Method and device for preparing a pasting module for a battery string and method for preparing a battery string

Abstract

The application discloses a preparation method and device of a battery string sticking module and a battery string preparation method, relates to the technical field of photovoltaic module production, and comprises the following steps: cutting a whole film strip into a film strip with a predetermined length; cutting the film strip into an end film strip containing a plurality of independent film strips arranged at intervals along a second direction and a plurality of groups of middle film strips arranged on one side of the end film strip along a first direction, wherein a vacant connection area is arranged between the independent film strips, the vacant connection area corresponds to a group of electrode areas on a vacant battery piece at the end of the battery string, and the electrode areas are not connected by a welding strip; and the welding strip does not need to extend out of the battery piece, and is suitable for a low-temperature interconnection technology of a full-screen photovoltaic module, so that the overall appearance and photoelectric conversion efficiency of the module are improved, and the risk of hidden cracks caused by thermal stress is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery string production technology, and in particular to a method, apparatus, and battery string preparation method for preparing adhesive modules for battery strings. Background Technology

[0002] In the fabrication of a back-contact full-screen photovoltaic module, the busbar needs to be directly welded to the solder strip on the surface of the cell. The back of the cell has two sets of staggered positive and negative grid lines. One set of positive or negative grid lines needs to be directly welded to the busbar, while the other set needs to be covered by an insulating film to achieve electrical isolation and ensure unidirectional current conduction.

[0003] In existing technologies, the solder strips and busbars are connected in groups by punching holes in the insulating film. The insulating film on the upper part of one group of solder strips that need to be connected to the busbar is punched to expose the solder strips for welding, while the other group of solder strips is completely covered by the insulating film to achieve insulation isolation. However, the punching process requires high precision and is prone to hole misalignment, film damage, or uneven exposure of the solder strips, which can lead to short circuits or poor soldering risks, affecting the yield and long-term reliability of the components. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for preparing a bonding module for battery strings and a string-making device.

[0005] In a first aspect, this application provides a method for preparing a battery string bonding module, comprising: including: Cut the film strip to the predetermined length; The entire film strip is cut into end film strips comprising a plurality of independent film strips spaced apart along a second direction, and a plurality of middle film strips disposed on one side of the end film strips along a first direction. The plurality of independent film strips are provided with empty connection areas spaced apart along the second direction. The plurality of middle film strips are adapted to cover the solder strip groups covering the positive electrode connection areas and negative electrode connection areas on a plurality of battery cells in the battery string. The end film strips are adapted to cover the solder strip groups covering the positive electrode connection areas or negative electrode connection areas on the surface of the end battery cells in the battery string. The empty connection areas are adapted to the positive electrode connection areas or negative electrode connection areas on the surface of the end battery cells.

[0006] Furthermore, the middle section membrane strip includes a single membrane sheet or several independent membrane strips arranged at intervals along the second direction, or several independent membrane strips arranged in an alternating pattern along the second direction. The single membrane sheet has multiple solder strip groups on the battery cells, excluding the battery cells at the beginning and / or end of the battery string. The several independent membrane strips cover all the solder strip groups on one or more battery cells at intervals.

[0007] Furthermore, when both the end membrane strip and the middle membrane strip are independent membrane strips, it includes: The whole film strip is cut into several parallel independent long film strips along the first direction, and then the several parallel long film strips are cut vertically into several groups of independent film strips along the second direction to form the middle section film strip and the end film strip. Alternatively, the entire membrane strip can be cut into individual membrane pieces along the second direction, and each of the individual membrane pieces can be cut into several independent membrane strips along the first direction to form the middle membrane strip and the end membrane strip.

[0008] Furthermore, when the number of independent membrane strips in the end membrane strip is N, Furthermore, after cutting the whole film strip into end film strips comprising several independent film strips spaced apart along the second direction, and several groups of middle film strips disposed on one side of the end film strips along the first direction, the method further includes: separating the adjacent ends of the end film strips and the several groups of middle film strips by a predetermined distance or overlapping them into a negative distance.

[0009] M independent film strips are transported at intervals along the second direction as end film strips in the first set of adhesive modules, and P independent film strips remaining along the second direction are used as end film strips in the second set of adhesive modules, where M+P=N, and M, P, and N are all positive integers; The empty area between the M independent membrane strips during the interval transport is the empty connection area in the end membrane strip of the first adhesive module, and the empty area between the remaining P independent membrane strips is the empty connection area in the end membrane strip of the second adhesive module.

[0010] Furthermore, the process of intermittently transporting the M independent membrane strips also includes: transporting several of the intermediate membrane strips as a first set of adhesive modules. Prepare and transport the next set of mid-section membrane strips and lay them on one side of the remaining P independent membrane strips as the second set of adhesive modules.

