Battery string forming method and equipment

Abstract

The invention provides a battery stringing method and device, and the method comprises the steps: S1, providing a battery piece, and enabling the number of thin grid lines on the front surface of the battery piece to be smaller than the number of thin grid lines on the back surface of the battery piece; s2, applying a first glue point to each welding strip layout path on the front surface of the battery piece; s3, arranging the battery pieces with the first glue points and the welding strip groups according to a string arrangement rule, welding the welding strip groups, and bonding the welding strip groups to the corresponding battery pieces through the first glue points to obtain battery strings; and S4, respectively applying second glue points on the solder strip groups on the front surface and the back surface of the battery string so as to reinforce the connection between the solder strip groups and the battery pieces through the second glue points. As the number of the first glue points on the front surface of the cell is small and the back surface is not provided with the glue points, on one hand, the shielding area of the glue points on the conductive oxide film on the cell is greatly reduced, so that the cell and the solder strip group form better conductive contact, and on the other hand, the problem that the glue points are easy to cover the back surface fine grid lines during back surface gluing is also avoided.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cell production, and more specifically, to a method and device for stringing batteries. Background Art

[0002] For a main-gridless cell, such as Figures 1 to 2 the main-gridless heterojunction (HJT) cell 100 shown, the number of fine grid lines 101 on its front side is less than the number of fine grid lines 101 on its back side, so that the spacing between the fine grid lines 101 on the front side is greater than the spacing between the fine grid lines 101 on the back side.

[0003] The existing method for stringing main-gridless cells (which can be simply referred to as "cells") is as follows: First, a dozen or so glue dots (the glue dots have insulation properties) are applied at intervals on each solder tape laying path on the front and back sides of the cell. Then, the cell and the solder tape group are laid and stacked, and the cell and the solder tape group are welded and the glue dots are cured, so that the solder tape group is welded and adhered to the front and back sides of the cell to form a battery string.

[0004] However, since a conductive oxide film is deposited on the surface of the cell, the glue dots applied on the front and back sides of the cell are separated between the cell and the solder tape group, affecting the conductive contact between the cell and the solder tape group. And because the spacing between the fine grid lines on the back side of the cell is extremely small, the glue dots applied between two fine grid lines on the back side easily cover the fine grid lines due to their own deformation, ultimately affecting the conductive connection between the solder tape group and the fine grid lines. Summary of the Invention

[0005] In view of the above technical problems, the present application first provides a method for stringing batteries, and its detailed technical solution is as follows:

[0006] A method for stringing batteries includes:

[0007] S1. Provide a cell, on the front side of the cell, a plurality of fine grid lines extending in a second direction are arranged at intervals in a first direction, on the back side of the cell, a plurality of fine grid lines extending in the second direction are arranged at intervals in the first direction, the number of fine grid lines on the front side of the cell is less than the number of fine grid lines on the back side, and the first direction is perpendicular to the second direction;

[0008] S2. Apply first glue dots to each solder tape laying path on the front side of the cell, wherein the first glue dots are staggered from the fine grid lines on the front side of the cell, at least two ends of each solder tape laying path are respectively applied with a first glue dot, the solder tape laying path is perpendicular to the fine grid lines, and no glue dots are applied to the back side of the cell;

[0009] S3. Place the solar cell and the solder ribbon group with the first glue dots applied according to the cloth string rule, weld the solder ribbon group and bond it to the corresponding solar cell through the first glue dots to obtain a solar cell string, wherein each solder ribbon in the solder ribbon group is placed on each solder ribbon laying path on the solar cell one by one;

[0010] S4. Apply second glue dots to the solder ribbon groups on the front and back surfaces of the solar cell string respectively to reinforce the connection between the solder ribbon group and the solar cell through the second glue dots, wherein the second glue dots are applied between the fine grid lines on the front surface of the solar cell and / or between the fine grid lines on the back surface.

[0011] In the method for forming a solar cell string provided by the present application, since the number of fine grid lines on the front surface of the solar cell is less than that on the back surface, first, only a small amount of the first glue dots are applied on the front surface of the solar cell and no glue is applied on the back surface, and then the solar cell and the solder ribbon group are welded into a solar cell string. In this way, the solder ribbon group on the front surface of the solar cell string is not only connected to the solar cell by welding, but also preliminarily bonded through the first glue dots. Therefore, even if the number of fine grid lines on the front surface of the solar cell is small, the setting of the first glue dots ensures a certain connection strength between the solder ribbon group and the front surface of the solar cell, and it will not fall off easily in the subsequent processes. And since the number of fine grid lines on the back surface is large, only through welding, a certain connection strength between the solder ribbon group and the back surface of the solar cell can be ensured, and it will not fall off easily in the subsequent processes.

[0012] Since the number of the first glue dots on the front surface of the solar cell is small and no glue dots are provided on the back surface, on the one hand, the shielding area of the glue dots on the conductive oxide film on the solar cell is greatly reduced, so that the solar cell and the solder ribbon group can form better conductive contact. On the other hand, the problem that the glue dots easily cover the fine grid lines on the back surface when applying glue on the back surface is also avoided. Subsequently, second glue dots are applied to the front and back surfaces of the obtained solar cell string to reinforce the connection between the solder ribbon group and the solar cell. Since the second glue dots are applied after the solder ribbon group and the solar cell are welded, it will not affect the conductive connection between the solder ribbon group and the solar cell, and can also ensure a more stable connection between the main-gridless solar cell and the solder ribbon group, ensuring the stringing quality.

[0013] In some embodiments, in step S2, at least one first glue dot is applied to the middle of each solder ribbon laying path.

[0014] Since at least one first glue dot is applied to the middle of each solder ribbon laying path, each solder ribbon in the solder ribbon group placed on the front surface of the solar cell can be bonded to the solar cell through the first glue dots at both ends and the middle of the solder ribbon laying path, thereby further improving the bonding strength between the solder ribbon and the front surface of the solar cell.

[0015] In some embodiments, in step S3, when the first glue dot is a thermosetting glue dot, heating and curing of the first glue dot are performed during the welding process; when the first glue dot is a photosensitive glue dot, photo-curing of the first glue dot is performed before or after the welding. In step S4, when the second glue dot is a thermosetting glue dot, heating and curing of the second glue dot are performed after the application of the second glue dot; when the second glue dot is a photosensitive glue dot, photo-curing of the second glue dot is performed after the application of the second glue dot.

[0016] Using a thermosetting glue dot as the first glue dot, the curing of the first glue dot and the welding of the welding tape can both be implemented by the same heating mechanism, thereby reducing the equipment cost. In addition, through heating, the curing of the first glue dot and the welding of the welding tape can be implemented simultaneously, thereby improving the stringing efficiency. Using a photosensitive glue dot as the first glue dot, first curing the first glue dot and then welding the welding tape group to the front surface of the battery cell, or first welding the welding tape group to the front surface of the battery cell and then curing the first glue dot, can both ensure a certain connection strength between the welding tape group and the front surface of the battery cell, and prevent it from falling off easily in the subsequent processes. Among them, using the method of first curing the first glue dot and then welding the welding tape group to the front surface of the battery cell, since the welding tape group has been preliminarily bonded to the front surface of the battery cell before welding, the welding quality of the welding tape group can be improved and false soldering can be prevented.

[0017] When using a thermosetting glue dot as the second glue dot, by heating the second glue dot, the curing of the second glue dot can be accelerated and the stringing efficiency can be improved. Similarly, when using a photosensitive glue dot as the second glue dot, by irradiating the second glue dot with light, the curing of the second glue dot can be accelerated and the stringing efficiency can be improved.

[0018] In some embodiments, in step S3, the stringing rule is: the back surface of the i-th battery cell is stacked on the upper side of the rear section of the i-th welding tape group, and the front section of the (i + 1)-th welding tape group is stacked on the front surface of the i-th battery cell, where i is any natural number greater than 0.

[0019] A stringing rule is provided, which realizes the sequential stacking of the battery cells and the welding tape groups into a string, ensuring that the welding tape groups can be accurately stacked on the corresponding battery cells.

[0020] In some embodiments, in step S4, applying the second glue dots to the welding tape groups on the front and back surfaces of the battery string includes: applying the second glue dots to the welding tape groups on the front and back surfaces of the battery string simultaneously; or, including: applying the second glue dots to the welding tape groups on the front surface of the battery string; turning the battery string over; applying the second glue dots to the welding tape groups on the back surface of the battery string.

[0021] Two ways of applying the second glue dots are provided, both of which can apply the second glue dots to the solder tape groups on the front and back sides of the battery string respectively. Among them, applying the second glue dots to the solder tape groups on the front and back sides of the battery string simultaneously can achieve applying glue to the front and back sides of the battery string at the same station, thereby improving the glue application efficiency. While adopting the way of turning over for glue application, the glue application operations on the solder tape groups on the front and back sides of the battery string can be completed on the upper side of the battery string, thereby reducing the difficulty of the glue application operation. In addition, during the glue application process, the battery string can be stably supported on the carrying component (such as a conveyor line) in a horizontal state, thereby avoiding the shaking of the battery string, improving the glue application accuracy to the solder tape group, and preventing the second glue dots from being applied to the fine grids.

