first photoelectric sensor is provided between the first correcting platform and the second correcting platform, a second photoelectric sensor is provided between the second correcting platform and the belt drawing mechanism, the first photoelectric sensor is used to detect the state of the film strip between the first correcting platform and the second correcting platform, the second photoelectric sensor is used to detect the state of the film strip between the second correcting platform and the belt drawing mechanism, the first correcting platform can adjust its position according to the signal of the first photoelectric sensor to realize the correction of the film strip, and the second correcting platform can adjust its position according to the signal of the second photoelectric sensor to realize the correction of the film strip.

[0067] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for stringing photovoltaic cells, characterized in that: The steps include: Carrying the battery sheet onto a receiving platform (100) with the front side of the battery sheet facing upwards; Placing a preset number of prepared welding strips with a preset length on the front side of the battery cell, making each welding strip correspond to the grid line on the front side of the battery cell one by one, and leaving a connection section of each welding strip protruding from the end of the battery cell; Attaching the prepared film strip to the front side of the battery cell to connect each of the welding strips to the front side of the battery cell; Turning over the battery cell with the film strip and the welding strip attached to the front side and placing it on the string transport platform (200) with the back side facing upwards, placing the connecting section of the welding strip on the rear battery cell on the string transport platform (200) on the back side of the front battery cell and placing the free end of the connecting section in the respective clamping and positioning spaces (301) of the welding strip press (300), the welding strip press (300) being placed on the string transport platform (200) to follow the string transport platform (200) and move synchronously with the battery cells on the string transport platform (200); The prepared film strip is attached to the back side of the battery cell to connect each of the welding strips to the back side of the battery cell.

2. The photovoltaic cell stringing method according to claim 1, characterized in that: The string transport platform (200) has a loading end (201) located on the upstream side of the battery cell conveying direction and a unloading end (202) located on the downstream side of the battery cell conveying direction. The loading end (201) has an electromagnetic force applying structure. When the electromagnetic force applying structure is energized, the solder strip presser (300) located at the loading end (201) realizes left and right clamping and positioning of the free ends of each solder strip in each clamping and positioning space (301). When the electromagnetic force applying structure is de-energized, the solder strip presser (300) located at the loading end (201) realizes left and right clamping and positioning of the free ends of each solder strip in each clamping and positioning space (301). The solder strip press (300) at the feeding end (201) releases the clamping and positioning of the free ends of each solder strip in each clamping and positioning space (301), and before the next battery cell is placed on the string transport platform (200), the electromagnetic force applying structure is controlled to be in a de-energized state; when the next battery cell is placed on the string transport platform (200) and the free ends of the connecting sections of each solder strip are placed one by one in each clamping and positioning space (301), the electromagnetic force applying structure is controlled to be in a energized state.

3. The photovoltaic cell stringing method according to claim 2, characterized in that: The string transport platform (200) also has a middle section between the loading end (201) and the unloading end (202), and permanent magnets are respectively provided on the left and right sides of the middle section, and the permanent magnets can enable each clamping and positioning space (301) of each solder strip press (300) corresponding to its position to form left and right clamping and positioning for the free end of each solder strip; and / or, a roller (800) is provided at the unloading end (202), and the roller (800) is used to apply pressure to the film strip on the back side of the battery cell at the unloading end (202); and / or, the photovoltaic cell stringing method also includes the step of transferring the solder strip press (300) at the unloading end (202) to the loading end (201) by a press transfer mechanism (900).

