Battery string preparation method and equipment thereof

Abstract

The invention relates to the technical field of photovoltaic module manufacturing, and particularly discloses a battery string preparation method and equipment. The preparation method of the battery string comprises the following steps: preparing a battery piece assembly; the battery piece assembly comprises a battery piece, a welding strip group and a first adhesive film, each welding strip in the welding strip group comprises a first welding strip section positioned on the battery piece and a second welding strip section extending out of the battery piece, and the first welding strip section is fixed on the battery piece through the first adhesive film; the battery piece assemblies are turned over and carried to a bunching conveying platform, and the second welding strip sections of the battery piece assemblies are put on the battery pieces of the previous battery piece assemblies in a lap joint mode; a second adhesive film is attached to the previous battery piece assembly so as to fix a second welding strip section lapped on the battery piece; and repeating the steps to obtain a battery string in which a plurality of battery piece assemblies are connected in parallel. According to the battery string preparation method and equipment, the battery string preparation process can be simplified, and the string forming efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic module manufacturing, and particularly relates to a method and equipment for preparing a battery string. Background Art

[0002] In the field of photovoltaic module manufacturing, common methods for connecting the solder tapes of main-grid-free solar cells include welding connection, dispensing connection, film strip connection, etc. Since the welding connection method has a high cost and the dispensing connection method has poor electrical conductivity, the film strip connection method is generally favored in the industry.

[0003] In the process of connecting main-grid-free solar cells and solder tapes by the film strip connection method, not only the solder tapes on the front side of the solar cells need to be covered with film for connection, but also the solder tapes connected to the back side of the solar cells need to be covered with film and connected to the solar cells. For example, the patent with the publication number CN118213437A discloses a method for preparing a battery string. First, a plurality of solar cell modules are prepared, and then the solar cell modules are arranged according to the stringing rules, so that the second solder tape section of the latter solar cell module is laid on the solar cell of the previous solar cell module; then, a glue film with a plurality of glue dots is attached, so that the second solder tape section is bonded to the solar cell through at least two glue dots; finally, the glue dots are cured to obtain the battery string. However, the problem with this method for preparing a battery string is that both the preparation process of the solar cell module and the preparation process of the entire battery string are relatively cumbersome, and the stringing efficiency needs to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and equipment for preparing a battery string, which can simplify the battery string preparation process and improve the stringing efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: A method for preparing a battery string, comprising the following steps: Prepare a solar cell module; the solar cell module includes a solar cell, a solder tape group, and a first glue film. Each solder tape in the solder tape group includes a first solder tape section located on the solar cell and a second solder tape section extending out of the solar cell, and the first solder tape section is fixed on the solar cell through the first glue film; Flip and transport the solar cell module to the stringing transport platform, and make the second solder tape section of the solar cell module rest on the solar cell of the previous solar cell module; Attach a second glue film to the previous solar cell module to fix the second solder tape section resting on the solar cell; Repeat the above steps to obtain a battery string in which a plurality of solar cell modules are connected in parallel.

[0006] As a preference of the present invention, attaching a second glue film to the previous solar cell module to fix the second solder tape section resting on the solar cell includes: Use a solder tape clamp to position and press each second solder tape segment placed on the solar cell of the previous solar cell assembly. Attach a second adhesive film to the part of each second solder tape segment that is not pressed by the solder tape clamp. Recover the solder tape clamp. Attach a second adhesive film to the part of each second solder tape segment that is pressed by the solder tape clamp.

[0007] As a preference of the present invention, to fix the second solder tape segments placed on the solar cell by attaching a second adhesive film to the previous solar cell assembly, it further includes pre-preparing at least two segments of the second adhesive film arranged along the length direction, and the sum of the lengths of each segment of the second adhesive film is equal to or slightly less than the length of the solar cell.