[0022] In some embodiments, in step S2, applying the first glue dots to the solder tape laying path on the front side of the battery cell includes: applying the first glue dots to the solder tape laying path on the front side of the battery cell by means of dispensing, printing glue, spraying glue, brushing glue and coating glue; in step S4, applying the second glue dots to the solder tape groups on the front and back sides of the battery string respectively includes: applying the second glue dots to the solder tape groups on the front and back sides of the battery string respectively by any one of the glue application methods of dispensing, printing glue, spraying glue, brushing glue and coating glue.

[0023] Several simple and easy-to-implement glue application methods are provided, all of which can ensure that the first glue dots are quickly and accurately applied to the predetermined positions on the front side of the battery cell, and the second glue dots are quickly and accurately applied to the solder tape groups on the front and back sides of the battery string, and the glue application amounts of the first glue dots and the second glue dots can be accurately controlled.

[0024] In some embodiments, the battery cell is a heterojunction battery cell, and fine main grid lines are provided at both side edges parallel to the fine grid lines on the front side of the battery cell, and the fine main grid lines are perpendicular to the fine grid lines. In step S2, the first glue dots applied at both ends of the solder tape laying path are both located on the fine main grid lines; or, harpoon lines are provided at both side edges parallel to the fine grid lines on the front side of the battery cell. In step S2, the first glue dots applied at both ends of the solder tape laying path are both located inside the harpoon lines.

[0025] Since the first glue dots applied at both ends of the solder tape laying path are located on the fine main grid lines or inside the harpoon lines, a stable conductive connection can be ensured between the welding and the solder tape bonded to the solder tape laying path through the first glue dots and the fine main grid lines or the harpoon lines. In this way, even if the first glue dots applied at both ends of the solder tape laying path overflow onto the nearby fine grids, since the nearby fine grid lines are electrically connected to the fine main grid lines or the harpoon lines, it will not affect the conductive connection between the solder tape and the nearby fine grid lines. In other words, the solder tape can be electrically connected to the nearby fine grid lines through the fine main grid lines or the harpoon lines, ensuring that the current collected by the nearby fine grid lines can also flow into the solder tape.

[0026] On the other hand, the present application also provides a battery stringing device, which includes a cell conveying mechanism, a first gluing mechanism, a solder tape placing mechanism, a cell placing mechanism, a welding conveyor line, a welding mechanism and a second gluing mechanism, wherein:

[0027] The cell conveying mechanism is configured to input cells with the front side facing up. A plurality of fine grid lines extending in the second direction are arranged at intervals along the first direction on the front side of the cell, and a plurality of fine grid lines extending in the second direction are arranged at intervals along the first direction on the back side of the cell. The number of fine grid lines on the front side of the cell is less than the number of fine grid lines on the back side, and the first direction is perpendicular to the second direction;

[0028] The first gluing mechanism is configured to apply first glue dots to the solder tape laying paths on the front side of the cells on the cell conveying mechanism. Among them, the first glue dots are staggered from the fine grid lines on the front side of the cells, and at least one first glue dot is applied to each end of each solder tape laying path, and the solder tape laying path is perpendicular to the fine grid lines;

[0029] The cell placing mechanism and the solder tape placing mechanism are configured to place the cells with the first glue dots applied on the front side and the solder tape groups on the welding conveyor line according to the stringing rules. Among them, each solder tape in the solder tape group is correspondingly placed on each solder tape laying path on the cell;

[0030] The welding conveyor line is configured to convey the placed cells and solder tape groups to the welding mechanism, and the welding mechanism is configured to weld the solder tape groups to the corresponding cells to obtain a battery string;

[0031] The second gluing mechanism is located downstream of the welding conveyor line and is configured to receive the battery string output by the welding conveyor line and apply second glue dots to the solder tape groups on the front and back sides of the battery string respectively to strengthen the connection between the solder tape groups and the corresponding cells. Among them, the second glue dots are applied between the fine grid lines on the front side of the cell and / or between the fine grid lines on the back side.

[0032] Since the number of fine grid lines on the front of the solar cell input by the solar cell conveying mechanism is less than that on the back, the first gluing mechanism can first apply a small amount of first glue dots only on the front of the solar cell, without gluing on the back. Subsequently, the solar cell placement mechanism and the solder tape placement mechanism place the solar cell with the first glue dots applied on the front and the solder tape group on the welding conveyor line according to the stringing rules. After the welding conveyor line conveys the placed solar cell and solder tape group to the welding mechanism, the welding mechanism welds the solder tape group to the corresponding solar cell to obtain a solar cell string. In this way, the solder tape group on the front of the solar cell string is not only connected to the solar cell by welding, but also preliminarily bonded through the first glue dots. Therefore, even if the number of fine grid lines on the front of the solar cell is small, the setting of the first glue dots ensures a certain connection strength between the solder tape group and the front of the solar cell, so that it will not fall off easily in the subsequent processes. Since the number of fine grid lines on the back is large, only welding can ensure a certain connection strength between the solder tape group and the back of the solar cell, so that it will not fall off easily in the subsequent processes.

[0033] Since the number of the first glue dots on the front of the solar cell is small and no glue dots are provided on the back, on the one hand, the shielding area of the glue dots on the conductive oxide film on the solar cell is greatly reduced, so that better conductive contact can be formed between the solar cell and the solder tape group. On the other hand, the problem that the glue dots easily cover the fine grid lines on the back during back gluing is also avoided. In addition, the second gluing mechanism also applies second glue dots to the front and back of the obtained solar cell string, so as to reinforce the connection between the solder tape group and the solar cell. Since the second glue dots are applied after the solder tape group and the solar cell are welded, it will not affect the conductive connection between the solder tape group and the solar cell, and can also ensure a more stable connection between the main-gridless solar cell and the solder tape group, ensuring the stringing quality.

[0034] In some embodiments, the first glue dots are heat-curing glue, and the welding mechanism is further configured to cure the first glue dots to bond the solder tape group to the corresponding solar cell; or, the first glue dots are UV-curing glue, and the solar cell stringing device further includes a glue dot curing mechanism, which is located above the welding conveyor line and in front of the welding mechanism, or between the welding mechanism and the second gluing mechanism; the glue dot curing mechanism is configured to cure the first glue dots on the front of the solar cell, so that the solder tape group is bonded to the front of the solar cell; the glue dot curing mechanism is a UV light source.

[0035] When using heat-curing glue dots as the first glue dots, in addition to heating the solder tape group so that the solder tape group is welded to the solar cell, the welding mechanism can also realize the heating and curing of the first glue dots. That is, the present application does not need to additionally set a glue dot curing mechanism to heat and cure the first glue dots, thereby reducing the equipment cost. In addition, the welding mechanism can synchronously implement the welding of the solder tape and the heating and curing of the first glue dots, thereby improving the stringing efficiency.

[0036] When using a UV-curing glue dot as the first glue dot, by arranging the glue dot curing mechanism in front of the welding mechanism, the glue dot curing mechanism first cures the first glue dot, thereby preliminarily bonding the solder ribbon group to the front side of the battery cell. Subsequently, the welding mechanism welds the solder ribbon group to the front side of the battery cell, ultimately ensuring a certain connection strength between the solder ribbon group and the front side of the battery cell. In addition, since the solder ribbon group has been preliminarily bonded to the front side of the battery cell before welding, the welding quality of the welding mechanism for the solder ribbon group can be improved, preventing false soldering. By arranging the glue dot curing mechanism between the welding mechanism and the second glue application mechanism, after the solder ribbon group is welded to the front side of the battery cell, the solder ribbon group can be preliminarily bonded to the front side of the battery cell, thereby ensuring a certain connection strength between the solder ribbon group and the front side of the battery cell.

[0037] In some embodiments, the second glue application mechanism includes a conveyor line, a first glue application part, a flipping part, and a second glue application part, where: the conveyor line is close to the output end of the welding conveyor line, and is configured to receive the battery string output by the welding conveyor line, and sequentially convey the battery string to the first glue application station, the flipping station, and the second glue application station; the first glue application part is arranged at the first glue application station and is configured to apply a second glue dot to the solder ribbon group on the front side of the battery string; the flipping part is arranged at the flipping station and is configured to pick up the battery string that has completed front-side glue application from the conveyor line, and after flipping the battery string, place the battery string back on the conveyor line; the second glue application part is arranged at the second glue application station and is configured to apply a second glue dot to the solder ribbon group on the back side of the battery string.

[0038] The completed welded battery string output by the welding conveyor line directly transitions to the conveyor line. Therefore, there is no need to carry the battery string, thereby reducing the risk of damage to the battery string. After the solder ribbon group on the front side of the battery string is glued at the first glue application station, the conveyor line conveys the battery string to the flipping station. The flipping part flips the battery string and places the flipped battery string on the conveyor line. The conveyor line continues to convey the battery string to the second glue application station, and the solder ribbon group on the back side of the battery string is glued at the second glue application station.

[0039] It can be seen that the glue application process for the solder ribbon groups on the front and back sides of the battery string is completed on the conveyor line. In this way, the battery string can be supported by the conveyor line during the glue application process, maintaining a stable horizontal state, thereby avoiding the shaking of the battery string during the glue application process, improving the glue application accuracy for the solder ribbon group, and preventing the second glue dot from being applied to the fine grid lines.

[0040] In some embodiments, a first curing station located between the first glue application station and the second glue application station, and a second curing station located downstream of the second glue application station are further provided on the conveying path of the conveying line; the second glue application mechanism further includes a first curing part and a second curing part, wherein: the first curing part is arranged at the first curing station and is configured to cure the second glue dots applied to the solder ribbon group on the front side of the battery string; the second curing part is arranged at the second curing station and is configured to cure the second glue dots applied to the solder ribbon group on the back side of the battery string.

