A method for manufacturing a battery string with a BC film

Abstract

The application relates to the technical field of solar cell string production, in particular to a BC film-coated cell string production method, which comprises the following steps: S1, providing an adhesive film to a second position; S2, laying a group of welding strips on the adhesive film located at the second position, wherein the front half of the welding strips is located at the second position, and the rear half of the welding strips is located at a first position; S3, stacking a battery piece and a pressing tool on the adhesive film located at the second position, so that the adhesive film located at the second position, the front half of the welding strips, the battery piece and the pressing tool are sequentially stacked from bottom to top to form a battery unit; S4, simultaneously moving all the battery units by a preset distance to move the battery unit located at the second position to a third position, and the rear half of the welding strips is moved from the first position to the second position; and S5, repeating steps S1-S4 to continuously form the battery unit, and heating the adhesive film located at the third position to make the adhesive film adhere to the corresponding welding strips and battery piece.

Description

Technical Field

[0001] This invention relates to the field of solar cell string production technology, specifically to a method for manufacturing BC coated solar cell strings. Background Technology

[0002] BC coated battery strings are battery strings that use hot melt adhesive film to bond and fix the back contact cells to the solder ribbon. In BC coated battery strings, the solder ribbon is located between the back contact cells and the adhesive film. The positive and negative electrodes of the back contact cells are distributed on the back side. Multiple sets of solder ribbons are connected to the back side of multiple back contact cells and connected in series.

[0003] In existing technologies, the production process of BC-coated battery strings involves: preparing multiple sets of solder ribbons and multiple adhesive films; pre-bonding the solder ribbons and adhesive films together; combining the pre-bonded solder ribbons and adhesive films with multiple arranged battery cells; and heating to form a battery string. This BC-coated battery string manufacturing process requires the prior preparation of multiple neatly arranged solder ribbons, multiple adhesive films, and multiple battery cells, resulting in a long preparation time and low production efficiency (only one BC-coated battery string can be produced at a time). Summary of the Invention

[0004] In view of this, the present invention provides a method for manufacturing BC coated battery strings, wherein an adhesive film, a solder strip and battery cells are continuously laid according to the BC coated battery string structure and then heated and cured to form a battery string, thereby solving the problem of low production efficiency of BC coated battery strings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A method for stringing BC coated batteries includes the following steps:

[0007] S1, providing adhesive film to the second position;

[0008] S2, a set of welding ribbons is laid on the adhesive film located at the second position, the front half of the welding ribbons is located at the second position, and the rear half of the welding ribbons is located at the first position;

[0009] S3, stack the battery cell and the press on the adhesive film located at the second position, so that the adhesive film located at the second position, the first half of the solder ribbon, the battery cell and the press are stacked from bottom to top to form a battery cell;

[0010] S4, all the battery cells are moved simultaneously at a preset distance, so that the battery cell located at the second position is moved to the third position, and the latter half of the welding strip is moved from the first position to the second position;

[0011] S5, repeat steps S1-S4 to continue forming the battery cell, and heat the adhesive film located at the third position to bond it to the corresponding solder ribbon and the battery cell;

[0012] The first position, the second position, and the third position are arranged in sequence, with adjacent sets of solder strips interlaced. The distance between two adjacent cells is the cell spacing or the string spacing. If the distance is the string spacing, the solder strip between the corresponding two adjacent cells is cut off.

[0013] Optionally, the distance between the first and second battery cells is the string spacing.

[0014] Optionally, the distance between the first and second battery cells is the inter-cell spacing. After step S1, a first set of solder ribbons is laid on the first adhesive film, such that the latter half of the first set of solder ribbons is located at the second position and the first half of the first set of solder ribbons is located at the third position, and then steps S2-S5 are executed.

[0015] Optionally, when performing step S3, the battery cell and the press are first stacked together, and then the stacked battery cell and the press are placed on the adhesive film.

[0016] Optionally, when performing step S3, the battery cell is bent so that the front half of the battery cell is raised and the rear half of the battery cell remains flat. After the rear half of the battery cell abuts against the solder ribbon on the adhesive film, the first end of the solder ribbon is released first, and then the battery cell is restored to flatness.