[0008] As a preference of the present invention, before flipping and transporting the solar cell assembly to the series transportation platform, place the solder tape clamp on the series transportation platform, and each clamping head of the solder tape clamp is located above the solar cell and remains open; after flipping the solar cell assembly onto the series transportation platform, each clamping head of the solder tape clamp clamps and fixes the corresponding second solder tape segment.

[0009] As a preference of the present invention, heat the solar cell located on the series transportation platform before attaching the second adhesive film; cool the solar cell located on the series transportation platform after attaching the second adhesive film.

[0010] As a preference of the present invention, before cooling the solar cell located on the series transportation platform, roll-press the attached second adhesive film so that the second adhesive film is tightly bonded to the solar cell.

[0011] As a preference of the present invention, preparing the solar cell assembly includes: The composite platform moves to the first station, and place the solar cell on the composite platform; The composite platform moves to the second station, and place the solder tape group on the solar cell; The composite platform moves to the third station, and attach a first adhesive film to each first solder tape segment located on the solar cell, so that the first solder tape segment is fixed on the solar cell through the first adhesive film, thereby obtaining the solar cell assembly; The composite platform moves to the fourth station, and move the solar cell assembly away from the composite platform.

[0012] As a preference of the present invention, heat the solar cell during the movement of the composite platform.

[0013] A battery string preparation device, including a series transportation platform, a solar cell assembly preparation device, a flipping mechanism and a second adhesive film handling mechanism; The device for preparing the solar cell module can prepare the solar cell module; the solar cell module includes a solar cell, a solder ribbon group and a first encapsulant film. Each solder ribbon in the solder ribbon group includes a first solder ribbon segment located on the solar cell and a second solder ribbon segment extending out of the solar cell. The first solder ribbon segment is fixed on the solar cell through the first encapsulant film; The flipping and transporting mechanism can flip and transport the solar cell module prepared by the device for preparing the solar cell module onto the series transportation platform, and make the second solder ribbon segment of the solar cell module rest on the solar cell of the previous solar cell module; The second encapsulant film attaching mechanism can attach a second encapsulant film on the previous solar cell module to fix the second solder ribbon segment resting on the solar cell.

[0014] Preferably, the present invention further includes a solder ribbon press tool and a solder ribbon press tool transporting mechanism. The solder ribbon press tool can position and press each second solder ribbon segment resting on the solar cell of the previous solar cell module; the solder ribbon press tool transporting mechanism can transport the solder ribbon press tool onto the series transportation platform and recycle the solder ribbon press tool; There are two second encapsulant film transporting mechanisms. The first second encapsulant film transporting mechanism can attach a second encapsulant film to the part of each second solder ribbon segment that is not pressed by the solder ribbon press tool, and the second second encapsulant film transporting mechanism can attach a second encapsulant film to the part of each second solder ribbon segment that is pressed by the solder ribbon press tool.

[0015] The beneficial effects of the present invention are as follows: 1. By first preparing the solar cell module, then flipping and transporting the solar cell module onto the series transportation platform, making the second solder ribbon segment of the solar cell module rest on the solar cell of the previous solar cell module, and then attaching a second encapsulant film to fix the second solder ribbon segment resting on the solar cell, the present invention realizes connecting a plurality of solar cell modules in series. The series connection process is simple and efficient.

[0016] 2. First, the present invention uses a solder ribbon press tool to position and press each second solder ribbon segment resting on the solar cell of the previous solar cell module, and then attaches a second encapsulant film to the part of each second solder ribbon segment that is not pressed by the solder ribbon press tool; after recycling the solder ribbon press tool, then attach a second encapsulant film to the part of each second solder ribbon segment that is pressed by the solder ribbon press tool, thereby realizing the precise series connection between adjacent two solar cell modules, and can avoid the phenomenon of film strip curling, improving the series connection quality of the solar cell string.

[0017] 3. The present invention realizes fixing the first solder ribbon segment and the second solder ribbon segment of the solar cell string on the corresponding solar cells through the first encapsulant film and the second encapsulant film before the lamination process, forming a protective layer for the solder ribbon. Whether flipping and transporting the solar cell module or moving the solar cell string, the situation of the solder ribbon detaching from the solar cell will not occur. Description of the Drawings

[0018] Figure 1 It is a flowchart of a method for preparing a battery string provided by the present invention.

