WO2021037019A1

WO2021037019A1 - Processing system, processing method and application method for copper mesh for battery piece without main grid

Info

Publication number: WO2021037019A1
Application number: PCT/CN2020/111035
Authority: WO
Inventors: 张国明; 陶爱兵
Original assignee: 苏州携创新能源科技有限公司; 无锡携创新能源科技有限公司
Priority date: 2019-08-30
Filing date: 2020-08-25
Publication date: 2021-03-04
Also published as: CN110534593B; CN110534593A

Abstract

The present application discloses a processing system, a processing method and an application method for a copper mesh for a battery piece without a main grid, which relate to the field of photovoltaic technology. The present application provides a novel copper mesh processing method, comprising: forming a copper wire interwoven structure by means of wire drawing modules, and further processing the copper wire interwoven structure into a required copper mesh by pressing and welding of upper and lower molds, copper wire guide grooves on the lower mold being able to prevent misalignment or relative offset between the copper wires. The copper mesh obtained by processing using the method provided in the present application does not require a backing, so that the problems of high processing difficulty and poor soldering caused by the backing can be avoided while achieving low cost of final products and high efficiency, and the processing and transportation costs of the supplier can be saved, improving the production efficiency, and reducing the material cost of the backing.

Description

Processing system, processing method and application method of copper mesh for busbar-less battery

Technical field

This application relates to the field of photovoltaic technology, in particular to a processing system, processing method and application method of copper mesh for busbar-less cells.

Background technique

With the rise of energy prices, the development and utilization of new energy has become the main topic of research in the energy field today. Because solar energy has the advantages of non-polluting, no regional restrictions, and inexhaustible, the research on solar power generation has become the main direction of the development and utilization of new energy. The use of solar cells to generate electricity is one of the main ways people use solar energy today. It promotes the high conversion efficiency of components, the continuous reduction of component manufacturing costs, and the promotion of component performance. This is an inevitable trend in the development of the industry.

The crystalline silicon cells currently on the market use multiple main grids to be electrically connected by ribbon welding. The current on the cell is collected to the main grid line through the thin grid line, and then flows out through the ribbon on the main grid line. , The multi-bus grid corresponding to the welding ribbon adopts a round structure, which requires high positioning structure during the welding process, and the actual operating position is often shifted. On the one hand, the appearance is poor and the phenomenon of whitening is serious, and the size of the pad on the corresponding cell is also large. , Waste positive silver material and increase the shielding area. In order to solve this problem, some battery manufacturers have designed a battery plate without busbar to match the tinned copper wire group or copper wire mesh welding process. The conventional tinned copper wire group or copper wire mesh welding process uses copper wires whose base material is copper to weld the battery cells. In order to avoid the direct movement of the copper wires, the bottom is covered with a film layer as a backing to prevent the position of the copper wires from shifting Or deformation, the processing technology is complicated, and the copper wire is easily deformed during the packaging and handling process, which cannot be welded with the battery sheet or easily leads to poor welding with the battery sheet. In addition, because the film layer cannot withstand high temperatures, it becomes a molten state during the lamination process. It is easy to fill between the battery sheet and the copper mesh, and isolate the battery sheet from the copper mesh, resulting in poor welding. Therefore, the material requirements for the film layer are The operation process is relatively high, which increases the difficulty of the process, and it is more challenging for conventional cells that require a high temperature of 183 degrees or more.

technical problem

The bottom of the existing tinned copper wire group or copper wire mesh is covered with a film layer as a backing to prevent the position of the copper wire from shifting or deforming. The processing technology is complicated, and the copper wire is easily deformed during packaging and handling. Welding with the cell or easily leads to poor welding with the cell. In addition, because the film layer cannot withstand high temperatures, it will easily become a molten state during the lamination process and fill between the cell and the copper mesh to isolate the cell from the copper mesh. , Resulting in poor welding and increasing the difficulty of the process.