[0017] Optionally, all the battery cells are transported using a conveyor belt, which includes a connected vertical conveyor section and a horizontal conveyor section. The vertical conveyor section is covered with the adhesive film, which is conveyed from the vertical conveyor section to the horizontal conveyor section from bottom to top. The second position is located at the end of the horizontal conveyor section near the vertical conveyor section, and the third position is located on the horizontal conveyor section to one side of the second position. The first position is located on one side of the connection between the vertical conveyor section and the horizontal conveyor section.

[0018] Optionally, the first position is provided with a support plate, which is used to support and control the tail end of the welding strip during step S2.

[0019] Optionally, there is an arc-shaped transition section between the vertical conveying section and the horizontal conveying section. The front half of the adhesive film provided to the second position is attached to the horizontal conveying section, and the rear half is attached to the arc-shaped transition section. The tail end of the battery cell stacked on the adhesive film is suspended above the arc-shaped transition section. A support member and a limiting member are provided below the suspended tail end of the battery cell. The support member is used to support the suspended tail end of the battery cell, and the limiting member is used to prevent the solder strip from radially shifting during movement. During the process of the battery cell being transferred from the second position to the third position, the adhesive film returns to flatness.

[0020] Optionally, the third position is provided with a heating zone for heating the adhesive film. Optionally, before performing step S2, adhesive tape is applied to the back of the tail end or both ends of the battery cell, with a portion of the tape adhering to the battery cell and another portion extending out of the battery cell. When performing S3, when stacking the (N+1)th battery cell on the adhesive film located at the second position, the head end of the (N+1)th battery cell is stacked on the adhesive tape adhering to the tail end of the Nth battery cell and extending out of the Nth battery cell, where N is a positive integer.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] The present invention provides a method for manufacturing BC-coated battery strings. First, an adhesive film is provided to a second position. Then, a set of solder ribbons is laid at the second position, with the first half of the ribbons located at the second position and the second half at a first position. Next, battery cells and a pressing fixture are stacked on the adhesive film, with the adhesive film, the first half of the solder ribbons, the battery cells, and the pressing fixture stacked sequentially from bottom to top to form a battery cell. The battery cell is then transferred to a third position. Finally, the above steps are repeated to continuously form battery cells, and the cells are heated to produce BC-coated battery strings. Using this method, BC-coated battery strings can be continuously produced, improving string manufacturing efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the first type of BC coated battery string in this invention;

[0025] Figure 2 This is a schematic diagram of the structure of the second type of BC coated battery string in this invention;

[0026] Figure 3 This is a schematic diagram of one laying method of BC coated battery strings in this invention;

[0027] Figure 4 This is a schematic diagram of another laying method for BC coated battery strings in this invention;

[0028] Figure 5 This is a schematic diagram of one method of laying the solder strip and the battery cell during the BC coated battery string laying process in this invention;

[0029] Figure 6 This is a schematic diagram of one method of laying the adhesive film and welding strip during the BC coated battery string laying process in this invention.

[0030] Among them: 10, BC coated battery string; 11, welding strip; 12, battery cell; 13, adhesive film; 14, adhesive tape; 20, press; 30, conveyor belt; 31, vertical conveyor section; 32, horizontal conveyor section; 40, clamp; 50, handling assembly; 51, mounting frame; 52, suction component; 53, first suction cup group; 54, second suction cup group; 55, pressure strip; 60, support component; 70, limiting component; 80, pallet; 90, heating component; S, cell spacing; S', string spacing. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In this invention, the structure of the first type of BC-coated battery string 10 is as follows: Figure 1 The diagram shows the back side of a first type of BC-coated battery string 10, including solder ribbons 11, battery cells 12, and adhesive film 13. The back sides of adjacent battery cells 12 are connected using the same set of solder ribbons 11. The adhesive film 13 is adhered to the back side of the battery cells 12, with the solder ribbons 11 positioned between the battery cells 12 and the adhesive film 13. The adhesive film 13 can be an EVA film, PO film, PVE film, or other heat-adhesive films.

[0033] like Figure 3 As shown, for the above-mentioned BC-coated battery string 10, the present invention provides a method for manufacturing the BC-coated battery string 10, including the following steps:

[0034] S1, providing adhesive film 13 to the second position;

[0035] S2, a set of welding ribbons 11 are laid on the adhesive film 13 located in the second position, with the front half of the welding ribbons 11 located in the second position and the rear half of the welding ribbons 11 located in the first position.

[0036] S3, stack the battery cell 12 and the press 20 on the adhesive film 13 located in the second position, so that the adhesive film 13 located in the second position, the first half of the welding ribbon 11, the battery cell 12 and the press 20 are stacked from bottom to top to form a battery cell.