[0019] Figure 2 It is Figure 1 a flowchart of step S1 in

[0020] Figure 3 It is Figure 1 a flowchart of step S3 in

[0021] Figure 4 It is a schematic structural diagram of a battery string preparation device provided by the present invention. Specific Embodiments

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments.

[0023] Embodiment 1 As Figure 1 shown, a method for preparing a battery string includes the following steps S1 to S4.

[0024] S1: Prepare a battery cell assembly; the battery cell assembly includes battery cells, a solder ribbon group, and a first encapsulant film. Each solder ribbon in the solder ribbon group includes a first solder ribbon segment located on the battery cell and a second solder ribbon segment extending out of the battery cell. The first solder ribbon segment is fixed on the battery cell through the first encapsulant film.

[0025] As Figure 2 shown, in some embodiments of the present invention, preparing the battery cell assembly includes the following steps S11 to S14.

[0026] S11: The composite platform 11 moves to the first station, and the battery cell is placed on the composite platform 11. S12: The composite platform 11 moves to the second station, and the solder ribbon group is placed on the battery cell. S13: The composite platform 11 moves to the third station, and the first encapsulant film is attached to each first solder ribbon segment located on the battery cell, so that the first solder ribbon segment is fixed on the battery cell through the first encapsulant film, thereby obtaining the battery cell assembly. S14: The composite platform 11 moves to the fourth station, and the battery cell assembly is removed from the composite platform 11.

[0027] Among them, the composite platform 11 preferably adopts a rotary composite platform and is provided with vacuum adsorption holes for adsorbing and fixing the battery cell, so that the battery cell moves synchronously with the composite platform 11. A first heating component for heating the battery cell is also provided on the composite platform 11. During the movement of the composite platform 11, the first heating component always keeps heating the battery cell, so that the attached first encapsulant film melts and has adhesiveness, thereby bonding and fixing the first solder ribbon segment on the battery cell.

[0028] In some embodiments, buffer stations may be provided between the first station and the second station, between the second station and the third station, between the third station and the fourth station, and between the fourth station and the first station.

[0029] In some embodiments, the first adhesive film may be a plurality of adhesive strips arranged at intervals in the width direction, or may be a whole adhesive film.

[0030] S2: Flip and transport the battery cell assembly to the series transportation platform 2, and place the second solder tape section of the battery cell assembly on the battery cell of the previous battery cell assembly.

[0031] In some embodiments, the battery cell assembly at the fourth station of the composite platform 11 is fixed by means of vacuum adsorption fixation, flipped by 180°, and then the flipped battery cell assembly is transported to the series transportation platform 2. Of course, the battery cell assembly can also be directly flipped to the series transportation platform 2 after being adsorbed and fixed.

[0032] S3: Attach a second adhesive film to the previous battery cell assembly to fix the second solder tape section placed on the battery cell.

[0033] In some embodiments, as Figure 3 shown, this step S3 includes the following steps S31 to S34.

[0034] S31: Use the solder tape clamp 8 to position and press each of the second solder tape sections placed on the battery cell of the previous battery cell assembly.

[0035] In some embodiments, before transporting the battery cell assembly to the series transportation platform 2, the solder tape clamp 8 is first placed on the series transportation platform 2, and each clamping head of the solder tape clamp 8 is located above the battery cell where the second solder tape section is to be placed and kept in an open state; wherein, there is a gap between the clamping head of the solder tape clamp 8 and the upper surface of the battery cell to avoid the solder tape clamp 8 directly contacting the battery cell and reducing the risk of damaging the battery cell during the pressing process of the solder tape clamp 8. After transporting the battery cell assembly to the series transportation platform 2, each clamping head of the solder tape clamp 8 clamps and fixes the free end of the corresponding second solder tape section.

