A stacking string method and string making device

Abstract

The invention discloses a stacking string method and string making equipment, and relates to the technical field of battery string production. The method comprises: providing a plurality of laying units, wherein one end of a metal wire in the laying unit is arranged on the inner side close to the edge of one side of a battery cell, and the other end extends to the other edge of the battery cell and is connected to a conductive line; the second side containing the conductive line in the plurality of laying units is stacked on the front side of the battery cell at the first edge of an adjacent laying unit to be laid as a battery pack; one end of a segmented welding strip is overlapped on the conductive line of an adjacent laying unit, and the other end is overlapped on the front side of the battery cell of the laying unit, and heated and welded to form a battery string. The stacking string method in the present application utilizes a metal wire instead of a battery cell grid line to more easily detect the electrical performance of the battery cell, so that the electrical performance of each power generation battery cell of the component is closer, thereby reducing the risk of component mismatch and the production cost of the battery cell, and the battery string preparation process is simple and the string making efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of battery string production, and in particular to a battery string stacking method and battery string manufacturing equipment. Background Art

[0002] The multi-busbar structure of the cell uses silver paste printed on the surface of the cell. It is difficult to test and sort the cell busbars and to weld the solar cells in series, which may cause distortion of the electrical performance data obtained by the test. At the same time, the mismatch of the components will also lead to increased power loss. In addition, in order to reduce the loss of silver paste in the cell, it is necessary to provide a solar cell that can greatly reduce the silver consumption and reduce the difficulty of the cell testing and sorting and welding process. A metal wire is used to replace the busbar in the cell, and the metal wire is used to lead the current on the cell and connect it in series with other cells. Now there is an urgent need for a series connection process and equipment that can connect the cells in series into a battery string that constitutes a photovoltaic module. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a string stacking method and string making equipment.

[0004] In a first aspect, the present application provides a stacking method, comprising:

[0005] S1, providing a plurality of laying units, wherein the laying units include a battery cell and a plurality of metal wires connected to the back of the battery cell, wherein one end of the metal wire is arranged on the inner side of a first edge close to the battery cell, and the other end of the metal wire extends to a second edge of the battery cell and is connected to a conductive line;

[0006] S2, stacking the laying units so that the second edge of the laying unit containing the conductive wire is overlapped with the front side of the battery sheet of the first edge of an adjacent laying unit to form a battery pack;

[0007] S3, laying the segmented welding tape on the front side of the laying unit, wherein one end of the segmented welding tape is overlapped on the upper part of the conductive wire of the N+1th laying unit stacked on the Nth laying unit, and the other end of the segmented welding tape is overlapped on the front side of the battery cell of the Nth laying unit, and the battery pack and the segmented welding tape are heated to make the segmented welding tape, the conductive wire and the front side of the battery cell fixedly connected in series to form a battery string, and N is a natural number ≥1.

[0008] Furthermore, the battery string also includes a tail end welding strip laid at the tail end of the battery string, one end of the tail end welding strip is laid on the front side of the tail end battery cell, and the other end extends out of the preset length of the tail end battery cell, and the tail end welding strip is laid on the front side of the laying unit synchronously or step by step with the segmented welding strip.

[0009] Furthermore, the S2 further includes:

[0010] Grab a plurality of laying units at the same time, and synchronously merge the plurality of laying units so that the second edge of each laying unit provided with the conductive wire overlaps the front side of the battery sheet of the first edge of the adjacent laying unit to form the battery pack, or,

[0011] Sequentially grab the individual laying units, and overlap the second side of the N+1th laying unit on the front side of the battery cell on the first side of the Nth laying unit to form the battery pack, where N is a natural number ≥1.

[0012] Furthermore, the laying unit includes the conductive wire arranged adjacent to the second side of the battery cell, the metal wire on the back side of the battery cell extends out of the second side of the battery cell and is electrically connected to the conductive wire, and the bottom of the conductive wire overlaps and stacks with the first edge of the front side of the battery cell adjacent to the laying unit to form the battery pack.