[0011] Furthermore, it also includes: continuously preparing at least two sets of adhesive modules, and stacking the end film strip of one of the two sets of adhesive modules at adjacent ends along the first direction with the empty connection area of ​​the other, so that the end film strips at both ends of the two sets of adhesive modules are arranged alternately at intervals.

[0012] Furthermore, it also includes: continuously preparing at least two sets of adhesive modules, separately preparing a number of independent membrane strips arranged at intervals along the second direction to form an intermediate membrane strip group, and overlapping the intermediate membrane strip group with two sets of empty connection areas at the adjacent ends of the two sets of adhesive modules.

[0013] Secondly, this application also proposes an adhesive module preparation apparatus, which applies any of the adhesive module preparation methods described above, including: A membrane roll mechanism is used to provide continuous film feeding at the end and middle sections of the membrane roll; A membrane head traction mechanism is used to control the end of the membrane belt and pull the entire membrane belt of a predetermined length. The film carrier platform is used to support the end film strips and the middle film strips; A cutting mechanism is used to cut the whole film strip into middle film strips and end film strips.

[0014] Furthermore, the film carrier platform is located below the cutting mechanism and is movably arranged in at least two sets in the film belt pulling direction. Each set of the film carrier platform corresponds to at least one set of middle section film belt and end film belt.

[0015] Furthermore, the film carrier stage includes multiple intermediate film carrier units arranged along the film belt traction direction and end film carrier units located at one or both ends of the stage. The upper surfaces of the intermediate film carrier units and the end film carrier units are provided with an adsorption hole array matching the width of the film belt. The adsorption hole array on the end film carrier unit includes a first adsorption array and a second adsorption array arranged at intervals. The first adsorption array and the second adsorption array are connected to two independent vacuum control modules.

[0016] Furthermore, the cutting mechanism includes a first film cutting mechanism and a second film cutting mechanism arranged in succession. The first film cutting mechanism is used to cut the whole film strip into several film strips along a first direction, and the second film cutting mechanism is used to cut the whole film strip into film sheets or film strips of segmented lengths along a second direction.

[0017] Thirdly, this application proposes a method for preparing a battery string, which, using any of the above-described methods for preparing a bonding module, further includes: A number of solar cells are arranged along the first direction, with the first and last solar cells located at the beginning and end of the solar cells respectively. A plurality of end weld strips and middle weld strips are prepared, which are parallel to each other in a first direction. One end of each end weld strip extends beyond one end of each middle weld strip by a predetermined length. A weld strip connection area is reserved between the end weld strips of the predetermined length in a second direction. The end solder strips and the middle solder strips are stacked on the surface of several battery cells, so that the reserved solder strip connection area is connected to one of the positive or negative grid lines on the first or last battery cell. The end film strip and the middle film strip in the pasting module are respectively covered on the outside of the end welding strip and the middle welding strip and fixed to the surface of the battery cell. The reserved welding strip connection area is superimposed on the empty connection area, so that the other of the positive grid line or the negative grid line on the end battery cell is exposed.

[0018] Furthermore, after the end film strip and middle film strip in the pasting module are respectively covered on the outside of the end solder strip and the middle solder strip and fixed to the surface of the battery cell, the method further includes: preparing a pre-fabricated solder strip group arranged along the second direction and a pre-fabricated film strip group corresponding to the pre-fabricated solder strip group, as well as a busbar for connecting with the pre-fabricated solder strip group; transferring the pre-fabricated solder strip group, the pre-fabricated film strip group and the busbar stepwise or synchronously to the first or last battery cell in the battery string group to electrically connect the pre-fabricated solder strip group to the exposed positive or negative grid line; and the pre-fabricated film strip group is covered and pasted on the surface of the pre-fabricated solder strip group.

[0019] Furthermore, before transferring the prefabricated ribbon assembly and prefabricated membrane strip assembly to the battery string assembly, the method further includes welding the busbar to the prefabricated ribbon to form a prefabricated conductor.

[0020] Furthermore, the end solder strips and middle solder strips are overlapped with the adhesive module and hot-pressed to form a conductor adhesive. The conductor adhesive is then precisely applied to the corresponding grid lines of the battery cell to complete the electrical connection.

