CN218867136U - Flattening equipment - Google Patents

Abstract

The application provides equipment of flattening should flatten equipment and include: a support assembly for supporting the back contact solar cell; the flattening assembly comprises a pressing plate which is used for matching with the supporting assembly to tightly press the back contact solar cell; the pressing plate and the supporting assembly are arranged at intervals along a first direction; the platen is movable relative to the support assembly in the first direction; the first direction is parallel to a direction in which the support assembly supports the back contact solar cell. In the technical scheme, the back contact solar cell is compressed through the matching of the flattening component and the supporting component, so that the warping condition of the back contact solar cell is improved, and the flatness of the back contact solar cell is improved.

Description

Flattening equipment

Technical Field

The application relates to the technical field of photovoltaic module production, especially relates to a equipment of flattening.

Background

The back contact solar cell has higher cell efficiency and makes the module look more beautiful because the anode and the cathode of the back contact solar cell are designed on the back of the cell. However, the single-side welding causes severe warping of both ends of the battery piece, which adversely affects the performance of the battery itself and the subsequent processes. The current improvement means includes changing the structure of the solder ribbon or the area of the solder, and the like, and although warpage can be improved to some extent, the requirement for equipment is high. For example, the welding strip is designed to be an arc-shaped structure with a buffering structure, the warping degree can be reduced to a certain degree, but the manufacturing of the welding strip has certain process difficulty, and secondly, the accurate positioning of the welding strip on the battery piece has high technical requirements, and the application cost is high; stress is reduced by reducing the contact length between the solder strip and the grid line, and although the warpage degree is improved while the amount of the solder strip is reduced, the shortening of the solder strip can bring corresponding electrical loss.

SUMMERY OF THE UTILITY MODEL

The application provides a flattening apparatus for improving flatness of a back contact solar cell.

In a first aspect, there is provided a flattening apparatus comprising: a support assembly for supporting the back contact solar cell;

the flattening assembly comprises a pressing plate which is used for being matched with the supporting assembly to tightly press the back contact solar cell; the pressing plate and the supporting assembly are arranged at intervals along a first direction; the platen is movable relative to the support assembly in the first direction;

the first direction is parallel to a direction in which the support assembly supports the back contact solar cell.

In the technical scheme, the back contact solar cell is compressed through the matching of the flattening component and the supporting component, so that the warping condition of the back contact solar cell is improved, and the flatness of the back contact solar cell is improved.

In a specific possible embodiment, the support assembly comprises a conveyor belt for conveying the solar cells, and a support plate located on a side of the conveyor belt facing away from the solar cells for supporting the conveyor belt; the pressing plate is positioned on one side of the conveyor belt supporting the back contact solar cell.

In a specific embodiment, the flattening assembly further includes a driving mechanism, and the driving mechanism is connected to the pressing plate and is configured to drive the pressing plate to move back and forth along the first direction.

In a specific possible embodiment, the flattening assembly further comprises a frame disposed on one side of the conveyor belt; the driving mechanism is a linear module, a driving cylinder or a driving hydraulic cylinder which is fixed on the rack; a piston rod of the driving cylinder or the driving hydraulic cylinder is fixedly connected with the pressing plate; or the moving part of the linear module is fixedly connected with the pressing plate.

In a specific possible embodiment, the flattening assembly further comprises a frame disposed on one side of the conveyor belt; the guide rod is arranged on the pressing plate and is connected with the rack in a sliding manner; the driving mechanism comprises a driving motor fixed on the rack and a lead screw connected with the driving motor; the lead screw is fixedly connected with the pressing plate.

In a particular possible embodiment, the platen has a pressing face facing the conveyor belt; the pressing surface is used for pressing at least the warping edge of the back contact solar cell. The length of the pressing surface along a second direction is at least greater than that of one back contact solar cell along the second direction; the length of the pressing surface along a third direction is at least greater than that of one back contact solar cell along the third direction;

wherein the second direction is a length direction in which the conveyor belt conveys the back contact solar cells; the third direction is respectively perpendicular to the first direction and the second direction; the second direction is perpendicular to the first direction.

In a specific possible embodiment, the pressing surface is a frame-shaped surface, and the pressing surface presses the warped edge of the back contact solar cell.

In a specific embodiment, the length of the pressing surface along the second direction is greater than the length of N back-contact solar cells along the second direction; wherein N is a positive integer and is more than or equal to 2.