[0041] By providing a first curing station between the first glue application station and the second glue application station and correspondingly arranging a first curing part at the first curing station, rapid curing of the second glue dots applied to the solder ribbon group on the front side of the battery string can be implemented, thereby improving the stringing efficiency and preventing the second glue dots from adhering to the turning part or the conveying line. By providing a second curing station downstream of the second glue application station and correspondingly arranging a second curing part at the second curing station, rapid curing of the second glue dots applied to the solder ribbon group on the back side of the battery string can be implemented, thereby improving the stringing efficiency.

[0042] In some embodiments, the conveying line includes a first conveying section and a second conveying section located downstream of the first conveying section; the first glue application station is arranged on the conveying path of the first conveying section, the second glue application station is arranged on the conveying path of the second conveying section, and the turning station is located between the first conveying section and the second conveying section; the turning part is configured to pick up the battery string that has completed front-side glue application from the first conveying section and, after turning the battery string, transport the battery string to the second conveying section.

[0043] The conveying line is set to a segmented structure composed of a first conveying section and a second conveying section, and the first glue application station and the second glue application station are respectively arranged on the first conveying section and the second conveying section. In this way, the glue application to the solder ribbon group on the front side of the battery cell and the glue application to the solder ribbon group on the back side of the battery cell are respectively completed on the first conveying section and the second conveying section, which are independent of each other and do not interfere with each other. In this way, it can be realized that when one string of battery strings is receiving front-side glue application on the first conveying section, another string of battery strings is receiving back-side glue application on the second conveying section.

[0044] In some embodiments, the battery stringing device further includes a string splitting mechanism; the string splitting mechanism is located between the output end of the welding conveying line and the second glue application mechanism, or the string splitting mechanism is located between the first curing part and the turning part; the string splitting mechanism is configured to split the overall battery string into multiple independent segmented battery strings.

[0045] By providing the string splitting mechanism, the splitting of the welded overall battery string is realized, thereby obtaining segmented battery strings with a predetermined length that meet industrial requirements.

[0046] In some embodiments, the battery stringing device further includes a jig conveying mechanism and a jig removing mechanism. The jig conveying mechanism is arranged in parallel with the welding conveying line and has an opposite conveying direction; the battery sheet placing mechanism is further configured to pick up a jig from the jig conveying mechanism and place the jig on the battery sheet with a solder tape group placed thereon on the welding conveying line, so as to press the solder tape group onto the battery sheet; the jig removing mechanism is located downstream of the welding mechanism and is configured to remove the jig from the battery sheet and place it back on the jig conveying mechanism.

[0047] By providing the jig conveying mechanism, the cyclic conveyance of the jigs is realized, enabling the battery sheet placing mechanism to pick up a jig nearby from the jig conveying mechanism and place the jig on the battery sheet with a solder tape group placed thereon on the welding conveying line, so as to press the solder tape group onto the battery sheet, prevent the solder tape group from shifting, and ultimately ensure that the solder tapes in the solder tape group are accurately welded to the corresponding solder tape laying paths.

[0048] By providing the jig removing mechanism downstream of the welding mechanism, after the solder of the solder tape solidifies, the jig can be automatically removed from the battery sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic front view of a main-grid-free heterojunction battery sheet;

[0050] Figure 2 It is a schematic back view of a main-grid-free heterojunction battery sheet;

[0051] Figure 3 It is a schematic diagram showing the execution process of the battery stringing method in an embodiment of the present application;

[0052] Figure 4 It is a schematic diagram showing the state of a solder tape group preliminarily bonded to the front side of a battery sheet through a first glue dot in an embodiment of the present application;

[0053] Figure 5 It is a schematic diagram showing the state of a solder tape group preliminarily bonded to the front side of a battery sheet through a first glue dot in another embodiment of the present application;

[0054] Figure 6 It is a schematic front view of a battery string after welding and stringing;

[0055] Figure 7 For Figure 6 A partial enlarged view of the A area in

[0056] Figure 8 It is a side view of a partial section of the battery string after completing welding and stringing;

[0057] Figure 9 For Figure 8 A partial enlarged view of the B area in

[0058] Figure 10 Front schematic view of the battery string after the second glue dot application;

[0059] Figure 11 is Figure 10 Partial enlarged view of area C in

[0060] Figure 12 Back schematic view of the battery string after the second glue dot application;

[0061] Figure 13 is Figure 12 Partial enlarged view of area D in

[0062] Figure 14 Side view of a partial section of the battery string after the second glue dot application;

[0063] Figure 15 is Figure 14 Partial enlarged view of area E in

[0064] Figure 16 Schematic structural view of the battery stringing device in the embodiment of the present application.

[0065] Figures 1 to 16 includes:

[0066] Solar cell 100, fine grid line 101, fine main grid line 102, harpoon line 103;

[0067] Solder ribbon group 200;

[0068] First glue dot 300;

[0069] Second glue dot 400;

[0070] Solar cell conveying mechanism 1, first glue application mechanism 2, solder ribbon laying mechanism 3, solar cell laying mechanism 4, welding conveying line 5, welding mechanism 6, glue dot curing mechanism 7, second glue application mechanism 8, first conveying section 81, second conveying section 82, first glue application part 83, second glue application part 84, stringing mechanism 9, fixture conveying mechanism 10, fixture removing mechanism 11. Detailed implementation manners

[0071] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0072] As described in the background art section, the existing method for stringing masterless grid cell strings is as follows: First, a dozen or so glue dots are applied at intervals on each solder ribbon laying path on the front and back sides of the cell. Then, the cells and the solder ribbon group are laid and stacked, and the cells and the solder ribbon group are welded and the glue dots are cured, so that the solder ribbon group is welded and adhered to the front and back sides of the cells, forming a cell string.

[0073] Since a conductive oxide film is deposited on the surface of the cell, the glue dots applied on the front and back sides of the cell are separated between the cell and the solder ribbon group, affecting the conductive contact between the cell and the solder ribbon. Moreover, due to the extremely small spacing of the fine grid lines on the back side of the cell, the glue dots applied between two adjacent fine grid lines on the back side are likely to cover the fine grid lines due to their own deformation, ultimately affecting the conductive connection between the solder ribbon group and the fine grid lines.

[0074] The number and spacing of the solder ribbon laying paths match the number and spacing of the solder ribbons in the solder ribbon group to be laid, so as to ensure that each solder ribbon in the solder ribbon group is evenly placed on the corresponding solder ribbon laying path. Finally, when the solder ribbon group is laid and welded along the solder ribbon laying path, each solder ribbon in the solder ribbon group forms a conductive connection with all the fine grid lines on the front and / or back sides of the cell.

[0075] To solve the above technical problems existing in the existing cell stringing method, the present application provides a cell stringing method.

[0076] With reference to Figures 1 to 15 shown, the cell stringing method in the embodiments of the present application includes the following steps:

[0077] S1. As Figure 1 and Figure 2 shown, provide a cell 100. A plurality of fine grid lines 101 extending in a second direction (such as the Y direction) are arranged at intervals on the front side of the cell 100 in a first direction (such as the X direction); a plurality of fine grid lines 101 extending in the second direction are arranged at intervals on the back side of the cell 100 in the first direction. The number of fine grid lines 101 on the front side of the cell 100 is less than the number of fine grid lines 101 on the back side, and the first direction is perpendicular to the second direction.

[0078] S2. As Figure 4 and Figure 5 shown, apply first glue dots 300 to each solder ribbon laying path L on the front side of the cell 100, wherein the first glue dots 300 are staggered from the fine grid lines 101 on the front side of the cell 100. At least two ends of each solder ribbon laying path L are respectively applied with a first glue dot 300. The solder ribbon laying path L is perpendicular to the fine grid lines 101, and no glue dots are applied to the back side of the cell 100.

[0079] S3. As Figures 6 to 9As shown, the solar cells 100 with the first adhesive dots 300 applied are arranged and the solder ribbon groups 200 are arranged according to the string layout rule. The solder ribbon groups 200 are welded and adhered to the corresponding solar cells 100 through the first adhesive dots 300 to obtain a solar cell string, wherein each solder ribbon in the solder ribbon groups 200 is arranged one by one on each solder ribbon layout path L on the solar cells 100.

[0080] S4. As Figures 10 to 15 shown, the second adhesive dots 400 are respectively applied to the solder ribbon groups 200 on the front and back surfaces of the solar cell string to reinforce the connection between the solder ribbon groups 200 and the solar cells 100 through the second adhesive dots 400, wherein the second adhesive dots 400 are applied between the fine grid lines 101 on the front surface of the solar cells 100 and / or between the fine grid lines 101 on the back surface.

[0081] In step S1, the solder ribbon layout path L is only a reference layout line for arranging the solder ribbon groups 200, and it is not necessary to actually mark and prepare the solder ribbon layout path L on the front and back surfaces of the solar cells 100 in actual production. For the sake of simplicity in illustration, Figures 4 to 5 only one solder ribbon layout path L is schematically shown.

