BC type battery string forming method and device

Abstract

The invention provides a BC type battery string forming method and device, and the method comprises the steps: enabling all battery pieces to be sequentially arranged on a battery piece string forming platform in the length direction of the battery piece string forming platform, and enabling the back surfaces of all the battery pieces to face upwards; the welding strip sections and the adhesive film sections which are prepared through cutting are sequentially placed at target positions on the back faces of the battery pieces so that the adjacent battery pieces can be connected into a battery string, and the welding strip sections and the adhesive film sections are prepared through cutting by adopting a strip film cutting section making unit; a welding strip section and an adhesive film section which are cut and prepared by the strip film cutting and segmenting unit are respectively placed on a welding strip bearing table and an adhesive film bearing table which are arranged on the strip film cutting and segmenting unit, and when the welding strip section and the adhesive film section are placed, the battery piece bunching platform is controlled to be positioned in an area close to the strip film cutting and segmenting unit. According to the invention, after the plurality of battery pieces are arranged in the string-forming state, the welding strip section and the adhesive film section are uniformly placed, so that the string-forming process flow is simplified, the string-forming preparation efficiency is higher, and the capacity of the battery string is improved.

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 BC type battery strings. Background Art

[0002] In the field of photovoltaic module preparation, a battery string is composed of a plurality of battery wafers connected by solder tapes. In a BC type battery string, the solder tapes are only distributed on one side of the battery wafers to realize the conduction of current between adjacent battery wafers.

[0003] The BC type battery stringing (also known as BC battery string) has the characteristic of no grid lines on the front side, thus eliminating the light energy loss caused by the grid lines on the front side of the traditional battery string, maximizing the utilization of the energy of incident photons, and improving the light energy conversion efficiency.

[0004] In the existing film sticking and stringing equipment, usually, a manipulator is used to grasp and place the battery wafers and solder tapes one by one on a table and fix them, and then the adhesive film on the surface of the battery wafers is heated and cured to realize the bonding of the solder tapes on the surface of the battery wafers. However, the stringing preparation efficiency of this processing and manufacturing method is relatively slow, and the production capacity of the production equipment for producing battery strings is low, and the yield of the produced battery strings is low. Summary of the Invention

[0005] The method and device for stringing BC type battery strings designed by the present invention can overcome the deficiencies of the existing method for stringing BC type battery wafers, which uses a manipulator to grasp and place the battery wafers and solder tapes one by one on a battery stringing platform to realize the curing connection of the solder tapes, with slow stringing preparation efficiency, low production capacity, and low yield of battery strings.

[0006] The purpose of the present invention is to provide a method for stringing BC type battery strings, including the following steps:

[0007] Arrange the battery wafers on the battery stringing platform in sequence along the length direction of the battery stringing platform, and make the back sides of the battery wafers face upward;

[0008] Place the cut solder tape segments and adhesive film segments at the target positions on the back sides of the battery wafers in sequence to connect the adjacent battery wafers into a battery string. The solder tape segments and adhesive film segments are cut and prepared by a film - with - cutting and segment - making unit. The cut solder tape segments and adhesive film segments prepared by the film - with - cutting and segment - making unit are respectively placed on the solder tape bearing platform and the adhesive film bearing platform of the film - with - cutting and segment - making unit. Before placing the solder tape segments and adhesive film segments, control the battery stringing platform to translate into the area close to the film - with - cutting and segment - making unit.

[0009] In some embodiments, placing the solder ribbon segment and the adhesive film segment is performed by a film-carrying handling mechanism, which can be controlled to hold the solder ribbon segment after adsorbing the adhesive film segment, so as to form a hierarchical layout with the adhesive film segment on top and the solder ribbon segment at the bottom.

[0010] In some embodiments, the cell stringing platform has a plurality of them and can all be driven to move cyclically and alternately in a straight line direction. At least two sets of film-carrying cutting and segmenting units are configured. Each of the film-carrying cutting and segmenting units is arranged at intervals along the straight line moving direction of the cell stringing platform. Each of the cell stringing platforms is controlled to intermittently stay upstream and downstream of each film-carrying cutting and segmenting unit with respect to the straight line moving direction along the straight line moving direction, and when the cell stringing platform intermittently stays, place the cut and prepared solder ribbon segment and adhesive film segment in the film-carrying cutting and segmenting unit closest to it at the target position on the back of the cell.

[0011] In some embodiments, a passage space for the cell stringing platform to pass through is formed in the lower areas of each solder ribbon carrier and each adhesive film carrier in each film-carrying cutting and segmenting unit, and the cell stringing platform reciprocates through the passage space along the straight line moving direction.

[0012] In some embodiments, there are two sets of film-carrying cutting and segmenting units. In each film-carrying cutting and segmenting unit, a solder ribbon cutting assembly including the solder ribbon carrier and an adhesive film cutting assembly including the adhesive film carrier are respectively arranged. One of the two sets of film-carrying cutting and segmenting units is used to cut the solder ribbon segment as the positive electrode and the adhesive film segment corresponding to its length, and the other set is used to cut the solder ribbon segment as the negative electrode and the adhesive film segment corresponding to its length. In one adhesive film cutting assembly, each solder ribbon segment on the solder ribbon carrier and each adhesive film segment on the adhesive film carrier are placed at intervals along the length direction of the cell on the back of the cell.

[0013] In some embodiments, before the film-carrying handling mechanism holds the solder ribbon segment, the two ends of the solder ribbon segment to be held are controlled to lift upward; and / or, the length direction of the cell stringing platform is parallel to the length direction of the solder ribbon segment on the solder ribbon carrier and the length direction of the adhesive film segment on the adhesive film carrier.