[0037] S4, all battery cells are moved simultaneously at a preset distance, so that the battery cell located in the second position is moved to the third position, and the latter half of the welding strip 11 is moved from the first position to the second position.

[0038] S5, repeat steps S1-S4 to continue forming battery cells, and heat the adhesive film 13 located at the third position to bond it to the corresponding solder ribbon 11 and battery cell 12.

[0039] The first, second, and third positions are arranged in sequence, with two adjacent sets of welding strips 11 interlacing each other. The distance between two adjacent cells 12 is the cell spacing S or the string spacing S'. If the distance is the string spacing S', the welding strip 11 between the corresponding two adjacent cells 12 is cut off.

[0040] In the method of this invention, the press 20 is used to maintain stability among the adhesive film 13, the solder ribbon 11, and the battery cell 12, preventing relative displacement between the solder ribbon 11 and the battery cell 12 during the movement of the battery cell. The press 20 is also used to provide pressure so that when the adhesive film 13 is heated and softened, the solder ribbon 11 can embed into the adhesive film 13, allowing the battery cell 12 to directly contact and adhere to the adhesive film 13. If the distance between the battery cell 12 at the second position and the next battery cell 12 is the cell spacing S, then the preset distance is equal to the sum of the width of the battery cell 12 and the cell spacing S; if the distance between the battery cell 12 at the second position and the next battery cell 12 is the string spacing S', then the preset distance is equal to the sum of the width of the battery cell 12 and the string spacing S'. The BC-coated battery string 10 has multiple battery cells 12. After heating and cooling to solidify the adhesive film 13 corresponding to the multiple battery cells 12, a BC-coated battery string 10 of the corresponding length can be formed.

[0041] Using the method of this invention, multiple BC-coated battery strings 10 can be continuously produced. The distance between two adjacent battery cells 12 in two adjacent BC-coated battery strings 10 is the string spacing S', and the distance between two adjacent battery cells 12 in each BC-coated battery string 10 is the cell spacing S. The string spacing S' is greater than the cell spacing S. When providing a film 13 belonging to the same BC-coated battery string 10 to the second position, the distance between two adjacent films 13 is the same, and the preset distance is the sum of the width of the battery cell 12 and the cell spacing S. After the last film 13 belonging to the same BC coated battery string 10 is provided to the second position, a set of longer solder ribbons 11 are laid on the film 13. The length of the set of solder ribbons 11 meets the string spacing S' requirement and is longer than the length of the solder ribbons 11 connecting two adjacent battery cells 12 in the same BC coated battery string 10. After the last battery cell belonging to the same BC coated battery string 10 is formed, all battery cells are moved forward by a distance equal to the sum of the width of the battery cell 12 and the string spacing S'. Then, the first film 13 belonging to the next BC coated battery string 10 is provided to the second position, and steps S2-S5 are executed. Finally, the solder ribbons 11 between two adjacent BC coated battery strings 10 are cut off.

[0042] The BC-coated battery string 10 has solder strips 11 at both ends extending into battery cells 12 for welding to the busbar. In the first method provided by this invention, when producing the first BC-coated battery string 10, the distance between the first battery cell 12 and the second battery cell 12 is the string spacing S'. That is, after forming the first battery cell, the distance the first battery cell is moved forward is the sum of the width of the battery cell 12 and the string spacing S'. The length of the set of solder strips 11 laid on the first adhesive film 13 meets the string spacing S' requirement. After forming a battery string of a certain length, the solder strips 11 between the first battery cell 12 and the second battery cell 12 are cut off. The second battery cell 12 serves as the battery cell 12 at the beginning of the first BC-coated battery string 10 to form the beginning of the first BC-coated battery string 10.

[0043] like Figure 4 As shown, in the second method provided by this invention, the distance between the first battery cell 12 and the second battery cell 12 is the inter-cell spacing S. After executing step S1, a first set of solder ribbons 11 is first laid on the first adhesive film 13, with the latter half of the first set of solder ribbons 11 located in the second position and the former half of the first set of solder ribbons 11 located in the third position. Then, steps S2-S5 are executed to form the first end of the first BC-coated battery string 10. It should be noted that the length of the first set of solder ribbons 11 is less than the length of the second set of solder ribbons 11; or, the length of the first set of solder ribbons 11 is equal to the length of the second set of solder ribbons 11. After forming a battery string of a certain length, the excess portion of the first set of solder ribbons 11 is cut off.