[0082] In step S2, the purpose of staggering the first adhesive dots 300 from the fine grid lines 101 on the front surface of the solar cells 100 is to avoid the first adhesive dots 300 covering the nearby fine grid lines 101, resulting in the inability to form an electrical connection between the solder ribbons welded on this solder ribbon layout path L and the fine grid lines 101 near the first adhesive dots 300. The first adhesive dots 300 applied to both ends of the solder ribbon layout path L can be located between two adjacent fine grid lines 101 or outside the fine grid lines 101 at the outermost edge on the front surface of the solar cells 100, both of which can make the first adhesive dots 300 staggered from the fine grid lines 101. During the actual glue application process, the glue application amount of the first adhesive dots 300 can be reasonably set according to the actual spacing between the fine grid lines 101 on the front surface of the solar cells 100, so as to avoid the first adhesive dots 300 overflowing to the nearby fine grid lines 101 after being pressed while ensuring that the first adhesive dots 300 can initially bond the solder ribbons to the front surface of the solar cells 100.

[0083] In step S3, the solder ribbon groups required for stringing the solar cells include three types, namely the head solder ribbon group, the intermediate welding group, and the tail solder ribbon group. The head solder ribbon group is only arranged on the back surface of the head solar cell (such as the solar cell 100 at the right end), the tail solder ribbon group is only arranged on the front surface of the tail solar cell (such as the solar cell 100 at the left end), the front section of the intermediate welding group is arranged on the front surface of the solar cell 100 at the front side among two adjacent solar cells 100, and the rear section of the intermediate welding group is arranged on the back surface of the solar cell 100 at the rear side among two adjacent solar cells 100.

[0084] The first adhesive dots 300 can be thermosetting adhesive dots or photosensitive adhesive dots. When the first adhesive dots 300 are thermosetting adhesive dots, they remain viscous at ambient temperature and can be cured after being heated, thereby bonding the solder ribbon group 200 to the solar cell 100. When the first adhesive dots 300 are photosensitive adhesive dots, they remain viscous when not irradiated by UV light and are cured when irradiated by UV light, thereby bonding the solder ribbon group 200 to the solar cell 100.

[0085] In step S4, when applying the second adhesive dots 400 to the head solder ribbon group, it is only necessary to apply the second adhesive dots 400 between the fine grid lines 101 on the back surface of the solar cell 100. When applying the second adhesive dots 400 to the tail solder ribbon group, it is only necessary to apply the second adhesive dots 400 between the fine grid lines 101 on the front surface of the solar cell 100. When applying the second adhesive dots 400 to the middle solder ribbon group, the second adhesive dots 300 need to be applied between the fine grid lines 101 on the front surface of the front-side solar cell 100 among two adjacent solar cells 100, and between the fine grid lines 101 on the back surface of the back-side solar cell 100 among two adjacent solar cells 100. Optionally, the application amount of the second adhesive dots 400 applied to the solder ribbon is sufficient to cover the solder ribbon at the application position (the part where the solder ribbon contacts the solar cell does not need to be covered), so as to ensure that the solder ribbon can be bonded and reinforced to the solar cell 100.

[0086] In the method for forming a battery string provided by the embodiment of the present application, since the number of fine grid lines 101 on the front surface of the solar cell 100 is less than the number of fine grid lines 101 on the back surface, by first applying only a small amount of the first adhesive dots 300 on the front surface of the solar cell 100 and not applying glue on the back surface, and then welding the solar cell 100 and the solder ribbon group 200 into a battery string. In this way, the solder ribbon group 200 on the front surface of the battery string and the solar cell 100 are not only connected by welding, but also preliminarily bonded through the first adhesive dots 300. Therefore, even if the number of fine grid lines 101 on the front surface of the solar cell 100 is small, the setting of the first adhesive dots 300 ensures a certain connection strength between the solder ribbon group 200 and the front surface of the solar cell 100, and it will not fall off easily in the subsequent processes. And since the number of fine grid lines on the back surface is large, only through welding, it can ensure a certain connection strength between the solder ribbon group 200 and the back surface of the solar cell 100, and it will not fall off easily in the subsequent processes.

[0087] Since the number of the first adhesive dots 300 on the front side of the battery cell 100 is small and no adhesive dots are provided on the back side, on the one hand, the shielding area of the adhesive dots on the conductive oxide film on the battery cell 100 is greatly reduced, enabling better conductive contact between the battery cell 100 and the solder ribbon group 200. On the other hand, the problem that the adhesive dots easily cover the fine grid lines on the back side during back-side gluing is avoided. Subsequently, second adhesive dots 400 are applied to the front and back sides of the obtained battery string to reinforce the connection between the solder ribbon group 200 and the battery cell 100. Since the second adhesive dots 400 are applied after the solder ribbon group 200 is welded to the battery cell 100, the conductive connection between the solder ribbon group 200 and the battery cell 100 is not affected, and a more stable connection between the battery cell 100 and the solder ribbon group 200 can be ensured, guaranteeing the quality of the stringing.

[0088] As Figure 4 and Figure 5 In the embodiments shown, only one first adhesive dot 300 is provided at each of the two end positions of each solder ribbon laying path L. In this way, each solder ribbon placed on the front side of the battery cell 100 in the solder ribbon group 200 is bonded to the front side of the battery cell through the first adhesive dots 300 at both ends of the corresponding solder ribbon laying path L.

[0089] In some other alternative embodiments, in step S2, at least one first adhesive dot 300 is applied to the middle of each solder ribbon laying path L. In this way, each solder ribbon placed on the front side of the battery cell 100 in the solder ribbon group 200 can be bonded to the front side of the battery cell 100 through the first adhesive dots 300 at both ends and in the middle of the solder ribbon laying path L, thereby enhancing the bonding strength between the solder ribbon and the front side of the battery cell 100. Of course, the first adhesive dots 300 applied to the middle of each solder ribbon laying path L need to be located between two adjacent fine grid lines 101 to stagger the fine grid lines 101 and avoid the first adhesive dots 300 covering the nearby fine grid lines 101.

[0090] Optionally, in step S3, when the first adhesive dot 300 is a thermosetting adhesive dot, the heating and curing of the first adhesive dot 300 are carried out during the welding process. When the first adhesive dot 300 is a photosensitive adhesive dot, the photo-curing of the first adhesive dot 300 is carried out before or after the welding.

[0091] When using a thermosetting adhesive dot as the first adhesive dot 300, the curing of the first adhesive dot 300 and the welding of the solder ribbon group 200 in step S3 can be carried out by the same heating mechanism, thereby reducing the equipment cost. In addition, the curing of the first adhesive dot 300 and the welding of the solder ribbon group 200 can be carried out simultaneously by heating, thereby improving the stringing efficiency.

[0092] When using a photosensitive adhesive dot as the first adhesive dot 300, first curing the first adhesive dot 300 and then welding the solder ribbon group 200 to the front side of the solar cell 100, or first welding the solder ribbon group 200 to the front side of the solar cell 100 and then curing the first adhesive dot 300, can ensure a certain connection strength between the solder ribbon group 200 and the front side of the solar cell 100, and prevent it from falling off easily in the subsequent processes. Among them, when using the method of first curing the first adhesive dot 300 and then welding the solder ribbon group 200 to the front side of the solar cell 100, since the solder ribbon group 200 has been preliminarily bonded and positioned on the solder ribbon layout path L on the front side of the solar cell 100 before welding, the welding quality of the solder ribbon group 200 can be improved and false soldering can be prevented.

[0093] Optionally, in step S4, when the second adhesive dot 400 is a thermosetting adhesive dot, heat curing is performed on the second adhesive dot 400 after the application of the second adhesive dot 400 is completed. When the second adhesive dot 400 is a photosensitive adhesive dot, light curing is performed on the second adhesive dot 400 after the application of the second adhesive dot 400 is completed.

[0094] Using a thermosetting adhesive dot as the second adhesive dot 400 can accelerate the curing of the second adhesive dot 400 and improve the stringing efficiency by heating the second adhesive dot 400. Similarly, using a photosensitive adhesive dot as the second adhesive dot 400 can accelerate the curing of the second adhesive dot 400 and improve the stringing efficiency by irradiating the second adhesive dot 400 with light.

[0095] Optionally, in step S3, the stringing rule is: the back side of the i-th solar cell is stacked on the upper side of the rear section of the i-th solder ribbon group, and the front section of the (i + 1)-th solder ribbon group is stacked on the front side of the i-th solar cell, where i is any natural number greater than 0.

[0096] For example, taking the total number of solar cells to be strung as 4 (of course, the number of solar cells included in an actual solar cell string is generally greater than 4) as an example, the optional stringing process is as follows:

[0097] The stringing direction is carried out from right to left in sequence.

[0098] The back side of the 1st solar cell (the head solar cell) is stacked on the upper side of the rear section of the 1st solder ribbon group (the head solder ribbon group), and the front section of the 2nd solder ribbon group is stacked on the front side of the 1st solar cell.

[0099] The back side of the 2nd solar cell is stacked on the upper side of the rear section of the 2nd solder ribbon group, and the front section of the 3rd solder ribbon group is stacked on the front side of the 2nd solar cell.

[0100] The back side of the 3rd solar cell is stacked on the upper side of the rear section of the 3rd solder ribbon group, and the front section of the 4th solder ribbon group is stacked on the front side of the 3rd solar cell.

[0101] The back side of the 4th cell (the tail cell) is stacked on the upper side of the rear section of the 4th solder ribbon group, and the front section of the 5th solder ribbon group (the tail solder ribbon group) is stacked on the front side of the 4th cell. Thus, the placement of the solder ribbon groups and cells into a string is completed.