[0013] Furthermore, the laying unit includes the conductive wire attached to the back side of the second side of the battery cell and extending out of the second side of the battery cell, the metal wire on the back side of the battery cell extends to the second side of the battery cell and is electrically connected to the conductive wire, and the bottom of the conductive wire extending out of the second side of the battery cell overlaps the first edge of the front side of the battery cell of the adjacent laying unit to form the battery pack.

[0014] Furthermore, laying the segmented welding tape on the front side of the battery pack includes: laying several groups of the segmented welding tapes synchronously on the front sides of a plurality of the laying units, or laying them sequentially on the front sides of a plurality of the laying units, so that one end of the segmented welding tape overlaps the conductive line of the N+1th laying unit and is stacked on the upper part of the Nth laying unit, and the other end of the segmented welding tape overlaps the front side of the battery cell of the Nth laying unit.

[0015] Furthermore, the cross-section of the metal wire is a triangle.

[0016] Furthermore, in S3, before laying the segmented weld tape, it also includes: stacking a press on top of the segmented weld tape, and when laying the segmented weld tape on the laying unit, synchronously transporting and stacking the segmented weld tape and the press placed on top of the segmented weld tape on the battery pack, and after releasing the segmented weld tape, the press is used to position the segmented weld tape on the upper part of the battery pack.

[0017] Further, the presser presses against the upper portion of the segmented solder strip in contact with the front side of the battery cell, or the presser presses against the upper portion of the segmented solder strip in contact with the conductive wire and the upper portion of the segmented solder strip in contact with the front side of the battery cell at the same time.

[0018] In the second aspect, based on any one of the above-mentioned string stacking methods, the present application also proposes a string making device, which includes a sheet supply device, a string laying mechanism, a string laying table, a welding tape preparation mechanism and a welding device. The sheet supply device is arranged at the front side of the string laying mechanism, and is used to provide a laying unit to the string laying table. The string laying mechanism can be movably arranged between the sheet supply device and the string laying table, and is used to grab the laying unit and overlap the second edge of the laying unit containing the conductive wire on the front side of the battery cell of the first edge of an adjacent laying unit to lay it as a battery pack. The welding tape preparation mechanism is arranged on one side of the string laying table, and is used to provide segmented welding tapes, and transport the segmented welding tapes to the upper part of the battery pack laid on the string laying table, so that one end of the welding tape is welded to the conductive wire overlapped by an adjacent laying unit, and the other end is overlapped on the front side of the battery cell of the laying unit. The welding device is arranged above the string laying table, and is used to weld and interconnect the welding tapes laid on the laying unit of the string laying table and the welding tapes laid on the laying unit.

[0019] Furthermore, the string laying mechanism is movably arranged above the sheet supply device and the string laying table, and lays the laying units on the sheet supply device in sequence on the front side of the battery sheet at the first edge of the last laying unit on the string laying table.

[0020] Furthermore, it also includes a press conveying device for conveying and supplying a plurality of presses, the solder strip preparation mechanism includes a strip making mechanism and a conveying mechanism, the strip making mechanism is used to cut the entire section of solder strip into a plurality of groups of spaced segmented solder strips, and the conveying mechanism synchronously conveys the segmented solder strips and the presses to the upper part of the battery cells of the battery pack on the string laying table.

[0021] Furthermore, the cell supply device includes a cell supply mechanism and a unit preparation mechanism, the cell supply mechanism is used to provide cell cells with a plurality of metal wires fixedly connected to the back of the crystalline silicon cell, and the unit preparation mechanism is used to fix the back of the cell cells provided by the cell supply mechanism to a group of conductive wires, so that the conductive wires are fixedly connected to one end of the metal wires on the back of the cell cells.