Technical solutions

A processing system for a copper mesh for a busbar-less battery cell, the processing system includes a compression welding die, a feeding device, a first wire drawing module and a second wire drawing module; the compression welding die includes a vertical direction oppositely arranged The upper mold and the lower mold, the upper mold is provided with a raised pressing pin on the side facing the lower mold, and the lower mold is provided with a copper wire guide groove on the side facing the upper mold, and the upper mold and the lower mold face each other in the vertical direction Or move opposite to each other; the feeding device provides copper wire for the first wire drawing module and the second wire drawing module;

The first drawing module includes a pair of first pressing plates arranged along the first direction in the horizontal direction, and at least two pressing heads are respectively provided at the end of each first pressing plate; the pressing heads of the two first pressing plates are arranged oppositely, The two first pressing plates move between the upper mold and the lower mold in the first direction or move away from each other to the two sides of the pressure welding mold. The first wire drawing module feeds materials through the opposite movement of the two first pressing plates. The copper wire provided by the device is drawn to form N copper wires located between the upper mold and the lower mold along the first direction;

The second drawing module includes a pair of second pressing plates arranged along the second direction in the horizontal direction, and at least two pressing heads are respectively provided at the end of each second pressing plate; the pressing heads of the two second pressing plates are arranged opposite to each other, The two second pressing plates move in the second direction between the upper mold and the lower mold toward or away from each other to the two sides of the pressure welding mold. The second wire drawing module feeds materials through the opposite movement of the two second pressing plates. The copper wire drawn by the device forms M copper wires along the second direction between the upper die and the lower die. The M copper wires along the second direction are different from the N copper wires along the first direction. The copper wire interweaving structure that matches the busbar-less cell structure is formed. N copper wires along the first direction and M copper wires along the second direction are directly directed to the copper wires on the lower mold. In the groove, the junction points of the N copper wires along the first direction and the M copper wires along the second direction are directly opposite to the pressure pins on the upper mold.

A further technical solution is that each indenter is elastically connected to the corresponding pressure plate, and the pulling force on the copper wire is controlled by elastic force.

A further technical solution is that the upper mold is provided with cutting knives around the side facing the lower mold.

A further technical solution is that the processing system further includes a flux module, and the flux module is arranged between the feeding device and the first wire drawing module and the second wire drawing module.

A further technical solution is that the upper mold is also provided with a pressure pin at the copper wire facing the predetermined area of the copper wire interlaced structure, wherein the predetermined area is a copper mesh formed by processing and laying on the busbarless battery sheet corresponding to each upper and lower phases. The area adjacent to the overlap between two rows of busbar-free cells.

A method for processing a copper mesh for a busbarless battery is applied to the copper mesh processing system for a busbarless battery disclosed in the present application, and the method includes:

Install the copper wire coil in the feeding device, which provides copper wire for the first wire drawing module and the second wire drawing module;

The first wire drawing module moves the two first pressure plates against each other, and uses the pressure heads on the two first pressure plates to draw the copper wires to form N copper wires located between the upper mold and the lower mold along the first direction; The second wire drawing module moves the two second pressure plates against each other, and uses the pressure heads on the two second pressure plates to draw the copper wires to form M copper wires located between the upper mold and the lower mold along the second direction. The M copper wires along the second direction and the N copper wires along the first direction are on different levels and form an interwoven structure of copper wires that matches the structure of the busbar-less cell;

The upper mold and the lower mold press the copper wire interlaced structure into the respective copper wire guide grooves of the card access to the lower mold, and the upper mold presses and welds each junction point of the copper wire interlaced structure to form copper for busbar-less battery cells. network.

A further technical solution is that the method further includes: cutting the copper wire interwoven structure through the surrounding cutters during the pressing process of the upper mold.

A further technical solution is that the upper mold is also provided with a pressing needle at the copper wire facing the predetermined area of the copper wire interlaced structure, and the method further includes:

The upper mold is pressed against the predetermined area of the copper wire interlaced structure by pressing at the predetermined area to form a concave structure. The predetermined area is a copper mesh formed by processing and laying on the busbar-less battery sheet, corresponding to each two adjacent rows of the busbar-free battery. The area of overlap between slices.

A further technical solution is that the method further includes: using a thinning die to thin a predetermined area of the copper wire interlaced structure to form an inner concave structure, and the predetermined area is a copper mesh formed by processing and laying on the busbar-less battery. The area of the overlap between two adjacent rows without busbar cells.

A further technical solution is that the method further includes:

Transfer the busbar-less battery with copper mesh to the turnover tray or directly lay it on the busbar-less battery in the stringer. The transfer method includes: the busbarless battery is clamped and transferred with the copper mesh, or clamped The busbarless solar cells are transferred by dragging and transferring on one side of the copper mesh, or the busbarless solar cells are transferred by the copper mesh through the transfer assembly.