[0102] After completing the stringing of the cells and solder ribbon groups according to the above stringing rules, it can be made that: the head solder ribbon group is placed on the back side of the head cell, the tail solder ribbon group is placed on the front side of the tail cell, the front section of each intermediate welding group is placed on the front side of the front cell among two adjacent cells, and the rear section is placed on the back side of the rear cell among two adjacent cells.

[0103] In an alternative embodiment, in step S4, applying the second glue dots 400 to the solder ribbon groups 200 on the front and back sides of the cell string respectively includes: simultaneously applying the second glue dots 400 to the solder ribbon groups 200 on the front and back sides of the cell string. In another alternative embodiment, in step S4, the process of applying the second glue dots 400 to the solder ribbon groups 200 on the front and back sides of the cell string is: first applying the second glue dots 400 to the solder ribbon groups 200 on the front side of the cell string, then turning over the cell string, and then applying the second glue dots 400 to the solder ribbon groups 200 on the back side of the cell string.

[0104] Both of the above glue application methods can apply the second glue dots 400 to the solder ribbon groups 200 on the front and back sides of the cell string respectively. Among them, simultaneously applying the second glue dots to the solder ribbon groups 200 on the front and back sides of the cell string can achieve synchronous glue application to the front and back sides of the cell string at the same station, thereby improving the glue application efficiency. And adopting the method of turning over for glue application can achieve that the glue application operations on the solder ribbon groups on the front and back sides of the cell string are all completed on the upper side of the cell string, thereby reducing the difficulty of the glue application operation. In addition, during the glue application process, the cell string can be stably supported on the carrying component (such as a conveyor line) in a horizontal state, thereby avoiding the shaking of the cell string, improving the glue application accuracy to the solder ribbon group, and avoiding applying the second glue dots 400 to the fine grid lines 101.

[0105] In the specific production process, an appropriate glue application method can be selected according to the actual situation to complete the application of the second glue dots 400.

[0106] Optionally, in step S2, applying the first glue dots 300 to the solder ribbon laying path L on the front side of the cell 100 includes: applying the first glue dots to the solder ribbon laying path L on the front side of the cell 100 by means of dotting, printing, spraying, brushing, and coating.

[0107] Similarly, optionally, in step S4, applying the second glue dots 400 to the solder ribbon groups 200 on the front and back of the battery string respectively includes: applying the second glue dots 400 to the solder ribbon groups 200 on the front and back of the battery string respectively by any one of the glue application methods such as dot gluing, screen printing, spraying, brushing, and coating.

[0108] For example, dot gluing can be implemented through a glue dotting head, screen printing can be implemented through a screen printing stencil, spraying can be implemented through a spray head, brushing can be implemented through a brush, and coating can be implemented through a coating pen. The above various glue application methods can all quickly apply the first glue dots 300 to the predetermined positions on the front of the battery cell, and quickly and accurately apply the second glue dots 400 to the solder ribbon groups 200 on the front and back of the battery string, and can accurately control the amount of glue applied to the first glue dots 300 and the second glue dots 400.

[0109] Optionally, the battery string forming method of the present application forms the battery cells 100 into a string as non-main grid heterojunction battery cells, such as Figure 4 and Figure 5 As shown, for this type of battery cell 100, there are generally thin main grid lines 102 or harpoon lines 103 at both side edges parallel to the fine grid lines 101 on the front, and the thin main grid lines 102 or harpoon lines 103 intersect and conduct with one or more fine grid lines 101 near the both side edges of the front of the battery cell 100.

[0110] As Figure 4 shown, for the case where there are thin main grid lines 102 at both side edges parallel to the fine grid lines 101 on the front of the battery cell 100, the thin main grid lines 102 are perpendicular to the fine grid lines 101. In step S2, the first glue dots 300 applied at both ends of the solder ribbon layout path L are both located on the thin main grid lines 102.

[0111] With such a setting, it can be ensured that a stable conductive connection can be formed between the solder ribbon bonded to the solder ribbon layout path L through welding and the thin main grid line 102 by the first glue dots 300. At this time, even if the first glue dots 300 applied at both ends of the solder ribbon layout path L overflow onto the nearby fine grid lines 101, since the nearby fine grid lines 101 are conductive with the thin main grid line 102, it will not affect the conductive connection between the solder ribbon and the nearby fine grid lines 101. In other words, the solder ribbon can be conducted with the nearby fine grid lines 101 through the thin main grid line 102, ensuring that the current collected by the nearby fine grid lines 101 can also flow into the solder ribbon.

[0112] As Figure 5 shown, for the case where there are harpoon lines 103 at both side edges parallel to the fine grid lines 101 on the front of the battery cell 100, in step S2, the first glue dots 300 applied at both ends of the solder ribbon layout path L are both located inside the harpoon lines 103.

[0113] Similarly, with such a setting, it can ensure that a stable conductive connection is formed between the solder tape bonded to the solder tape laying path L through welding and the harpoon line 103. At this time, even if the first adhesive dots 300 applied at both ends of the solder tape laying path L overflow onto the nearby fine grid lines 101, since the nearby fine grid lines 101 are electrically connected to the harpoon line 103, it will not affect the conductive connection between the solder tape and the nearby fine grid lines 101. In other words, the solder tape can be electrically connected to the nearby fine grid lines 101 through the harpoon line 103, ensuring that the current collected by the nearby fine grid lines 101 can also flow into the solder tape.

[0114] Based on the same inventive concept, the present application also provides a battery stringing device. This battery stringing device can be applied to the battery stringing method in the above embodiments.

[0115] As Figure 16 shown, the battery stringing device in the embodiment of the present application includes a battery cell conveying mechanism 1, a first glue applying mechanism 2, a solder tape laying mechanism 3, a battery cell laying mechanism 4, a welding conveyor line 5, a welding mechanism 6, and a second glue applying mechanism 8, where:

[0116] The battery cell conveying mechanism 1 is configured to input battery cells 100 with the front side facing up. As Figure 1 and Figure 2 shown, a plurality of fine grid lines 101 extending in the second direction (such as the Y direction) are arranged at intervals along the first direction (such as the X direction) on the front side of the battery cell 100, and a plurality of fine grid lines 101 extending in the second direction are arranged at intervals along the first direction on the back side of the battery cell 100. The number of fine grid lines 101 on the front side of the battery cell 100 is less than the number of fine grid lines 101 on the back side, and the first direction is perpendicular to the second direction.

[0117] The first glue applying mechanism 2 is configured to apply the first adhesive dots 300 to the solder tape laying path L on the front side of the battery cell 100 on the battery cell conveying mechanism 1. Among them, the first adhesive dots 300 are staggered from the fine grid lines 101 on the front side of the battery cell 100, and at least one first adhesive dot 300 is applied to each end of each solder tape laying path L. The solder tape laying path L is perpendicular to the fine grid lines 101.

[0118] The battery cell laying mechanism 4 and the solder tape laying mechanism 3 are configured to lay the battery cell 100 with the first adhesive dots 300 applied to the front side and the solder tape group 200 on the welding conveyor line 5 according to the stringing rules, where each solder tape in the solder tape group 200 is correspondingly laid on each solder tape laying path L on the battery cell 100.

[0119] The welding conveyor line 5 is configured to convey the laid battery cells 100 and the solder tape group 200 to the welding mechanism 6, and the welding mechanism 6 is configured to weld the solder tape group 200 to the corresponding battery cells 100 to obtain a battery string.

[0120] The second sizing mechanism 8 is located after the welding conveyor line 5 and is configured to receive the battery string output by the welding conveyor line 5 and apply second glue dots 400 to the solder ribbon groups 200 on the front and back surfaces of the battery string respectively to reinforce the connection between the solder ribbon groups 200 and the corresponding battery cells 100. Among them, the second glue dots 400 are applied between the fine grid lines 101 on the front surface of the battery cell 100 and / or between the fine grid lines 101 on the back surface.

[0121] With reference to Figures 4 to 15 , the optional working process of the battery stringing device in the embodiment of the present application is as follows;

[0122] The battery cell conveying mechanism 1 inputs the battery cells 100 with the front side facing up, so that the battery cells 100 pass under the first sizing mechanism 2 in sequence. The first sizing mechanism 2 applies the first glue dots 300 to the solder ribbon laying path L on the front surface of the battery cell 100. As Figures 4 to 5 shown, optionally, one first glue dot 300 is applied to each end of each solder ribbon laying path L. Of course, in order to improve the bonding strength of the first glue dot 300 to the solder ribbon, at least one first glue dot 300 can also be applied to the middle of each solder ribbon laying path L.

[0123] The battery cell placing mechanism 4 picks up the battery cell 100 with the first glue dots 300 applied from the battery cell conveying mechanism 1, and the solder ribbon placing mechanism 3 pulls the solder ribbon group 200 towards the welding conveyor line 5. The battery cell placing mechanism 4 and the solder ribbon placing mechanism 3 cooperate to place the battery cell 100 and the solder ribbon group 200 on the welding conveyor line 5 according to the stringing rules. Among them, each solder ribbon in the solder ribbon group 200 is placed on each solder ribbon laying path L on the corresponding battery cell 100 one by one. Optionally, the stringing rule is: the back surface of the i-th battery cell 100 is stacked on the upper side of the rear section of the i-th solder ribbon group 200, and the front section of the (i + 1)-th solder ribbon group 200 is stacked on the front surface of the i-th battery cell 100, where i is any natural number greater than 0.