[0014] In some embodiments, before arranging each cell in sequence along the length direction of the cell stringing platform, it further includes a cell pre-arrangement step:

[0015] The battery cells in the battery cell loading unit are sequentially laid flat on the pre-arrangement platform, so that a positive spacing is formed between adjacent battery cells; or, the battery cells in the battery cell loading unit are sequentially laid flat on the pre-arrangement platform, so that a negative spacing is formed between adjacent battery cells, and the pre-arranged battery cells are integrally transported to the battery cell stringing platform.

[0016] In some embodiments, after the cut solder tape segments and adhesive film segments are sequentially placed on the back of each battery cell, the back of each battery cell is further repressed.

[0017] In some embodiments, when a positive spacing is formed between the pre-arranged battery cells, after the pre-arranged battery cells are integrally transported to the battery cell stringing platform, a light-shielding strip is attached to the positive spacing region between two adjacent battery cells.

[0018] The present invention also provides a stringing device for implementing the above BC-class battery cell stringing method, including: a battery cell loading unit, a battery cell stringing platform, a tape and film cutting and preparation unit, and a tape and film handling mechanism. Among them, the battery cell stringing platform can be driven to translate in a linear direction parallel to the width direction of the battery cells arranged thereon, and the battery cell loading unit is located on the upstream side of the linear direction, and the tape and film cutting and preparation unit is located on the downstream side of the linear direction. The battery cells in the battery cell loading unit can be arranged along the length direction of the battery cell stringing platform. The tape and film cutting and preparation unit is used to prepare solder tape segments and adhesive film segments and place the prepared solder tape segments and adhesive film segments on the solder tape carrier table and adhesive film carrier table it has. The tape and film handling mechanism is used to place the solder tape segments and adhesive film segments in the tape and film cutting and preparation unit on the back of the corresponding battery cells when the battery cell stringing platform is at the station corresponding to the tape and film cutting and preparation unit.

[0019] The BC-class battery cell stringing method and device of the present invention first arrange a plurality of battery cells (preferably the same number of battery cells as in the final battery string) along the length direction of the battery cell stringing platform, and then place the cut solder tape segments and adhesive film segments on the target positions of each battery cell from top to bottom respectively, thereby realizing reliable and fast connection and positioning of the solder tape segments on the back of the battery cells. Compared with the traditional method of taking and placing battery cells one by one and fixing and connecting the solder tape segments one by one, in the present application, the stringing method of placing the solder tape segments and adhesive film segments uniformly after arranging a plurality of battery cells in a stringed state simplifies the process flow and has higher stringing preparation efficiency, which is beneficial to improving the production capacity of the battery string. At the same time, since the battery cells are uniformly arranged and the solder tape segments and adhesive film segments are pasted with the battery cells in segments, it is convenient to accurately fit the solder tape segments with the grid lines on each battery cell, which can ensure the consistency of the positions of each battery cell and improve the yield of battery cell stringing. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the steps of the method for stringing BC-class battery strings in an embodiment of the present invention;

[0021] Figure 2 is a schematic layout diagram (simplified) of the device for stringing BC-class battery strings in an embodiment of the present invention, showing the dynamic process in which a battery cell stringing platform is driven to linearly translate from left to right and pass through various different workstations in sequence;

[0022] Figure 3 is Figure 2 a partial structural diagram (simplified diagram) of the gripper of the film-carrying handling mechanism in;

[0023] Figure 4 is Figure 2 a structural diagram (simplified diagram) of the solder tape carrier table in a top-down view in;

[0024] Figure 5 is a schematic diagram of the state change of the solder tape segments (positive electrode (red) and negative electrode (blue)) being successively placed on the back of each battery cell (adjacent green and light blue respectively represent two adjacent battery cells) on the same battery cell stringing platform in an embodiment of the present invention. From top to bottom, it shows the states before the battery cell stringing platform linearly translates to the first positive electrode solder tape pasting station, after translating to the first positive electrode solder tape pasting station and placing the solder tape segments (multiple spaced positive electrode solder tape segments), after translating to the second positive electrode solder tape pasting station and placing the solder tape segments (multiple spaced positive electrode solder tape segments), after translating to the first negative electrode solder tape pasting station and placing the solder tape segments (multiple spaced negative electrode solder tape segments), and after translating to the second negative electrode solder tape pasting station and placing the solder tape segments (multiple spaced negative electrode solder tape segments).

[0025] In the figure: 1. Battery cell stringing platform; 21. Solder tape carrier table; 211. Lifting top block; 212. Cutting knife; 22. Glue film carrier table; 23. Film-carrying handling mechanism; 230. Gripper; 2301. Solder tape clamping jaw; 2302. Glue film adsorption plate; 2303. Lifting motor; 2304. Gripper main body; 231. First film-carrying gripper; 232. Second film-carrying gripper; 233. Third film-carrying gripper; 234. Fourth film-carrying gripper; 31. Battery cell handling mechanism; 32. Laser scribing mechanism; 33. Battery cell rotating mechanism; 34. Visual recognition mechanism; 4. Battery cell pre-arrangement platform; 5. Light-shielding strip preparation unit; 51. Light-shielding strip handling mechanism; 100. Battery cell pre-arrangement station; 200. Light-shielding strip attachment station; 301. First positive electrode solder tape pasting station; 302. Second positive electrode solder tape pasting station; 401. First negative electrode solder tape pasting station; 402. Second negative electrode solder tape pasting station; 500. Film-carrying re-pressing station; 600. Battery string removal station. Detailed implementation manners

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various 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 concept of the example embodiments to those skilled in the art. In the figures, the thicknesses of regions and layers are exaggerated for clarity. Like reference numerals in the figures denote like or similar structures and thus their detailed description will be omitted.