In a specific possible implementation, when the pressing plate presses the back contact solar cell on the supporting component, the distance d between the pressing plate and the supporting component satisfies:

d is more than or equal to d1 and less than d2; wherein d1 is the thickness of the back contact solar cell, and d2 is the warping thickness of the back contact solar cell.

In a specific possible embodiment, the conveyor belt comprises a support frame, and the support plate is fixedly connected with the support frame;

the device also comprises a conveying wheel arranged on the support and a belt body sleeved on the conveying wheel.

Drawings

Fig. 1 is a schematic structural diagram of a back contact solar cell provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a flattening apparatus according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a transmission device according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a flattening apparatus according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another flattening apparatus according to an embodiment of the present application;

fig. 6 is a schematic diagram illustrating a back contact solar cell being flattened by the flattening assembly according to an embodiment of the present application.

Detailed Description

The present application is described in further detail below with reference to the figures and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.

In order to facilitate understanding of the flattening apparatus provided in the embodiment of the present application, an application scenario of the flattening apparatus is first described. The flattening equipment provided by the embodiment of the application is used for improving the flatness of the back contact solar cell so as to reduce the warping condition of the back contact solar cell in the production process. The method is particularly used for reducing the warping condition of the back contact solar cell.

The current back contact solar cell adopts a mode that for example, a welding strip is designed into an arc-shaped structure with a buffer structure, the warping degree can be reduced to a certain degree, but certain process difficulty exists in the manufacturing of the welding strip, and high technical requirements are required for realizing the accurate positioning of the welding strip on a cell piece, so that the application cost is high. Therefore, the embodiment of the application provides flattening equipment to improve the warping condition of the back contact solar cell. The details of which are set forth in the accompanying drawings and the examples below.

To facilitate understanding of the flattening apparatus of the present application, a back contact solar cell will first be described. Referring to fig. 1, fig. 1 shows a simplified structure of a back contact solar cell. The back contact solar cell (solar cell 10 for short) comprises a silicon wafer substrate 11, a metal electrode and a metal electrode, wherein the silicon wafer substrate 11 is provided with a front surface and a back surface, the front surface of the silicon wafer substrate 11 faces the sun, and the back surface is opposite to the front surface. An emitter, a passivation layer 16 and a metal electrode are arranged on the back of the silicon wafer substrate 11, and the metal electrode is connected with the emitter. It should be understood that the number of the emitters is two, and the emitters are respectively the first emitter 12 and the second emitter 13, and similarly, the number of the corresponding metal electrodes is two, and the metal electrodes are respectively the first metal electrode 14 and the second metal electrode 15, wherein the first metal electrode 14 is electrically connected with the first emitter 12, and the second metal electrode 15 is electrically connected with the second emitter 13.

It should be understood that fig. 1 only illustrates a partial structure of the solar cell, and other layer structures are not shown, but it should be understood that the solar cell 10 provided by the embodiment of the present application should include other layer structures that can implement the solar cell 10.

Since the first metal electrode 14 and the second metal electrode 15 are both located on the back side of the silicon wafer substrate 11, when single-side welding is performed, two ends of a battery piece may be seriously warped, which may adversely affect the performance of the battery itself and subsequent processes.

To facilitate understanding of the flattening apparatus provided in the practice of the present application, several dimensions of the solar cell 10 are defined: d1 is the thickness of the solar cell 10, i.e., the separation distance between the front side of the solar cell 10 and the surface of the back side solder strip. d2 is the warping thickness of the solar cell 10, i.e., the distance between the highest point and the lowest point of the solar cell 10 when warped.

Referring to fig. 2, fig. 2 shows a block diagram of a flattening apparatus 30 provided in an embodiment of the present application. The main structure of the flattening device 30 provided by the embodiment of the present application includes two parts, which are the supporting component 20 and the flattening component respectively. Wherein the support member 20 is used for carrying the solar cell 10, and the flattening member is used for cooperating with the support member 20 to flatten the solar cell 10. The support assembly 20 and the platen assembly are described in detail below with reference to the specific figures.

For convenience of description, a first direction is defined, which is parallel to a direction in which the support member 20 supports the solar cell 10.

In the embodiment of the present application, the support assembly may be a support platform, or may be a structure with a function of transmitting solar cells. When the supporting component is a supporting platform, the supporting component comprises a supporting plate and a frame which is fixedly connected with the supporting plate and is used for supporting the supporting plate.