[0021] The battery string bonding module fabrication method proposed in this invention is applicable to the back contact structure of another full-screen component. The solder ribbons on the surface of the battery string are positioned onto the surface of the battery cells via the bonding module. The bonding module adapts to multiple battery cells arranged in a battery string configuration, forming multiple solder ribbon groups for series-connected battery cells. The bonding module and solder ribbon assembly overlap with the busbar to identify the missing positive or negative solder ribbon lead on the surface of the corresponding battery cell. The missing solder ribbon is placed on the surface of the battery cell through subsequent processes. The subsequently placed solder ribbon connects to a grid line of one polarity on the corresponding battery cell. The busbar is directly electrically connected to the subsequently placed solder ribbon group and electrically isolated from the battery cell surface and the other solder ribbon group covered by an insulating film, thereby ensuring stable unidirectional current transmission. This design abandons the complex drilling process of existing insulating film tapes, instead using a bonding module to firmly connect to the solder ribbons on the battery cell. The precise positioning of the solder ribbons at the end of the bonding module overlapping with the busbar ensures precise spatial matching between the insulating film tape and the solder ribbon assembly, significantly reducing the risk of process deviations. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the first adhesive module proposed in this invention; Figure 2This is a schematic diagram of a battery string structure proposed in this invention; Figure 3 This is a schematic diagram of the structure of the second type of adhesive module proposed in this invention; Figure 4 This is a schematic diagram of the structure of the third type of adhesive module proposed in this invention; Figure 5 This is a schematic diagram of the structure of the first adhesive module preparation method proposed in this invention; Figure 6 This is a schematic diagram of the structure of the second adhesive module preparation method proposed in this invention; Figure 7 This is a schematic diagram of the third adhesive module preparation method proposed in this invention; Figure 8 This is a schematic diagram of the fabrication apparatus for the battery string bonding module proposed in this invention.

[0024] The attached figures are labeled as follows: a. Empty connection area; 10. End film strip; 11. Independent film strip; 20. Middle film strip; 30. Welding strip group; 40. Battery cell; 50. First adhesive module group; 60. Second adhesive module group; 70. Middle film strip group; 100. Film roll mechanism; 200. Film head traction mechanism; 300. Film carrier platform; 301. End film carrier unit; 302. Middle film carrier unit; 400. Cutting mechanism; 401. First film cutting mechanism; 402. Second film cutting mechanism. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of the above embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0026] It should be understood that the following embodiments do not limit the execution order of the steps in the method protected by this application. The steps of the method of this application can be executed in any possible order and in a cyclic manner without contradicting each other.

[0027] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "front", "back", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The battery string bonding module preparation method proposed in this invention is applicable to the back contact structure of another full-screen component. The battery string in this full-screen uses a low-temperature bonding process, which achieves reliable bonding between the solder ribbon and the battery cell 40 under low-temperature conditions through the adhesive film, effectively avoiding damage to the silicon wafer and passivation layer caused by high temperature.

[0032] like Figure 1-3 As shown, before forming in the full-screen assembly, a set of solder ribbons 30 for electrical connection with the busbar is missing at the ends of the multiple battery strings arranged in the array. Therefore, the adhesive film used to attach the solder ribbons 30 also needs to have a reserved area for the adhesive film corresponding to the solder ribbons 30 at both ends.

[0033] Based on the above-mentioned low-temperature interconnection battery string technology using adhesive film, this application proposes a method for preparing an adhesive module suitable for the above-mentioned battery string, comprising: cutting a whole film strip of a predetermined length; The membrane strip is cut into end membrane strips 10 comprising several independent membrane strips 11 spaced apart along a second direction, and several sets of middle membrane strips 20 disposed on one side of the end membrane strips 10 along a first direction. The several independent membrane strips 11 are spaced apart along the second direction with empty connection areas a. The several sets of middle membrane strips 20 are adapted to cover the solder ribbon groups 30 covering the positive electrode connection areas and negative electrode connection areas on the battery cells 40 in the battery string. The end membrane strips 10 are adapted to cover the solder ribbon groups 30 covering the positive electrode connection areas or negative electrode connection areas on the surface of the end battery cells 40 in the battery string. The empty connection areas a are adapted to the empty positions of the solder ribbon groups 30 covering the positive electrode connection areas or negative electrode connection areas on the surface of the end battery cells 40. The first and second directions are perpendicularly arranged, and the several battery cells 40 and solder ribbon groups 30 arranged in the first direction are connected in series to form a battery string.

[0034] The plurality of intermediate membrane strips 20 disposed on one side of the end membrane strips 10 include: the end membrane strips 10 being located at one or both ends of the plurality of intermediate membrane strips 20, and each independent membrane strip 11 in the end membrane strips 10 at both ends being symmetrically or staggeredly arranged on both sides of the intermediate membrane strips 20, with one of the end membrane strips 10 at both ends corresponding to the positive electrode connection area on the surface of the end cell 40 of the battery string, and the other corresponding to the negative electrode connection area on the surface of the end cell 40 of the battery string (see staggered arrangement for details). Figure 6 (The paste module shown).