[0027] The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present invention. However, those skilled in the art will realize that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, materials, etc. may be used. In other cases, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the present invention.

[0028] The following-described embodiments are the method and device for stringing BC-class battery strings of 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 those of ordinary skill in the art without creative efforts shall be covered by the protection scope of the present invention.

[0029] Please refer to Figures 1 to 5 , according to an embodiment of the present invention, a method for stringing BC-class battery strings is provided, including the following steps:

[0030] Arrange each battery cell (not shown and not indexed in the figure) along the length direction of the battery cell stringing platform 1 (i.e., Figure 2 the up-and-down direction of the orientation shown, i.e., the stringing direction of the battery string) on the battery cell stringing platform 1 in sequence, and make the back sides of the battery cells face upward. For BC-class battery cells, the aforementioned back side is the side of the battery cell with grid lines, and correspondingly, the side of the battery cell without grid lines and opposite to the aforementioned back side is the front side of the battery cell. In the usage state of the battery cell, the front side of the battery cell is placed upward to be exposed to light. It should be noted that, in a preferred embodiment, the number of battery cells on the battery cell stringing platform 1 should be the same as the number of battery cells in the finally strung battery string, which can further improve the stringing efficiency of the battery string;

[0031] The cut and prepared solder ribbon segments (not shown and not indexed in the figure) and the adhesive film segments (not shown and not indexed in the figure, and the bonding surface thereof should face the back side of the cell) are sequentially placed at the target positions on the back of each of the cells so that each adjacent pair of the cells are connected into a cell string. The aforementioned target position is also the position where the grid lines respectively possessed by two adjacent cells can form an electrical connection through the solder ribbon. During the actual processing, the aforementioned solder ribbon segments have multiple ones arranged at intervals along the width of the cell (relative to the length of the cell, taking the Figure 2 shown orientation as a reference, the length of the cell is the size of the cell from top to bottom, and the width of the cell is the size of the cell from left to right). Generally speaking, two adjacent solder ribbon segments (that is, adjacent positive solder ribbon segments and negative solder ribbon segments) form an alternating interval in the width direction of the cell (that is, the positive solder ribbon segments and the negative solder ribbon segments are alternately adjacent in the width direction of the cell to form an alternating arrangement of positive-negative-positive-negative intervals), and in the length direction of the cell, they are alternately arranged up and down with a difference of the length of one cell (that is, assuming that the positive solder ribbon segment in two adjacent solder ribbon segments is used to connect the first cell and the second cell, the negative solder ribbon segment will connect the second cell and the third cell). At the same time, it can be understood that the length of the aforementioned solder ribbon segment is generally the sum of the lengths of two adjacent cells, so as to realize the electrical series connection between two adjacent cells by one solder ribbon segment. Of course, for the first and last cells of the cell string, the length of some solder ribbon segments can be the length of a single cell (see the two segments at the left end and the right end of the solder ribbon segment shown in red in Figure 5 ) to meet the requirement that the solder ribbon segments (positive solder ribbon segments and negative solder ribbon segments) cross and connect adjacent two cells in the length direction of the cell.

[0032] In this technical solution, first, a plurality of cells (preferably the same number of cells as in the final cell string) are sequentially arranged along the length direction of the cell string platform 1, and then each of the cut and prepared solder ribbon segments and adhesive film segments are placed on the target positions of each cell from top to bottom, thereby realizing the reliable and fast connection and positioning of the solder ribbon segments on the back of the cell. Compared with the traditional method of picking and placing cells one by one and fixedly connecting the solder ribbon segments one by one correspondingly, the process flow of the method of uniformly placing the solder ribbon segments and the adhesive film segments after arranging a plurality of cells in a string state in this application is simplified, and the string preparation efficiency is higher. This can be beneficial to improving the production capacity of the cell string. At the same time, because the cells are uniformly arranged and the solder ribbon segments and the adhesive film segments are pasted to the cells in segments, it is convenient to accurately fit the solder ribbon segments with the grid lines on each cell, which can ensure the consistency of the positions of each cell and improve the yield rate of the cell string.

[0033] In a specific embodiment, the number of solar cells arranged once on the solar cell stringing platform 1 corresponds to the number of solar cells in the finally prepared solar cell string. At this time, a corresponding handling device (such as the film-carrying handling mechanism 23 described later) can be used to place each solder ribbon segment and each encapsulant film segment once or multiple times (multiple segments are carried each time) at the target positions on the back of the solar cells, thereby further improving the stringing efficiency of the solar cell string and enhancing the production capacity.

[0034] It should be noted that when the number of solar cells in the solar cell string is small, the method of carrying each solder ribbon segment and each encapsulant film segment once can be adopted. At this time, the corresponding length of the handling device will not be too long. When the number of solar cells in the solar cell string is large, it is preferably to adopt the method of carrying each solder ribbon segment and each encapsulant film segment multiple times to prevent the length of the handling device from being too large and reducing the design difficulty of the handling device.