Referring to fig. 2 and 3 together, fig. 3 shows a schematic structural view of the support assembly. It should be understood that the structure of the portion to be obscured by the support of the support assembly is shown in phantom for convenience in illustrating the structure of the support assembly. When the support assembly is a structure with a function of conveying the solar cells, the support assembly 20 includes a conveyor belt 21 and a support plate 22, wherein the conveyor belt 21 is used for conveying the solar cells 10. The conveyor belt 21 may include a bracket 213, a conveyor wheel 212 connected to the bracket 213, and a belt body 211 fitted around the conveyor wheel 212. It should be understood that when the transfer wheel 212 is specifically configured, the transfer wheel 212 is arranged along the length of the support 213, and the belt body 211 is of an annular structure and is sleeved on the transfer wheel 212 to support the solar cells 10. In addition, the conveyor belt 21 may further include a driving mechanism (not shown), which may include a driving motor and a driving wheel connected to the driving motor, and when the belt body 211 rotates, the driving wheel may rotate to drive the belt body 211 to move.

Of course, it should be understood that the conveyor belt 21 provided in the embodiment of the present application is not limited to the specific structure illustrated above, and may also be other similar structures capable of conveying the solar cells 10, and is not specifically limited in the embodiment of the present application.

While the conveyor belt 21 conveys the solar cells 10, the solar cells 10 are placed on the belt body 211 and conveyed along the belt body 211. As one example, the conveyor belt 21 may convey a plurality of solar cells 10, and the arrangement direction of the plurality of solar cells 10 is arranged at intervals in the second direction. However, it should be understood that the number of the solar cells 10 conveyed by the conveyor belt 21 is not limited in the embodiment of the present application, and the number of the solar cells may be one, two or more.

The way in which the front side of the solar cell 10 faces the conveyor belt 21 is illustrated in fig. 3. I.e. the warped side of the solar cell 10 faces away from the conveyor belt 21. It should be understood that, in the embodiment of the present application, when the solar cell 10 is placed on the conveyor belt 21, either the back surface of the solar cell 10 (the back surface of the silicon-based substrate) faces the conveyor belt 21 or the front surface of the solar cell 10 (the front surface of the silicon-based substrate) faces the conveyor belt 21 may be used. The embodiments of the present application are not particularly limited.

The supporting plate 22 provided in the embodiment of the present application is used to cooperate with the conveyor belt 21 to support the conveyor belt 21. When the support plate 22 is specifically provided, the support plate 22 is located on a side of the conveyor belt 21 facing away from the solar cell 10 and serves to support the conveyor belt 21. Illustratively, when the conveyor belt 21 adopts the structure shown in fig. 3. The support plate 22 is located on a side of the tape body 211 facing away from the solar cell 10, and is configured to support the tape body 211. Specifically, the supporting plate 22 is fixedly connected to the bracket 213, for example, the supporting plate 22 is fixedly connected to the bracket 213 through a threaded connector (bolt or screw), or the supporting plate 22 is welded to the bracket 213. Of course, other ways of securing the support plate 22 besides the above-described exemplary attachment may be used.

As an alternative, when the supporting plate 22 is disposed, the supporting plate 22 may be spaced apart from a portion of the belt 211 for conveying the solar cells 10 by a certain gap, which is to prevent the belt 211 from rubbing against the supporting plate 22 during movement, and to ensure smooth movement of the belt 211.

It should be understood that when the support plate 22 is disposed, the support plate 22 should be disposed to be offset from the transfer wheel 212 of the transfer belt 21 to avoid interference therebetween.

Referring to fig. 1 and 4 together, fig. 4 shows a schematic structural view of the flattening apparatus. The pressing component 30 provided in the embodiment of the present application includes a pressing plate 31, and the pressing plate 31 is used for cooperating with the supporting component 20 to press the solar cell. The pressure plate 31 and the support assembly 20 are arranged at intervals along the first direction; the platen 31 is movable in a first direction relative to the support assembly 20.