[0035] In some embodiments, the middle section membrane strip 20 includes a single membrane sheet or a plurality of independent membrane strips 11 arranged continuously along the second direction or a plurality of independent membrane strips 11 arranged in an alternating pattern along the second direction (see [reference]). Figure 3 The middle section membrane strip 20 is a single membrane sheet. Figure 2 The middle section membrane strip 20 consists of several independent membrane strips 11. Figure 4 The middle section membrane strip 20 consists of several independent membrane strips 11 arranged in an alternating pattern. Each membrane strip covers the entire positive electrode connection area and negative electrode connection area of ​​the solder ribbon group 30 on one or more solar cells 40. When a single membrane strip covers the entire solder ribbon group 30 of multiple solar cells 40, it covers the solder ribbon connection area between adjacent solar cells 40, connecting multiple solar cells 40 at once. Using a single membrane strip can significantly improve bonding efficiency and consistency, and reduce process error rate. The independent membrane strip 11 design facilitates precise adaptation to different solar cell 40 spacings and electrode layouts, taking into account the position of the solder ribbon group 30 laid at intervals on different electrodes on the solar cells 40, and further saves the amount of adhesive film used to fix the solder ribbons on the solar cells 40, improving material utilization.

[0036] like Figure 4As shown, when the middle section film strip 20 consists of independent film strips 11 spaced apart along the second direction, there are gaps between the end film strip 10 and each independent film strip 11 of the middle section film strip 20, and they are staggered at the beginning and end. The staggered portions of each film strip correspond to and jointly cover two different electrode connection areas on a single solar cell 40. The outermost end of the end film strip 10 extends beyond the end of the middle section film strip 20 by a predetermined length. The end solder strip of this predetermined length is provided with empty connection areas a at intervals in the second direction. The other end of the end solder strip and one end of the adjacent middle section solder strip are staggered at intervals in the second direction by a certain length. The staggered portions correspond to and cover two sets of staggered solder strip groups 30 on the surface of a solar cell 40. The two sets of staggered solder strip groups 30 respectively connect to the two electrode connection areas spaced apart on the solar cell 40.

[0037] Specifically, when the end membrane strip 10 and the middle membrane strip 20 are both independent membrane strips 11, the process includes: cutting the whole membrane strip into several ordinary independent long membrane strips along the first direction, and then cutting the several ordinary independent long membrane strips vertically into several groups of independent membrane strips 11 along the second direction to form the independent membrane strips 11 required for the end membrane strip 10 and the middle membrane strip 20. Alternatively, the entire membrane strip can be pre-cut vertically along the second direction into multiple individual membrane pieces, and then each individual membrane piece can be cut along the first direction into independent membrane strips 11 of the required size for the end membrane strip 10 and the middle membrane strip 20; Both cutting methods can complete the cutting of film strips corresponding to multiple battery cells at 40 stations in one direction at a time, greatly improving processing efficiency; and the cutting path is regular and the edges are neat.

[0038] The ends of the cut end film strip 10 and several sets of middle section film strips 20 are either far apart or close to each other. When they are far apart, their ends are separated by a preset distance so that they do not contact each other, matching the length of the welding strip group on the surface of the cell. When they are close together, their ends are overlapped with a negative spacing so that their ends are connected by a certain distance, supplementing the surface of the welding strip beyond the edge of the cell, providing filling material for the gaps between cells in the subsequent cell string lamination process, and improving the lamination vacuum efficiency.

[0039] Furthermore, such as Figure 5 As shown, when the end film strip 10 and the middle film strip 20 are cut in one go, when the number of independent film strips 11 in the end film strip 10 is N, M independent film strips 11 are transported at intervals along the second direction as the end film strips 10 in the first set of pasting modules 50, and the remaining P independent film strips 11 along the second direction are used as the end film strips 10 in the second set of pasting modules 60, where M+P=N, and M, P, and N are all positive integers; The empty areas between the M independent film strips 11 transported at intervals are empty connection areas a in the end film strips 10 of the first set of adhesive modules 50. That is, the empty connection areas a are reserved gaps formed by the independent film strips 11 that have not been transported, which are used to adapt to the changes in the electrode spacing of the battery cells 40. The empty areas between the remaining P independent film strips 11 are empty connection areas a in the end film strips 10 of the second set of adhesive modules 60. That is, the empty connection areas a are the corresponding gaps left by the independent film strips 11 of the first set of adhesive modules 50 that have been transported away. The end film strips 10 in the first adhesive module and the second adhesive module share a set of independent film strips 11 that have been cut in one go. There is no need to cut and hollow out the empty connection areas a, which significantly reduces the complexity of the film strip structure preparation process and the manufacturing cost. In addition, the first set of adhesive modules 50 and the second set of adhesive modules 60 are prepared sequentially and continuously, and are used for two sets of battery string series structures, respectively.

