Indirect series welding method for battery pieces

Abstract

The invention relates to the technical field of battery piece welding processes, in particular to a battery piece indirect type series welding method which comprises a welding table device, a welding device, a piece supply device, a wire supply device and a discharging device, the welding table device is provided with a material carrying plate and a temperature control assembly, the welding device is provided with a laser welding assembly and a wire pressing assembly, and the wire pressing assembly comprises a heat conduction piece. The welding method comprises the following steps: temperature adjustment: adjusting the working temperature of a material carrying plate by a temperature control assembly; plate placing: fixing an external battery piece on a material carrying plate by a piece supply device; adjusting the distance: adjusting the distance between two adjacent heat-conducting fins; carrying is conducted, specifically, the wire supply device transfers the external welding wire section to the position under the heat-conducting piece; positioning: pressing the welding wire section on the surface of the battery piece by the heat-conducting sheet to ensure the stability of the welding wire relative to the connecting part of the battery piece; welding: welding the welding wire section and the battery piece by a laser welding assembly; and discharging is conducted, specifically, a discharging device detects welded finished products and transfers the finished products to the next procedure, and the stability and controllability of the welding quality of the welding wires and the battery pieces are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell welding processes, and in particular to an indirect series welding method for battery cells. Background Art

[0002] Welding a welding wire on the surfaces of a plurality of battery cells by a welding device so that the plurality of battery cells are in series is an important step in the production process of battery cells. The existing welding process has the following problems: First, the parallelism after welding between two adjacent welding wires and the battery cells exceeds the preset range; Second, the welding firmness between the welding wire and the battery cell per unit length is unstable, that is, it affects the welding quality stability of the welding wire and the battery cell and the subsequent processing quality; Third, the external temperature during the welding process has a great influence on the welding quality; In view of the above existing problems, the welding process needs to be improved. Summary of the Invention

[0003] In order to overcome the problem of unstable welding quality between the welding wire and the battery cell in the prior art, the purpose of the present invention is to provide an indirect series welding method for battery cells, which improves the welding quality stability of the welding wire and the battery cell and the controllability of the processing quality.

[0004] To achieve the above object, the technical solution of the present invention is as follows.

[0005] An indirect series welding method for battery cells includes a soldering station device, a welding device, a wafer feeding device, a wire feeding device and a blanking device. The soldering station device is provided with a loading plate and a temperature control component. The welding device is provided with a laser welding component and a wire pressing component. The wire pressing component includes a plurality of heat conducting sheets. The welding steps are as follows:

[0006] Temperature adjustment step: Adjust the working temperature of the loading plate through the temperature control component, and the temperature setting range is: 0 - 200 °C;

[0007] Wafer placement step: The wafer feeding device fixes an external battery cell on the loading plate;

[0008] Distance adjustment step: Adjust the distance between two adjacent heat conducting sheets of the wire pressing component so that the distance between two adjacent heat conducting sheets is the same as the distance between two adjacent external welding wire segments;

[0009] Transportation step: The wire feeding device transports an external welding wire segment to the lower part of the wire pressing component, and one external welding wire segment is located directly below one of the heat conducting sheets;

[0010] Positioning step: Drive the welding device to move down so that a heat conducting sheet presses an external welding wire segment on the surface of the external battery cell, and the heat conducting sheet fits with the external battery cell;

[0011] Welding step: The laser welding component welds the external welding wire segment and the external battery cell;

[0012] Blanking step: The blanking device inspects the welded finished product and transfers it to the next process.

[0013] Furthermore, each of the heat-conducting sheets includes a wire clamping groove which is arranged along the length direction of the heat-conducting sheet. The width of the wire clamping groove is greater than the outer diameter of the external wire segment, and the depth of the wire clamping groove is less than the outer diameter of the external wire segment.

[0014] Furthermore, the wire pressing assembly further includes a jig body and a connecting member. The jig body is connected to the connecting member, and the heat-conducting sheet is arranged on the jig body. The length direction of the heat-conducting sheet intersects with the length direction of the jig body.