[0022] In the stacking method proposed in the present application, metal wires are used instead of the grid lines originally printed on the battery cells. The current on the battery cells is transmitted by the metal wires, thereby reducing the loss of silver paste printed on the battery cells and reducing the production cost of the battery cells. In addition, the metal wires make it easier to detect the electrical properties of the battery cells, so that the electrical properties of the power generation cells in the battery assembly are closer, reducing the risk of component mismatch.

[0023] In addition, an independent laying unit composed of metal wires and conductive wires and crystalline silicon cells is directly laid together with segmented welding strips to form a battery string. It is only necessary to first connect the laying unit that fixes the battery cells with the metal wires with another laying unit to form a battery group, and then directly lay the segmented welding strips corresponding to the laying units on the laid battery group to connect the battery cells in series. There is no need to extend a welding strip to the front and back of two adjacent battery cells respectively as in the traditional battery string welding process, and there is no need to pre-fix the welding strip on the back of the battery cell during the laying process, which reduces the difficulty of making the battery string and improves the efficiency of string making. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the manufacturing steps of the first stacking string method proposed by the present invention;

[0026] Figure 2 A schematic diagram of the manufacturing steps of the second stacking string method proposed by the present invention;

[0027] Figure 3 The present invention is a schematic structural diagram of a string making device proposed by the present invention.

[0028] Wherein, the accompanying drawings are marked as follows:

[0029] 1. Battery cell; 2. Metal wire; 3. Conductive wire; 4. Press; 5. Segmented welding strip; 6. Tail welding strip; 100. Laying unit; 200. Battery pack; 300. Battery string; 10. Cell supply device; 20. String laying mechanism; 30. String laying table; 40. Welding strip preparation mechanism; 41. Belt making mechanism; 42. Transport mechanism; 50. Welding device; 60. Press conveying device. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] Based on a new type of battery cell 1, a metal wire 2 is used to replace the grid line originally printed on the battery cell 1. The current on the battery cell 1 is transmitted by the metal wire 2, thereby reducing the production cost of the battery cell 1. In addition, the metal wire 2 makes it easier to detect the electrical properties of the battery cell 1, which is stable and not easy to distort.

[0034] like Figure 1 , Figure 2 As shown, the present application provides a stacking method, comprising:

[0035] S1, providing a plurality of laying units 100, the laying units 100 comprising a battery cell 1 and a plurality of metal wires 2 connected to the back of the battery cell 1, one end of the metal wire 2 being arranged on the inner side of a first edge close to the battery cell 1, and the other end of the metal wire 2 extending to the second edge of the battery cell 1 and being connected to a conductive wire 3;

[0036] S2, stacking the laying units 100 so that the second edge of the laying unit 100 containing the conductive wire 3 is stacked on the front side of the battery sheet 1 at the first edge of an adjacent laying unit 100 to form a battery pack 200;

[0037] S3, lay the segmented welding tape 5 on the front side of the battery pack 200, wherein one end of the segmented welding tape 5 is overlapped on the upper part of the conductive wire 3 of the N+1th laying unit 100 stacked on the Nth laying unit, and the other end of the segmented welding tape 5 is overlapped on the front side of the battery cell 1 of the Nth laying unit 100, and the battery pack 200 and the segmented welding tape 5 are heated to make the segmented welding tape 5, the conductive wire 3 and the front side of the battery cell 1 fixedly connected in series to form a battery string 300, where N is a natural number ≥1.

[0038] The stacking method proposed in the present application is to extend and fix one end of the metal wire 2 on a conductive wire 3, use the conductive wire 3 to overlap the front of the adjacent battery cell 1, and then directly lay the welding tape on the front of each battery cell of the stacked battery pack. It is not necessary to connect the welding tape in series on the front and back of two adjacent battery cells 1. This method not only reduces the difficulty of laying the battery string and improves the laying efficiency, but also reduces the thickness of the stack between two adjacent battery cells 1, and prevents the battery cells 1 from causing hidden cracks on the edges of the battery cells 1 during lamination. In addition, the metal wire 2 connected to the back of the battery cell 1 draws out the current through the conductive wire 3, and the conductive wire 3 is then conductively connected to one end of the welding tape on the front of an adjacent battery cell 1, so that the front and back of the two adjacent battery cells 1 are connected in series, and one end of the metal wire 2 is indirectly connected to one end of the welding tape through the conductive wire 3, which reduces the difficulty of interconnecting the metal wire 2 with other conductors.