Illustratively, when the support assembly 20 comprises a conveyor belt, the platen 31 is positioned on a side of the conveyor belt supporting the solar cells, and the platen 31 is spaced from the conveyor belt along the first direction. When the pressing plate 31 and the supporting plate 22 are provided, the pressing plate 31 and the supporting plate 22 are also arranged at an interval in the first direction and are opposed to each other. While the pressing plate 31 presses the solar cell downward, the pressing plate 31 may move in a first direction with respect to the support plate 22, the pressing plate 31 approaches the support plate 22, and the conveyor belt is supported by the support plate 22 to ensure that the pressing plate 31 can apply pressure to the solar cell.

When the pressing plate 31 is specifically arranged, the pressing plate 31 is of a plate-shaped structure, one surface of the pressing plate 31 facing the conveyor belt is a pressing surface 311, and the pressing surface 311 is used for pressing at least the warping edge of the solar cell, so that the pressing plate 31 can flatten the solar cell when pressing the solar cell.

In addition, when the pressing surface 311 is specifically arranged, the size of the pressing surface 311 can meet certain requirements. Illustratively, the length of the pressing surface 311 in the second direction is at least greater than the length of one solar cell in the second direction; in addition, the length of the pressing surface 311 in the third direction is at least greater than the length of one solar cell in the third direction. The second direction is the length direction of the solar cell conveyed by the conveyor belt; the third direction is respectively vertical to the first direction and the second direction; the second direction is perpendicular to the first direction.

Illustratively, the size of the pressing surface 311 in the second direction is defined as the length of the pressing surface 311, and the size of the pressing surface 311 in the third direction is defined as the width of the pressing surface 311; defining the size of the solar cell along the second direction as the length of the solar cell, and defining the size of the solar cell along the third direction as the width of the solar cell; then: the length of the pressing surface 311 is greater than the length of the solar cell, and the width of the pressing surface 311 is greater than the width of the solar cell. Thereby guarantee that clamp plate 31 can flatten solar cell when pushing down, and the border of clamp plate 31 all is located the outside at solar cell's border to avoid the border of clamp plate 31 to support and leave the vestige behind pressing on solar cell, guaranteed the security of solar cell at the in-process that flattens. The length of the solar cell is the length of the solar cell after being flattened, i.e. the design length of the solar cell. It should be understood that, besides the above solutions, the size of the pressing surface 311 may also be smaller than that of the solar cell, and only the effect of flattening the solar cell needs to be satisfied.

In the embodiment of the present application, the pressing surface 311 may be a plane surface or a frame-shaped surface. When the pressing surface 311 is a frame-shaped surface, the pressing surface 311 presses the warped edge of the back contact solar cell. On one hand, the effect of flattening the solar cell can be achieved, on the other hand, the contact area between the pressing surface 311 and the solar cell is reduced as much as possible, and the risk that the pressing plate 31 damages the solar cell is reduced.

As an optional scheme, the length of the pressing surface 311 in the second direction is greater than the length of the N solar cells in the second direction; wherein N is a positive integer and is more than or equal to 2. Thereby ensuring that the platen 31 can simultaneously flatten a plurality of solar cells.

Illustratively, the number of the solar cells is N, the gap between the two solar cells after being flattened is M1, and the length of the solar cell after being flattened is M2, then the length L of the pressing surface 311 satisfies: l is more than or equal to N M2+ (N-1) M1. Therefore, the edge of the pressing plate 31 is not pressed on the solar cell, and the safety of the solar cell in the pressing process is ensured.

When the pressing plate 31 presses the solar cell, the pressing plate 31 is driven to move by the driving mechanism 32. Illustratively, the flattening assembly 30 provided by the embodiments of the present application further includes a drive mechanism 32. The driving mechanism 32 is connected to the platen 31 and drives the platen 31 to move back and forth in the first direction. The support assembly 20 stops conveying the solar cells while the solar cells are conveyed by the support assembly 20 under the platen 31. The driving mechanism 32 drives the pressing plate 31 to press down to flatten the solar cells for a certain time, so as to ensure that the solar cells can still be in a flattened state after the pressing plate 31 is taken down. After the flattening of the solar cells is completed, the support assembly 20 may continue to transport the solar cells by driving the platen 31 upward by the driving mechanism 32.