[0036] In this embodiment, by positioning and clamping the second solder tape section with the solder tape clamp 8, the position deflection of the second solder tape section when placed on the battery cell can be avoided, thereby affecting the attachment effect of the second adhesive film.

[0037] In some embodiments, two or more solder tape holders 8 can be placed on the string transportation platform 2. For example, before transporting the solar cell module onto the string transportation platform 2, the first solder tape holder 8 is placed on the string transportation platform 2 to positionally hold the free end of the second solder tape segment; after transporting the solar cell module onto the string transportation platform 2, the second solder tape holder 8 is placed on the string transportation platform 2 to positionally hold one end of the second solder tape segment close to the first solder tape segment.

[0038] S32: Attach a second adhesive film to the portion of each second solder tape segment that is not held by the solder tape holder 8.

[0039] In some embodiments, the second adhesive film can be several adhesive strips spaced along the width direction, or it can be a whole piece of adhesive film.

[0040] In some embodiments, in this step S32, one second adhesive film can be attached, or two or more second adhesive films spaced along the length direction can be attached.

[0041] S33: Recover the solder tape holder 8.

[0042] In some embodiments, after the first attachment of the second adhesive film, the solder tape holder 8 continues to move synchronously with the string transportation platform 2 to the recovery station. Each clamping head of the solder tape holder 8 releases the clamping of the solder tape, and the solder tape holder 8 is removed from the string transportation platform 2 for recovery. The recovered solder tape holder 8 can be transported to the initial position through the solder tape holder conveyor line 9.

[0043] S34: Attach a second adhesive film to the portion of each second solder tape segment that is held by the solder tape holder 8.

[0044] In some embodiments, this second adhesive film is the same as the second adhesive film attached in step S32, and can be several adhesive strips spaced along the width direction, or it can be a whole piece of adhesive film.

[0045] In some embodiments, this step S3 further includes pre-preparing at least two segments of the second adhesive film arranged along the length direction, and the sum of the lengths of each segment of the second adhesive film is equal to or slightly less than the length of the solar cell.

[0046] S4: Repeat the above steps S1 - S3 to obtain a battery string in which several solar cell modules are connected in parallel.

[0047] In some embodiments, after the two attachments of the second adhesive film, the second adhesive film on the solar cell module is roll-pressed so that the second adhesive film is tightly bonded to the solar cell.

[0048] In some embodiments, after the second adhesive film is roll-pressed, the solar cells located on the in-line transportation platform 2 are cooled. By cooling the solar cells, the second adhesive film can adhere more firmly to the solar cells, thereby reducing the risk of the second adhesive film becoming loose during subsequent transportation.

[0049] In some embodiments, the cooled battery string is cut to obtain a battery string of the required length.

[0050] The battery string preparation method of the present invention first prepares a solar cell assembly, then flips the solar cell assembly onto the in-line transportation platform 2, and makes the second solder tape segment of the solar cell assembly rest on the solar cell of the previous solar cell assembly. Then, a second adhesive film is attached to fix the second solder tape segment resting on the solar cell, thereby realizing the connection of several solar cell assemblies into a string. The entire stringing process is simple and efficient. In addition, the present invention realizes fixing the first solder tape segment and the second solder tape segment of the battery string on the corresponding solar cells through the first adhesive film and the second adhesive film before the lamination process, forming a protective layer for the solder tape. Whether the solar cell assembly is flipped and transported or the battery string is moved, the solder tape will not break away from the solar cell.

[0051] The battery string preparation method of the present invention first uses a solder tape pressing tool 8 to position and press each second solder tape segment resting on the solar cell of the previous solar cell assembly, and then attaches a second adhesive film to the part of each second solder tape segment that is not pressed by the solder tape pressing tool 8. After the solder tape pressing tool 8 is recycled, a second adhesive film is attached to the part of each second solder tape segment that is pressed by the solder tape pressing tool 8, thereby realizing the precise connection between adjacent two solar cell assemblies and avoiding the phenomenon of film strip curling, improving the quality of the battery string.