[0035] In some embodiments, the solder ribbon segments and the encapsulant film segments are cut and prepared by a film-carrying cutting and segmenting unit (not labeled in the figure). The solder ribbon segments and the encapsulant film segments cut and prepared by the film-carrying cutting and segmenting unit are respectively placed on the solder ribbon bearing platform 21 and the encapsulant film bearing platform 22 of the film-carrying cutting and segmenting unit. Specifically, the aforementioned film-carrying cutting and segmenting unit can adopt an existing tape pulling mechanism and a corresponding cutting device to cut the solder ribbon or the encapsulant film into segments. For example, Figure 4 In an embodiment shown, a plurality of cutting knives 212 are arranged at intervals along the length direction of the solder ribbon bearing platform 21. The distance between two adjacent cutting knives 212 corresponds to the length of each solder ribbon segment. In this way, it is possible to synchronously cut and prepare the target number of solder ribbon segments (the number is generally one less than the number of solar cells in the solar cell string) on the solder ribbon bearing platform 21. Similarly, the cutting and preparation of the encapsulant film segments are similar to the preparation of the aforementioned solder ribbon segments and will not be elaborated. When placing the solder ribbon segments and the encapsulant film segments, the solar cell stringing platform 1 is controlled to be located (specifically, for example, driven to translate) in the area close to the film-carrying cutting and segmenting unit. That is, when placing the solder ribbon segments and the encapsulant film segments on the back of the arranged solar cells, the solar cell stringing platform 1 with the placed solar cells is translated to a position close to the film-carrying cutting and segmenting unit. In this way, the corresponding handling device can be used to transfer and place each cut solder ribbon segment and encapsulant film segment from the film-carrying cutting and segmenting unit onto the adjacent solar cell stringing platform 1, further improving the stringing operation efficiency.

[0036] Continue to refer to Figure 4As shown, in a preferred embodiment, the aforementioned welding tape carrier 21 is also provided with a plurality of groups of welding tape end lifting components (not shown in the figure and not labeled), each of the welding tape end lifting components includes two adjacently arranged lifting top blocks 211 and a lifting drive assembly (not shown in the figure and not labeled) capable of controlling each lifting top block 211 to rise to a certain height, and the cutting knife 212 is arranged between the two lifting top blocks 211. Thus, after the welding tape is cut into segments by the cutting knife 212, the two lifting top blocks 211 are controlled to rise to a certain height so that the ends of the welding tape segments on the top surfaces of the two lifting top blocks 211 are lifted and tilted, thereby facilitating the handling device to carry the welding tape segments to a great extent and ensuring the reliable stability of the handling device to carry the welding tape segments. Thus, before the film conveying mechanism 23 clamps the welding tape segments, the two ends of the welding tape segments to be clamped are controlled to be lifted upward.

[0037] In some embodiments, the placement of the solder tape segment and the adhesive film segment is performed by a film conveying mechanism 23, that is, the aforementioned conveying device is specifically implemented by a film conveying mechanism 23, and the film conveying mechanism 23 can be controlled to clamp the solder tape segment after absorbing the adhesive film segment to form a hierarchical layout with the adhesive film segment on top and the solder tape segment on the bottom. The film conveying mechanism 23 specifically includes a conveying hand 230 and a mechanical arm (not shown in the figure) for adjusting the position of the conveying hand 230, see Figure 3As shown, the handler 230 includes a handler body 2304. The top of the handler body 2304 is drivingly connected to the aforementioned robotic arm. In this way, when the robotic arm operates, it can drive the aforementioned handler body 2304 to move between the solder tape carrier 21, the adhesive film carrier 22, and the cell stringing platform 1 translated nearby. At the bottom of the aforementioned handler body 2304, there are correspondingly provided solder tape grippers 2301 for reliably clamping both ends of a solder tape segment. The clamping of the solder tape grippers 2301 is achieved by a corresponding drive motor (not shown in the figure). At the bottom of the handler body 2304, there is also provided an adhesive film suction plate 2302, which is located within the area between the two jaws of the solder tape grippers 2301 and can be lifted and lowered under the drive of a lifting motor 2303 to adjust the relative positions of the adhesive film suction plate 2302, the adhesive film carrier 22, and the cell. The aforementioned adhesive film suction plate 2302 uses vacuum negative pressure suction, and it is specifically in controllable communication with a corresponding negative pressure source. Vacuum negative pressure suction is a conventional technical means in the art and will not be elaborated here. In another preferred embodiment, a corresponding avoidance mechanism (not shown and not indexed in the figure) is provided at the solder tape grippers 2301. It prevents the collision interference between the adhesive film suction plate 2302 and the solder tape grippers 2301 during the process of picking and placing the adhesive film segment by monitoring the state of the adhesive film suction plate 2302. The aforementioned avoidance mechanism may include, for example, a telescopic assembly (such as a linear motor) capable of controlling the two jaws of the solder tape grippers 2301 to move towards or away from each other and an inductive switch for monitoring the real-time position of the adhesive film suction plate 2302. In this way, the distance between the jaws can be controlled to be within a reasonable size during the lifting and lowering process of the adhesive film suction plate 2302 to ensure that the adhesive film suction plate 2302 can pass smoothly between the two jaws. It should be noted that Figure 3 only the structure of the handler 230 corresponding to one solder tape segment and one adhesive film segment is shown. For the working condition of simultaneously handling multiple segments, multiple groups of the aforementioned structures can be arranged in parallel, and multiple groups of the handlers 230 are arranged at intervals along the length direction of the solder tape or the adhesive film.

[0038] In this technical solution, it is possible to simultaneously handle the solder tape segment and the adhesive film segment. Specifically, during application, the adhesive film segment is adsorbed first and then the solder tape segment is clamped, so that the adhesive film segment is located above the solder tape segment. When placing the solder tape segment and the adhesive film segment, their relative positions are more reliable and accurate, and the operation efficiency is higher.