With continued reference to FIG. 4, in one possible implementation, the flattening assembly 30 further includes a frame 33 disposed on one side of the conveyor belt; the driving mechanism 32 comprises a driving cylinder or a driving hydraulic cylinder fixed on the frame 33; the piston rod of the driving cylinder or the driving hydraulic cylinder is fixedly connected with the pressure plate 31. Illustratively, the frame 33 is disposed on one side of the conveyor belt and is fixed relative to the support of the conveyor belt when the drive mechanism 32 is disposed. The frame 33 is an inverted L-shaped structure, wherein the vertical portion of the frame 33 is used to be fixed on the ground (also used as a supporting surface of the stand), and the horizontal portion of the frame 33 extends to the upper side of the supporting assembly 20 and is used to fix the driving cylinder or drive the hydraulic cylinder.

In fixing the driving cylinder or the driving hydraulic cylinder, the driving cylinder or the driving hydraulic cylinder may be fixed to a horizontal portion of the frame 33 by a screw connection (bolt or screw). The piston rod of the driving cylinder or the driving hydraulic cylinder faces the transmission belt. The pressure plate 31 may be fixed to the piston rod by a threaded connection (bolt or screw). Of course, instead of using a threaded connection, welding or other fastening means may be used to secure the pressure plate 31 to the piston rod.

When the pressing plate 31 presses the solar cell, the pressing plate 31 is driven to move back and forth along the first direction by the extension and contraction of the piston rod.

In addition, besides the above structure, a linear module can be adopted to drive the press plate. Illustratively, the linear module is fixed on the frame, and the movable part of the linear module is connected with the pressing plate and can drive the pressing plate to move back and forth along the first direction, and the specific structure of the linear module is not described in detail herein.

Referring to fig. 5, some of the reference numerals in fig. 5 may refer to the same reference numerals in fig. 4. In another specific embodiment, the flattening assembly 20 includes a frame 33 disposed on one side of the conveyor belt; the driving mechanism 35 includes a driving motor 351 fixed on the frame 33, and a lead screw 352 connected to the driving motor 351, and the lead screw 352 is fixedly connected to the pressure plate 31. In a specific arrangement, the rack 33 is an inverted L-shaped structure, and the specific arrangement manner can refer to the above definition, which is not described herein again. An output shaft of the driving motor 351 can be fixedly connected with a nut (not shown) of the screw 352 through a gear assembly (not shown) and is used for driving the nut to rotate, the screw shaft penetrates through the horizontal part of the rack and is slidably connected with the rack, and one end of the screw shaft is fixedly connected with the pressing plate 31.

In addition, the flattening assembly 30 further includes a guide bar 34 disposed on the pressing plate 31, and the guide bar 34 is slidably connected to the frame 33. The length direction of the guide rod 34 is along the first direction, one end of the guide rod 34 is fixedly connected with the pressure plate 31, and the guide rod 34 is slidably connected with the horizontal part of the frame 33, so as to ensure that the pressure plate 31 can move back and forth along the first direction through the guide of the guide rod 34 when sliding.

The pressing may be performed in different ways when the pressing plate 31 presses the solar cell. One way may be to press the solar cell by the self-gravity of the pressing plate 31, and the other way is to drive the pressing plate 31 to press the solar cell by the driving means. These will be described below.

In an implementation, the pressing plate 31 is a pressing plate 31 that presses the solar cell by using its own weight in cooperation with the conveyor belt. For example, the pressing plate 31 may be a metal plate, and the metal plate has a certain weight to ensure that the solar cell can be pressed flat by its own weight. Illustratively, the metal plate may be a steel plate, an iron plate, or an aluminum plate. It should be understood that the weight of the metal plate is specifically set according to the force required for flattening the solar cells and the number of solar cells to be flattened, and the weight of the metal plate is not specifically limited in the embodiment of the present application. It will be appreciated that the weight of the metal plate provided should ensure that the solar cells are not damaged by the platen 31 when the solar cells are flattened.

In another embodiment, the driving mechanism 32 is used to drive the pressing plate 31 to press the solar cells against the conveyor belt. That is, the pressing plate 31 is driven by the driving mechanism 32 to press the solar cell, and the driving mechanism 32 should be a driving mechanism 32 capable of providing a certain pressure. Such as by actuating cylinders or actuating hydraulic cylinders to drive the platen 31 against the solar cell. It should be understood that the pressure provided by the driving mechanism 32 should ensure that the solar cell is not damaged by the pressing plate 31 when the solar cell is pressed flat.