[0044] In an optional embodiment of the present invention, when performing step S3, the battery cell 12 and the press 20 are first stacked together, and then the stacked battery cell 12 and the press 20 are placed on the adhesive film 13. Stacking the battery cell 12 and the press 20 together before placing them on the adhesive film 13 during steps S1 or S2 can improve stringing efficiency.

[0045] like Figure 5As shown, in an optional embodiment of the present invention, during step S3, the battery cell 12 is bent so that the front half of the battery cell 12 is raised while the rear half remains flat. After the rear half of the battery cell 12 abuts against the solder ribbon 11 on the adhesive film 13, the first end of the solder ribbon 11 is released first, and then the battery cell 12 is restored to its flat state. The first end of the solder ribbon 11 is the end of the front half of the solder ribbon 11, and the last end of the solder ribbon 11 is the end of the rear half of the solder ribbon 11. The front half of the battery cell 12 is the part of the battery cell 12 near the first end of the solder ribbon 11, and the rear half of the battery cell 12 is the part of the battery cell 12 near the last end of the solder ribbon 11. The first end of the solder ribbon 11 is clamped, pulled, and released by the clamp 40 and then laid on the adhesive film 13. When the front half of the solder ribbon 11 is pulled above the adhesive film 13, the solder ribbon 11 is released directly. After the solder ribbon 11 falls onto the adhesive film 13, it is easy to deviate from the preset position. The rear half of the battery cell 12 first abuts against the solder ribbon 11 on the adhesive film 13. This first fixes the rear half of the front half of the solder ribbon 11 to the battery cell 12. After releasing the solder ribbon 11, the first end of the solder ribbon 11 will not deviate significantly from the preset position, thus improving the laying accuracy of the solder ribbon 11. It should be noted that the battery cell 12 can undergo elastic deformation within a certain range. The battery cell 12 used in this invention is a gridless battery cell, which is thinner and easier to bend. In this invention, the transport assembly 50 can be used to transport the battery cell 12 and the pressure fixture 20 simultaneously. The transport assembly 50 includes a mounting frame 51 and an adsorption member 52, a first suction cup group 53, a second suction cup group 54, and a pressure strip 55 disposed at the bottom of the mounting frame 51. The adsorption member 52, the second suction cup group 54, and the pressure strip 55 can move up and down relative to the first suction cup group 53, and the second suction cup group 54 can also rotate. The presser 20 is provided with clearance holes so that the first suction cup group 53, the second suction cup group 54 and the pressure strip 55 can pass through the presser 20. The adsorption member 52 is a suction cup or a magnet, used to adsorb the presser 20; the first suction cup group 53 and the second suction cup group 54 include multiple suction cups, which are used to adsorb the rear half and the front half of the battery cell 12, respectively, and the pressure strip is disposed between the first suction cup group 53 and the second suction cup group 54. During operation, the adsorption element 52 moves down to the low position adsorption pressure 20 and then moves up to the high position. Then, the first suction cup group 53 and the second suction cup group 54 adsorb the battery cell 12 and place it below the pressure 20. Next, the pressure bar 55 moves down to the same height as the first suction cup group 53 and the second suction cup group 54. The second suction cup group 54 moves up to bend the battery cell 12. The mounting bracket 51 moves so that the rear half of the battery cell 12 abuts against the welding strip 11 on the adhesive film 13. After the clamp 40 releases the first end of the welding strip 11, the second suction cup group 54 moves down or directly releases the front half of the battery cell 12 to restore the battery cell 12 to a flat position. Finally, the adsorption element 52 moves down to place the pressure 20 on the battery cell 12.

[0046] like Figure 6As shown, in this invention, a conveyor belt 30 is used to transport all battery cells. The conveyor belt 30 includes a vertical conveying section 31 and a horizontal conveying section 32. A film 13 is laid on the vertical conveying section 31 and is conveyed from bottom to top from the vertical conveying section 31 to the horizontal conveying section 32. A second position is located at the end of the horizontal conveying section 32 near the vertical conveying section 31, a third position is located on the horizontal conveying section 32 to one side of the second position, and a first position is located on one side of the connection between the vertical and horizontal conveying sections 31 and 32. The film 13 is adsorbed onto the conveyor belt 30. At least two films 13 can be buffered on the vertical conveying section 31, and the spacing between two adjacent buffered films 13 meets the requirements of the sheet spacing S or the string spacing S'. In other embodiments of this invention, the conveyor belt 30 includes a connected inclined conveying section and a horizontal conveying section 32, with the inclined conveying section inclined relative to the horizontal conveying section 32.