[0039] In some embodiments, the cell stringing platform 1 has multiple ones and can all be driven in a linear direction (i.e., Figure 2...alternately move in a cycle in the left-right direction (in the orientation shown), and at least two sets of tape film cutting and segment making units are configured. Each of the tape film cutting and segment making units is arranged at intervals along the linear movement direction of the cell stringing platform 1. Each of the cell stringing platforms 1 is controlled to intermittently stay upstream (i.e., Figure 2 ...on the left side of the orientation shown) and downstream (i.e., Figure 2 ...on the right side of the orientation shown) of each tape film cutting and segment making unit with respect to the linear movement direction. When the cell stringing platform 1 intermittently stays, the solder tape segments and adhesive film segments prepared by cutting in the tape film cutting and segment making unit closest to it are placed at the target positions on the back of the cell. The aforementioned cyclic alternating movement is, for example, that multiple cell stringing platforms 1 move in a rectangular trajectory (or called an O-shaped trajectory) in a vertical plane, that is, each cell stringing platform 1 moves along Figure 2 ...the linear direction from left to right in the orientation shown through each work station in turn (see the following description), and after reaching the rightmost work station, it descends a certain height, that is, it moves linearly downward by a certain height and then moves linearly in the reverse direction, that is, from right to left, back to the leftmost work station and then rises to the original height, thus forming a cyclic alternating closed loop, and each cell stringing platform 1 corresponds to a work station respectively. Of course, each cell stringing platform 1 cannot correspond to the same work station at the same time.

[0040] In this technical solution, multiple cell stringing platforms 1 and tape film cutting and segment making units are respectively configured, and each cell stringing platform 1 can be driven to form a cyclic alternation and can intermittently stay upstream and downstream of each tape film cutting and segment making unit, which can further improve the rhythm of the cell stringing operation, and thus improve the operation efficiency and production capacity.

[0041] In some embodiments, a passage space (not shown and not indexed in the figure) for the cell stringing platform 1 to pass through is formed below the solder tape carrier 21 and the adhesive film carrier 22 in each tape film cutting and segment making unit. The cell stringing platform 1 reciprocates in the passage space along the linear movement direction.

[0042] In this technical solution, the area below each solder tape carrier 21 and the adhesive film carrier 22 serves as the translation channel for the cell stringing platform 1, while the upper part serves as the carrier platform for the solder tape segments and the adhesive film segments. At the same time, other functional components of the tape film cutting and segment making unit are also correspondingly arranged on the bearing planes respectively possessed by the solder tape carrier 21 and the adhesive film carrier 22, which can make more reasonable use of the device space and the structure is more compact.

[0043] In a specific embodiment, there are two sets of the film - belt cutting and segment - making units. In each film - belt cutting and segment - making unit, a set of solder - strip cutting assemblies (not shown and not indexed in the figure) including the solder - strip bearing table 21 and a set of adhesive - film cutting assemblies (not shown and not indexed in the figure) including the adhesive - film bearing table 22 are respectively arranged. One of the two sets of film - belt cutting and segment - making units is used for cutting the solder - strip segments serving as the positive electrodes and the adhesive - film segments corresponding to the lengths of the solder - strip segments of the positive electrodes, and the other set is used for cutting the solder - strip segments serving as the negative electrodes and the adhesive - film segments corresponding to the lengths of the solder - strip segments of the negative electrodes. In one of the adhesive - film cutting assemblies, the solder - strip segments on the solder - strip bearing table 21 and the adhesive - film segments on the adhesive - film bearing table 22 are placed at intervals along the length direction of the solar cell on the back surface of the solar cell. Specifically, see Figure 2 As shown, the film - belt cutting and segment - making unit on the left side (i.e., the upstream side in the linear direction) is the first segment - making unit, and the film - belt cutting and segment - making unit on the right side (i.e., the downstream side in the linear direction) is the second segment - making unit. Taking the first segment - making unit corresponding to the positive - electrode solder strip and the second segment - making unit corresponding to the negative - electrode solder strip as an example, at this time, there are a first positive - electrode solder - strip pasting station 301 and a second positive - electrode solder - strip pasting station 302 on the upstream and downstream sides of the first segment - making unit respectively, and a first negative - electrode solder - strip pasting station 401 and a second negative - electrode solder - strip pasting station 402 on the upstream and downstream sides of the second segment - making unit respectively. In this way, the solar - cell stringing platform 1 can be driven to translate from left to right in sequence through the first positive - electrode solder - strip pasting station 301, the second positive - electrode solder - strip pasting station 302, the first negative - electrode solder - strip pasting station 401, and the second negative - electrode solder - strip pasting station 402, and place the corresponding solder - strip segments and adhesive - film segments at the target positions on the back surface of the solar cell at each station. This design can synchronously prepare multiple solar - cell strings when there are multiple solar - cell stringing platforms 1, further improving the stringing efficiency. Continuing to see Figure 2 As shown, the aforementioned film - belt handling mechanism 23 correspondingly includes a first film - belt handling arm 231, a second film - belt handling arm 232, a third film - belt handling arm 233, and a fourth film - belt handling arm 234. Each film - belt handling arm is correspondingly arranged with the corresponding solder - strip pasting station, ensuring the convenient and efficient handling and placement of the solder - strip segments and adhesive - film segments. It can be understood that after the positive - electrode solder - strip segments / negative - electrode solder - strip segments are placed and pasted on the back surface of the solar cell, the electrical connection of the positive - electrode solder - strip segments along the length direction of the solar - cell string and the electrical connection of the negative - electrode solder - strip segments along the length direction of the solar - cell string should be ensured.