[0040] The specific process steps are as follows: M independent film strips 11 are prepared in one go to form end film strips 10 for preparing two sets of battery strings. These M independent film strips 11 are then transported to the first bonding station. Simultaneously, the middle film strips 20, arranged in the first direction on the M independent film strips 11, are also transported to the first bonding station to jointly complete the preparation, transport, and bonding of the end and middle film strips 20 for the first set of battery strings. Subsequently, several more middle film strips 20 are prepared and transported to the side of the remaining P end film strips 10, where they are combined with the remaining P end film strips 10 to form the second bonding module 60. The second film strip preparation only requires the preparation of the middle film strips 20, eliminating the need to repeat the end film strip 10 cutting process. The entire film strip is directly cut along the first direction into several middle film strips. Only the corresponding number of end and middle film strips need to be prepared during transport, saving time on repeated positioning and cutting of the end film strips 10, significantly improving production line cycle time and equipment utilization.

[0041] In some embodiments, such as Figure 6 As shown, the method for preparing the battery string bonding module further includes continuously preparing at least two sets of the above-mentioned bonding modules. The end film strip 10 of one set of bonding modules at an adjacent end along the first direction is stacked correspondingly with the empty connection area a of the other set. The end film strips 10 at both ends of the two sets of bonding modules are arranged alternately and intermittently, forming a complementary arrangement to cover the solder strips on the two electrodes of a battery cell 40. Multiple sets of bonding modules prepared continuously are spliced ​​together to form a complete battery string covering structure, suitable for longer battery strings. The bonding modules can be prepared multiple times and then spliced ​​together to form a film strip layout that completely covers the entire battery cell 40. This solves the problems of inaccurate cutting and stretching deformation of the film strips required for longer battery strings, significantly improving the production efficiency and yield of large-size battery strings.

[0042] Optional, such as Figure 7 As shown, the preparation method of the battery string bonding module of the present invention may further include: continuously preparing two sets of bonding modules, wherein the first set of bonding modules 50 and the second set of bonding modules 60 are provided with a gap at their adjacent ends, and then separately preparing a number of independent film strips 11 arranged at intervals along the second direction to form an intermediate film strip group 70. The intermediate film strip group 70 is arranged at intervals with the first set of bonding modules 50 and the second set of bonding modules 60 in the second direction, accurately positioning and filling the empty connection area a of the two sets of bonding modules in the second direction, so as to ensure that the intermediate film strip group 70 and the end film strip 10 of the adjacent bonding module can accurately cover all the electrode welding strip groups 30 on one or two battery cells 40.

[0043] In another embodiment, the present invention also provides an adhesive module preparation apparatus, which includes a film rolling mechanism 100 for providing end film strips 10 and middle film strips 20, a film head traction mechanism 200 for controlling the ends of the film strips and moving them to a predetermined length, a film carrier stage 300 for carrying the end film strips 10 and middle film strips 20, and a cutting mechanism 400 for cutting the whole film strip that has been pulled to a predetermined length into end film strips 10 and middle film strips 20.

[0044] Optionally, the film carrier platform 300 is positioned below the cutting mechanism 400, and at least two sets are movably arranged in the film traction direction. Each set of film carrier platforms 300 corresponds to the positioning and bearing of the end film strip 10 and the middle film strip 20, respectively. The two sets of film carrier platforms 300 are arranged along the film traction direction and can be independently raised, lowered and moved horizontally. The two sets of cutting platforms cooperate with the cutting mechanism 400 in turn to complete the alternating cutting of the two sets of film strips. Each set of film strips may include multiple end film strips 10 and middle film strips 20, which improves cutting efficiency and positioning accuracy, while avoiding wrinkles or stretching deformation of the film strips due to uneven tension.

[0045] Furthermore, the film carrier stage 300 includes multiple intermediate film carrier units 302 arranged along the film traction direction for carrying the middle section film strip 20, and end film carrier units 301 located at one or both ends of the intermediate film carrier units 302 for carrying the end film strip 10. Each intermediate film carrier unit 302 and end film carrier unit 301 is equipped with an independent vacuum adsorption hole array. The adsorption hole array is precisely matched with the corresponding film strip carrying area to ensure that the film strip is free from displacement and wrinkles during the cutting and transfer process.

[0046] The adsorption hole array of the end film carrier unit 301 includes a first adsorption array and a second adsorption array arranged at intervals. The first adsorption array and the second adsorption array are connected to two independent vacuum control modules, which can adjust the adsorption force and start / stop sequence respectively. The first adsorption array and the second adsorption array are used to carry the cut end film strips 10, which are two sets of spaced and staggered independent film strips 11. Each set of independent film strips 11 corresponds to an end film strip 10 in the first set of pasting modules 50.

