Photovoltaic cell string repair device and repair method

Abstract

The present application provides a photovoltaic cell string repair device and maintenance method. The photovoltaic cell string repair device includes: a conveyor device and a baking device. The conveyor device is used to drive the photovoltaic cell string placed on the conveyor device to reciprocate along a first direction. The conveyor device includes independently arranged first, second, and third conveyor assemblies. The baking device is arranged toward the second conveyor assembly and is used to heat the photovoltaic cell string located on the second conveyor assembly to separate or fuse the protruding welding rods on the photovoltaic cell string with their connection points. The photovoltaic cell string repair device and maintenance method provided in the present application can solve the problems of photovoltaic cell string repair being difficult and slow in the existing photovoltaic cell string production process, requiring manual repair, and having high costs and low yields.

Description

Technical field

[0001] The present invention relates to the technical field of photovoltaic cell production and manufacturing, and in particular to a photovoltaic cell string repair device and a repair method. [Background Technology]

[0002] A photovoltaic cell string is made up of multiple photovoltaic cells welded together in sequence. Each cell is equipped with a back surface and protruding welding rods extending from the side of the back surface. Multiple cells are connected in sequence, and the protruding welding rods of each cell are connected to the back surface of the next cell. In the actual production process of solar cells, the main bottleneck of its production capacity and yield lies in the repair process of the solar cell string, especially the repair of hidden cracks.

[0003] In the existing technology, manual repair of solar cell strings is often adopted. Specifically, damaged defective cells need to be manually desoldered, and after the defective cells are removed from the cell string, good cells are welded to the cell string. This is not only inefficient and ineffective, but also has high repair costs, which is not conducive to manufacturers reducing costs and increasing efficiency. [Summary of the invention]

[0004] In view of this, the present application provides a photovoltaic cell string repair device and maintenance method to solve the problems of low efficiency and low production yield in the photovoltaic cell string repair process in the prior art.

[0005] In a first aspect, the present application provides a photovoltaic cell string repair device, comprising: a conveying device and a baking device, wherein the conveying device is used to drive the photovoltaic cell string placed on the conveying device to move back and forth in a first direction, and the conveying device comprises an independently arranged first conveying component, a second conveying component and a third conveying component; the baking device is arranged toward the second conveying component, and the baking device is used to heat the photovoltaic cell string located on the second conveying component so that the protruding welding rods of the cell pieces on the photovoltaic cell string are separated or fused from their connection parts.

[0006] In combination with the first aspect, the photovoltaic cell string repair device also includes a fixing device, which includes a press and a pressing drive connected to each other. The press is located between the baking device and the second conveying assembly, and the press is used to press the protruding welding rod and the back side of the photovoltaic cell string and the good cell for replacement.

[0007] In combination with the first aspect, the first conveying assembly and / or the third conveying assembly is provided with a lifting drive member, and the lifting drive member is used to drive the first conveying assembly and / or the third conveying assembly to move back and forth in a vertical direction, and the vertical direction is perpendicular to the first direction.

[0008] In combination with the first aspect, the first conveying assembly includes a first bottom plate, a first belt disposed around the first bottom plate, and a first driving member for driving the first belt to rotate around the first bottom plate; or,

[0009] The second conveying assembly includes a second bottom plate, a second belt disposed around the second bottom plate, and a second driving member for driving the second belt to rotate around the second bottom plate; or,

[0010] The third transmission assembly includes a third base plate, a third belt arranged around the third base plate, and a third driving member for driving the third belt to rotate around the third base plate.

[0011] In combination with the first aspect, a negative pressure suction hole is provided on at least one of the first bottom plate, the second bottom plate and the third bottom plate, and a negative pressure through hole connected to the negative pressure suction hole is provided on at least one of the first belt, the second belt and the third belt. The negative pressure suction hole is connected to an external negative pressure device, and the negative pressure suction hole is used to generate negative pressure to adsorb the photovoltaic cell string on at least one of the first belt, the second belt and the third belt.

[0012] In combination with the first aspect, the baking device includes a baking heating element and a baking lifting element connected to each other, and the baking lifting element is used to drive the baking heating element to move in a vertical direction.

[0013] In combination with the first aspect, the baking heating element includes a plurality of independently arranged lamp tubes, and the plurality of lamp tubes are arranged at intervals along the first direction.

[0014] In combination with the first aspect, the photovoltaic cell string repair device also includes a control device, which is electrically connected to the conveying device and the baking device. The control device is used to control the conveying stroke and conveying direction of the conveying device, and the control device is also used to control the switch of the baking device.

[0015] In combination with the first aspect, the length of the conveying stroke is an integer multiple of the projected length of a single cell in the photovoltaic cell string in the first direction.

[0016] In a second aspect, the present application further provides a photovoltaic cell string maintenance method, the method comprising:

[0017] Loading step: A photovoltaic cell string is composed of a plurality of cells, and the plurality of cells are connected in sequence, with the extended welding rod on each cell being connected to the back of the next cell. The photovoltaic cell string is placed on a conveyor device, and the back of the cells in the photovoltaic cell string is located on a side close to the baking device, wherein at least one defective cell exists among the plurality of cells. The conveyor device includes a first conveyor assembly, a second conveyor assembly, and a third conveyor assembly that are independently arranged and can drive the photovoltaic cell string to reciprocate in a first direction, and the baking device is arranged above the second conveyor assembly.

[0018] Desoldering step: the conveying device drives the photovoltaic cell string to move along the first direction so that the protruding welding rods and the back surface of the defective cell are located below the baking device, and the baking device heats the photovoltaic cell string to separate the protruding welding rods from their connection parts and decompose the photovoltaic cell string into a first cell string, defective cells, and a second cell string;

[0019] Welding step: The conveying device drives the first battery string and the second battery string to move, and places the good battery cell for replacement on the conveying device so that the good battery cell is in contact with the first battery string and the second battery string. The conveying device drives the protruding welding rod and the back side of the good battery cell to be located under the baking device, and the baking device heats to connect the first battery string, the good battery cell and the second battery string.

[0020] In combination with the second aspect, the desoldering step further includes:

[0021] The cell connected to the defective cell in the first cell string is a first cell, and the cell connected to the defective cell in the second cell string is a second cell, and the desoldering step further comprises: the conveying device drives the photovoltaic cell string to move along the first direction, and causes the protruding welding rod of the defective cell to be located in a baking station provided between the baking device and the second conveying assembly, and the baking device heats to separate the protruding welding rod from its connection portion and separate the defective cell from the first cell;

[0022] The conveying device drives the second battery string to move along the first direction, and makes the back side of the defective battery cell be located at the baking station. The baking device heats to disconnect the defective battery cell from the second battery cell. The third conveying component or the first conveying component drives the second battery string to move along the first direction away from the defective battery cell, so that the protruding welding rod of the second battery cell is separated from the back side of the defective battery cell.