[0124] The welding conveyor line 5 conveys the placed battery cells 100 and solder ribbon groups 200 to the welding mechanism 6, and the welding mechanism 6 welds the solder ribbon groups 200 to the corresponding battery cells 100, thereby obtaining a battery string as Figures 6 to 9 shown.

[0125] The welding mechanism 6 conveys the welded battery string to the second sizing mechanism 8, and the second sizing mechanism 8 applies second glue dots 400 to the solder ribbon groups 200 on the front and back surfaces of the battery string respectively to reinforce the connection between the solder ribbon groups 200 and the corresponding battery cells 100. The battery string after the application of the second glue dots 400 is as Figures 10 to 15 shown.

[0126] It can be seen that when using the battery stringing device in the embodiments of the present application to string batteries, the solder ribbon group 200 on the front of the battery string is not only connected to the battery cell 100 by welding, but also preliminarily bonded through the first glue dots 300. Thus, even if the number of fine grid lines 101 on the front of the battery cell 100 is small, the setting of the first glue dots 300 ensures a certain connection strength between the solder ribbon group 200 and the front of the battery cell 100, and it will not easily fall off in the subsequent processes. And the number of fine grid lines 101 on the back of the battery cell 100 is large, so only through welding can a certain connection strength between the solder ribbon group 200 and the back of the battery cell 100 be ensured, and it will not easily fall off in the subsequent processes.

[0127] Since the number of the first glue dots 300 on the front of the battery cell 100 is small and no glue dots are provided on the back, on the one hand, the shielding area of the glue dots on the conductive oxide film on the battery cell 100 is greatly reduced, enabling better conductive contact between the battery cell and the solder ribbon group 200. On the other hand, the problem that the glue dots easily cover the fine grid lines on the back during glue application on the back is also avoided.

[0128] The battery cell conveying mechanism 1 in the embodiments of the present application can adopt various existing conveying mechanisms capable of conveying the battery cell 100. For example, the battery cell conveying mechanism 1 includes two parallel conveyor belts, and both ends of the battery cell 100 are respectively supported on one conveyor belt.

[0129] The first glue application mechanism 2 in the embodiments of the present application can apply the first glue dots 300 to the front of the battery string by any one of the glue application methods such as dotting, screen printing, spraying, brushing, and coating. Correspondingly, the first glue application mechanism 2 can be various existing glue application mechanisms capable of applying the first glue dots 300 to the front of the battery cell, such as a dispensing head, a screen printing machine, a nozzle, a brush, a coating pen, etc. Using the above glue application mechanisms as the first glue application mechanism 2 can ensure that the first glue dots 300 are quickly and accurately applied to the predetermined position on the front of the battery cell, and the glue application amount of the first glue dots can be accurately controlled.

[0130] The battery cell placement mechanism 4 in the embodiments of the present application can adopt various existing mechanisms capable of adsorbing and transporting the battery cell 100. For example, the battery cell placement mechanism 4 includes a first driving component and a battery cell suction component (such as a suction cup component) connected to the driving end of the first driving component. The first driving component drives the battery cell suction component to move and switch between the battery cell conveying mechanism 1 and the welding conveying line 5, so that the battery cell suction component sucks the battery cell 100 with the first glue dots 300 applied from the battery cell conveying mechanism 1 and places the sucked battery cell 100 on the welding conveying line 5.

[0131] In the embodiment of the present application, the solder tape placing mechanism 3 can adopt various existing mechanisms capable of pulling and placing the solder tape group 200. For example, the solder tape placing mechanism 3 includes a second driving assembly and a solder tape clamping assembly connected to the driving end of the second driving assembly. The second driving assembly drives the solder tape clamping assembly to move and switch between the solder tape feeding device and the welding conveyor line 5, so that the solder tape clamping assembly clamps the solder tape group 200 from the solder tape feeding device and places the clamped solder tape group 200 on the welding conveyor line 5.

[0132] In the embodiment of the present application, the welding mechanism 6 can adopt various existing mechanisms capable of heating the solder tape group 200 so that the solder on the solder tape group 200 melts and is welded to the battery cell. For example, the welding mechanism 6 can be a heating lamp box or a laser welding device, etc.

[0133] In some embodiments, the first glue dots 300 applied to the front surface of the battery cell 100 by the first glue applying mechanism 2 are thermosetting glue. The thermosetting glue remains viscous at ambient temperature and can be cured after being heated, thereby bonding the solder tape group 200 to the front surface of the battery cell 100.

[0134] For the case where the first glue dots 300 are thermosetting glue dots. Optionally, the welding mechanism 6 is further configured to cure the first glue dots 300 to bond the solder tape group 200 to the front surface of the corresponding battery cell 100. That is to say, when the first glue dots 300 are thermosetting glue, in addition to heating the solder tape group 200 so that the solder on the solder tape group 200 melts and is welded to the front surface of the battery cell 100, the welding mechanism 6 can also heat and cure the first glue dots 300. In this way, the battery stringing device in the embodiment of the present application does not need to additionally set a glue dot curing mechanism to heat and cure the first glue dots 300, thereby reducing the equipment cost. In addition, the welding mechanism 6 can simultaneously heat and cure the first glue dots 300 and weld the solder tape group 200, thereby improving the battery stringing efficiency.

[0135] In other embodiments, the first glue dots 300 applied to the front surface of the battery cell 100 by the first glue applying mechanism 2 are photosensitive glue dots. The photosensitive glue dots remain viscous when not irradiated by UV light and are cured when irradiated by UV light, thereby bonding the solder tape group 200 to the front surface of the battery cell 100.

[0136] For the case where the first glue dots 300 are photosensitive glue dots. In order to be able to cure the first glue dots 300, as Figure 16As shown, the battery stringing device in the embodiment of the present application further includes a glue dot curing mechanism 7, and the glue dot curing mechanism 7 is a UV light source. The glue dot curing mechanism 7 is located above the welding conveyor line 5 and in front of the welding mechanism 6. Of course, the glue dot curing mechanism 7 can also be located between the welding mechanism 6 and the second glue application mechanism 8. The glue dot curing mechanism 7 is configured to cure the first glue dots 300 on the front of the battery cell 100, so that the solder ribbon group 200 is bonded to the front of the battery cell 100. The glue dot curing mechanism 7 is a UV light source.

[0137] By arranging the glue dot curing mechanism 7 in front of the welding mechanism 6, the glue dot curing mechanism 7 first completes the curing of the first glue dots 300, thereby preliminarily bonding the solder ribbon group 200 to the front of the battery cell 100. Subsequently, the welding mechanism 6 welds the solder ribbon group 200 to the front of the battery cell 100, finally ensuring a certain connection strength between the solder ribbon group 200 and the front of the battery cell 100. In addition, since the solder ribbon group 200 has been preliminarily bonded and positioned on the front of the battery cell 100 before welding, in this way, the welding quality of the welding mechanism 6 for the solder ribbon group 200 can be improved, and false soldering can be prevented.

[0138] By arranging the glue dot curing mechanism 7 between the welding mechanism 6 and the second glue application mechanism 8, after the solder ribbon group 200 is welded to the front of the battery cell 100, the solder ribbon group 200 can be preliminarily bonded to the front of the battery cell to ensure a certain connection strength between the solder ribbon group 200 and the front of the battery cell 100.

[0139] As Figure 16 shown, optionally, the second glue application mechanism 8 includes a conveyor line, a first glue application part 83, a flipping part (not shown in the figure), and a second glue application part 84, where: the conveyor line is close to the output end of the welding conveyor line 5, and is configured to receive the battery string output by the welding conveyor line 5 and convey the battery string to the first glue application station, the flipping station, and the second glue application station in sequence.

[0140] The first glue application part 83 is arranged at the first glue application station and is configured to apply second glue dots 400 to the solder ribbon group 200 on the front of the battery string.

[0141] The flipping part is arranged at the flipping station and is configured to pick up the battery string that has completed front-side glue application from the conveyor line and flip the battery string and then put the battery string back on the conveyor line.

[0142] The second glue application part 84 is arranged at the second glue application station and is configured to apply second glue dots 400 to the solder ribbon group 200 on the back of the battery string.

[0143] By setting the second sizing mechanism 8, the battery string that has completed welding output by the welding conveyor line 5 can be directly transferred to the conveyor line of the second sizing mechanism 8 without picking up and transporting the battery string, thereby reducing the risk of damage to the battery string. After the solder tape group 200 on the front of the battery string is sized at the first sizing station, the conveyor line transports the battery string to the flipping station. The flipping part flips the battery string and places the flipped battery string back on the conveyor line, and the conveyor line continues to transport the battery string to the second sizing station, where the solder tape group 200 on the back of the battery string is sized.

[0144] It can be seen that the sizing processes of the solder tape group 200 on the front and back of the battery string are both completed on the conveyor line. In this way, the battery string can be supported by the conveyor line during the sizing process, so as to maintain a stable horizontal state, thereby avoiding the shaking of the battery string during the sizing process, and finally improving the sizing accuracy of the first sizing part 83 and the second sizing part 84 for the solder tape group 200 and preventing the second glue point from being applied to the fine grid line 101 of the battery cell.

[0145] The flipping part can adopt various existing flipping mechanisms that can suck and flip the battery cell 100. For example, the flipping part includes a flipping unit and a handling unit. Among them, the flipping unit is used to suck the battery string from the conveyor line and flip the battery string by 180° so that the back of the battery string faces up. Subsequently, the handling unit sucks the battery string that has been flipped from the flipping unit and places the battery string on the conveyor line.