4. The photovoltaic cell stringing method according to claim 2 or 3, characterized in that: The welding strip press (300) comprises a press base (31), a movable seat (32) and a plurality of clamping jaw modules (33), each of the clamping groups comprises a first clamping jaw (331) and a second clamping jaw (332) which are arranged opposite to each other, the first clamping jaw (331) and the second clamping jaw (332) are pivotally connected to the press base (31) via a connecting pin (333), the clamping positioning space (301) is formed between the lower ends of each of the first clamping jaw (331) and the second clamping jaw (332), a first elastic member (334) is clamped between the upper ends of the first clamping jaw (331) and the second clamping jaw (332), the movable seat (32) has a low position generated by its own gravity and a The high position is generated under the action of the external lifting force. When the movable seat (32) is in the low position, the clamping claw module (33) can release the clamping of the free end of the welding strip connecting section in each clamping positioning space (301). When the movable seat (32) is in the high position, the clamping claw module (33) can clamp the free end of the welding connecting section in each clamping positioning space (301) under the action of the first elastic member (334). When the electromagnetic force applying structure is in the energized state, the movable seat (32) is in the high position. When the electromagnetic force applying structure is in the de-energized state, the movable seat (32) is in the low position.

5. The photovoltaic cell stringing method according to claim 4, characterized in that: In the same clamping jaw module (33), a clamping limit column (335) is provided between the lower ends of the first clamping jaw (331) and the second clamping jaw (332), and the clamping limit column (335) is connected to the press base (31); and / or, for the same clamping jaw module (33), the upper ends of the first clamping jaw (331) and the second clamping jaw (332) are inclined structures extending close to each other, and the movable seat (32) has force columns (321) located on both sides of the upper ends of each clamping jaw module (33), and each force column (321) is arranged in a one-to-one corresponding manner to each inclined structure; or, A driving link (35) is respectively provided at the left and right ends of the press base (31), and the driving link (35) is pivotally connected to the press base (31), and the first end of the driving link (35) is supported on the bottom side of the movable seat (32), and the second end of the driving link (35) can be attracted by the electromagnetic force applying structure or the permanent magnet to rotate downward around the pivot connection point between it and the press base (31), and the first end and the second end are respectively located on both sides of the pivot connection point.

6. The photovoltaic cell stringing method according to claim 5, characterized in that: A guide rod (361) is provided between the two ends of the movable seat (32) and the press base (31), and a second elastic member (362) is sleeved on the outer periphery of the guide rod (361). The second elastic member (362) is clamped between the movable seat (32) and the press base (31).

7. The photovoltaic cell stringing method according to claim 1, characterized in that: Before the battery cells are transported to the receiving platform (100), a battery cell feeding device (400) is used to divide the entire battery cell into a preset number of cells, and the battery cells are preheated on a preheating platform (401) before being transported to the receiving platform (100); and / or, the receiving platform (100) has two groups, and the two groups of receiving platforms (100) can be driven in the horizontal and vertical directions to alternately receive the battery cells, welding strips and film strips.

8. The photovoltaic cell stringing method according to claim 7, characterized in that: The preparation of the solder strip is performed by a solder strip preparation device (500), and the solder strip preparation device (500) comprises two groups of solder strip clamps, and the two groups of solder strip clamps are respectively arranged in a one-to-one correspondence with each group of the material receiving platforms (100), and the two groups of solder strip clamps can be driven in the horizontal and vertical directions to alternately clamp and pull the cut ends of the solder strip; and / or, the flipping of the battery cell is performed by a flipping mechanism (600), and the flipping mechanism (600) comprises a first gripping platform and a second gripping platform, and the first gripping platform and the second gripping platform both have solder strip positioning structures for positioning the connecting section.

9. The photovoltaic cell stringing method according to claim 8, characterized in that: The welding strip preparation device (500) comprises a welding strip cutting mechanism, and a clamping platform is provided at the output end of the welding strip cutting mechanism for supporting the cut end of the welding strip having a preset length formed by cutting.

10. The photovoltaic cell stringing method according to claim 1, characterized in that: A string cutting mechanism (700) is also provided on the downstream side of the string transport platform (200) for cutting the stringed battery strings into battery strings of target lengths; and / or a heating mechanism capable of heating the battery cells is also provided on the string transport platform (200).

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