[0023] In combination with the second aspect, the welding step further includes: the first conveyor assembly or the third conveyor assembly drives the first cell string to move so that the first cell is located at the baking station, the good cell is placed so that the welding rod extends out and abuts against the back surface of the first cell, and the baking device heats to connect the good cell to the first cell string;

[0024] The first conveying assembly or the third conveying assembly drives the first battery string to move so that the back side of the good battery cell is located at the baking station. The third conveying assembly or the first conveying assembly drives the second battery string to move in the first direction so that the protruding welding rod of the second battery cell abuts against the back side of the good battery cell. The baking device heats the good battery cell to connect it to the second battery string.

[0025] In combination with the second aspect, the fusion welding step further includes: placing the good battery cell and extending the welding rod so as to abut against the back surface of the first battery cell, and heating the baking device to connect the good battery cell to the first battery string;

[0026] The first conveying assembly or the third conveying assembly drives the first battery string to move so that the back side of the good battery cell is located at the baking station. The third conveying assembly or the first conveying assembly drives the second battery string to move in the first direction so that the protruding welding rod of the second battery cell abuts against the back side of the good battery cell. The baking device heats the good battery cell to connect it to the second battery string.

[0027] In conjunction with the second aspect, the photovoltaic cell string maintenance method further includes:

[0028] In the closing step, after the first conveyor assembly or the third conveyor assembly drives the first battery string to move so that the good battery cell to be replaced is located at the baking station, the lifting drive member drives the third conveyor assembly or the first conveyor assembly to move a distance Y in the vertical direction close to the baking device;

[0029] The third conveying assembly or the first conveying assembly drives the second battery string to move in a first direction close to the first battery string until the protruding welding rod of the second battery cell is located above the good battery cell, and the lifting drive member drives the third conveying assembly or the first conveying assembly to move a distance Y in a vertical direction away from the baking device so that the protruding welding rod of the second battery cell abuts against the back of the good battery cell.

[0030] In combination with the second aspect, the Y value is ≥0.3 mm.

[0031] In combination with the second aspect, the distance that the conveying device drives the photovoltaic cell string to move along the first direction is an integer multiple of the projection of the cell in the first direction.

[0032] In combination with the second aspect, the photovoltaic cell string maintenance method also includes: an adsorption step, when the first conveying component, the second conveying component and the third conveying component drive the first cell string, the defective cell piece and the second cell string to move, the negative pressure suction holes on the first conveying component, the second conveying component and the third conveying component are opened and the first cell string, the defective cell piece and the second cell string are adsorbed thereon.

[0033] In conjunction with the second aspect, the photovoltaic cell string repair method further includes: a pressing step, wherein when the protruding welding rod of the good cell is located below the baking device, the pressing device is activated and pushes the protruding welding rod of the good cell to press against the back of the first cell; when the back of the good cell is located below the baking device, the pressing device is activated and pushes the protruding welding rod of the second cell to press against the back of the good cell. After adopting the above technical solution, the beneficial effects are:

[0034] The photovoltaic cell string rework device and maintenance method provided in the present application performs desoldering and fusion welding operations on the photovoltaic cell string by setting a baking device, so that defective cell pieces can be removed from the photovoltaic cell string and good cell pieces can be fusion-welded together with the photovoltaic cell string. A conveying device for moving the photovoltaic cell string is also provided. The conveying device includes a separately provided first conveying component, a second conveying component and a third conveying component, so that during the desoldering operation, the defective cell pieces in the photovoltaic cell string can be transported to the baking device for heating through the conveying device to separate them from the photovoltaic cell string. During the fusion welding operation, the good cell pieces for replacement can be aligned and abutted against the photovoltaic cell string through the conveying device and conveyed to the bottom of the baking device for welding, thereby improving the degree of automation and production accuracy of the rework operation.

[0035] In summary, the photovoltaic cell string repair device and maintenance method provided in this application can solve the problems of difficult and slow repair of photovoltaic cell strings in the existing photovoltaic cell string production process, the need for manual repair, high cost and low yield.

[0036] Other features and advantages of the embodiments of the present application will be described in the subsequent description, and in part will become apparent from the description, or be understood by practicing the embodiments of the present application. The purposes and other advantages of the embodiments of the present application are achieved and obtained by the structures particularly pointed out in the description and drawings.

Brief Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0038] Figure 1 A schematic diagram of the structure of a photovoltaic cell string repair device provided in an embodiment of the present application;

[0039] Figure 2 This is a schematic diagram of the structure of the solar cell in the photovoltaic cell string in the embodiment of the present application;

[0040] Figure 3 A schematic structural diagram of a conveying device for a photovoltaic cell string repair device provided in an embodiment of the present application;

[0041] Figure 4 A schematic structural diagram of a first transmission assembly provided in an embodiment of the present application;

[0042] Figure 5 Schematic diagram of the process of repairing a photovoltaic cell string provided in an embodiment of the present application (I);

[0043] Figure 6 Schematic diagram of the process of repairing a photovoltaic cell string provided in an embodiment of the present application (II);

[0044] Figure 7 Schematic diagram of the process of repairing a photovoltaic cell string provided in an embodiment of the present application (III);

[0045] Figure 8 Schematic diagram of the process of repairing a photovoltaic cell string provided in an embodiment of the present application (IV);

[0046] Figure 9 Schematic diagram of the process of repairing a photovoltaic cell string provided in an embodiment of the present application (V);

[0047] Figure 10 Schematic diagram (VI) of the process for repairing a photovoltaic cell string provided in an embodiment of the present application.

[0048] Reference numerals:

[0049] 100- Photovoltaic cell string repair device;

[0050] 200-cell;

[0051] 210-good battery cell;

[0052] 220-defective battery cell;

[0053] 201-extending welding rod;

[0054] 202-back;

[0055] 1-Transmission device;

[0056] 11-first transmission component;

[0057] 111-first base plate; 112-first belt; 113-first driving member;

[0058] 12- second transmission component;

[0059] 121 - second base plate; 122 - second belt; 123 - second driving member;

[0060] 13- third transmission component;

[0061] 131 - third base plate; 132 - third belt; 133 - third driving member;

[0062] 14-lifting drive member;

[0063] 15-negative pressure suction hole;

[0064] 16-Negative pressure via;

[0065] 2-baking device;

[0066] 21-baking heating element;

[0067] 22-baking lifting parts;

[0068] 221-lamp tube;

[0069] 3-Fixtures;

[0070] 31-pressing tool;

[0071] 32-pressing drive member;

[0072] 4- Control device;

[0073] 5-first battery string;

[0074] 51-first battery cell;

[0075] 6- second battery string;

[0076] 61 second battery cell;

[0077] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. [Specific implementation method]

[0078] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0079] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0080] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0081] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0082] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0083] The following describes a specific embodiment of the photovoltaic cell string repair device according to the structure of the embodiment of the present application.