An application method of a copper mesh for a busbar-free cell, the application method including:

Lay the busbarless battery sheet processed by the processing method according to any one of claims 6-10 with a copper mesh on the busbarless battery sheet, and one row of the two rows of busbarless battery sheets to be connected passes through the front of the battery sheet It is in contact with the copper mesh for the busbarless battery, and the other row is in contact with the copper mesh for the busbarless battery through the back of the battery slice; each row of busbarless battery includes multiple battery slices, one for busbarless battery slice Copper mesh covers multiple rows of cells;

The busbar-less battery is welded with a copper mesh and the contacted busbar-free battery to form a photovoltaic cell module battery layer.

Its further technical solution is to weld the copper mesh for the busbarless cell and the busbarless cell in contact to form the photovoltaic cell module cell layer, including:

Use the heating welding process to weld the copper mesh for the busbarless battery and the contacted busbarless battery together;

Alternatively, a low-temperature welding process is adopted to weld the busbar-less battery sheet with copper mesh and the contacted busbar-free battery sheet during the lamination and heating process.

A further technical solution is that the copper mesh for busbar-less cells has a recessed structure at a predetermined area, and the recessed structure of the copper mesh is located in the area of the overlap between two adjacent rows of busbar-free cells.

Beneficial effect

This application discloses a copper mesh processing system for busbar-free cells, a processing method for processing copper mesh using the processing system, and an application method of the processed copper mesh. The processing copper mesh in this application does not require a backing and is implanted In the string welding machine, while being suitable for the low cost and high efficiency of the final product, it avoids the problems of high processing difficulty and poor welding caused by the bottom lining, which can save the supplier's processing and transportation costs, improve production efficiency, and reduce the bottom lining material cost. In addition, this application considers the stress of copper wire welding. The tension of the copper wire is controlled by the height of the pressing plate and the elasticity of the indenter and the pressing plate to ensure that the copper mesh will not be deformed after welding.

Description of the drawings

Fig. 1 is a schematic diagram of the processing system disclosed in the present application.

Fig. 2 is a top view of the lower mold and two drawing modules in the processing system of the present application.

Fig. 3 is a flowchart of the copper mesh processing method and application method disclosed in the present application.

Fig. 4 is a schematic diagram of the application of the copper mesh processed by the copper mesh processing method disclosed in the present application.

FIG. 5 is a schematic diagram of the application of another structure of the copper mesh processed by the copper mesh processing method disclosed in the present application.

Fig. 6 is a schematic diagram of laying between the copper mesh and the battery sheet obtained by the processing of this application.

Implementation of this application

The specific implementation manners of the present application will be further described below in conjunction with the accompanying drawings.

This application discloses a copper mesh processing system for a busbar-less battery cell. Please refer to Figures 1 and 2. The processing system includes a press-welding die. The press-welding die includes an upper die 1 that is opposed to each other in the vertical direction. And the lower mold 2, the upper mold 1 is provided with a raised pressing pin 3 on the side facing the lower mold 2, and the lower mold 2 is provided with a copper wire guide groove 4 on the side facing the upper mold 1, and a copper wire guide groove 4 The opening structure is opened according to the structure of the copper mesh that needs to be processed. For example, in this application, as shown in FIG. The multi-row and multi-column copper wire guide troughs 4 are interwoven, and each row/column of the copper wire guide 4 adopts an interval opening structure, which reduces the cost of slotting on the basis of meeting the needs of use. The upper mold 1 and the lower mold 2 can run opposite to each other in a vertical direction to realize pressing or moving against each other to separate. Optionally, the upper mold 1 is provided with a cutter 5 on the periphery of the side facing the lower mold 2.

The processing system also includes a feeding device 6 in which a copper wire coil is installed. In this application, the feeding device 6 can be implemented as a wire wheel support, and the copper wire coil 7 is installed on the wire wheel support and the wire The rotating shaft on the wheel bracket is fixed, and the copper wire coil 7 rotates with the wire wheel bracket to realize feeding. Each copper wire coil 7 is wound with a copper wire. The copper wire is the raw material for making the copper mesh in this application. The copper wire in this application is a copper wire with a coating on the surface of the copper substrate. The surface of the copper wire is electroplated or coated. Coated tin-lead, tin-bismuth, etc., based on different coatings of copper wires can achieve different temperature welding processes, and conventional tin-lead coatings can achieve soldering temperatures above 183 degrees.