[0047] Furthermore, such as Figure 8 As shown, the cutting mechanism 400 also includes a first film cutting mechanism 401 and a second film cutting mechanism 402 arranged consecutively. The first film cutting mechanism 401 is used to cut the whole film strip into film strips along the first direction, and the second film cutting mechanism 402 is used to cut the whole film strip or film strip into segments along the second direction. The two film cutting mechanisms do not have a specific order and work together. First, the first film cutting mechanism 401 completes the transverse slitting, and then the second film cutting mechanism 402 performs longitudinal slitting according to a preset pitch. Alternatively, the second film cutting mechanism 402 completes the longitudinal slitting first, and then the first film cutting mechanism 401 performs transverse slitting according to a preset width. This achieves the synchronous forming and staggered arrangement of the end film strip 10 and the middle film strip 20, adapting to different battery cell 40 spacings and welding strip layouts.

[0048] In another embodiment, the present invention also provides a method for preparing battery strings, for example... Figure 2 or Figure 3 The battery string shown uses the aforementioned method for preparing the battery string bonding module, and also includes: A plurality of battery cells 40 are arranged along the first direction, with the first battery cell 40 and the last battery cell 40 located at the beginning and end of the plurality of battery cells 40, respectively. Prepare a plurality of end weld strips and middle weld strips that are parallel to each other in a first direction, wherein one end of the end weld strip extends beyond one end of the middle weld strip by a predetermined length, and the end weld strips of the predetermined length reserve a weld strip connection area between them in a second direction. The end solder strip and the middle section solder strip are stacked on the surface of several battery cells 40, so that the reserved solder strip connection area is correspondingly connected to one of the positive grid line or negative grid line on the first end battery cell 40 or the last end battery cell 40. The end film strip 10 and the middle film strip 20 in the pasting module are respectively covered on the outside of the end welding strip and the middle welding strip and fixed to the surface of the battery cell 40. The reserved welding strip connection area and the empty connection area a are projected and superimposed, so that the positive grid line or the negative grid line on the end battery cell 40 is exposed. That is, the first end battery cell 40 or the last end battery cell 40 is only covered with a welding strip segment that extends from the end welding strip to the middle welding strip of a preset length. This welding strip segment is only electrically connected to one type of electrode grid line on the corresponding battery cell 40, while the other type of electrode grid line remains exposed, reserving space for subsequent overlap of the reverse electrode welding strip with the adjacent battery string. The reverse electrode welding strip can be directly overlapped with the busbar.

[0049] The end film strip 10 can be located at the first or last end of a battery string, and its coverage area strictly corresponds to the end solder strip extension section and the corresponding electrode grid line. Alternatively, it can be configured at both the first and last ends of the battery string to achieve a double-ended lead-out structure.

[0050] To facilitate the subsequent fabrication of the full-screen components, after the end film strip 10 and the middle film strip 20 in the bonding module are respectively covered on the outside of the end solder strip and the middle solder strip and fixed to the surface of the battery cell 40, the process further includes: preparing a prefabricated solder strip group arranged along the second direction, a prefabricated film strip group corresponding to the prefabricated solder strip group, and a busbar for connecting with the prefabricated solder strip group. The prefabricated solder strip group, the prefabricated film strip group, and the busbar are simultaneously or stepwise transferred to the first and last battery cells 40 in the battery string group. The prefabricated solder strip group is electrically connected to the exposed positive or negative grid lines. The prefabricated film strip group covers the outside of the prefabricated solder strip group and is fixed to the surface of the battery cell 40. The busbar is crimped and connected to the end of the prefabricated solder strip group.

[0051] The step-by-step and synchronous transfer can be flexibly adjusted according to the process and equipment operation to adapt to the different production line cycle times and precision requirements. Furthermore, any one or any combination of the prefabricated welding ribbon group, the prefabricated film strip group, and the busbar can be transferred step-by-step, or all three can be completed synchronously. When the prefabricated film strip group and the prefabricated welding ribbon group are transferred synchronously, they can also be stacked and pre-bonded before being transferred to the surface of the battery cell 40, and then reliable bonding with the welding ribbon and battery cell 40 can be achieved through hot pressing or UV curing. After bonding, the prefabricated welding ribbon group and the busbar are pressed together to conduct electricity. Synchronous transfer can improve efficiency, while step-by-step transfer is conducive to welding ribbon positioning and correction and precise control of film strip tension.