[0015] The jig body includes a plurality of mounting members. Adjacent two mounting members are arranged in parallel at intervals, and each mounting member is connected to the connecting member.

[0016] Furthermore, the sheet supply device includes a workbench, a sheet material correction assembly, a first linear guide rail, a glue pasting slide table, a first manipulator, a glue supply and pasting assembly, and a second manipulator. The sheet material correction assembly is arranged on the workbench. The first linear guide rail is arranged on the workbench. The glue pasting slide table is slidably connected to the first linear guide rail. The first manipulator is arranged on the workbench and transfers the external battery cell of the sheet material correction assembly to the glue pasting slide table. The glue supply and pasting assembly is arranged on the workbench and above the first linear guide rail. The second manipulator transfers the externally glued battery cell to the loading plate.

[0017] Furthermore, the wire supply device includes a second linear guide rail, a wire reel holder, a traction assembly, a wire cutting assembly, and a wire transferring assembly. The second linear guide rail is arranged in parallel with the first linear guide rail. The length direction of the wire cutting assembly is arranged in parallel with the length direction of the second linear guide rail. The wire reel holder is arranged near the end of the second linear guide rail. The traction assembly is slidably connected to the second linear guide rail. The wire transferring assembly transfers the cut wire segment to directly below the heat-conducting sheet.

[0018] Furthermore, the wire cutting assembly includes a third linear guide rail, a plurality of first sliding seats, a plurality of first wire clamping members, and a plurality of cutting knife members. The plurality of first sliding seats are arranged in sequence along the length direction of the third linear guide rail.

[0019] Two of the first wire clamping members and one of the cutting knife members are arranged on one first sliding seat, and the cutting knife member is arranged between the two first wire clamping members.

[0020] Furthermore, the cutting knife member includes a first lifting driving source, a cutting blade, a first horizontal driving source, and a wire pressing member. The first horizontal driving source drives the wire pressing member to move horizontally, and the first lifting driving source drives the cutting blade to move longitudinally so that the cutting blade is tangent to the wire pressing member.

[0021] Further, the wire cutting assembly further includes a plurality of second sliding seats and a plurality of second wire clamping members. The second sliding seats are slidably connected to the third linear guide rails. One second sliding seat is disposed between two adjacent first sliding seats, and one second wire clamping member is disposed on one second sliding seat.

[0022] Further, the wire transferring assembly includes a second lifting driving source, a main board, a plurality of supporting boards, and a plurality of clamping jaws. The second lifting driving source drives the main board to lift. The plurality of supporting boards are arranged along the length direction of the main board, and the plurality of clamping jaws are disposed on one of the supporting boards.

[0023] Further, the soldering station device further includes a fourth linear guide rail. The material loading plate is slidably connected to the linear guide rail, and the fourth linear guide rail is arranged in parallel with the second linear guide rail.

[0024] The beneficial effects of the present invention are as follows: By providing a temperature control component on the material loading plate, the surface temperature of the material loading plate is within a preset range during the welding process. By installing a heat conducting sheet on the wire pressing component, the heat conducting sheet presses the external welding wire on the surface of the external battery cell, ensuring the stability of the connection part of the external welding wire relative to the battery cell. At the same time, the heat of the material loading plate is transferred to the heat conducting sheet, controlling the temperature of the welding wire and the external battery cell within a preset range, and improving the stability and controllability of the welding quality of the welding wire and the battery cell. Description of the Drawings

[0025] Figure 1-1 It is an illustration of the process steps of the present invention;

[0026] Figure 1-2 It is a schematic diagram of the device structure of the present invention;

[0027] Figure 1-3 It is a three-dimensional structure schematic diagram of the soldering station device and the welding state of the present invention;

[0028] Figure 1-4 It is a schematic diagram of the structure of the material loading plate of the present invention;

[0029] Figure 1-5 It is a schematic diagram of the structure of the welding device of the present invention;

[0030] Figure 1-6 It is a schematic diagram of the structure of the wire pressing component from the first perspective of the present invention;

[0031] Figure 1-7 It is a schematic diagram of the structure of the wire pressing component from the second perspective of the present invention;