[0052] Embodiment 2 As shown in FIG. 4, the present embodiment provides a battery string preparation device for implementing the battery string preparation method of the above Embodiment 1. The battery string preparation device includes a solar cell assembly preparation device 1, an in-line transportation platform 2, a flipping and handling mechanism 3, and a second adhesive film attaching mechanism 4. Among them, the solar cell assembly preparation device 1 is used to prepare a solar cell assembly; the solar cell assembly includes a solar cell, a solder tape group, and a first adhesive film. Each solder tape in the solder tape group includes a first solder tape segment located on the solar cell and a second solder tape segment extending out of the solar cell, and the first solder tape segment is fixed on the solar cell through the first adhesive film. The flipping and handling mechanism 3 is used to flip the solar cell assembly prepared by the solar cell assembly preparation device 1 by 180° and transport it onto the in-line transportation platform 2, and make the second solder tape segment of the solar cell assembly rest on the solar cell of the previous solar cell assembly. The second adhesive film attaching mechanism 4 is used to attach a second adhesive film to the previous solar cell assembly to fix the resting second solder tape segment on the solar cell.

[0053] In some embodiments, the device 1 for preparing a solar cell assembly includes a movable composite platform 11, on which vacuum adsorption holes for adsorbing and fixing solar cells are provided. The composite platform 11 has a first station, a second station, a third station and a fourth station. Among them, a solar cell handling mechanism 5 is arranged at the first station, a solder tape handling mechanism 6 is arranged at the second station, a first adhesive film attaching mechanism 7 is arranged at the third station, and a flipping and handling mechanism 3 is arranged at the fourth station. When the composite platform 11 moves to the first station, the solar cell handling mechanism 5 places the solar cell on the composite platform 11; when the composite platform 11 moves to the second station, the solder tape handling mechanism 6 places a solder tape group on the solar cell; when the composite platform 11 moves to the third station, the first adhesive film attaching mechanism 7 attaches a first adhesive film to each first solder tape segment located on the solar cell, so that the first solder tape segment is fixed to the solar cell through the first adhesive film, thereby obtaining a solar cell assembly; when the composite platform 11 moves to the fourth station, the flipping and handling mechanism 3 flips the solar cell assembly on the composite platform 11 by 180° and then transports it to the series transportation platform 2.

[0054] Among them, a first heating assembly for heating the solar cell is further arranged on the composite platform 11. During the movement of the composite platform 11, the first heating assembly always keeps heating the solar cell, so that the attached first adhesive film melts and has viscosity, thereby bonding and fixing the first solder tape segment to the solar cell. In this embodiment, the composite platform 11 preferably adopts a rotary composite platform.

[0055] In some embodiments, the solar cell handling mechanism 5 preferably adsorbs and fixes the solar cell by means of vacuum adsorption, the solder tape handling mechanism 6 preferably fixes the solder tape group by means of clamping with jaws, the first adhesive film attaching mechanism 7 preferably adsorbs and fixes the first adhesive film by means of vacuum adsorption, and the flipping and handling mechanism 3 has a first grasping platform 31 and a second grasping platform 32. The first grasping platform 31 adsorbs and fixes the solar cell assembly on the composite platform 11 by means of vacuum adsorption, and then performs a 180° flip. The second grasping platform 32 adsorbs and fixes the solar cell assembly on the first grasping platform 31 by means of vacuum adsorption, and then transports and places it on the series transportation platform 2.

[0056] In some embodiments, buffer stations can be arranged between the first station and the second station, between the second station and the third station, between the third station and the fourth station, and between the fourth station and the first station of the composite platform 11.

[0057] In some embodiments, vacuum adsorption holes for adsorbing and fixing the solar cell assembly are provided on the series transportation platform 2, so that each solar cell assembly moves synchronously with the series transportation platform 2.