The feeding device 6 provides copper wires for the first wire drawing module and the second wire drawing module. Optionally, the processing system is also provided with a flux module 8 at the discharge port of the feeding device 6, that is, a flux module 8 Set between the feeding device 6 and the first wire drawing module and the second wire drawing module, the copper wire is outputted from the feeding device 6 to the first wire drawing module and the second wire drawing module through the flux module 8 to achieve copper The wire flux is applied.

The cross-sectional view shown in FIG. 1 shows the first wire drawing module. The first wire drawing module includes a pair of first pressing plates 9 and 10 arranged in the horizontal direction along the first direction, and the ends of each first pressing plate are respectively provided with At least two indenters 11. The respective indenters 11 on the two first pressure plates 9 and 10 are arranged in one-to-one correspondence and opposite to each other. The two first pressure plates 9 and 11 can move toward each other between the upper mold 1 and the lower mold 2 along the first direction or Move back to the two sides of the pressure welding mold, as shown in FIG. 1 taking the state where the two first pressure plates 9 and 11 move to the two sides of the pressure welding mold as an example. In actual use, usually one of the first pressing plates 9 is fixed on one side of the pressure welding mold and the other first pressing plate 10 can move relative to the first pressing plate 9 in the first direction. Please refer to the top view shown in FIG. 2, similar to the first wire drawing module, the second wire drawing module includes a pair of second pressing plates 12 and 13 arranged in the horizontal direction along the second direction, and the ends of each second pressing plate are respectively At least two indenters 14 are provided. The pressure heads 14 on the two second pressure plates 12 and 13 are respectively arranged in one-to-one correspondence and opposite to each other. The two second pressure plates 12 and 13 move or oppose each other between the upper mold 1 and the lower mold 2 along the second direction. Back movement to both sides of the press welding mold. In actual use, usually one of the second pressing plates 12 is fixed on one side of the pressure welding mold and the other second pressing plate 13 can move relative to the second pressing plate 12 in the second direction. In actual operation, the first direction and the second direction are usually two vertical directions in the horizontal direction.

In the first wire drawing module and the second wire drawing module of the present application, each pressure head and the corresponding pressure plate are respectively elastically connected by an elastic component 15. The copper wire output from the feeding device 6 is sent to the respective pressure heads of the first wire drawing module and the second wire drawing module through the guide wheels for drawing.

Based on the processing system shown in Figs. 1 and 2, this application also discloses a method for processing a copper mesh for a busbar-less battery. Please refer to Fig. 3. The method includes the following steps:

1. Install the copper wire coil 7 in the feeding device 6. As shown in Fig. 1, 9 copper wire coils 7 are installed in the feeding device 6, and copper wire is wound on the copper wire coil 7.

2. The copper wire provided by the feeding device 6 for the first wire drawing module is sent to each indenter through the guide wheel and fixed on each indenter 11 of one of the first pressing plates 9. Similarly, the feeding device 6 is the first The copper wire provided by the second wire drawing module is sent to each indenter through a guide wheel and fixed on each indenter 11 of one of the second pressure plates 12.

Before the copper wire is fed to the first wire drawing module and the second wire drawing module, the copper wire passes through the flux module 8, and the flux module 8 applies flux to the surface of the copper wire to facilitate subsequent welding.

3. The other first pressing plate 10 in the first drawing module moves to the first pressing plate 9 along the first direction, and each pressing head 11 on the first pressing plate 10 respectively grabs the copper wire at each pressing head of the first pressing plate 9 , And then the first pressing plate 10 moves away from the first pressing plate 9 in the first direction to the other side of the pressing and welding mold, and the first drawing module realizes the drawing through the opposite movement of the two first pressing plates to form the upper mold 1. There are N copper wires along the first direction between the lower mold 2 and the lower mold 2, as shown in Fig. 2 with N=6 as an example.

Similarly, the other second pressing plate 13 in the second drawing module moves along the second direction to the second pressing plate 12, and each pressing head 11 on the second pressing plate 13 respectively grabs the copper at each pressing head of the second pressing plate 12. Then the second pressing plate 13 moves away from the second pressing plate 12 in the second direction to the other side of the pressing and welding mold, and the second drawing module realizes the drawing through the opposite movement of the two second pressing plates to form the upper mold The M copper wires between 1 and the lower mold 2 are along the second direction, as shown in Fig. 2 with M=9 as an example.