[0084] See also Figure 1 and Figure 2 A photovoltaic cell string consists of multiple cells 200, each of which is connected to a welding rod. A portion of the welding rod adheres to the front of the cell 200, while another portion extends from one side of the cell 200. This extended portion is referred to as the extended welding rod 201. Multiple cells 200 are connected sequentially, with the extended welding rod 201 of each cell connecting to the back 202 of the next cell. If a defective cell 220 exists in a photovoltaic cell string, it is necessary to remove the defective cell 220 from the string through a rework process. A good replacement cell 210 is then placed in its place to ensure the quality of the photovoltaic cell string.

[0085] In the prior art, photovoltaic cell strings are often repaired manually, which requires manual melting of the protruding welding rod 201 on the defective cell 220 to separate it from the photovoltaic cell string, and then the good cell 210 to be replaced is placed in the vacant position on the photovoltaic cell string after the defective cell 220 is separated, and the good cell 210 is made to abut the protruding welding rod 201 and the back side of the photovoltaic cell string. It should be noted that the abutment described in the full text describes the protruding welding rod 201 and the back side being in a state of overlapping, and the two are still in a state that can be separated at any time and are not fixed together. Finally, the protruding welding rod 201 and the back side are heated to connect the good cell 210 to the photovoltaic cell string.

[0086] The above-mentioned repair method in the prior art has low efficiency, poor precision, high cost, low yield and low degree of automation. In order to solve the above problems, the present application provides a photovoltaic cell string repair device 100, which includes a conveying device 1 and a baking device 2.

[0087] The conveying device 1 is used to drive the photovoltaic cell string placed on the conveying device 1 to move back and forth along a first direction. The conveying device 1 includes a first conveying component 11, a second conveying component 12 and a third conveying component 13 that are independently arranged;

[0088] The baking device 2 is positioned toward the second conveyor assembly 12 and is used to heat the photovoltaic cell string on the second conveyor assembly 12 to separate or fuse the protruding welding rods 201 of the photovoltaic cell 200 on the photovoltaic cell string with their connection points. It should be noted that the connection point is the back side of the next photovoltaic cell 200.

[0089] See also Figure 1 The conveying device 1 includes an independently arranged first conveying component 11, a second conveying component 12 and a third conveying component 13. The first conveying component 11, the second conveying component 12 and the third conveying component 13 can be common chain conveyors or belt conveyors driven by a motor. The first conveying component 11, the second conveying component 12 and the third conveying component 13 can all drive the photovoltaic cell strings thereon to move back and forth along a first direction. The first direction can be a horizontal direction. In this way, the photovoltaic cell strings placed on the conveying device 1 can move smoothly in the horizontal direction. The baking device 2 is arranged toward the second conveying component 12. The baking device 2 can be a heating wire, a heating lamp 221 or any device that can heat the protruding welding rod 201 to a melting temperature. The baking device 2 can only heat the position where the protruding welding rod 201 is located, that is, the strip area of the protruding welding rod 201 is heated. The heating process of the baking device 2 is the welding process of the protruding welding rod 201. The protruding welding rod 201 is melted by heating, and is fixedly connected to other positions after cooling.

[0090] There is at least one defective cell 220 in the photovoltaic cell string. Taking a defective cell 220 as an example, the photovoltaic cell string can be divided into three parts by the defective cell 220, namely: the first cell string 5, the defective cell 220 and the second cell string 6, wherein the defective cell 220 is located between the second cell string 6 and the first cell string 5, the cell of the second cell string 6 close to the defective cell 220 is the second cell 61, and the cell of the first cell string 5 close to one end of the defective cell 220 is the first cell 51.

[0091] See also Figures 5 to 10 , a specific embodiment of the photovoltaic cell string repair device 100 is given below, which mainly includes a desoldering step and a welding step;

[0092] The desoldering steps include:

[0093] In the first step, the photovoltaic cell string is placed on the conveying device 1, and the back of the cell in the photovoltaic cell string is located on the side close to the baking device 2. The conveying device 1 is started and drives the photovoltaic cell string to move along the first direction until the protruding welding rod 201 of the defective cell 220 moves to the bottom of the baking device 2.

[0094] In the second step, the baking device 2 is turned on. At this time, the protruding welding rod 201 of the defective battery cell 220 is located below the baking device 2. The protruding welding rod 201 of the defective battery cell 220 is melted by heat, and the back side of the first battery cell 51 is separated from the protruding welding rod 201 of the defective battery cell 220.

[0095] The first conveying assembly 11 and the second conveying assembly 12 drive the first battery string 5 thereon to move in a direction away from the defective battery cell 220, so that the first battery string 5 is spaced a certain distance from the defective battery cell 220 in the first direction. The spacing distance may be twice the distance of the battery cell projection in the first direction.

[0096] In the third step, the third conveying assembly 13 drives the second battery string 6 thereon to move along the first direction until the back side of the defective battery cell 220 moves to the bottom of the baking device 2 . At this time, the body of the defective battery cell 220 is located on the second conveying assembly 12 .

[0097] The baking device 2 is turned on. At this time, the back of the defective battery cell 220 is located below the baking device 2 . The protruding welding rod 201 of the second battery cell 61 is melted by heat, and the protruding welding rod 201 of the second battery cell 61 is separated from the back of the defective battery cell 220 .

[0098] In the fourth step, the third conveying component 13 drives the second battery string 6 thereon to move in a direction away from the defective battery cell 220, so that the second battery string 6 and the defective battery cell 220 are separated by a certain distance in the first direction. It should be noted that when the defective battery cell 220 is removed from the photovoltaic battery string repair device 100, the protruding welding rod 201 on the second battery cell 61 is moved away from above the defective battery cell 220, so that there is no obstruction above the defective battery cell 220, so that the defective battery cell 220 will not contact any protruding welding rod 201 when moving in the vertical direction, thereby allowing the defective battery cell 220 to be conveniently removed from the photovoltaic battery string repair device 100 by humans or robots.

[0099] It should be noted that the direction of loading the photovoltaic cell string can be from the first conveyor assembly 11 to the third conveyor assembly 13, or from the third conveyor assembly 13 to the first conveyor assembly 11. Because the first conveyor assembly 11, the second conveyor assembly 12, and the third conveyor assembly 13 can all move back and forth in the first direction, the photovoltaic cell string can be loaded from either direction, thereby improving the adaptability of the photovoltaic cell string repair device 100. The second and third steps in the above-mentioned desoldering steps can be interchanged, that is, the back side of the defective cell 220 can be desoldered first, and then the protruding welding rod 201 of the defective cell 220 can be desoldered. The order of desoldering the back side is not limited here.