[0146] The flipping unit can, for example, include a third driving component, a flipping driving component, and a first battery string adsorption component. Among them, the flipping driving component is connected to the driving end of the third driving component, and the first battery string adsorption component is connected to the driving end of the flipping driving component. The first battery string adsorption component includes a plurality of suction cups arranged along the length direction of the battery string. When the first sizing part 83 completes the sizing of the solder tape group 200 on the front of the battery string, the third driving component drives the first battery string adsorption component to move towards the battery string, so that the first battery string adsorption component sucks the battery string from the conveyor line. Subsequently, the flipping driving component drives the first battery string adsorption component to flip 180°, thereby turning over the battery string so that the back of the battery string faces up.

[0147] The handling unit can, for example, include a fourth driving component and a second battery string adsorption component connected to the driving end of the fourth driving component. The second battery string adsorption component includes a plurality of suction cups arranged along the length direction of the battery string. The fourth driving component is used to drive the second battery string adsorption component to move and switch between the flipping unit and the conveyor line, so that the second battery string adsorption component sucks the battery string that has been turned over from the flipping unit and transports the battery string to the conveyor line.

[0148] In the embodiments of the present application, the first sizing part 83 and the second sizing part 84 in the battery string can apply the second glue dots 400 to the solder ribbon groups 200 on the front and back surfaces of the battery string through any one of the sizing methods such as dispensing, printing glue, spraying glue, brushing glue, and coating glue. Correspondingly, the first sizing part 83 and the second sizing part 84 can be various existing sizing mechanisms such as a dispensing head, a screen printing machine, a nozzle, a brush, a coating pen, etc. that can apply the second glue dots 400 to the solder ribbon groups 200. Using the above sizing mechanisms as the first sizing part 83 and the second sizing part 84 can ensure that the second glue dots are quickly and accurately applied to the solder ribbon groups on the front and back surfaces of the battery string, and the sizing amount of the second glue dots can be accurately controlled.

[0149] In some embodiments, the second glue dots 400 applied by the first sizing part 83 and the second sizing part 84 to the solder ribbon groups 200 are thermosetting glue dots or photosensitive glue dots.

[0150] Optionally, a first curing station located between the first sizing station and the second sizing station, and a second curing station located after the second sizing station are further provided on the conveying path of the conveyor line.

[0151] Correspondingly, the second sizing mechanism 8 further includes a first curing part and a second curing part, where:

[0152] The first curing part is arranged at the first curing station and is configured to cure the second glue dots 400 applied to the solder ribbon groups 200 on the front surface of the battery string.

[0153] The second curing part is arranged at the second curing station and is configured to cure the second glue dots 400 applied to the solder ribbon groups 200 on the back surface of the battery string.

[0154] By setting a first curing station between the first sizing station and the second sizing station and correspondingly arranging a first curing part at the first curing station, the second glue dots 400 applied to the solder ribbon groups 200 on the front surface of the battery string can be quickly cured, thereby improving the stringing efficiency and preventing the second glue dots from sticking to the turning part or the conveyor line.

[0155] By setting a second curing station after the second sizing station and correspondingly arranging a second curing part at the second curing station, the second glue dots 400 applied to the solder ribbon groups 200 on the back surface of the battery string can be quickly cured, thereby improving the stringing efficiency.

[0156] When the second glue dots 400 are thermosetting glue, the first curing part and the second curing part can adopt various existing heating mechanisms that can heat the second glue dots 400, such as a heating lamp box, a hot air blower, etc. When the second glue dots 400 are photosensitive glue dots, the first curing part and the second curing part can adopt a UV light source.

[0157] Such asFigure 16 As shown, optionally, the conveying line includes a first conveying section 81 and a second conveying section 82 located downstream of the first conveying section 81. Among them, the first sizing station is arranged on the conveying path of the first conveying section 81, the second sizing station is arranged on the conveying path of the second conveying section 82, and the turning station is located between the first conveying section 81 and the second conveying section 82.

[0158] The input end of the first conveying section 81 is docked with the output end of the welding conveying line 5. The battery string completed with welding output by the welding conveying line 5 is transferred to the first conveying section 81, and the front side sizing is completed on the first conveying section 81. Subsequently, the turning part picks up the battery string that has completed the front side sizing from the first conveying section 81, turns the battery string so that the back side faces backward, and transports the battery string to the second conveying section 82.

[0159] The conveying line is set to a segmented structure composed of the first conveying section 81 and the second conveying section 82, and the first sizing station and the second sizing station are respectively arranged on the first conveying section 81 and the second conveying section 82. In this way, the sizing of the solder tape group 200 on the front side of the battery string and the sizing of the solder tape group 200 on the back side of the battery string are respectively completed on the first conveying section 81 and the second conveying section 82, which are independent of each other and do not affect each other. In this way, it can be realized that when one string of battery strings is receiving front side sizing on the first conveying section 81, another string of battery strings is receiving back side sizing on the second conveying section 82, thereby improving the stringing efficiency.

[0160] As Figure 16 shown, optionally, the battery stringing device in the embodiment of the present application further includes a string splitting mechanism 9. The string splitting mechanism 9 is located between the output end of the welding conveying line 5 and the second sizing mechanism 8, and the string splitting mechanism 9 is configured to split the overall battery string into multiple independent segmented battery strings. For example, the string splitting mechanism 9 is a shearing mechanism arranged between the output end of the welding conveying line 5 and the input end of the conveying line of the second sizing mechanism 8. Whenever a battery string of a predetermined length transitions from the welding conveying line 5 to the conveying line of the second sizing mechanism 8, the string splitting mechanism 9 immediately cuts off the battery string, thereby obtaining a segmented battery string with a predetermined length.

[0161] It can be seen that by setting the string splitting mechanism 9, the splitting of the overall battery string after welding is realized, thereby obtaining segmented battery strings with a predetermined length that meet the industrial requirements.

[0162] For the case where the second sizing mechanism 8 includes a first sizing part, a first curing part, a turning part, a second sizing part, and a second curing part, the string splitting mechanism 9 can also be arranged between the first curing part and the turning part. The string splitting mechanism 9 first cuts the battery string that has completed front-side sizing into segmented battery strings. Subsequently, the turning part turns the segmented battery strings and places the segmented battery strings with the back side facing up onto the conveyor line. Then, the second sizing part performs sizing on the back side of the segmented battery strings. Compared with turning the entire battery string, turning the segmented battery strings can shorten the length of the turning part.

[0163] As Figure 16 shown, optionally, the battery stringing device in the embodiments of the present application further includes a fixture conveying mechanism 10 and a fixture removing mechanism 11. Among them, the fixture conveying mechanism 10 is arranged in parallel with the welding conveyor line 5 and has the opposite conveying direction.

[0164] The battery sheet placing mechanism 4 is further configured to pick up the fixture from the fixture conveying mechanism 10 and place the fixture on the battery sheet 100 on which the solder tape group 200 is placed on the welding conveyor line 5, so as to press the solder tape group 200 onto the battery sheet 100. The fixture removing mechanism 11 is located behind the welding mechanism 6 and is configured to remove the fixture from the battery sheet and place it back on the fixture conveying mechanism 10. The fixture conveying mechanism 10 conveys the fixture back to the side of the battery sheet placing mechanism 4 for the battery sheet placing mechanism 4 to pick up and use again.

[0165] It can be seen that by setting the fixture conveying mechanism 10, the cyclic conveying of the fixture is realized, enabling the battery sheet placing mechanism 4 to pick up the fixture nearby from the fixture conveying mechanism 10 and place the fixture on the battery sheet 100 on which the solder tape group 200 is placed on the welding conveyor line 5, so as to press the solder tape group 200 onto the battery sheet 100, preventing the solder tape group 200 from shifting during the conveying process, and finally ensuring that the solder tapes in the solder tape group 200 are accurately welded to the corresponding solder tape laying paths. And by setting the fixture removing mechanism 11 behind the welding mechanism 6, after the solder of the solder tape solidifies, the fixture can be automatically removed from the battery sheet 100.

[0166] Optionally, the fixture includes a pressing plate with a hollowed-out part thereon and several rows of pressing needles. The several rows of pressing needles are arranged side by side at the bottom of the pressing plate. When the fixture is placed on the battery sheet 100 on which the solder tape group 200 is placed on the welding conveyor line 5, each row of pressing needles presses one solder tape in the solder tape group 200 onto the battery sheet 100. Subsequently, the welding mechanism 6 heats or irradiates the pressed solder tape through the hollowed-out part on the pressing plate, so that the solder tape is welded to the battery sheet 100.

[0167] The material of the pressing plate is generally a magnetizable metal (such as stainless steel). In order to enable the solar cell placement mechanism 4 to also pick up the pressing tool from the pressing tool conveying mechanism 10. The solar cell placement mechanism 4 in the above embodiment further includes a pressing tool suction assembly (such as an electromagnetic assembly). The pressing and suction assembly is connected side by side with the solar cell suction assembly to the driving end of the first driving assembly. The first driving assembly is further configured to drive the pressing tool suction assembly to move and switch between the pressing tool conveying mechanism 10 and the welding conveying line 5, so that the pressing tool suction assembly sucks the pressing tool from the pressing tool conveying mechanism 10, places the pressing tool on the solar cell 100 where the solder tape group 200 is placed, and removes the pressing tool from the solar cell 100 after the solder of the solder tape solidifies.