[0039] In addition, the battery string 300 also includes a tail welding strip 6 laid on the battery cell at the tail end of the battery string 300. The battery cell at the tail end of the battery string 300 is the end closest to the rear end of the battery string 300. Since no other laying units 100 are stacked on the front of the battery cell at the tail end of the battery string 300, one end of the tail welding strip 6 is laid on the front of the battery cell 1 and overlapped and fixedly connected with the front of the tail battery cell, and the other end extends out of the preset length of the tail of the tail battery cell. It should be noted that the preset length is used as the lead at the tail end of the battery string 300 to be overlapped and interconnected with other battery strings 300 or wires to draw out the current on the battery string 300.

[0040] It should be noted that the battery string 300 includes a single battery string composed of multiple laying units 100, the laying units 100 are composed of the number of battery cells 1 required for a single battery string, and the single battery string is a complete battery string. The head and tail of the single battery string are not connected to other laying units 100; the battery string 300 can also be a continuous battery string, and the continuous battery string is composed of several single battery strings connected in series by welding strips, and the continuous battery string can be cut into several single battery strings.

[0041] Specifically, in S2, the stacking laying units 100 also include: grabbing a plurality of laying units 100 at the same time, and synchronously merging the plurality of laying units 100 into a battery pack 200 at one time, so that the second edge of the laying unit 100 provided with the conductive wire 3 in each laying unit 100 is overlapped with the front side of the battery cell 1 on the first side of an adjacent laying unit 100 to form a battery pack 200, and then laying a segmented welding strip 5 on the battery pack 200, and the segmented welding strip 5 is then laid on the battery pack 200 and welded into a battery string 300.

[0042] In S2, the stacking laying units 100 may also include: grabbing single laying units 100 in sequence, overlapping the second side of the N+1th laying unit 100 with the front side of the battery cell 1 on the first side of the Nth laying unit 100, N being a natural number ≥1, and continuously laying multiple laying units 100 to form a battery pack 200, and then laying segmented welding strips 5 on the battery pack 200, and then laying the segmented welding strips 5 on the battery pack 200 and welding them into a battery string 300.

[0043] It should be noted that the front side of the battery cell 1 and the back side of the battery cell 1 proposed in the present application only represent the front and back sides in the figure, that is, the back side of the battery cell 1 is the side of the battery cell 1 facing downward, and the front side of the battery cell 1 is the side of the battery cell 1 facing upward, and the front and back sides of the battery cell 1 are not distinguished according to the characteristics of the battery cell 1 itself.

[0044] In some embodiments, the laying unit 100 includes a conductive wire 3 arranged side by side adjacent to the second side of the battery cell 1, and a metal wire 2 on the back side of the battery cell 1 extends out of the second side of the back side of the battery cell 1 and is electrically connected to the conductive wire 3 to form a laying unit 100. The bottom of the conductive wire 3 on the laying unit 100 overlaps with the first edge of the front side of the battery cell 1 of an adjacent laying unit 100 to be stacked into a battery pack 200. In this embodiment, the conductive wire 3 extends out of the battery cell 1 and the bottom of the conductive wire 3 is stacked on the front side of the battery cell 1 on the first side of the adjacent laying unit 100. A preset gap is left between the extended conductive wire 3 and the battery cell 1, and the metal wire 2 is connected to the bottom of the conductive wire 3 in the gap. The purpose is to facilitate direct overlap between the conductive wire 3 and the front side of the battery cell 1 of the laying unit 100, thereby reducing the thickness of the stacking of the laying unit 100 and avoiding the adverse effect of short circuit of the battery cell 1 caused by accidental contact between two battery cells 1 due to close connection.