[0058] In some embodiments, a second heating component for heating the battery cells is provided inside the series conveying platform 2, so that the attached second adhesive film melts and becomes sticky, thereby bonding and fixing the second solder tape segments on the battery cells.

[0059] In some embodiments, the battery string manufacturing equipment of the present invention further includes a solder tape press 8 and a solder tape press handling mechanism 9. Among them, the solder tape press 8 is used to position and press each second solder tape segment placed on the battery cell of the previous battery cell assembly; the solder tape press handling mechanism 9 is used to transport the solder tape press 8 onto the series transportation platform 2 and recycle the solder tape press 8.

[0060] Furthermore, the solder tape press 8 has a plurality of clamping heads for clamping the solder tape, and there is a gap between each clamping head and the upper surface of the battery cell to prevent the solder tape press 8 from directly contacting the battery cell, thereby reducing the risk of damaging the battery cell during the pressing process of the solder tape press 8.

[0061] In some embodiments, there are two second adhesive film attaching mechanisms 4. The first second adhesive film attaching mechanism 4 is used to attach the second adhesive film to the part of each second solder tape segment that is not pressed by the solder tape press 8, and the second second adhesive film attaching mechanism 4 is used to attach the second adhesive film to the part of each second solder tape segment that is pressed by the solder tape press 8.

[0062] In some preferred embodiments, there are two solder tape presses 8. The first solder tape press 8 is used to press and fix the free end of the second solder tape segment, and the second solder tape press 8 is used to press and fix one end of the second solder tape segment close to the first solder tape segment; the first second adhesive film attaching mechanism 4 first attaches the second adhesive film to the second solder tape segment between the two solder tape presses 8. After the two solder tape presses 8 are withdrawn, the second second adhesive film attaching mechanism 4 attaches the second adhesive film to both ends of the second solder tape segment respectively. In this way, three second adhesive films are attached to each second solder tape segment.

[0063] In some embodiments, a rolling mechanism 21 and a cooling mechanism 22 are further provided on the series transportation platform 2. The rolling mechanism 21 is used to roll the battery cell assembly with the second adhesive film attached, so that the second adhesive film is tightly bonded to the battery cell. The cooling mechanism 22 is used to cool the rolled battery cell assembly, so that the second adhesive film adheres more firmly to the battery cell.

[0064] In some embodiments, a battery string cutting mechanism 10 is provided at the discharging end of the series transportation platform 2, which is used to cut the cooled battery string to obtain a battery string of the required length.

[0065] The battery string preparation equipment of the present invention adopts a battery cell assembly preparation device 1 to prepare a battery cell assembly, adopts a flipping and conveying mechanism 3 to flip the battery cell assembly prepared by the battery cell assembly preparation device 1 by 180 degrees and then convey it to a string transportation platform 2, and makes the second welding tape segment of the battery cell assembly overlap on the battery cell of the previous battery cell assembly, adopts a second adhesive film attaching mechanism 4 to attach a second adhesive film to the previous battery cell assembly to fix the overlapped second welding tape segment on the battery cell, thereby obtaining a battery string of multiple battery cell assemblies connected in series. The battery string preparation equipment has high preparation efficiency, high serial connection accuracy of each battery cell assembly, effectively avoids the film strip curling phenomenon, and improves the battery string quality.

[0066] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A method for preparing a battery string, characterized in that: The following steps are involved: Prepare a battery cell assembly; the battery cell assembly includes a battery cell, a welding ribbon group and a first adhesive film, each welding ribbon in the welding ribbon group includes a first welding ribbon segment located on the battery cell and a second welding ribbon segment extending from the battery cell, and the first welding ribbon segment is fixed on the battery cell by the first adhesive film; Turning over the cell assembly and transporting it to the string transport platform, and placing the second welding ribbon section of the cell assembly on the cell of the previous cell assembly; A second adhesive film is attached to the previous battery cell assembly to fix the second welding ribbon segment overlapped on the battery cell; Repeat the above steps to obtain a battery string with several battery cell assemblies connected in parallel.