[0044] In some embodiments, the length direction of the solar - cell stringing platform 1 is parallel to the length direction of the solder - strip segments on the solder - strip bearing table 21 and the length direction of the adhesive - film segments on the adhesive - film bearing table 22. In this way, when preventing the solder - strip segments and adhesive - film segments at the target positions on the back surfaces of the arranged solar cells, the posture of the film - belt handling mechanism 23 can be kept substantially consistent, which can simplify the control logic of the film - belt handling mechanism 23 and also improve the operation efficiency.

[0045] In some embodiments, before arranging each cell along the length direction of the cell stringing platform 1 in sequence, it further includes a cell pre-arrangement step:

[0046] The cells in the cell loading unit (not labeled in the figure) are sequentially laid flat on the pre-arrangement platform, so that a positive spacing is formed between adjacent cells, that is, there is a gap penetrating from the front side to the back side of the cell between the length ends of two adjacent cells; or, the cells in the cell loading unit are sequentially laid flat on the pre-arrangement platform, so that a negative spacing is formed between adjacent cells, that is, the length ends of two adjacent cells are stacked and overlapped with each other without generating a gap penetrating from the front side to the back side of the cell. After pre-arrangement, the cells are integrally transported to the cell stringing platform 1 by a cell translation mechanism (not shown and not labeled in the figure). Specifically, refer to Figure 2 As shown, a cell pre-arrangement platform 4 is provided in the area between the cell loading unit and the cell stringing platform 1. At this time, the cell pre-arrangement platform 4 also forms a cell pre-arrangement station 100. The cell handling mechanism 31 of the cell loading unit is disposed adjacent to the cell pre-arrangement platform 4, so as to be able to place the uniformly sized cells cut in the cell loading unit on the cell pre-arrangement platform 4 one by one to achieve pre-arrangement of positive or negative spacing between two adjacent cells according to actual operation requirements.

[0047] In this technical solution, after arranging the cells supplied by the cell loading unit one by one on the cell pre-arrangement platform 4 and then integrally transferring and placing them on the cell stringing platform 1, corresponding to the working conditions of multiple cell stringing platforms 1, the time-consuming for arranging cells on each cell stringing platform 1 is reduced, and the stringing efficiency can be further improved.

[0048] Refer to Figure 2 As shown, the cell loading unit further includes a laser scribing mechanism 32, a cell rotating mechanism 33, and a vision recognition mechanism 34, which are conventional devices in the art and will not be elaborated here.

[0049] In a specific embodiment, when a positive spacing is formed between the pre-arranged cells, after the pre-arranged cells are integrally transported to the cell stringing platform 1, a light-shielding strip is attached to the positive spacing area between two adjacent cells to improve the appearance consistency and aesthetics of the cell string. It can be understood that refer to Figure 2As shown, correspondingly, on the linear translation path of the cell stringing platform 1 between the cell stringing platform 1 and the film - attached cutting and segment - making unit, there is a light - shielding strip attaching station 200. Adjacent to this station, there are a light - shielding strip preparation unit 5 for preparing light - shielding strips and a light - shielding strip handling mechanism 51 for handling light - shielding strips. The light - shielding strip preparation unit 5 and the light - shielding strip handling mechanism 51 can adopt relevant mechanisms in the prior art, and the present invention does not improve their specific structures. At this time, each cell stringing platform 1 is first driven to translate linearly from its original position (i.e., the downstream side of the cell pre - arranging station 100) to the light - shielding strip attaching station 200 for attaching light - shielding strips. Then, the cells arranged in columns with attached light - shielding strips follow the cell stringing platform 1 to further translate to subsequent solder tape pasting stations (i.e., the first positive - electrode solder tape pasting station 301, the second positive - electrode solder tape pasting station 302, the first negative - electrode solder tape pasting station 401, and the second negative - electrode solder tape pasting station 402) for the pasting operations of solder tape segments and adhesive film segments.

[0050] In some embodiments, after the cut - prepared solder tape segments and adhesive film segments are sequentially placed on the back of each cell, the back of each cell is further pressed. That is, after the cell string is covered with the film, the cell stringing platform 1 is controlled to translate downstream along the linear direction to the film - attached pressing station 500. At this station, by pressing the adhesive film segment on the cell stringing platform 1, the probability of the solder tape segment shifting caused by the non - tight attachment of the adhesive film segment can be reduced, thereby further improving the yield rate of the cell stringing. The negative pressure on the back of the cell can be specifically realized by rolling the back of the cell with a roller having a certain flexibility (not shown and not indexed in the figure). After the pressing is completed, the cell stringing device is controlled to continue translating downstream along the line to the cell string removal station 600. The corresponding handling device removes the cell string on the cell stringing platform 1 at this station, and then controls the cell stringing platform 1 to gradually reset to its original position.