[0100] The fusion welding steps include:

[0101] In the first step, the first conveying component 11 drives the first battery string 5 to move in the first direction so that the back of the first battery cell 51 is located below the baking device 2. At this time, the good battery cell 210 is placed on the third conveying component 13, and the protruding welding rod 201 of the good battery cell 210 is placed on the back of the first battery cell 51.

[0102] The baking device 2 is turned on. At this time, the back of the first battery cell 51 is located below the baking device 2 . The extended welding rod 201 of the good battery cell 210 is melted by the heat, and the good battery cell 210 is connected to the first battery string 5 .

[0103] In the second step, the first conveying component 11 and the second conveying component 12 drive the first battery string 5 to move away from the second battery string 6 until the back of the good battery cell 210 is located below the baking device 2. The third conveying component 13 drives the second battery string 6 to move toward the good battery cell 210, so that the protruding welding rod 201 of the second battery cell 61 moves to the bottom of the baking device 2 and overlaps with the back of the good battery cell 210.

[0104] The baking device 2 is turned on. At this time, the back of the good battery cell 210 is located below the baking device 2. The extended welding rod 201 of the second battery cell 61 is melted by the heat, and the good battery cell 210 is connected to the second battery string 6.

[0105] At this point, the first cell string 5, the good cell 210 and the second cell string 6 are connected into a whole, and the photovoltaic cell string repair is completed.

[0106] It should be noted that the order of the first and second steps can also be swapped, that is, the back side of the good battery cell 210 can be connected to the protruding welding rod 201 of the second battery cell 61 first, and then the protruding welding rod 201 of the good battery cell 210 can be connected to the back side of the first battery cell 51. The order of the back side welding is not limited here.

[0107] In one embodiment, the photovoltaic cell string repair device 100 also includes a fixing device 3, which includes a press 31 and a pressing drive 32 that are connected to each other. The press 31 is located between the baking device 2 and the second conveying assembly 12. The press 31 is used to press the protruding welding rod 201 and the back side that are abutted between the photovoltaic cell string and the good cell 210 for replacement.

[0108] See also Figure 1 The press 31 can be a flat positioning member or any jig that can ensure close contact between the extended welding rod 201 and the back surface. The pressing drive 32 can be a device such as a telescopic cylinder that has the ability to drive the press 31. The press 31 is located between the baking device 2 and the second conveyor assembly 12. The press 31 has at least a pressing state and a lifting state. The pressing drive 32 drives the press 31 to switch between these two states. When the baking device 2 needs to be heated, the press 31 is in the pressing state to ensure that the relative position of the extended welding rod 201 and the back surface does not move when the baking device 2 is heated. When the heating is completed, the press 31 is in the lifting state. At this time, the photovoltaic cell string can move freely on the conveyor 1.

[0109] The above arrangement allows the extended welding rod 201 to maintain close contact with the back surface during welding, thereby improving the welding accuracy.

[0110] In one embodiment, a lifting drive member 14 is provided on the first conveying component 11 and / or the third conveying component 13, and the lifting drive member 14 is used to drive the first conveying component 11 and / or the third conveying component 13 to move back and forth in a vertical direction, which is perpendicular to the first direction.

[0111] See also Figure 1The lifting drive 14 can be a device such as a telescopic cylinder. The lifting drive 14 is connected to the first conveyor assembly 11 and / or the third conveyor assembly 13 to drive the first conveyor assembly 11 and / or the third conveyor assembly 13 to move in a vertical direction perpendicular to the first direction. In this way, the first conveyor assembly 11 and / or the third conveyor assembly 13 can have a vertical height difference relative to the second conveyor assembly 12, so that the action sequence of the second step in the above-mentioned welding process can be as follows: the first conveyor assembly 11 and the second conveyor assembly 12 drive the first cell string 5 to move away from the second cell string 6 until the back side of the good cell 210 is located below the baking device 2. The lifting drive 14 drives the third conveyor assembly 13 to rise so that the protruding welding rod 201 of the second cell 61 is vertically higher than the back side of the good cell 210. The third conveyor assembly 13 drives the second cell string 6 to move toward the good cell 210, so that the extended welding rod 201 of the second cell 61 moves to the bottom of the baking device 2 and is located directly above the back of the good cell 210. The lifting drive 14 drives the third conveyor assembly 13 downward, so that the extended welding rod 201 of the second cell 61 overlaps the back of the good cell 210. This ensures that the extended welding rod 201 of the second cell 61 naturally falls during the process of overlapping the back of the good cell 210, preventing the extended welding rod 201 from interfering with the body of the good cell 210 during the parallel movement, causing the extended welding rod 201 to deviate or become misaligned. It should be noted that the above-mentioned action process can also be a simultaneous process in which the lifting drive 14 drives the third conveyor assembly 13 downward and the third conveyor assembly 13 drives the second cell string 6 toward the good cell 210, thereby saving overall action time and improving work efficiency. The above-described process is illustrated by taking the movement of the photovoltaic cell string along the first conveying component 11 to the third conveying component 13 as an example. It can be understood that when the loading direction of the photovoltaic cell string is reversed, that is, when the photovoltaic cell string moves along the third conveying component 13 to the first conveying component 11, the lifting drive 14 drives the first conveying component 11 to move in the vertical direction. The specific action process will not be repeated here.

[0112] Similarly, through the above-mentioned arrangement, the action sequence of the second step in the above-mentioned desoldering step can be as follows: the first conveying component 11 and the second conveying component 12 drive the first battery string 5 thereon to move in a direction away from the defective battery cell 220, and at the same time, the lifting drive component 14 drives the third conveying component 13 to rise to drive the protruding welding rod 201 of the defective battery cell 220 to detach from the first battery string 5, or the lifting drive component 14 drives the third conveying component 13 to rise to drive the protruding welding rod 201 of the defective battery cell 220 to detach from the first battery string 5. This action precedes the first conveying component 11 and the second conveying component 12 driving the first battery string 5 thereon to move in a direction away from the defective battery cell 220.

[0113] Obviously, in this process, because there is a certain height difference between the protruding welding rod 201 of the defective battery cell 220 and the first battery string 5, friction or collision between the protruding welding rod 201 of the defective battery cell 220 and the first battery string 5 is avoided, which causes deformation of the protruding welding rod 201.

[0114] It can be understood that the above-mentioned action is also applicable to the fourth step in the desoldering process, that is, when the third conveying component 13 drives the second battery string 6 thereon to move in a direction away from the defective battery cell 220, the lifting drive member 14 can also be used to drive the third conveying component 13 to rise to prevent the protruding welding rod 201 of the second battery cell 61 from rubbing or colliding with the defective battery cell 220.