[0168] This application has been described in sufficient detail with certain particularities. Those of ordinary skill in the art should understand that the descriptions in the embodiments are only exemplary, and all changes made without departing from the true spirit and scope of this application should fall within the protection scope of this application. The scope of protection required by this application is defined by the claims described, rather than by the above descriptions in the embodiments. On the premise of no contradiction, some optional components in one embodiment can also be used in another embodiment, and some preferred structures of the same component in one embodiment are also applicable to another embodiment. In addition, there may be slight differences in the literal expressions of the names of certain components in different embodiments, and these slight differences will not affect the understanding of the technical solutions of the present disclosure by those skilled in the art.

Claims

1. A battery stringing method, characterized in that: The battery stringing method comprises: S1. Provide a battery cell, wherein a plurality of fine grid lines extending along a second direction are arranged at intervals along a first direction on the front side of the battery cell, and a plurality of fine grid lines extending along the second direction are arranged at intervals along the first direction on the back side of the battery cell, the number of fine grid lines on the front side of the battery cell is less than the number of fine grid lines on the back side, and the first direction is perpendicular to the second direction; S2, applying a first glue point to each solder strip layout path on the front side of the battery cell, wherein the first glue point is staggered with the thin grid lines on the front side of the battery cell, and at least one first glue point is applied to at least two ends of each solder strip layout path, the solder strip layout path is perpendicular to the thin grid lines, and no glue point is applied to the back side of the battery cell; S3, arranging the battery cells and the welding ribbon group to which the first glue point has been applied according to the arrangement rule, welding the welding ribbon group and bonding it to the corresponding battery cells through the first glue point to obtain a battery string, wherein each welding ribbon in the welding ribbon group is arranged one by one on each welding ribbon arrangement path on the battery cell; S4. Apply second glue dots to the solder ribbon groups on the front and back sides of the battery string respectively to reinforce the connection between the solder ribbon groups and the battery cells through the second glue dots, wherein the second glue dots are applied between the fine grid lines on the front side of the battery cells and / or between the fine grid lines on the back side.

2. The battery stringing method according to claim 1, characterized in that: In step S2, at least one first glue point is applied in the middle of each solder strip laying path.

3. The battery stringing method according to claim 1, characterized in that: In step S3, when the first glue point is a thermosetting glue point, the first glue point is heat-cured during the welding process; when the first glue point is a photosensitive glue point, the first glue point is light-cured before or after welding; In step S4, when the second glue point is a thermosetting glue point, the second glue point is heated and cured after the second glue point is applied; When the second glue dots are photosensitive glue dots, light curing is performed on the second glue dots after the second glue dots are applied.

4. The battery stringing method according to claim 1, characterized in that: In step S3, the string arrangement rule is: the back side of the i-th battery cell is stacked on the upper side of the rear section of the i-th welding ribbon group, and the front section of the i+1-th welding ribbon group is stacked on the front side of the i-th battery cell, where i is any natural number greater than 0.

5. The battery stringing method according to claim 1, characterized in that: In step S4, applying second glue points to the welding ribbon groups on the front and back sides of the battery string respectively includes: Simultaneously apply a second glue bead to the ribbon groups on the front and back sides of the battery string; Or, include: Applying a second glue bead to the ribbon group on the front side of the battery string; Turn over the battery string; A second glue bead is applied to the ribbon group on the back side of the string.

6. The battery stringing method according to claim 1, characterized in that: In step S2, applying the first glue point to the solder strip arrangement path on the front side of the battery cell includes: applying the first glue point to the solder strip arrangement path on the front side of the battery cell by dispensing glue, printing glue, spraying glue, brushing glue, or applying glue; In step S4, applying second glue dots to the solder ribbon groups on the front and back sides of the battery string includes: applying second glue dots to the solder ribbon groups on the front and back sides of the battery string by any one of glue application methods including glue dispensing, glue printing, glue spraying, glue brushing and glue coating.

7. The battery stringing method according to claim 1, characterized in that: The cell is a heterojunction cell, the front side of the cell is parallel to the edges of the thin grid lines and has thin main grid lines, the thin main grid lines are perpendicular to the thin grid lines, in step S2, the first glue points applied to the two ends of the welding strip layout path are located on the thin main grid lines; or, The front side of the battery cell has harpoon lines at both side edges parallel to the thin grid lines. In step S2, the first glue points applied to both ends of the solder strip layout path are located on the inner side of the harpoon lines.

8. A battery string device, characterized in that: The battery stringing equipment includes a battery cell conveying mechanism, a first glue applying mechanism, a welding strip placing mechanism, a battery cell placing mechanism, a welding conveying line, a welding mechanism and a second glue applying mechanism, wherein: The cell conveying mechanism is configured to input a cell with the front side facing upward, a plurality of fine grid lines extending along a second direction are arranged at intervals along a first direction on the front side of the cell, a plurality of fine grid lines extending along a second direction are arranged at intervals along the first direction on the back side of the cell, the number of fine grid lines on the front side of the cell is less than the number of fine grid lines on the back side, and the first direction is perpendicular to the second direction; The first glue applying mechanism is configured to apply a first glue point to the solder strip laying path on the front side of the battery cell on the battery cell conveying mechanism, wherein the first glue point is staggered with the fine grid lines on the front side of the battery cell, and at least one first glue point is applied to each of the solder strip laying paths at both ends, and the solder strip laying paths are perpendicular to the fine grid lines; The cell placement mechanism and the solder strip placement mechanism are configured to place the cell with the first glue point applied on the front side and the solder strip group on the welding conveyor line according to a placement rule, wherein each solder strip in the solder strip group is placed one by one on each solder strip placement path on the cell; The welding conveyor line is configured to convey the laid-out battery cells and welding ribbon groups to the welding mechanism, and the welding mechanism is configured to weld the welding ribbon groups to the corresponding battery cells to obtain a battery string; The second glue application mechanism is located at the rear of the welding conveyor line, and is configured to receive the battery string output by the welding conveyor line, and apply second glue points to the solder ribbon groups on the front and back of the battery string, respectively, so as to strengthen the connection between the solder ribbon groups and the corresponding battery cells, wherein the second glue points are applied between the fine grid lines on the front and / or between the fine grid lines on the back of the battery cell.

9. The battery stringing device according to claim 8, characterized in that: The first glue point is a heat-curing glue, and the welding mechanism is further configured to cure the first glue point to bond the welding ribbon group to the corresponding battery cell; or, The first glue point is UV curing glue, and the battery stringing equipment also includes a glue point curing mechanism, which is located above the welding conveyor line and in front of the welding mechanism, or between the welding mechanism and the second glue application mechanism; the glue point curing mechanism is configured to cure the first glue point on the front side of the battery cell so that the welding ribbon group is bonded to the front side of the battery cell; the glue point curing mechanism is a UV light source.

10. The battery stringing device according to claim 8, characterized in that: The second glue applying mechanism comprises a conveying line, a first glue applying unit, a turning unit and a second glue applying unit, wherein: The conveyor line is close to the output end of the welding conveyor line, and is configured to receive the battery string output by the welding conveyor line, and sequentially convey the battery string to the first gluing station, the flipping station and the second gluing station; The first glue applying unit is disposed at the first glue applying station and is configured to apply a second glue point to the welding ribbon group on the front side of the battery string; The flipping unit is disposed at the flipping station and is configured to pick up the battery string on which the front side glue is applied from the conveyor line, flip the battery string and then put the battery string back onto the conveyor line; The second glue applying unit is disposed at the second glue applying station and is configured to apply a second glue point to the welding ribbon group on the back side of the battery string.

11. The battery stringing device according to claim 10, characterized in that: The conveying path of the conveying line is also provided with a first curing station located between the first gluing station and the second gluing station, and a second curing station located after the second gluing station; The second glue applying mechanism further comprises a first curing unit and a second curing unit, wherein: The first curing unit is disposed at the first curing station and is configured to cure the second glue point applied to the welding ribbon group on the front side of the battery string; The second curing section is disposed at the second curing station and is configured to cure the second glue point applied to the welding ribbon group on the back side of the battery string.

12. The battery stringing device according to claim 10, characterized in that: The conveying line includes a first conveying section and a second conveying section located after the first conveying section; The first gluing station is arranged on the conveying path of the first conveying section, the second gluing station is arranged on the conveying path of the second conveying section, and the flipping station is located between the first conveying section and the second conveying section; The flipping unit is configured to pick up the battery string on which the front side glue is applied from the first conveying section, flip the battery string, and then transport the battery string to the second conveying section.

13. The battery stringing device according to claim 11, characterized in that: The battery stringing equipment also includes a string dividing mechanism; the string dividing mechanism is located between the output end of the welding conveyor line and the second glue application mechanism, or the string dividing mechanism is located between the first curing part and the flipping part; the string dividing mechanism is configured to divide the entire battery string into multiple independent segmented battery strings.

14. The battery stringing device according to claim 8, characterized in that: The battery stringing equipment further comprises a press conveying mechanism and a press removing mechanism, wherein the press conveying mechanism is arranged in parallel with the welding conveying line and in opposite conveying directions; The cell placement mechanism is also used to pick up the press from the press conveying mechanism and place the press on the cell with the soldering ribbon group placed on the welding conveying line to press the soldering ribbon group onto the cell; The presser removal mechanism is located at the rear of the welding mechanism and is configured to remove the presser from the battery sheet and put it back into the presser conveying mechanism.

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