[0045] In some embodiments, reference Figure 2 As shown, the laying unit 100 includes a conductive wire 3 having one side attached to the back side of the second side of the battery cell 1 and the other side extending out of the second side of the battery cell 1. One end of the metal wire 2 arranged on the back side of the battery cell 1 extends to the second side of the battery cell 1 and is fixedly connected to the conductive wire 3 attached to the second side of the battery cell 1. Both ends of the metal wire 2 do not extend out of the two sides of the battery cell 1. The portion of the conductive wire 3 extending out of the second side of the battery cell 1 overlaps and stacks with the first edge of the front side of the battery cell 1 of the adjacent laying unit 100 to form a battery pack 200.

[0046] In some embodiments, laying the segmented welding tape 5 on the front of the battery pack 200 includes: laying several segmented welding tapes 5 simultaneously on the front of multiple laying units, or placing them step by step on the front of the laying units 100 in the already laid battery pack 200, so that one end of the segmented welding tape 5 overlaps the conductive wire 3 of the N+1th laying unit 100 and is stacked on the upper part of the Nth laying unit 100, and the other end of the segmented welding tape 5 overlaps the front of the battery cell 1 of the Nth laying unit 100.

[0047] Specifically, the segmented welding tape 5 is a small length of welding tape separated from the whole roll of welding tape, and the length of the segmented welding tape 5 is adapted to the width of the front surface area of ​​a single battery cell 1 in the laying unit 100. When the segmented welding tape 5 is laid on the stacked battery pack 200, each segmented welding tape 5 is laid corresponding to the front of a battery cell 1, and one end (the first end) of the segmented welding tape 5 is overlapped on the conductive wire 3 stacked on the first edge of the front of the battery cell 1, and the other end (the second end) is overlapped on the surface of the front of the battery cell 1 not overlapped by the conductive wire 3 on the front of the battery cell 1 stacked corresponding to the conductive wire 3. Then, by heating and welding, the segmented welding tape 5 is interconnected with the surface of the conductive wire 3 and the grid line part of the front of the battery cell 1, and the battery cells 1 are interconnected by the metal wires 2 extending from the battery cells 1, and the battery strings 300 are formed by welding interconnections.

[0048] Compared with the battery string 300 interconnection process of the prior art, the battery string 300 interconnection process proposed in the present application only requires that the laying unit 100 that is fixedly connected to the battery cell 1 by the metal wire 2 is first connected to another laying unit 100 as a battery group 200, and then the segmented welding strips 5 corresponding to the laying units 100 are directly laid on the laid battery group 200 to connect the battery cells 1 in series. There is no need to extend a welding strip to the front and back sides of two adjacent battery cells 1 respectively, and there is no need to pre-fix the wires on the back side of the battery cell 1 during the laying process. The overall string laying process is simple and efficient.

[0049] During the process of laying the battery pack 200, the metal wire 2 is interconnected with the back of the battery cell 1, and the segmented welding strip 5 is fixedly connected to the front of another adjacent battery cell 1. By clamping the conductive wire 3 between the segmented welding strip 5 and the battery cell 1, the metal wire 2 originally fixedly connected to the back of the battery cell 1 is fixedly connected to the segmented welding strip 5 on the front of another battery cell 1 through the conductive wire 3 to form a battery pack 200.

[0050] Preferably, the metal wire 2 in the present application adopts a triangular welding tape. When the triangular welding tape is used, the utilization rate of sunlight by the solar cell is higher. The triangular welding tape can reflect almost all vertically incident light and oblique light. Since the contact area between the triangular welding tape and the main grid line of the solar cell is large, the series resistance of the photovoltaic module is small and the welding strength is high. The triangular welding tape is easy to weld and position, and it is not easy to cause the welding tape to deviate during welding.