[0115] In one embodiment, the first conveying assembly 11 includes a first base plate 111, a first belt 112 disposed around the first base plate 111, and a first driving member 113 for driving the first belt 112 to rotate around the first base plate 111; or,

[0116] The second conveying assembly 12 includes a second bottom plate 121, a second belt 122 disposed around the second bottom plate 121, and a second driving member 123 for driving the second belt 122 to rotate around the second bottom plate 121; or,

[0117] The third conveying assembly 13 includes a third base plate 131 , a third belt 132 disposed around the third base plate 131 , and a third driving member 133 for driving the third belt 132 to rotate around the third base plate 131 .

[0118] See also Figure 3 The above-mentioned setting adopts a base plate, a belt and a driving member to form a first transmission component 11, a second transmission component 12 or a third transmission component 13. It has a simple structure and high transmission accuracy, which can reduce maintenance costs and improve production efficiency.

[0119] In one embodiment, a negative pressure suction hole 15 is provided on at least one of the first base plate 111, the second base plate 121 and the third base plate 131, and a negative pressure through hole 16 connected to the negative pressure suction hole 15 is provided on at least one of the first belt 112, the second belt 122 and the third belt 132. The negative pressure suction hole 15 is connected to an external negative pressure device, and the negative pressure suction hole 15 is used to generate negative pressure to adsorb the photovoltaic cell string on at least one of the first belt 112, the second belt 122 and the third belt 132.

[0120] See also Figure 4 Taking the first bottom plate 111 and the first belt 112 as an example, the first bottom plate 111 is provided with a plurality of negative pressure suction holes 15, which are connected to an external negative pressure device so that negative pressure can be formed at the negative pressure suction holes 15. The negative pressure device can be a common vacuum pump, etc. The first belt 112 is provided with a plurality of negative pressure through holes 16, which is wound around the first bottom plate 111. During the movement of the first belt 112 around the first bottom plate 111, at least one negative pressure through hole 16 is always kept in communication with the negative pressure suction hole 15. The above effects can be achieved by controlling the spacing between the multiple negative pressure suction holes 15 opened on the first base plate 111 and the spacing between the multiple negative pressure through holes 16 opened on the first belt 112. In addition, the negative pressure through holes 16 or the negative pressure suction holes 15 can also be set as strip holes. In this way, when the first belt 112 moves around the first base plate 111, it can still ensure that negative pressure can be formed at the negative pressure suction holes 15 to adsorb the photovoltaic cell string on the belt, thereby improving the transmission accuracy of the photovoltaic cell string.

[0121] In one embodiment, the baking device 2 includes a baking heating element 21 and a baking lifting element 22 that are connected to each other. The baking lifting element 22 is used to drive the baking heating element 21 to move in a vertical direction.

[0122] See also Figure 1 The baking heating element 21 can be a heating lamp 221, and the baking lifting element 22 can be a telescopic cylinder. The baking lifting element 22 can adjust the distance between the baking heating element 21 and the second conveyor assembly 12, thereby accurately adjusting the amount of heat radiated from the baking heating element 21 to the solar cell string, and further accurately controlling the melting rate of the welding rod 201 extending from the solar cell string. In this way, when facing different types of photovoltaic cell strings, the distance between the baking heating element 21 and the second conveyor assembly 12 can be adjusted according to actual conditions to control the melting rate of the extending welding rod 201. In addition, at the end of baking, the baking lifting element 22 can lift the baking heating element 21 to increase the distance between it and the second conveyor assembly 12, thereby playing a role of avoiding position, making it easier for the conveyor device 1 to transport the photovoltaic cell string along the first direction.

[0123] In one embodiment, the baking heating element 21 includes a plurality of independently arranged lamp tubes 221 , and the plurality of lamp tubes 221 are spaced apart along the first direction.

[0124] Multiple lamp tubes 221 can ensure more uniform heat radiation. More importantly, the provision of multiple lamp tubes 221 can adapt to different models and sizes of photovoltaic cell strings. When the cells in the photovoltaic cell string are relatively wide, multiple lamp tubes 221 are turned on based on the size of the cell projection on the baking device 2. It can be understood that when the cells in the photovoltaic cell string are relatively narrow, the number of lamp tubes 221 turned on can be reduced. This saves energy and improves the adaptability of the photovoltaic cell string repair device 100.

[0125] In one embodiment, the photovoltaic cell string repair device 100 also includes a control device 4, which is electrically connected to the conveying device 1 and the baking device 2. The control device 4 is used to control the conveying stroke and conveying direction of the conveying device 1. The control device 4 is also used to control the switch of the baking device 2.

[0126] See also Figure 1 The control device 4 can be a common PLC controller, a single-chip microcomputer controller or a computer device. The control device 4 controls the conveying stroke and conveying direction of the conveying device 1 according to actual conditions, and also controls parameters such as the switch of the baking device 2 to achieve intelligence and automation.

[0127] In one embodiment, the length of the transport stroke is an integer multiple of the projected length of a single cell in the photovoltaic cell string in the first direction.

[0128] The unit conveying distance of the photovoltaic cell string transported by the conveying device 1 is an integer multiple of the projected length of a single cell in the first direction. Taking the projected length of a single cell in the first direction as X, the distance that the first conveying component 11, the second conveying component 12 and the third conveying component 13 in the conveying device 1 convey the photovoltaic cell string (including the first cell string 5 and the second cell string 6 decomposed from the photovoltaic cell string) thereon each time is an integer multiple of X. In this way, the conveying accuracy is improved, so that the protruding welding rod 201 on the photovoltaic cell string can be accurately overlapped with the back side.

[0129] See also Figures 5 to 10 In one embodiment, a photovoltaic cell string repair method includes:

[0130] Loading step: placing a photovoltaic cell string on a conveyor 1 with the backside of the cells in the photovoltaic cell string positioned near a baking device 2, wherein at least one defective cell 220 is present among the plurality of cells. The conveyor 1 includes a first conveyor assembly 11, a second conveyor assembly 12, and a third conveyor assembly 13, which are independently arranged and capable of driving the photovoltaic cell string to reciprocate in a first direction. The baking device 2 is disposed above the second conveyor assembly 12.

[0131] Desoldering step: The conveyor 1 drives the photovoltaic cell string in a first direction so that the protruding welding rod 201 and the back surface of the defective cell 220 are located below the baking device 2. The baking device 2 heats the photovoltaic cell string to separate the protruding welding rod from its connection point, thereby decomposing the photovoltaic cell string into the first cell string 5, the defective cell 220, and the second cell string 6.

[0132] Welding step: The conveying device 1 drives the first battery string 5 and the second battery string 6 to move, and places the good battery cell 210 for replacement on the conveying device 1 so that the good battery cell 210 is in contact with the first battery string 5 and the second battery string 6. The conveying device 1 drives the protruding welding rod 201 of the good battery cell 210 and the back side to be located under the baking device 2, and the baking device 2 is heated to connect the first battery string 5, the good battery cell 210 and the second battery string 6.