In actual operation, copper wires can be fixed at each indenter of each drawing module for drawing, or copper wires can be fixed only at part of the indenters to draw different numbers of copper wires with different pitches as needed. For example, the width of the copper mesh required for the head and tail of the battery is relatively small, so it is necessary to adjust the width of the copper mesh and the spacing between the wires. For example, the width of the battery is set to 26mm, and the width of the network between two solar cells is 45mm. ~55mm, the net width of the outermost battery string is between 30mm~35mm. This is just an example, and the size is not limited.

The M copper wires along the second direction and the N copper wires along the first direction are at different levels, and form a copper wire interwoven structure that matches the busbar-less cell structure. The copper wire interwoven structure is located on the upper mold 1. Between the copper wire interlaced structure and the lower mold 2, the copper wires in the copper wire interlaced structure are respectively facing the copper wire guide grooves 4 on the lower mold 2, and the junction points in the copper wire interlaced structure are respectively facing the pressure pins on the upper mold 1. 3.

4. The relative movement of the upper mold 1 and the lower mold 2 presses the copper wire interlaced structure. The copper wire interlaced structure is inserted into the copper wire guide grooves of the lower mold 2 during the pressing process to prevent the occurrence of copper wires. Dislocation or relative movement. As shown in Fig. 2, the horizontal and vertical copper wires are inserted into the copper wire guide groove 4 respectively. At the same time, the upper mold 1 performs pressure welding on each junction point in the copper wire interlaced structure through the pressure needle 3 during the pressing process. In this application, according to the different copper mesh structure to be processed, the pressure welding step has different realizations. the way:

(1) The copper mesh that needs to be processed is a flat structure, then the upper mold 1 pressure-welds each junction point in the copper wire interweaving structure to form a flat net structure, then the specific: the upper mold 1 passes the pressure needle 3 to the copper Each junction point in the silk interlaced structure is flattened, and the copper wire in the first direction and the copper wire in the second direction are flattened to a plane. The upper mold 1 is provided with a lower limit. When the upper mold 1 reaches the lower limit, the Each junction point in the copper wire interwoven structure is pressed into a plane with the copper wire. Then the upper die 1 welds the junction points in the copper wire interwoven structure through the press needle 3.

(2) After the processing of the copper mesh is completed, it needs to be laid on the busbar-free cell. The copper mesh is located between two adjacent rows of busbar-free cells, and between every two adjacent rows of busbar-free cells. There will be overlapping parts, in order to reduce the damage of the battery slices in the overlapping part, when processing the copper mesh, this application also includes the step of thinning the predetermined area of the copper wire interlaced structure, where the copper mesh is laid on When on a busbar-less cell, it corresponds to the area of the overlap between two adjacent rows of busbar-free cells, so that the thickness of the processed copper mesh at the predetermined area is smaller than other areas, thereby forming a concave structure to reduce the cell. Damage received in this overlapped part. Then the step of thinning can be performed between the steps of flattening each junction point and welding each junction point, or after flattening and welding each junction point, or it can be performed at the same time as the step of flattening each junction point. . The step of thinning can be performed by the upper mold 1. The upper mold 1 is also provided with a pressure needle at the copper wire facing the predetermined area of the copper wire interlaced structure, and the upper mold is directed to the predetermined copper wire interlaced structure by pressing at the predetermined area. The area is thinned to form a concave structure. This thinning step can also be performed by a separate thinning die.

At the same time, during the pressure welding process, each junction point in the copper wire interwoven structure may be short of tin and expose the bare copper. At this time, it is necessary to spray anti-rust materials at the junction point. During the pressing process of the upper mold 1, due to the elastic connection between the indenter and the pressing plate, the tensile force of the copper wire can be controlled by the elastic force to ensure that the copper wire interwoven structure will not be deformed due to stress after welding.

5. Cut off the excess copper wires around the copper wire interweaving structure completed by pressing and welding to form the final finished copper mesh for the busbar-free battery. When cutting knives are provided around the upper mold 1, this step can be performed simultaneously with step 4, that is, the upper mold 1 simultaneously cuts the copper wire interwoven structure through the peripheral cutting knives during the pressing process. A schematic diagram of the cutting position 16 of the cutter 5 is shown in FIG. 2.

In the actual processing process, multiple copper meshes can be cut at one time. That is, a large copper mesh is made, and the position of the cutter is adjusted during the pressing and welding process, and the large copper mesh can be pressed into multiple copper meshes at a time. Or transfer the large copper net and then cut it.