2. A method for preparing a battery string according to claim 1, characterized in that: A second adhesive film is attached to the previous battery cell assembly to fix the second welding ribbon segment overlapped on the battery cell, including: Using a welding ribbon presser to position and hold each second welding ribbon segment overlapped on the battery cell of the previous battery cell assembly; affixing a second adhesive film to a portion of each second welding ribbon segment that is not held by the welding ribbon press; Recycling of solder ribbon press; A second adhesive film is attached to the portion of each second welding ribbon segment that is pressed by the welding ribbon press.

3. A method for preparing a battery string according to claim 2, characterized in that: A second adhesive film is attached to the previous battery cell assembly to fix the second welding strip segment overlapped on the battery cell, and at least two segments of the second adhesive film are pre-prepared along the length direction, and the sum of the lengths of each segment of the second adhesive film is equal to or slightly less than the length of the battery cell.

4. A method for preparing a battery string according to claim 2, characterized in that: Before the battery cell assembly is flipped over and transported to the string transport platform, the solder ribbon press is placed on the string transport platform, and each clamping head of the solder ribbon press is located above the battery cell and remains in an open state; after the battery cell assembly is flipped over and transported to the string transport platform, each clamping head of the solder ribbon press clamps and fixes the corresponding second solder ribbon segment.

5. A method for preparing a battery string according to claim 1, characterized in that: Before attaching the second adhesive film, the battery cells on the string transport platform are heated; after attaching the second adhesive film, the battery cells on the string transport platform are cooled.

6. A method for preparing a battery string according to claim 5, characterized in that: Before cooling the battery cells on the string transport platform, the attached second adhesive film is rolled to make the second adhesive film tightly bonded to the battery cells.

7. A method for preparing a battery string according to claim 1, characterized in that: The preparation of the battery cell assembly comprises: The composite platform moves to the first station and the battery cell is placed on the composite platform; The composite platform moves to the second station and places the welding ribbon group on the battery cell; The composite platform moves to the third station, and a first adhesive film is attached to each first welding ribbon segment on the battery cell, so that the first welding ribbon segment is fixed on the battery cell through the first adhesive film, thereby obtaining a battery cell assembly; The composite platform moves to the fourth station, and the battery cell assembly is moved away from the composite platform.

8. A method for preparing a battery string according to claim 7, characterized in that: The battery cell is heated during the movement of the composite platform.

9. A battery string preparation device, characterized in that: It includes a string transport platform, a battery cell assembly preparation device, a flipping mechanism and a second film transport mechanism; The battery cell assembly preparation device is capable of preparing a battery cell assembly; the battery cell assembly comprises a battery cell, a welding ribbon group and a first adhesive film, each welding ribbon in the welding ribbon group comprises a first welding ribbon segment located on the battery cell and a second welding ribbon segment extending out of the battery cell, and the first welding ribbon segment is fixed on the battery cell by the first adhesive film; The flipping and transporting mechanism can flip and transport the cell assembly prepared by the cell assembly preparation device to the string transport platform, and make the second welding ribbon section of the cell assembly overlap the cell of the previous cell assembly; The second adhesive film attaching mechanism can attach the second adhesive film to the previous battery cell assembly to fix the second welding ribbon segment overlapped on the battery cell.

10. A battery string preparation device according to claim 9, characterized in that: It also includes a solder ribbon press and a solder ribbon press conveying mechanism, wherein the solder ribbon press can position and press each second solder ribbon segment placed on the battery cell of the previous battery cell assembly; the solder ribbon press conveying mechanism can convey the solder ribbon press to the string transport platform, and recycle the solder ribbon press; There are two second adhesive film conveying mechanisms, the first of which can attach the second adhesive film to the portion of each second welding tape segment that is not held by the welding tape presser, and the second of which can attach the second adhesive film to the portion of each second welding tape segment that is held by the welding tape presser.

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