[0032] Figure 1-8 It is a schematic diagram of the structure of the wire pressing component from the third perspective of the present invention;

[0033] Figure 1-9 It is a schematic diagram of the structure of the heat conducting sheet of the present invention;

[0034] Figure 2-1 Schematic structural diagram of the film feeding device of the present invention;

[0035] Figure 3-1 Schematic structural diagram of the soldering station device, welding device, and wire feeding device of the present invention;

[0036] Figure 3-2 Schematic structural diagram of the first perspective of the wire feeding device and the soldering station device of the present invention;

[0037] Figure 3-3 Schematic structural diagram of the second perspective of the wire feeding device and the soldering station device of the present invention;

[0038] Figure 3-4 Schematic structural diagram of the traction assembly of the present invention;

[0039] Figure 3-5 Schematic structural diagram of the wire cutting assembly of the present invention;

[0040] Figure 3-6 Schematic structural diagram of the assembly of the first sliding seat, the first wire clamping member, and the cutting tool member of the present invention;

[0041] Figure 3-7 Schematic structural diagram of the first wire clamping member of the present invention;

[0042] Figure 3-8 Schematic structural diagram of the first perspective of the cutting tool member of the present invention;

[0043] Figure 3-9 Schematic structural diagram of the second perspective of the cutting tool member of the present invention;

[0044] Figure 3-10 Schematic structural diagram of the wire transferring assembly of the present invention.

[0045] Reference numerals include:

[0046] 1 - Soldering station device 11 - Loading plate 12 - Fourth linear guide rail

[0047] 2 - Welding device 21 - Laser welding assembly 22 - Wire pressing assembly

[0048] 221 - Heat conducting sheet 2211 - Convex part 221a - Wire clamping groove

[0049] 221x - Sheet body 222 - Fixture body 2221 - Card slot

[0050] 222a - Mounting member 223 - Connecting member 224 - Elastic member

[0051] 3 - Film feeding device 31 - Workbench 32 - Film stock alignment assembly

[0052] 33 - First linear guide rail 34 - Glue pasting slide table 35 - First manipulator

[0053] 36 - Glue supply and pasting assembly 37 - Second manipulator

[0054] 4 - Wire supply device 41 - Second linear guide rail 42 - Wire reel holder

[0055] 43 - Traction assembly 44 - Wire cutting assembly 441 - Third linear guide rail

[0056] 442 - First sliding seat 443 - First wire clamping part 444 - Cutting tool part

[0057] 4441 - First lifting drive source 4442 - Cutting piece 4443 - First horizontal drive source

[0058] 4444 - Wire pressing part 445 - Second sliding seat 446 - Second wire clamping part

[0059] 45 - Wire transferring assembly 451 - Second lifting drive source 452 - Main board

[0060] 453 - Support board 454 - Claw

[0061] 5 - Blank discharging device

[0062] 100 - Battery cell 200 - Welding wire segment. Specific embodiments

[0063] For the convenience of those skilled in the art, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the embodiments does not limit the present invention.

[0064] Please refer to Figures 1-1 to 1-9 , an indirect series welding method for battery cells of the present invention includes a soldering table device 1, a welding device 2, a wafer supply device 3, a wire supply device 4 and a blank discharging device 5. The soldering table device 1 is provided with a loading plate 11 and a temperature control component. The welding device 2 is provided with a laser welding component 21 and a wire pressing component 22. The wire pressing component 22 includes a plurality of heat conducting sheets 221. The welding steps are as follows:

[0065] Temperature adjustment step: Adjust the working temperature of the loading plate 11 through the temperature control component, and the temperature setting range is: 0 - 200 °C;

[0066] Plate placement step: The wafer supply device 3 fixes the external battery cells 100 on the loading plate 11;

[0067] Distance adjustment step: Adjust the distance between two adjacent heat conducting sheets 221 of the wire pressing component 22 so that the distance between two adjacent heat conducting sheets 221 is the same as the distance between two adjacent external welding wire segments 200;

[0068] Transportation step: The wire supply device 4 transports the external wire segment 200 to the lower part of the wire pressing assembly 22, and one external wire segment 200 is located directly below one of the heat conducting sheets 221.