[0051] The following combines Figure 2 and Figure 5 as shown to further elaborate on the technical solution of the present invention:

[0052] Before the cell is transported from the cell loading mechanism (i.e., the aforementioned cell loading unit, the same below) to the stringing platform (i.e., the aforementioned cell stringing platform 1, the same below), it is necessary to first transport the cell to the cell prefabrication platform (i.e., the aforementioned cell pre-arrangement platform 4) for pre-arrangement of the cells. When pre-arranging the cells, the cell handling robot (i.e., the aforementioned cell handling mechanism 31, the same below) first places one of the two cells adsorbed simultaneously on the cell prefabrication platform (the cell handling robot transports two cells at a time because the cells are loaded as whole pieces and are formed into two cells after laser scribing to the waiting transportation station), and then adjusts the position of the cell handling robot to place the other cell on the cell prefabrication platform. This cell placement method can achieve two cell arrangement methods, namely negative-spacing cell arrangement and positive-spacing cell arrangement, which is convenient to meet the production requirements of different cell strings;

[0053] There is a light-shielding strip preparation mechanism (i.e., the aforementioned light-shielding strip attachment unit 5, the same below) between the cell loading mechanism and the first station (i.e., the aforementioned first positive electrode solder tape pasting station 301, the same below). The light-shielding strip preparation mechanism can cut the light-shielding strip into the required length and perform spacing. The spaced light-shielding strips are transported by the light-shielding strip handling robot to the stringing platform and the light-shielding strips are attached to the cells on the stringing platform;

[0054] When the stringing platform moves to the first station, the film strip handling robot (i.e., the aforementioned film-carrying handling mechanism 23, the same below) first adsorbs the first film strip (i.e., the aforementioned film segment, generally including multiple segments arranged at intervals along the length direction of the film, such as the odd-numbered segments among the multiple adjacent film segments formed by cutting, such as the first segment, the third segment, the fifth segment...), and then transports it to the solder tape preparation mechanism to grab the first solder tape (i.e., the aforementioned solder tape segment, generally including multiple segments arranged at intervals along the length direction of the solder tape, such as the odd-numbered segments among the multiple adjacent solder tape segments formed by cutting, such as the first segment, the third segment, the fifth segment...). After that, the film strip handling robot moves above the cell, first makes the first solder tape attach to the surface grid lines of the cell, and then performs the attachment of the first film strip to complete the first solder tape film covering of the cell.

[0055] When the series-making platform moves to the second station (i.e., the aforementioned second positive electrode welding tape pasting station 302, the same below), the film tape handler first adsorbs the second section of the film strip (for example, the even-numbered section among multiple adjacent adhesive film sections formed by cutting, such as the second section, the fourth section, the sixth section...), then transports it to the welding tape preparation mechanism to grasp the second section of the welding tape (for example, the even-numbered section among multiple adjacent welding tape sections formed by cutting, such as the second section, the fourth section, the sixth section...). After that, the film tape handler moves above the solar cell, first makes the second section of the welding tape adhere to the surface grid lines of the solar cell, and attaches the second section of the welding tape to the solar cell and connects it to the first section of the welding tape, and then attaches the second section of the film strip to complete the film covering of the second section of the welding tape on the solar cell;

[0056] When the series-making platform moves to the third station (i.e., the aforementioned first negative electrode welding tape pasting station 401, the same below), the film tape handler first adsorbs the third section of the film strip, then transports it to the welding tape preparation mechanism to grasp the third section of the welding tape. After that, the film tape handler moves above the solar cell, first makes the third section of the welding tape adhere to the surface grid lines of the solar cell, and the third welding tape is staggeredly distributed with the first welding tape on the solar cell of the series-making platform, and then the third section of the film strip is attached to complete the film covering of the third section of the welding tape.

[0057] When the series-making platform moves to the fourth station (i.e., the aforementioned second negative electrode welding tape pasting station 402, the same below), the film tape handler first adsorbs the fourth section of the film strip, then transports it to the welding tape preparation mechanism to grasp the fourth section of the welding tape. After that, the film tape handler moves above the solar cell, first makes the fourth section of the welding tape adhere to the surface grid lines of the solar cell, and attaches the fourth section of the welding tape to the solar cell and connects it to the third section of the welding tape, and then attaches the fourth section of the film strip to complete the film covering of the fourth section of the welding tape.

[0058] After the film covering of the four sections of the welding tape on the battery string is completed, the series-making platform is transported to the re-pressing station (i.e., the aforementioned film-covered re-pressing station 500, the same below), and the re-pressing station re-presses the film strips on the solar cell.

[0059] The battery string after re-pressing is taken out (the series-making platform of the battery string moves to the aforementioned battery string picking-up station), and the series-making platform of the battery string resets to a position close to the solar cell loading mechanism, thus completing the complete process of series-making preparation of the battery string on one series-making platform of the battery string.

[0060] According to an embodiment of the present invention, there is also provided a series-making device for performing the above-mentioned BC type battery string series-making method, including: a solar cell loading unit, a solar cell series-making platform 1, a film-covered cutting and segmenting unit, and a film-covered handling mechanism 23, wherein the solar cell series-making platform 1 can be driven along the width direction of the solar cells arranged thereon (i.e., Figure 2It moves translationally in a linear direction parallel to the left-right direction (in the indicated orientation), and the cell loading unit is on the upstream side of the linear direction, while the film-carrying cutting and segmenting unit is on the downstream side of the linear direction. The cells in the cell loading unit can be arranged along the length direction of the cell stringing platform 1. The film-carrying cutting and segmenting unit is used to prepare solder ribbon segments and adhesive film segments and place the prepared solder ribbon segments and adhesive film segments on the solder ribbon carrying platform 21 and the adhesive film carrying platform 22 it has. The film-carrying handling mechanism 23 is used to place the solder ribbon segments and adhesive film segments in the film-carrying cutting and segmenting unit from top to bottom on the back of the corresponding cells when the cell stringing platform 1 is at the station corresponding to the film-carrying cutting and segmenting unit, so that each adhesive film segment fixes the corresponding solder ribbon segment on the back of the cell.