Referring to fig. 1 and 6 together, the pressing in the embodiment of the present application refers to pressing the solar cells on the conveyor belt. Illustratively, the magnitude of the compression of the pressure plate 31 refers to the distance between the belt and the pressure plate 31 being less than the thickness of the solar cell when the solar cell is warped and greater than the thickness of the solar cell. When the pressing plate 31 presses the back-contact solar cell on the support assembly, the distance d between the pressing plate 31 and the support assembly, that is, the size when the pressing plate 3131 presses the solar cell on the conveyor belt, satisfies the following: d is more than or equal to d1 and less than d2; wherein d1 is the thickness of the solar cell, and d2 is the warping thickness of the solar cell.

As an alternative, when the pressing plate 31 presses the solar cell, the distance between the pressing plate 31 and the conveyor belt is d2, that is, the pressing plate 31 presses the solar cell flat on the conveyor belt, so as to improve the warping of the solar cell.

As can be seen from the above description, the flattening device provided by the embodiment of the application compresses the solar cell through the flattening component in the process of conveying the solar cell, so that the warping condition of the solar cell is improved, and the flatness of the solar cell is improved. In addition, when the solar cell is flattened by adopting the scheme, the size of a welding strip on the solar cell does not need to be adjusted, and the performance of the solar cell is ensured.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience in describing and simplifying the present application, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

The present application has been described above in connection with preferred embodiments, which are intended to be exemplary only and illustrative only. On the basis of the above, the present application can be subjected to various substitutions and improvements, and the substitutions and the improvements are all within the protection scope of the present application.

Claims (10)

1. A flattening apparatus, characterized by comprising:

a support assembly for supporting the back contact solar cell;

the flattening assembly comprises a pressing plate which is used for matching with the supporting assembly to tightly press the back contact solar cell; the pressing plate and the supporting assembly are arranged at intervals along a first direction; the platen is movable relative to the support assembly in the first direction;

the first direction is parallel to a direction in which the support assembly supports the back contact solar cell.

2. The flattening apparatus of claim 1, wherein said support assembly includes a conveyor belt for conveying solar cells, and a support plate located on a side of said conveyor belt facing away from said solar cells for supporting said conveyor belt; the pressing plate is positioned on one side of the conveyor belt supporting the back contact solar cell.

3. The apparatus for flattening according to claim 2, wherein said flattening assembly further includes a drive mechanism coupled to said platen and configured to drive said platen back and forth in said first direction.

4. The flattening apparatus of claim 3, wherein said flattening assembly further includes a frame disposed to one side of said conveyor; the driving mechanism is a linear module, a driving cylinder or a driving hydraulic cylinder which is fixed on the rack; a piston rod of the driving cylinder or the driving hydraulic cylinder is fixedly connected with the pressing plate; or the moving part of the linear module is fixedly connected with the pressing plate.

5. The flattening apparatus of claim 3, wherein said flattening assembly further includes a frame disposed on one side of said conveyor belt; the guide rod is arranged on the pressing plate and is in sliding connection with the rack; the driving mechanism comprises a driving motor fixed on the rack and a lead screw connected with the driving motor; the lead screw is fixedly connected with the pressing plate.

6. The flattening apparatus according to claim 2, wherein said platen has a pressing face directed toward said conveyor belt; the pressing surface is used for at least pressing the warping edge of the back contact solar cell; the length of the pressing surface along a second direction is at least greater than that of one back contact solar cell along the second direction; the length of the pressing surface along a third direction is at least greater than that of one back contact solar cell along the third direction;

wherein the second direction is a length direction in which the conveyor belt conveys the back contact solar cells; the third direction is respectively perpendicular to the first direction and the second direction; the second direction is perpendicular to the first direction.

7. The apparatus according to claim 6, wherein the pressing surface is a frame-shaped surface and the pressing surface presses against the warped edge of the back-contact solar cell.

8. The apparatus according to claim 6, wherein the length of said pressing surface in said second direction is greater than the length of said N back-contact solar cells in said second direction; wherein N is a positive integer and is more than or equal to 2.

9. The flattening apparatus according to any one of claims 1 to 8, wherein when the pressure plate presses the back-contact solar cell against the support assembly, a distance d between the pressure plate and the support assembly satisfies:

d is more than or equal to d1 and less than d2; wherein d1 is the thickness of the back contact solar cell, and d2 is the warping thickness of the back contact solar cell.

10. The flattening apparatus according to claim 2, wherein said conveyor includes a support frame, said support plate being fixedly connected to said support frame;

still including setting up the transfer gear at the support to and the suit is in the area body on the transfer gear.

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