[0069] Positioning step: Drive the welding device 2 to move downward so that one heat conducting sheet 221 presses one external wire segment 200 on the surface of the external battery cell 100, and the heat conducting sheet 221 is in contact with the external battery cell 100.

[0070] Welding step: The laser welding assembly 21 welds the external wire segment 200 to the external battery cell 100.

[0071] Unloading step: The unloading device 5 inspects the welded finished product and transports it to the next process.

[0072] Specifically, in this embodiment, the soldering table device 1 includes a loading plate 11 and a temperature control component (not shown). The temperature control component includes a heating wire, a temperature sensor, and a temperature controller. The heating wire is arranged on the loading plate 11. The temperature sensor is used to sense the temperature on the surface of the loading plate 11. The heating wire generates heat, and the temperature of the loading plate 11 rises. When the temperature on the surface of the loading plate 11 exceeds the preset temperature, the temperature controller controls the output power of the heating wire, so as to ensure that the temperature on the surface of the loading plate 11 is within the preset range. Preferably, the temperature on the surface of the loading plate 11 is controlled within the range of 80 - 150 °C to ensure that the working temperature during the welding process is within a constant range, avoid the influence of the external temperature on the welding quality, and thus improve the stability and controllability of the welding quality. After the temperature on the surface of the loading plate 11 rises to the preset range, the sheet supply device 3 transports the externally glued battery cell 100 to the loading plate 11 and fixes it on the surface of the loading plate 11. Then, the wire supply device 4 transports the externally preset-length wire segment 200 to the lower part of the wire pressing assembly 22, and one external wire segment 200 is located directly below one of the heat conducting sheets 221. Then, drive the welding device 2 to move downward, and the laser welding assembly 21 and the wire pressing assembly 22 move downward synchronously until one heat conducting sheet 221 presses one external wire segment 200 on the surface of the external battery cell 100, and the heat conducting sheet 221 is in contact with the external battery cell 100. The temperature of the heat conducting sheet 211 rises, that is, the surface temperature of the external wire also rises accordingly. The laser welding assembly 21 welds the external wire segment 200 to the external battery cell 100 to meet the welding production requirements. Preferably, the heat conducting sheet 211 can be made of various materials such as graphite, aluminum diamond, silicon carbide, zirconia, alumina, and aluminum nitride ceramics. Finally, the unloading device 5 transports the finished product to the inspection station. The qualified products are transported to the next process, and the unqualified products are recycled, completing the automatic feeding, welding, inspection, and unloading of the wire and the battery cell.

[0073] The laser welding assembly 21 includes a laser, an optical path system, and a galvanometer scanner. The laser generates infrared laser, and the energy generated by the infrared laser acts on the welding wire and the battery cell through the optical path system and the galvanometer scanner to weld the welding wire on the surface of the battery cell. Preferably, the optical path system is a single optical path system or a beam splitting system that combines 1 / N required for welding efficiency. The laser power > 200W, the galvanometer scanner scanning speed > 1000mm / s, and the welding forming pattern can be formed by single-point irradiation of grid lines, line scanning of local small areas of grid lines, and full-area line scanning of the entire grid line.

[0074] By providing a temperature control component on the loading plate 11, the surface temperature of the loading plate 11 is within a preset range during the welding process. By installing a heat conducting sheet 221 on the wire pressing component 22, the heat conducting sheet 221 presses the external welding wire segment 200 on the surface of the external battery cell 100, ensuring the stability of the connection position of the external welding wire segment 200 relative to the battery cell 100. At the same time, the heat of the loading plate 11 is transferred to the heat conducting sheet 221 to control the temperatures of the welding wire segment 200 and the external battery cell 100 within a preset range, improving the stability and controllability of the welding quality of the welding wire and the battery cell.