[0051] In some embodiments, in S3, before laying the segmented weld ribbon 5, it also includes: preparing a plurality of presses 4, and before laying the segmented weld ribbon 5, pre-stack the presses 4 on top of each segmented weld ribbon 5, and when laying the segmented weld ribbon 5 on the battery pack 200, the segmented weld ribbon 5 and the press 4 placed on the segmented weld ribbon 5 are transported together and stacked on the battery pack 200, and the press 4 is used to press and position the segmented weld ribbon 5 placed on the battery pack 200 to prevent the segmented weld ribbon 5 placed on the battery pack 200 from moving freely before entering the welding position, and offsetting from the corresponding welding position on the battery cell 1, thereby resulting in poor welding quality of the battery string 300.

[0052] In some embodiments, the above-mentioned press 4 is pressed against the upper part of the segmented welding tape 5 in contact with the front side of the battery cell 1. The press 4 only presses the part of the segmented welding tape 5 extending to the front side of the battery cell 1 and in contact with the surface of the battery cell 1 to position the segmented welding tape 5 on the battery cell 1, and the press 4 and the segmented welding tape 5 pressed under the press 4 and the laying unit 100 are synchronously transported to the welding position, and the welding position welds the segmented welding tape 5 to the surface of the conductive wire 3 and the front side of the battery cell 1; or, the press 4 is pressed against the upper part of the segmented welding tape 5 in contact with the conductive wire 3 and the surface of the front side of the battery cell 1 at the same time. For the upper part of the segmented welding strip 5 in surface contact, the press 4 not only crimps the second end of the segmented welding strip 5 laid on the upper part of the conductive wire 3 onto the conductive wire 3, but also crimps the first end of the segmented welding strip 5 laid on the front of the battery cell 1 onto the front of the battery cell 1, and at the same time, the same group of segmented welding strips 5 laid on the front surface of the battery cell 1 and on the conductive wire 3 are pressed as a whole, and all the segmented welding strips 5 laid in different distribution areas on the battery pack 200 are further positioned to prevent poor welding of the segmented welding strips 5 due to the offset of the segmented welding strips 5, thereby improving the welding accuracy of the battery string.

[0053] like Figure 3 As shown, based on the stacking string method proposed above, the present application also proposes a string making device applying the stacking string method, the string making device includes a sheet supply device 10, a string laying mechanism 20, a string laying table 30, a welding tape preparation mechanism 40 and a welding device 50, the sheet supply device 10 is arranged at the front side of the string laying mechanism 20, for providing a laying unit 100, the string laying mechanism 20 can be movably arranged between the sheet supply device 10 and the string laying table 30, for grabbing the laying unit 100 and stacking the second edge of the laying unit 100 containing the conductive wire 3 on the front side of the first edge of an adjacent laying unit 100 to lay the battery cell 1 as a battery pack 200, the welding tape preparation mechanism 40 is arranged on one side of the string laying table 30, for providing a segmented welding tape 5, and transporting the segmented welding tape 5 to the upper part of the battery pack 200 laid on the string laying table 30, and the welding device 50 is arranged on the string laying table 30 for welding and interconnecting the laying unit 100 laid on the string laying table 30 and the welding tape laid on the laying unit 100.

[0054] In some embodiments, the string laying mechanism 20 is movably disposed above the sheet supply device 10 and the string laying table 30, and lays the laying units 100 on the sheet supply device 10 in sequence on the front side of the battery sheet 1 at the first edge of the last laying unit 100 on the string laying table 30.

[0055] In some embodiments, it also includes a press conveying device 60 for conveying and supplying a plurality of presses 4. After the battery string 300 is interconnected and welded, the press 4 involved in laying the battery string 300 needs to be recovered from the interconnected battery string 300 and transferred to the front end of the battery string 300 to participate in the new battery string 300 laying process. The welding strip preparation mechanism 40 includes a strip making mechanism 41 and a conveying mechanism 42. The strip making mechanism 41 is used to cut the entire section of the welding strip into a plurality of groups of spaced segmented welding strips 5. The conveying mechanism 42 synchronously conveys the segmented welding strips 5 and the press 4 to the upper part of the battery cell 1 of the battery pack 200 on the string laying table 30.