[0133] In one embodiment, the desoldering step further includes: the cell connected to the defective cell 220 in the second cell string 6 is the second cell 61, the cell connected to the defective cell 220 in the first cell string 5 is the first cell 51, the conveying device 1 drives the photovoltaic cell string to move along the first direction, and makes the protruding welding rod 201 of the defective cell 220 be located in a baking station provided between the baking device 2 and the second conveying assembly 12, and the baking device 2 is heated to separate the protruding welding rod from its connection portion and disconnect the defective cell 220 from the first cell 51;

[0134] The conveying device 1 drives the second battery string 6 to move in the first direction, and makes the back of the defective battery cell 220 located at the baking station. The baking device 2 heats to disconnect the defective battery cell 220 from the second battery cell 61. The third conveying component 13 drives the second battery string 6 to move in the direction away from the defective battery cell 220, so that the protruding welding rod 201 of the second battery cell 61 is separated from the back of the defective battery cell 220.

[0135] In one embodiment, the welding step further includes: the first conveying assembly 11 drives the first battery string 5 to move so that the first battery cell 51 is located at the baking station, the good battery cell 210 is placed and the welding rod 201 is extended to abut against the back surface of the first battery cell 51, and the baking device 2 is heated to connect the good battery cell 210 to the first battery string 5;

[0136] The first conveying assembly 11 drives the first battery string 5 to move so that the back of the good battery cell 210 is located at the baking station. The third conveying assembly 13 drives the second battery string 6 to move in the first direction so that the extended welding rod 201 of the second battery cell 61 abuts against the back of the good battery cell 210. The baking device 2 heats the good battery cell 210 to connect it to the second battery string 6.

[0137] The following is a first embodiment of a photovoltaic cell string maintenance method:

[0138] The loading steps include:

[0139] See also Figure 5 , placing a photovoltaic cell string on a conveyor 1 so that the backside of the cells in the photovoltaic cell string is located on a side close to the baking device 2, wherein at least one defective cell 220 exists among the plurality of cells. The conveyor 1 includes a first conveyor assembly 11, a second conveyor assembly 12, and a third conveyor assembly 13 that are independently arranged and can drive the photovoltaic cell string to reciprocate in a first direction. The baking device 2 is arranged above the second conveyor assembly 12;

[0140] The desoldering steps include:

[0141] See also Figure 6 The photovoltaic cell string is placed on the conveyor 1, with the back surfaces of the cells in the photovoltaic cell string located near the baking device 2. The conveyor 1 is activated and drives the photovoltaic cell string in a first direction until the protruding welding rod 201 of the defective cell 220 moves below the baking device 2. The baking device 2 is opened, and the protruding welding rod 201 of the defective cell 220 is located below the baking device 2. The protruding welding rod 201 of the defective cell 220 is heated and melted, separating the back surface of the first cell 51 from the protruding welding rod 201 of the defective cell 220.

[0142] The first and second conveyor assemblies 11 and 12 drive the first battery string 5 thereon to move in a direction away from the defective battery cell 220, so that the first battery string 5 is separated from the defective battery cell 220 by a certain distance in the first direction. This distance can be twice the distance of the battery cell's projection in the first direction. The third conveyor 13 drives the second battery string 6 thereon to move in the first direction until the back surface of the defective battery cell 220 moves below the baking device 2. At this point, the body of the defective battery cell 220 is located on the second conveyor 12.

[0143] See also Figure 7 and Figure 8, open the baking device 2, at this time the back of the defective battery cell 220 is located below the baking device 2, the extended welding rod 201 of the second battery cell 61 is melted by heat, and the extended welding rod 201 of the second battery cell 61 is separated from the back of the defective battery cell 220.

[0144] The third conveying assembly 13 drives the second battery string 6 thereon to move in a direction away from the defective battery cell 220, so that the second battery string 6 is spaced a certain distance from the defective battery cell 220 in the first direction, so as to facilitate manual or robotic removal of the defective battery cell 220 from the photovoltaic battery string repair device 100.

[0145] The fusion welding steps include:

[0146] See also Figure 9 The first conveying assembly 11 drives the first battery string 5 to move along the first direction, so that the back of the first battery cell 51 is located below the baking device 2. At this time, the good battery cell 210 is placed on the third conveying assembly 13, and the protruding welding rod 201 of the good battery cell 210 is placed on the back of the first battery cell 51.

[0147] The baking device 2 is turned on. At this time, the back of the first battery cell 51 is located below the baking device 2 . The extended welding rod 201 of the good battery cell 210 is melted by the heat, and the good battery cell 210 is connected to the first battery string 5 .

[0148] See also Figure 10 The first conveying assembly 11 and the second conveying assembly 12 drive the first battery string 5 to move away from the second battery string 6 until the back of the good battery cell 210 is located below the baking device 2. The third conveying assembly 13 drives the second battery string 6 to move toward the good battery cell 210, so that the extended welding rod 201 of the second battery cell 61 moves to the bottom of the baking device 2 and overlaps with the back of the good battery cell 210.

[0149] The baking device 2 is turned on. At this time, the back of the good battery cell 210 is located below the baking device 2. The extended welding rod 201 of the second battery cell 61 is melted by the heat, and the good battery cell 210 is connected to the second battery string 6.

[0150] At this point, the first cell string 5, the good cell 210 and the second cell string 6 are connected into a whole, and the photovoltaic cell string repair is completed.

[0151] In one embodiment, the photovoltaic cell string maintenance method further includes:

[0152] In the closing step, the lifting drive 14 is connected to the third conveyor assembly 13 and is used to drive the third conveyor assembly 13 to move in the vertical direction. After the first conveyor assembly 11 drives the first battery string 5 to move so that the good battery cell 210 for replacement is located at the baking station, the lifting drive 14 drives the third conveyor assembly 13 to move a distance Y in the vertical direction close to the baking device 2.

[0153] The third conveying assembly 13 drives the second battery string 6 to move along the first direction close to the first battery string 5 until the protruding welding rod 201 of the second battery cell 61 is located above the good battery cell 210, and the lifting drive 14 drives the third conveying assembly 13 to move a distance Y in the vertical direction away from the baking device 2, so that the protruding welding rod 201 of the second battery cell 61 abuts against the back of the good battery cell 210.

[0154] It should be noted that when the loading direction of the photovoltaic cell string is moving from the third conveying component 13 to the first conveying component 11, the lifting drive 14 is connected to the first conveying component 11, and the lifting drive 14 is used to drive the first conveying component 11 to move in the vertical direction. After the third conveying component 13 drives the first cell string 5 to move so that the good cell 210 for replacement is located at the baking station, the lifting drive 14 drives the first conveying component 11 to move a distance Y in the vertical direction close to the baking device 2.