[0047] In an optional embodiment of the present invention, a support plate 80 is provided at the first position. When performing step S2, the support plate 80 is used to lift and control the tail end of the welding strip 11. The support plate 80 can move simultaneously with the clamp 40 to cooperate with the clamp 40 in laying the welding strip 11, so that the welding strip 11 is always under control and the welding strip 11 is prevented from shaking during the laying process.

[0048] In an optional embodiment of the present invention, there is an arc-shaped transition section between the vertical conveying section 31 and the horizontal conveying section 32. The front half of the adhesive film 13 provided to the second position is attached to the horizontal conveying section 32, and the rear half is attached to the arc-shaped transition section. The tail end of the battery cell 12 stacked on the adhesive film 13 is suspended above the arc-shaped transition section. A support member 60 and a limiting member 70 are provided below the suspended tail end of the battery cell 12. The support member 60 is used to support the suspended tail end of the battery cell 12, and the limiting member 70 is used to prevent the solder ribbon 11 from shifting radially during the movement. During the process of the battery cell being transferred from the second position to the third position, the adhesive film 13 returns to flatness. The support member 60 is disposed between the horizontal conveying section 32 of the limiting member 70. The support member 60 is provided with a guide groove for accommodating the welding strip 11 to prevent the tail end of the battery cell 12 from pressing the welding strip 11. When the conveyor belt 30 moves the cell unit forward, the welding strip 11 moves forward simultaneously with the adhesive film 13. The limiting member 70 can improve the bonding accuracy between the rear half of the front half of the welding strip 11 and the adhesive film 13.

[0049] It should be noted that the first end of the battery cell 12 is the end of the front half of the battery cell 12, and the tail end of the battery cell 12 is the end of the rear half of the battery cell 12.

[0050] In an optional embodiment of the present invention, a heating zone is provided at the third position for heating the adhesive film 13. Specifically, a heating element 90 is provided in the heating zone, and the heating element 90 is located above the horizontal conveying section 32. The heating element 90 is an infrared heating device. The adhesive film 13 is continuously heated during the process of the battery cells entering and leaving the heating zone; or, the adhesive film 13 is heated after all the battery cells have entered the heating zone.

[0051] like Figure 2 The diagram shows the back side of a second type of BC-coated battery string 10, including solder ribbons 11, battery cells 12, adhesive film 13, and adhesive tape 14. The back sides of adjacent battery cells 12 are connected using the same set of solder ribbons 11. Adhesive film 13 is adhered to the back side of each battery cell 12, with the solder ribbons 11 positioned between the battery cell 12 and the adhesive film 13. Adhesive tape 14 is adhered to the back side of both ends of each battery cell 12. The adhesive tape 14 is used to cover the gaps between adjacent battery cells 12 and the gaps between the battery cell 12 and the busbar, improving the aesthetics of the battery assembly.

[0052] To produce the second type of BC-coated battery string 10, before performing step S2, adhesive tape 14 is applied to the back of the end or both ends of the battery cell 12. Part of the adhesive tape 14 is adhered to the battery cell 12, and the other part extends out of the battery cell 12. During step S3, when the (N+1)th battery cell 12 is stacked on the adhesive film 13 located at the second position, the beginning end of the (N+1)th battery cell 12 is stacked on the adhesive tape 14 that is adhered to the end of the Nth battery cell 12 and extends out of the Nth battery cell 12, where N is a positive integer. Specifically, if a battery cell is the first battery cell 12 in the BC-coated battery string 10, adhesive tape 14 is applied to the back of both ends of the battery cell 12, and adhesive tape 14 is applied to the back of the end of the other battery cells 12. The tape 14 is composed of at least two layers of film. One side of the tape that is adhered to the battery cell 12 can be an EVA film, PO film, PVE film or other thin film that has adhesive properties when heated, while the other side does not have adhesive properties when heated. The tape 14 is applied to the battery cell 12 by heating. The tape 14 is also heated when it enters the heating zone.