[0056] In some embodiments, the cell supply device 10 includes a cell supply mechanism and a unit preparation mechanism. The cell supply mechanism is used to provide a cell 1 with a plurality of metal wires 2 fixedly connected to the back of a crystalline silicon cell. The unit preparation mechanism is used to fix the back of the cell 1 provided by the cell supply mechanism to a group of conductive wires 3, so that the conductive wire 3 is fixedly connected to one end of the metal wire 2 on the back of the cell 1. The laying unit 100 is pre-prepared at the front end of the stacked battery group 200 and participates in the preparation process of the battery string 300.

[0057] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0058] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A stacking method, characterized in that: include: S1, providing a plurality of laying units (100), the laying units (100) comprising a battery cell (1) and a plurality of metal wires (2) connected to the back of the battery cell (1), one end of the metal wire (2) being arranged on the inner side of a first edge close to the battery cell (1), and the other end of the metal wire (2) extending to a second edge of the battery cell (1) and connected to a conductive wire (3); S2, stacking the laying units (100) so that the second edge of the laying unit (100) containing the conductive wire (3) is stacked on the front side of the battery sheet (1) at the first edge of an adjacent laying unit (100) to form a battery pack (200); S3, laying a segmented welding tape (5) on the front side of the battery pack (200), wherein one end of the segmented welding tape (5) is overlapped on the upper part of the conductive wire (3) of the N+1th laying unit (100) and stacked on the Nth laying unit (100), and the other end of the segmented welding tape (5) is overlapped on the front side of the battery cell (1) of the Nth laying unit (100), and the battery pack (200) and the segmented welding tape (5) are heated so that the segmented welding tape (5) is fixedly connected to the conductive wire (3) and the front side of the battery cell (1) to form a battery string (300), wherein N is a natural number ≥1.

2. The stacking method according to claim 1, characterized in that: The battery string further comprises a tail end welding strip (6) laid on the tail end battery cell (1) of the battery string (300), one end of the tail end welding strip (6) being laid on the front side of the tail end battery cell, and the other end extending beyond a preset length of the tail end battery cell (1), and the tail end welding strip (6) and the segmented welding strip (5) being laid on the front side of the battery pack (200) synchronously or step by step.

3. The stacking method according to claim 1, characterized in that: The S2 further includes: Grabbing a plurality of laying units (100) at the same time, and synchronously merging the plurality of laying units (100) so that the second edge of each laying unit (100) provided with the conductive wire (3) overlaps the front side of the battery sheet (1) at the first edge of the adjacent laying unit (100) to form the battery pack (200), or, Sequentially grab the individual laying units (100), and overlap the second side of the N+1th laying unit (100) on the front side of the battery sheet (1) on the first side of the Nth laying unit (100) to form the battery pack (200), where N is a natural number ≥1.

4. The stacking method according to claim 1, characterized in that: The laying unit (100) comprises the conductive wire (3) arranged adjacent to the second side of the battery cell (1), the metal wire (2) on the back side of the battery cell (1) extending out of the second side of the battery cell (1) and electrically connected to the conductive wire (3), and the bottom of the conductive wire (3) overlaps with the first edge of the front side of the battery cell (1) adjacent to the laying unit (100) to form the battery pack (200).

5. The stacking method according to claim 1, characterized in that: The laying unit (100) comprises the conductive wire (3) attached to the back of the second side of the battery cell (1) and extending out of the second side of the battery cell (1); the metal wire (2) on the back of the battery cell (1) extends to the second side of the battery cell (1) and is electrically connected to the conductive wire (3); the bottom of the conductive wire (3) extending out of the second side of the battery cell (1) overlaps with the first edge of the front side of the battery cell (1) of the adjacent laying unit (100) to form the battery pack (200).