6. Transfer the processed copper mesh: transfer the copper mesh for the busbarless battery to the turnover tray or directly lay it on the busbarless battery in a special welding machine. The transfer method includes: use copper for the busbarless battery. The net is clamped and transferred, or, the side of the copper mesh for the busbarless battery is dragged and transferred, or the busbarless battery is transferred by the copper mesh through the transfer assembly. When multiple copper meshes are produced in step 5, alternate transfer is adopted to increase the overall processing speed.

After the copper mesh is processed by the above-mentioned processing method, the copper mesh is used to connect the busbar-less cells to form a photovoltaic cell module, which also includes the following steps:

7. After the processing is completed, directly lay the copper mesh on the busbarless cell in the specially developed welding machine, or take the copper mesh from the turnover tray and lay it on the busbarless cell in the special welding machine. An independent copper mesh is set between the two rows of busbarless cells to be connected. As shown in Figure 4-6, one side of the copper mesh A falls on the front of one row of cell B, and the other side falls on the other. The back of the row of cells B, that is, one of the two rows of busbarless cells to be connected is in contact with the copper mesh A through the front of the cell, and the other row is in contact with the copper mesh A through the back of the cell. And an independent copper mesh can cover and connect multiple rows of solar cells at one time, that is, each row of solar cells includes multiple solar cells. As shown in Figure 4, the copper mesh A has a flat structure as an example. As shown in Figure 5, the copper mesh A has a concave structure C at a predetermined area. As shown in Figure 5, it can be clearly seen that two adjacent rows of cells without busbars The area of the overlap between B is located at the concave structure C of the copper mesh A.

8. Weld the copper mesh A produced in this application and the busbar-free cell B in contact with each other to form a photovoltaic cell module cell layer. The welding between the copper mesh A and the cell B can be welded in a special welding machine using a heating welding process, or, using a low-temperature welding process and welding during a lamination heating process. Before welding, it is necessary to spray flux on the copper mesh or the junction part of the copper mesh or the part of the battery that needs to be welded to increase the welding effect.

The above are only the preferred implementation manners of the present application, and the present application is not limited to the above embodiments. It can be understood that other improvements and changes directly derived or contemplated by those skilled in the art without departing from the spirit and concept of the application should be deemed to be included in the scope of protection of the application.

Claims

A processing system for a copper mesh for a busbar-less battery cell, characterized in that the processing system includes a compression welding die, a feeding device, a first wire drawing module and a second wire drawing module; the compression welding die includes An upper mold and a lower mold are arranged opposite to each other in a vertical direction, the upper mold is provided with a convex pressing pin on the side facing the lower mold, and the lower mold is provided with copper on the side facing the upper mold Wire guide groove, the upper die and the lower die move toward or away from each other along the vertical direction; the feeding device provides copper wires for the first wire drawing module and the second wire drawing module;

The first drawing module includes a pair of first pressing plates arranged along a first direction in a horizontal direction, and at least two pressing heads are respectively provided at the end of each first pressing plate; The pressure heads are arranged oppositely, and the two first pressure plates move toward or away from each other between the upper mold and the lower mold along the first direction to the two sides of the pressure welding mold. A wire drawing module draws the copper wires provided by the feeding device through the opposite movement of the two first pressing plates to form N copper wires located between the upper die and the lower die along the first direction;

The second drawing module includes a pair of second pressing plates arranged along a second direction in the horizontal direction, and at least two pressing heads are respectively provided at the end of each second pressing plate; The pressure heads are arranged oppositely, and the two second pressure plates move toward or away from each other between the upper mold and the lower mold along the second direction to the two sides of the pressure welding mold. The second wire drawing module draws the copper wires provided by the feeding device through the opposite movement of the two second pressing plates to form M copper wires located between the upper mold and the lower mold along the second direction, so The M copper wires along the second direction and the N copper wires along the first direction are on different levels and form an interwoven structure of copper wires that matches the busbar-less cell structure, and the N wires are along The copper wires in the first direction and the M copper wires along the second direction respectively face each copper wire guide groove on the lower mold, and the N copper wires along the first direction and the M Each junction point of the copper wire along the second direction is directly opposite to each pressing pin on the upper mold.
The processing system according to claim 1, wherein each pressure head is elastically connected to the corresponding pressure plate, and the pulling force on the copper wire is controlled by elastic force.
The processing system according to claim 1, wherein the upper mold is provided with a cutter around a side facing the lower mold.
The processing system according to any one of claims 1-3, wherein the processing system further comprises a flux module, and the flux module is arranged on the loading device and the first wire drawing module and Between the second drawing module.
The processing system according to claim 1, wherein the upper mold is also provided with a pressure pin at the copper wire facing the predetermined area of the copper wire interweaving structure, wherein the predetermined area is formed by processing the copper wire. When the net is laid on the busbarless battery slice, the area corresponding to the overlap between two adjacent rows of the busbarless battery slice.
Type here claim 6 a method for processing a copper mesh for busbar-less cells, which is applied to the processing system according to any one of claims 1-5, characterized in that the method comprises:

Installing a copper wire coil in the feeding device, which provides copper wires for the first wire drawing module and the second wire drawing module;

The first wire drawing module moves the two first pressure plates against each other, and uses the pressure heads on the two first pressure plates to draw the copper wire to form N edges between the upper die and the lower die. The copper wire in the first direction; the second wire drawing module through the movement of the two second pressing plates against each other, using the indenters on the two second pressing plates to draw the copper wire to form the upper die and The M copper wires along the second direction between the lower molds, the M copper wires along the second direction and the N copper wires along the first direction are in different horizontal planes and form a different level. Copper wire interwoven structure matched with grid cell structure;

The upper mold and the lower mold press the copper wire interlaced structure into each copper wire guide groove that is inserted into the lower mold, and the upper mold presses against each boundary of the copper wire interlaced structure. Spots are pressure-welded to form a copper mesh for busbar-less cells.
The processing method according to claim 6, characterized in that, the method further comprises: cutting the copper wire interwoven structure by the peripheral cutters during the pressing process of the upper mold.
The processing method according to claim 6, wherein the upper mold is also provided with a pressing needle at the copper wire facing the predetermined area of the copper wire interlaced structure, and the method further comprises:

The upper mold is thinned by pressing at a predetermined area against a predetermined area of the copper wire interlaced structure to form a concave structure. The predetermined area is a copper mesh formed by processing and laying on a busbar-less battery sheet corresponding to each upper and lower adjacent The area of the overlap between two rows of busbar-free cells.
The processing method according to claim 6, characterized in that the method further comprises: using a thinning die to thin a predetermined area of the copper wire interlaced structure to form a concave structure, and the predetermined area is formed by processing copper. When the net is laid on the busbarless battery slice, the area corresponding to the overlap between two adjacent rows of the busbarless battery slice.
The processing method according to any one of claims 6-9, wherein the method further comprises:

The copper mesh for the busbar-free battery is transferred to the turnover tray or directly laid on the busbarless battery in the stringer. The transfer method includes: the busbar-free battery is clamped and transferred by the copper mesh, Alternatively, one side of the copper mesh for the busbarless battery is clamped and transferred, or the copper mesh for the busbarless battery is transported and transferred by a transfer assembly.
An application method of a copper mesh for a busbar-less battery, characterized in that the application method includes:

Lay the busbarless battery slices processed by the processing method according to any one of claims 6-10 with copper mesh on the busbarless battery slices, and one row of the two rows of busbarless battery slices to be connected passes through the battery The front side of the sheet is in contact with the copper mesh for the busbar-free battery, and the other row is in contact with the copper mesh for the busbar-free battery through the back of the battery sheet; each row of busbar-less battery sheet includes a plurality of battery sheets, one The busbar-free battery is covered with copper mesh in multiple rows of battery;

The busbar-free battery is welded with a copper mesh and the contacted busbar-free battery to form a photovoltaic cell module battery sheet layer.
The application method according to claim 11, characterized in that said welding the copper mesh for the busbarless cell and the contacted busbarless cell together to form a photovoltaic cell module cell layer comprises:

Using a heating welding process to weld the copper mesh for the busbarless battery and the contacted busbarless battery;

Alternatively, a low-temperature welding process is used to weld the busbar-free battery sheet with the contacted busbar-free battery sheet with a copper mesh during the lamination and heating process.
The application method according to claim 11, wherein the copper mesh for the busbar-less battery has a concave structure at a predetermined area, and the concave structure of the copper mesh is located in two adjacent rows of the busbar-free battery. The area of overlap between slices.