[0052] Optionally, before transferring the prefabricated ribbon group, prefabricated membrane strip group, and busbar to the battery string group, the method further includes pre-welding the busbar to the prefabricated ribbon group to form a prefabricated conductor, and then transferring the prefabricated conductor to electrically connect with the exposed positive or negative grid lines of the first or last battery cell 40 in the battery string group, thereby realizing the conduction between the battery string group and the external circuit.

[0053] For example, the busbar can be simultaneously welded to multiple prefabricated strip groups to simultaneously complete the parallel conduction at the ends of multiple battery strings.

[0054] In another embodiment, the end solder strip and the middle solder strip can be pre-stacked with the adhesive module, and the two can be bonded together as a conductor adhesive by low-temperature heating. The reserved solder strip connection area of ​​the end solder strip and the empty connection area a of the adhesive module are still projected and superimposed, and the width of the adhesive module after bonding extends to both sides of the solder strip. Then the conductor adhesive is accurately covered on the corresponding grid line of the battery cell 40 to complete the electrical connection.

[0055] After the conductor adhesive is applied to the cell 40, the adhesive module is firmly bonded to the surface of the cell 40 by low-temperature heating or module lamination, while ensuring that the solder ribbon and the positive and negative grid lines form a reliable electrical connection with low contact resistance.

[0056] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for preparing a bonding module for battery strings, characterized in that, include: Cut the film strip to the predetermined length; The entire film strip is cut into an end film strip (10) comprising a plurality of independent film strips (11) spaced apart along a second direction, and a plurality of middle film strips (20) disposed on one side of the end film strip (10) along a first direction. The plurality of independent film strips (11) are provided with empty connection areas (a) spaced apart along the second direction. The plurality of middle film strips (20) are adapted to cover the positive electrode connection area and negative electrode connection area on a plurality of battery cells (40) in the battery string. The end film strip (10) is adapted to cover the positive electrode connection area or negative electrode connection area on the surface of the end battery cell in the battery string. The empty connection area (a) is adapted to the positive electrode connection area or negative electrode connection area on the surface of the end battery cell.

2. The method for preparing the adhesive module according to claim 1, characterized in that, The middle section membrane strip (20) includes a single membrane sheet or a number of independent membrane strips (11) spaced apart along the second direction or a number of independent membrane strips (11) arranged in an alternating pattern along the second direction. The single membrane sheet has multiple solder strip groups (30) on the battery cells other than the battery cells (40) at the beginning and / or the battery cells (40) at the end of the battery string. The multiple independent membrane strips (11) spaced apart cover all the solder strip groups (30) on one or more battery cells (40).

3. The method for preparing the adhesive module according to claim 2, characterized in that, When both the end membrane strip (10) and the middle membrane strip (20) are independent membrane strips (11), the following applies: The whole film strip is cut into several parallel independent long film strips along the first direction, and then the several parallel long film strips are cut vertically into several groups of independent film strips (11) along the second direction to form a middle film strip (20) and an end film strip (10). Alternatively, the entire membrane strip can be cut into individual membrane pieces along the second direction, and each individual membrane piece can be cut into several independent membrane strips (11) along the first direction to form the middle membrane strip (20) and the end membrane strip (10).

4. The method for preparing the adhesive module according to claim 1, characterized in that, After cutting the whole membrane strip into an end membrane strip (10) comprising a plurality of independent membrane strips (11) spaced apart along a second direction, and a plurality of middle membrane strips (20) disposed on one side of the end membrane strip (10) along a first direction, the method further includes: separating the adjacent ends of the end membrane strip (10) and the plurality of middle membrane strips (20) by a predetermined distance or overlapping them into a negative distance.

5. The method for preparing the adhesive module according to claim 1, characterized in that, When the number of independent membrane strips (11) in the end membrane strip (10) is N, M independent film strips (11) are transported at intervals along the second direction as end film strips (10) in the first set of adhesive modules (50), and the remaining P independent film strips (11) along the second direction are used as end film strips (10) in the second set of adhesive modules (60), where M+P=N, and M, P, and N are all positive integers; The empty area between the M independent membrane strips (11) transported at intervals is the empty connection area (a) in the end membrane strip (10) of the first set of adhesive modules (50), and the empty area between the remaining P independent membrane strips (11) is the empty connection area (a) in the end membrane strip (10) of the second set of adhesive modules (60).

6. The method for preparing the adhesive module according to claim 5, characterized in that, The process of transporting M independent membrane strips (11) at intervals also includes: transporting several intermediate membrane strips (20) as the first set of adhesive modules (50). Prepare and transport the next set of mid-section membrane strips (20) and lay them on one side of the remaining P independent membrane strips (11) as the second set of adhesive modules (60).