[0155] The following is a second embodiment of a photovoltaic cell string maintenance method:

[0156] See also Figure 1 and Figure 10 Compared to Example 1, the photovoltaic cell string repair method of Example 2 adds a closing step. The remaining steps are identical, with the difference being that during the welding step, when the backside of the good cell 210 is located below the baking device 2, the third conveyor assembly 13 does not directly drive the second cell string 6 toward the good cell 210. Instead, before the third conveyor assembly 13 drives the second cell string 6 toward the good cell 210, a step is added in which the lifting drive 14 drives the third conveyor assembly 13 upward. This action creates a height difference Y between the second cell string 6 and the good cell 210. This difference is greater than the sum of the thickness of the good cell 210 and the thickness of the extended welding rod 201. In one embodiment, the value Y is ≥ 0.3 mm. Subsequently or simultaneously, the third conveyor assembly 13 drives the second cell string 6 toward the good cell 210. Finally, the lifting drive 14 drives the third conveyor assembly 13 downward, allowing the extended welding rod 201 of the second cell 61 to move below the baking device 2 and overlap the backside of the good cell 210.

[0157] The above closing steps reduce the risk of interference between the welding rods 201 extending from the cell and the back of the cell during the overlap, thereby improving the accuracy and success rate of the connection between the second cell string 6 and the good cell 210.

[0158] In one embodiment, the distance that the conveyor 1 drives the photovoltaic cell string to move along the first direction is an integer multiple of the projection of the cell in the first direction. It can be understood that, for the same purpose as described above, if the distance of the projection length of a single cell in the first direction is X, then the distance that the first conveyor assembly 11, the second conveyor assembly 12, and the third conveyor assembly 13 in the conveyor 1 each transport the photovoltaic cell string (including the first cell string 5 and the second cell string 6 decomposed from the photovoltaic cell string) is an integer multiple of X. In this way, the conveying accuracy is improved, so that the protruding welding rod 201 on the photovoltaic cell string can be accurately separated and overlapped with the back surface.

[0159] In one embodiment, the photovoltaic cell string maintenance method adds an adsorption step. When the first conveying component 11, the second conveying component 12 and the third conveying component 13 drive the first cell string 5, the defective cell 220 and the second cell string 6 to move, the negative pressure suction holes 15 on the first conveying component 11, the second conveying component 12 and the third conveying component 13 are opened and the first cell string 5, the defective cell 220 and the second cell string 6 are adsorbed thereon.

[0160] It can be understood that the above-mentioned negative pressure suction holes 15 connected to the external negative pressure equipment can be set on the above-mentioned first conveying component 11, the second conveying component 12 and the third conveying component 13, so as to achieve the purpose of the first conveying component 11, the second conveying component 12 and the third conveying component 13 adsorbing the first battery string 5, the defective battery cell 220 and the second battery string 6 thereon, thereby improving the transmission accuracy of the photovoltaic battery string.

[0161] In one embodiment, a photovoltaic cell string repair method adds a pressing step. When the protruding welding rod 201 of the good cell 210 is located below the baking device 2, the pressing device is activated and pushes the protruding welding rod 201 of the good cell 210 to press against the back of the first cell 51.

[0162] When the back side of the good battery cell 210 is located below the baking device 2 , the pressing device is activated and pushes the extended welding rod 201 of the second battery cell 61 to press against the back side of the good battery cell 210 .

[0163] It is understood that the clamping device can be the aforementioned fixing device 3 or a common lever clamping cylinder for fixing a workpiece. The fixing device 3 includes a mutually connected pressing tool 31 and a pressing driving member 32. The pressing tool 31 is located between the baking device 2 and the second conveying assembly 12. The pressing tool 31 is used to press the extended welding rod 201 and the back surface of the photovoltaic cell string and the good replacement cell 210. This arrangement allows the extended welding rod 201 to maintain close contact with the back surface during welding, thereby improving the accuracy of welding.

[0164] In summary, the photovoltaic cell string repair method provided in the present application can solve the problems of low efficiency and low production yield in the photovoltaic cell string repair process in the prior art.

[0165] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A photovoltaic cell string repair device, characterized in that: include: A conveying device (1), the conveying device (1) is used to drive a photovoltaic cell string placed on the conveying device (1) to move back and forth along a first direction, the conveying device (1) comprising a first conveying component (11), a second conveying component (12) and a third conveying component (13) which are independently arranged; and a baking device (2), the baking device (2) being arranged toward the second conveying assembly (12), The photovoltaic cell string comprises a plurality of solar cells (200), adjacent solar cells in the plurality of solar cells (200) are connected via welding rods, the plurality of solar cells (200) comprise a first cell (51), a second cell (61), and a defective cell (220) between the first cell (51) and the second cell (61), the back side (202) of the first cell (51) is connected to a protruding welding rod (201) of the first welding rod, another part of the first welding rod is connected to a front side of the defective cell (220), the back side (202) of the defective cell (220) is connected to a protruding welding rod (201) of the second welding rod, and another part of the second welding rod is connected to the front side of the second cell (61); The conveying device (1) moves the first battery cell (51) onto the second conveying assembly (12), and the baking device (2) heats the first battery cell (51) and the protruding welding rod (201) of the first welding rod, so that the defective battery cell (220) is separated from the first battery cell (51); The conveying device (1) moves the defective battery cell (220) onto the second conveying assembly (12), and the baking device (2) heats the defective battery cell (220) and the extended welding rod (201) of the second welding rod, so that the defective battery cell (220) is disconnected from the second battery cell (61). The conveying device (1) moves the first battery cell (51) onto the second conveying assembly (12), the baking device (2) heats the first battery cell (51) and the protruding welding rod (201) of another welding rod, and another part of the other welding rod is connected to the front of the replacement battery cell, so that the first battery cell (51) is connected to the replacement battery cell, the conveying device (1) moves the replacement battery cell onto the second conveying assembly (12), and the baking device (2) heats the replacement battery cell and the protruding welding rod (201) of the second welding rod, so that the replacement battery cell is connected to the second battery cell (61).

2. The photovoltaic cell string repair device according to claim 1, characterized in that: The photovoltaic cell string repair device further comprises a fixing device (3), wherein the fixing device (3) comprises a pressing tool (31) and a pressing drive member (32) connected to each other, wherein the pressing tool (31) is located between the baking device (2) and the second conveying assembly (12), and the pressing tool (31) is used to press the protruding welding rod and the back surface of the photovoltaic cell string and the good cell to be replaced.