[0061] 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 various methods can be freely combined and superimposed.

[0062] 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 connecting BC type battery strings in series, characterized in that, The method includes the following steps: Arrange the battery cells on the battery cell stringing platform (1) in sequence along the length direction of the battery cell stringing platform (1), and make the back sides of the battery cells face upward; Place the cut solder strip segments and the cut film segments in sequence at the target positions on the back sides of the battery cells to connect the adjacent battery cells into a battery string. The solder strip segments and the cut film segments are prepared by cutting with a film-carrying cutting and segmenting unit. The solder strip segments and the cut film segments prepared by the film-carrying cutting and segmenting unit are respectively placed on the solder strip carrier (21) and the film carrier (22) of the film-carrying cutting and segmenting unit. When placing the solder strip segments and the cut film segments, control the battery cell stringing platform (1) to be located in the area close to the film-carrying cutting and segmenting unit.

2. The method for stringing BC type battery strings according to claim 1, wherein The placement of the solder strip segments and the cut film segments is performed by a film-carrying handling mechanism (23). The film-carrying handling mechanism (23) can be controlled to hold the solder strip segments after adsorbing the cut film segments, so as to form a hierarchical layout with the cut film segments on the top and the solder strip segments on the bottom.

3. The method for stringing BC-class battery strings according to claim 1, wherein The battery cell stringing platform (1) has a plurality of platforms, and all of them can be driven to move in a straight line in a cyclic and alternating manner. At least two groups of film-carrying cutting and segmenting units are configured. Each film-carrying cutting and segmenting unit is arranged at intervals along the straight-line moving direction of the battery cell stringing platform (1). Each battery cell stringing platform (1) is controlled to intermittently stay upstream and downstream of each film-carrying cutting and segmenting unit relative to the straight-line moving direction along the straight-line moving direction, and when the battery cell stringing platform (1) intermittently stays, place the cut solder strip segments and the cut film segments in the nearest film-carrying cutting and segmenting unit at the target positions on the back sides of the battery cells.

4. The method for stringing BC-class battery strings according to claim 3, wherein, A passage space for the passage of the battery cell stringing platform (1) is formed in the lower regions of the solder strip carriers (21) and the film carriers (22) in each film-carrying cutting and segmenting unit. The battery cell stringing platform (1) reciprocates in the passage space along the straight-line moving direction.

5. The method for stringing BC-class battery strings according to claim 3, wherein, There are two groups of film-carrying cutting and segmenting units. In each film-carrying cutting and segmenting unit, a solder strip cutting assembly including the solder strip carrier (21) and a film cutting assembly including the film carrier (22) are respectively arranged. One of the two groups of film-carrying cutting and segmenting units is used to cut the solder strip segments as the positive electrode and the cut film segments corresponding to their lengths, and the other group is used to cut the solder strip segments as the negative electrode and the cut film segments corresponding to their lengths. In one film cutting assembly, the solder strip segments on the solder strip carrier (21) and the cut film segments on the film carrier (22) are placed at intervals along the length direction of the battery cell on the back side of the battery cell.

6. The method for stringing BC type battery strings according to claim 2, characterized in that, Before the film-carrying handling mechanism (23) holds the solder strip segments, control the two ends of the solder strip segments to be held to lift upward; and / or, the length direction of the battery cell stringing platform (1) is parallel to the length direction of the solder strip segments on the solder strip carrier (21) and the length direction of the cut film segments on the film carrier (22).

7. The method for stringing BC type battery strings according to claim 1, wherein, Before arranging the battery cells in sequence along the length direction of the battery cell stringing platform (1), it further includes a battery cell pre-arrangement step: The battery cells in the battery cell loading unit are laid flat on the pre-arrangement platform in sequence, so that a positive spacing is formed between adjacent battery cells; or, the battery cells in the battery cell loading unit are laid flat on the pre-arrangement platform in sequence, so that a negative spacing is formed between adjacent battery cells, and the pre-arranged battery cells are integrally transported onto the battery cell stringing platform (1).

8. The method for stringing BC-class battery strings according to claim 1, wherein, After sequentially placing the cut solder strip segments and adhesive film segments on the back surfaces of the battery cells, the back surfaces of the battery cells are further pressed.

9. The method for stringing BC-class battery strings according to claim 7, characterized in that, When a positive spacing is formed between the pre-arranged battery cells, after the pre-arranged battery cells are integrally transported onto the battery cell stringing platform (1), a light-shielding strip is attached to the positive spacing area between two adjacent battery cells.

10. A series connection device for BC type battery strings, characterized in that, It includes: A battery cell loading unit, a battery cell stringing platform (1), a strip film cutting and segment preparing unit, and a strip film handling mechanism (23). Among them, the battery cell stringing platform (1) can be driven to translate in a straight line parallel to the width direction of the battery cells arranged thereon, and the battery cell loading unit is on the upstream side of the straight line direction, and the strip film cutting and segment preparing unit is on the downstream side of the straight line direction. The battery cells in the battery cell loading unit can be arranged along the length direction of the battery cell stringing platform (1). The strip film cutting and segment preparing unit is used to prepare solder strip segments and adhesive film segments and place the prepared solder strip segments and adhesive film segments on the solder strip carrying platform (21) and the adhesive film carrying platform (22) it has. The strip film handling mechanism (23) is used to place the solder strip segments and adhesive film segments in the strip film cutting and segment preparing unit on the back surfaces of the corresponding battery cells when the battery cell stringing platform (1) is at the working position corresponding to the strip film cutting and segment preparing unit.

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