[0053] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for stringing BC coated batteries, characterized in that, Includes the following steps: S1, provide adhesive film (13) to the second position; S2, a set of welding ribbons (11) are laid on the adhesive film (13) located in the second position, the front half of the welding ribbons (11) is located in the second position, and the rear half of the welding ribbons (11) is located in the first position; S3, stack the battery sheet (12) and the press (20) on the adhesive film (13) located in the second position, and bend the battery sheet (12) so that the front part of the battery sheet (12) is raised and the rear part of the battery sheet (12) is kept flat, so that the adhesive film (13) located in the second position, the front half of the welding ribbon (11), the battery sheet (12) and the press (20) are stacked from bottom to top to form a battery cell; S4, all the battery cells are moved at a preset distance at the same time, so that the battery cell located in the second position is moved to the third position, and the rear half of the welding strip (11) is moved from the first position to the second position; S5, repeat steps S1-S4 to continue forming the battery cell, and heat the adhesive film (13) located at the third position to bond it to the corresponding solder ribbon (11) and the battery cell (12); The first position, the second position and the third position are arranged in sequence, and the two adjacent sets of solder strips (11) are staggered. The distance between two adjacent battery cells (12) is the cell spacing (S) or the string spacing (S'). If the distance is the string spacing (S'), the solder strips (11) between the corresponding two adjacent battery cells (12) are cut off.

2. The method for stringing BC coated batteries according to claim 1, characterized in that: The distance between the first battery cell (12) and the second battery cell (12) is the string spacing (S').

3. The method for stringing BC coated batteries according to claim 1, characterized in that: The distance between the first battery cell (12) and the second battery cell (12) is the cell spacing (S). After step S1, the first set of solder ribbons (11) is laid on the first adhesive film (13), so that the latter half of the first set of solder ribbons (11) is located in the second position and the first half of the first set of solder ribbons (11) is located in the third position. Then, steps S2-S5 are executed.

4. The method for stringing BC coated batteries according to claim 1, characterized in that: When performing step S3, the battery cell (12) and the press (20) are first stacked together, and then the stacked battery cell (12) and the press (20) are placed on the adhesive film (13).

5. The method for stringing BC coated batteries according to claim 1, characterized in that: All the battery cells are transferred using a conveyor belt (30), which includes a connected vertical conveyor section (31) and a horizontal conveyor section (32). The vertical conveyor section (31) is covered with the adhesive film (13), which is conveyed from the vertical conveyor section (31) to the horizontal conveyor section (32) from bottom to top. The second position is located on the horizontal conveyor section (32) near the end of the vertical conveyor section (31), and the third position is located on the horizontal conveyor section (32) to one side of the second position. The first position is located on one side of the connection between the vertical conveyor section (31) and the horizontal conveyor section (32).

6. The method for stringing BC coated batteries according to claim 5, characterized in that: The first position is provided with a support plate (80). When step S2 is performed, the support plate (80) is used to support and control the tail end of the welding strip (11).

7. The method for stringing BC coated batteries according to claim 5, characterized in that: There is an arc-shaped transition section between the vertical conveying section (31) and the horizontal conveying section (32). The front half of the adhesive film (13) provided to the second position is attached to the horizontal conveying section (32), and the rear half is attached to the arc-shaped transition section. The tail end of the battery cell (12) stacked on the adhesive film (13) is suspended above the arc-shaped transition section. A support member (60) and a limiting member (70) are provided below the suspended tail end of the battery cell (12). The support member (60) is used to support the suspended tail end of the battery cell (12), and the limiting member (70) is used to prevent the solder strip (11) from radially shifting during movement. During the process of the battery cell being transferred from the second position to the third position, the adhesive film (13) returns to flatness.

8. The method for stringing BC coated batteries according to claim 1, characterized in that: The third position is provided with a heating zone, which is used to heat the adhesive film (13).

9. The method for stringing BC coated batteries according to claim 1, characterized in that: Before performing step S2, adhesive tape (14) is attached to the back of the tail end or both ends of the battery cell (12). Part of the adhesive tape (14) is attached to the battery cell (12), and another part extends out of the battery cell (12). When performing step S3, when the N+1th battery cell (12) is stacked on the adhesive film (13) located in the second position, the head end of the N+1th battery cell (12) is stacked on the adhesive tape (14) attached to the tail end of the Nth battery cell (12) and extending out of the Nth battery cell (12). N is a positive integer.

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