6. The stacking method according to claim 1, characterized in that: Laying the segmented welding tape (5) on the front of the battery pack (200) comprises: laying a plurality of groups of the segmented welding tapes (5) on the front of a plurality of the laying units (100) simultaneously, or laying them on the front of a plurality of the laying units (100) in sequence, so that one end of the segmented welding tape (5) overlaps the conductive wire (3) of the N+1th laying unit (100) and is stacked on the top of the Nth laying unit (100), and the other end of the segmented welding tape (5) overlaps the front of the battery cell (1) of the Nth laying unit (100).

7. The stacking method according to claim 1, characterized in that: The cross section of the metal wire (2) is a triangle.

8. The stacking method according to claim 1, characterized in that: In the S3, before laying the segmented welding tape (5), the process further includes: stacking a press (4) on top of the segmented welding tape (5); and when laying the segmented welding tape (5) on the laying unit (100), the segmented welding tape (5) and the press (4) placed on top of the segmented welding tape (5) are synchronously transported and stacked on the battery pack (200); after releasing the segmented welding tape (5), the press (4) is used to position the segmented welding tape (5) on the upper part of the battery pack (200).

9. The stacking method according to claim 8, characterized in that: The pressing tool (4) is pressed against the upper part of the segmented welding strip (5) in contact with the front side of the battery cell (1), or the pressing tool (4) is pressed against the upper part of the segmented welding strip (5) in contact with the conductive wire (3) and the upper part of the segmented welding strip (5) in contact with the front side of the battery cell (1) at the same time.

10. A string making device, characterized in that: Based on the stacking method according to any one of claims 1 to 9, the string making equipment comprises a sheet supply device (10), a string laying mechanism (20), a string laying table (30), a welding strip preparation mechanism (40) and a welding device (50), wherein the sheet supply device (10) is arranged at the front side of the string laying mechanism (20) for providing a laying unit (100) to the string laying table (30), and the string laying mechanism (20) can be movably arranged between the sheet supply device (10) and the string laying table (30) for grabbing the laying unit (100) and stacking the second edge of the laying unit (100) containing the conductive wire (3) on the first edge of an adjacent laying unit (100). The front side of the battery cell (1) is laid as a battery group (200); the welding strip preparation mechanism (40) is arranged on one side of the laying platform (30) and is used to provide segmented welding strips (5) and to carry the segmented welding strips (5) to the upper part of the battery group (200) laid on the laying platform (30), so that one end of the welding strip is welded to the conductive wire (3) overlapped by an adjacent laying unit (100), and the other end is overlapped on the front side of the battery cell (1) of the laying unit (100); the welding device (50) is arranged above the laying platform (30) and is used to weld and interconnect the welding strips laid on the laying unit (100) of the laying platform (30) and the welding strips laid on the laying unit (100).

11. The string making device according to claim 10, characterized in that: The string laying mechanism (20) is movably arranged above the sheet supply device (10) and the string laying table (30), and sequentially lays the laying units (100) on the sheet supply device (10) on the front side of the battery sheet (1) at the first edge of the last laying unit (100) on the string laying table (30).

12. The string making device according to claim 10, characterized in that: It also includes a press conveying device (60) for conveying and supplying a plurality of presses (4); the solder strip preparation mechanism (40) includes a strip making mechanism (41) and a conveying mechanism (42); the strip making mechanism (41) is used to cut a whole section of solder strip into a plurality of groups of spaced segmented solder strips (5); the conveying mechanism (42) synchronously conveys the segmented solder strips (5) and the press to the upper part of the battery cell (1) of the battery pack (200) on the string laying platform (30).

13. The string making device according to claim 10, characterized in that: The cell supply device (10) comprises a cell (1) supply mechanism and a unit preparation mechanism, wherein the cell (1) supply mechanism is used to provide a cell (1) having a plurality of metal wires (2) fixedly connected to the back of a crystalline silicon cell, and the unit preparation mechanism is used to fixly connect a group of conductive wires (3) to the back of the cell (1) provided by the cell (1) supply mechanism, so that the conductive wire (3) is fixedly connected to one end of the metal wire (2) on the back of the cell (1).

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