3. The photovoltaic cell string repair device according to claim 1, characterized in that: The first conveying assembly (11) and / or the third conveying assembly (13) is provided with a lifting drive member (14), and the lifting drive member (14) is used to drive the first conveying assembly (11) and / or the third conveying assembly (13) to move back and forth in a vertical direction, wherein the vertical direction is perpendicular to the first direction.

4. The photovoltaic cell string repair device according to claim 1, characterized in that: The first conveying assembly (11) comprises a first base plate (111), a first belt (112) arranged around the first base plate (111), and a first driving member (113) for driving the first belt (112) to rotate around the first base plate (111); or, The second conveying assembly (12) comprises a second bottom plate (121), a second belt (122) arranged around the second bottom plate (121), and a second driving member (123) for driving the second belt (122) to rotate around the second bottom plate (121); or, The third transmission assembly (13) comprises a third base plate (131), a third belt (132) arranged around the third base plate (131), and a third driving member (133) for driving the third belt (132) to rotate around the third base plate (131).

5. The photovoltaic cell string repair device according to claim 4, characterized in that: A negative pressure suction hole (15) is provided on at least one of the first bottom plate (111), the second bottom plate (121) and the third bottom plate (131); a negative pressure through hole (16) connected to the negative pressure suction hole (15) is provided on at least one of the first belt (112), the second belt (122) and the third belt (132); the negative pressure suction hole (15) is connected to an external negative pressure device; and the negative pressure suction hole (15) is used to generate negative pressure to adsorb the photovoltaic cell string on at least one of the first belt (112), the second belt (122) and the third belt (132).

6. The photovoltaic cell string repair device according to claim 1, characterized in that: The baking device (2) comprises a baking heating element (21) and a baking lifting element (22) which are connected to each other, and the baking lifting element (22) is used to drive the baking heating element (21) to move in a vertical direction.

7. The photovoltaic cell string repair device according to claim 6, characterized in that: The baking heating element (21) comprises a plurality of independently arranged lamp tubes (221), and the plurality of lamp tubes (221) are arranged at intervals along the first direction.

8. The photovoltaic cell string repair device according to claim 1, characterized in that: The photovoltaic cell string repair device further comprises a control device (4), wherein the control device (4) is electrically connected to the conveying device (1) and the baking device (2), and the control device (4) is used to control the conveying stroke and conveying direction of the conveying device (1), and the control device (4) is also used to control the switch of the baking device (2).

9. A photovoltaic cell string maintenance method, characterized in that: The method comprises: Loading step: a photovoltaic cell string includes a plurality of solar cells (200), adjacent solar cells in the plurality of solar cells (200) are connected by welding rods, the photovoltaic cell string is placed on a conveying device (1), and the back sides of the cells in the photovoltaic cell string are located on a side close to a baking device (2), wherein the plurality of solar cells (200) include a first cell (51), a second cell (61), and a defective cell (220) between the first cell (51) and the second cell (61), and the back side of the first cell (51) is located on a side close to a baking device (2). (202) is connected to the protruding welding rod (201) of the first welding rod, another part of the first welding rod is connected to the front of the defective battery cell (220), the back (202) of the defective battery cell (220) is connected to the protruding welding rod (201) of the second welding rod, another part of the second welding rod is connected to the front of the second battery cell (61), the conveying device (1) includes a first conveying component (11), a second conveying component (12) and a third conveying component (13) which are independently arranged and can drive the photovoltaic battery string to move back and forth along the first direction, and the baking device (2) is arranged above the second conveying component (12); Desoldering step: the conveying device (1) drives the photovoltaic cell string to move along the first direction so that the protruding welding rod (201) of the first welding rod of the defective cell and the back side (202) of the first cell (51) are located below the baking device, the baking device is heated so that the defective cell (220) is separated from the first cell (51), and the conveying device (1) drives the photovoltaic cell string to move along the first direction so that the protruding welding rod (201) of the second welding rod and the back side (202) of the defective cell (220) can be located below the baking device (2), and the baking device (2) is heated so that the defective cell (220) is disconnected from the second cell (61), and the photovoltaic cell string is decomposed into a first cell string (5) including the first cell (51), the defective cell (220) and the second cell string (6) including the second cell (61); and welding step: the conveying device (1) drives the first cell string (5) and the second battery string (6) are moved, and the replacement battery cell is placed on the conveying device (1) so that the replacement battery cell abuts the first battery string (5) and the second battery string (6), the conveying device (1) drives the extended welding rod (201) of another welding rod connected to the replacement battery cell and the back of the first battery cell (51) to be located below the baking device (2), the baking device heats to connect the replacement battery cell and the first battery string (5), the first conveying component (11) drives the first battery string (5) to move so that the back of the replacement battery cell is located below the baking device (2), the third conveying component (13) drives the second battery string (6) to move in the first direction so that the extended welding rod (201) of the second welding rod is located below the baking device (2) and abuts the back of the replacement battery cell, and the baking device (2) heats to connect the replacement battery cell and the second battery string (6).

10. The photovoltaic cell string maintenance method according to claim 9, characterized in that: Also includes: In a closing step, the first conveying assembly (11) drives the first battery string to move so that the replacement battery cell is located below the baking device (2), and the lifting drive member drives the third conveying assembly (13) to move a distance Y in a vertical direction close to the baking device; The third conveying assembly (13) drives the second battery string (6) to move in a first direction toward the first battery string (5) until the protruding welding rod of the second battery cell is located above the replacement battery cell, and the lifting drive member drives the third conveying assembly (13) to move a distance Y in a vertical direction away from the baking device, so that the protruding welding rod of the second welding rod abuts against the back of the replacement battery cell.

11. The photovoltaic cell string maintenance method according to claim 10, characterized in that: The Y value is ≥0.3 mm.

12. The photovoltaic cell string maintenance method according to claim 9, characterized in that: The distance that the conveying device drives the photovoltaic cell string to move along the first direction is an integer multiple of the projection of the cell in the first direction.

13. The photovoltaic cell string maintenance method according to claim 9, characterized in that: Also includes: Adsorption step: when the first conveying component (11), the second conveying component (12) and the third conveying component (13) drive the first battery string (5), the defective battery cell (220) and the second battery string (6) to move, the negative pressure suction holes (15) on the first conveying component (11), the second conveying component (12) and the third conveying component (13) are opened and the first battery string (5), the defective battery cell (220) and the second battery string (6) are adsorbed thereon.

14. The photovoltaic cell string maintenance method according to claim 9, characterized in that: Also includes: a pressing step, wherein when the protruding welding rod of the other welding rod of the replacement battery cell is located below the baking device (2), the pressing device is activated and pushes the protruding welding rod of the other welding rod of the replacement battery cell to press against the back side of the first battery cell; When the back side of the replacement battery cell is located below the baking device (2), the pressing device is activated and pushes the extended welding rod of the second welding rod to press against the back side of the replacement battery cell.

Images