7. The method for preparing the adhesive module according to claim 1, characterized in that, Also includes: At least two sets of adhesive modules are prepared continuously. The end film strip (10) of one of the two sets of adhesive modules along the first direction is stacked with the empty connection area (a) of the other, so that the end film strips (10) at both ends of the two sets of adhesive modules are arranged alternately.

8. The method for preparing the adhesive module according to claim 1, characterized in that, Also includes: At least two sets of adhesive modules are continuously prepared, and several independent membrane strips (11) arranged at intervals along the second direction are prepared separately to form an intermediate membrane strip group (70). The intermediate membrane strip group (70) is overlapped with two empty connection areas (a) at the adjacent ends of the two sets of adhesive modules.

9. A device for preparing adhesive modules, characterized in that, The method for preparing the adhesive module as described in any one of claims 1 to 8 includes: A membrane roll mechanism (100) is used to provide continuous film feeding of the end membrane strip (10) and the middle membrane strip (20); A membrane head traction mechanism (200) is used to control the end of the membrane strip and pull the whole membrane strip of a predetermined length; A film carrier stage (300) is used to support the end film strip (10) and the middle film strip (20); A cutting mechanism (400) is used to cut the whole film strip into a middle film strip (20) and an end film strip (10).

10. The adhesive module preparation apparatus according to claim 9, characterized in that, The film carrier platform (300) is located below the cutting mechanism and is movably provided in at least two sets in the film belt pulling direction. Each set of film carrier platforms (300) corresponds to at least one set of middle section film belt (20) and end film belt (10).

11. The adhesive module preparation apparatus according to claim 10, characterized in that, The film carrier stage (300) includes a plurality of intermediate film carrier units (302) arranged along the film belt traction direction and end film carrier units (301) provided at one or both ends thereon. The upper surfaces of the intermediate film carrier units (302) and the end film carrier units (301) are provided with an adsorption hole array matching the width of the film belt. The adsorption hole array on the end film carrier unit (301) includes a first adsorption array and a second adsorption array arranged at intervals. The first adsorption array and the second adsorption array are connected to two independent vacuum control modules.

12. The adhesive module preparation apparatus according to claim 9, characterized in that, The cutting mechanism (400) includes a first film cutting mechanism (401) and a second film cutting mechanism (402) arranged in succession. The first film cutting mechanism (401) is used to cut the whole film strip into film strips along a first direction, and the second film cutting mechanism (402) is used to cut the whole film strip or film strip into segments along a second direction.

13. A method for preparing a battery string, characterized in that, The method for preparing the adhesive module as described in any one of claims 1 to 8 further includes: A number of battery cells (40) are arranged along the first direction, and the first and last battery cells (40) are located at the beginning and end of the battery cells (40), respectively. A plurality of end weld strips and middle weld strips are prepared, which are parallel to each other in a first direction. One end of each end weld strip extends beyond one end of each middle weld strip by a predetermined length. A weld strip connection area is reserved between the end weld strips of the predetermined length in a second direction. The end solder strips and the middle solder strips are stacked on the surface of several battery cells (40), so that the reserved solder strip connection area is connected to one of the positive or negative grid lines on the first or last battery cell (40). The end film strip (10) and the middle film strip (20) in the pasting module are respectively covered on the outside of the end welding strip and the middle welding strip and fixed to the surface of the battery cell (40). The reserved welding strip connection area is superimposed on the empty connection area (a) so that the other of the positive grid line or the negative grid line on the end battery cell is exposed.

14. The battery string preparation method according to claim 13, characterized in that, After the end film strip (10) and middle film strip (20) in the pasting module are respectively covered on the outside of the end welding strip and the middle welding strip and fixed to the surface of the battery cell (40), the method further includes: preparing a prefabricated welding strip group (30) arranged along the second direction and a prefabricated film strip group corresponding to the prefabricated welding strip group (30) one by one, and a bus bar for connecting with the prefabricated welding strip group (30). The prefabricated welding strip group (30), the prefabricated film strip group and the bus bar are transferred step by step or synchronously to the first end battery cell (40) or the last end battery cell (40) in the battery string group, so as to electrically connect the prefabricated welding strip group (30) to the exposed positive grid line or negative grid line. The prefabricated film strip group is covered and pasted on the surface of the prefabricated welding strip group (30).

15. The method for preparing a battery string according to claim 14, characterized in that, Before transferring the prefabricated strip assembly (30) and the prefabricated membrane strip assembly to the battery string assembly, the method further includes welding the busbar to the prefabricated strip to form a prefabricated conductor.

16. The method for preparing a battery string according to claim 13, characterized in that, The end solder strip and the middle solder strip are stacked with the adhesive module and hot-pressed to form a conductor adhesive. The conductor adhesive is then attached to the corresponding grid line of the battery cell (40) to complete the electrical connection.

Images