[0075] Each of the heat conducting sheets 221 includes a wire clamping groove 221a. The wire clamping groove 221a is arranged along the length direction of the heat conducting sheet 221. The width of the wire clamping groove 221a is greater than the outer diameter of the external welding wire segment 200, and the depth of the wire clamping groove 221a is less than the outer diameter of the external welding wire segment 200. The setting of the wire clamping groove 221a further ensures the accuracy of the fitting position of the welding wire segment 200 and the battery cell 100, avoids the welding wire segment 200 from detaching from the wire position, and improves the stability of the welding production quality.

[0076] The wire pressing assembly 22 further includes a fixture body 222 and a connecting member 223. The fixture body 222 is connected to the connecting member 223. The heat conducting sheet 221 is disposed on the fixture body 222. The length direction of the heat conducting sheet 221 intersects with the length direction of the fixture body 222. Preferably, the number of the connecting members 233 is two, and the two connecting members 223 are arranged longitudinally. The number of the fixture bodies 222 is three, and the three fixture bodies 222 are arranged horizontally and parallel to each other. Both ends of the three fixture bodies 222 in the length direction are respectively connected to the connecting member 223. A plurality of heat conducting sheets 221 are installed along the length direction of the fixture body 222. The length direction of the heat conducting sheet 221 is perpendicular to the length direction of the fixture body 222. Preferably, a plurality of card slots 2221 are machined on the fixture body 222, and at least one convex portion 2211 is provided on the heat conducting sheet 221. The convex portion 2211 is installed in the card slot 2221, which improves the assembly convenience of the fixture body 222 and the heat conducting sheet 221. Preferably, the wire pressing assembly 22 further includes an elastic member 224. The elastic member 224 passes through the connecting member 223 and is connected to the fixture body 222. During the working process, when the wire pressing assembly 22 is driven to move downward to press the external battery cell 100 fixed on the loading plate 11, the heat conducting sheet 221 first contacts the external battery cell 100. The fixture body 222 rebounds under the action of the elastic member 224, that is, drives the heat conducting sheet 221 to rebound upward, so that the pressure between the heat conducting sheet 221 and the external battery cell 100 becomes smaller, and the damage to the battery cell 100 caused by the external force instantaneously generated between the heat conducting sheet 221 and the external battery cell 100 is reduced.

[0077] The fixture body 222 includes a plurality of mounting members 222a. The adjacent two mounting members 222a are arranged in parallel at a certain interval. Each mounting member 222a is connected to the connecting member 223. The arrangement of the plurality of mounting members 222a facilitates selecting a suitable number of mounting members 222a according to needs, meets the welding requirements of different specifications of battery cells and different numbers of welding wires, and improves the production flexibility.

[0078] Each heat conducting sheet 221 includes a plurality of sheet bodies 221x. The plurality of sheet bodies 221x are arranged in a straight line. One sheet body 221x is connected to one mounting member 222a. Each heat conducting sheet 221 is composed of a plurality of sheet bodies 221x, which facilitates selecting a suitable number of sheet bodies 221x according to needs, meets the welding requirements of different specifications of battery cells and different numbers of welding wires, improves the production flexibility, and at the same time facilitates the maintenance and replacement of the heat conducting sheet 221, and improves the stability of the production quality.

[0079] The length of each sheet body 221x is less than 250 mm, which is convenient for controlling the straightness of each sheet body 221x, that is, controlling the degree of contact between the sheet body 221x and the battery cell 100, and improving the stability of the production quality.

[0080] The thickness of each heat conducting sheet 221 is less than 5 mm to ensure good heat conduction effect.

[0081] The material loading plate 11 includes a plate body and a vacuum generator. The plate body is provided with air holes, and the vacuum generator is communicated with the air holes. The external battery sheet 100 is fixed on the surface of the material loading plate 11 by using a vacuum suction structure.

[0082] Please refer to Figure 2-1 , the sheet feeding device 3 includes a workbench 31, a sheet material correction assembly 32, a first linear guide rail 33, a glue sticking slide table 34, a first manipulator 35, a glue supply and sticking assembly 36 and a second manipulator 37. The sheet material correction assembly 32 is arranged on the workbench 31, the first linear guide rail 33 is arranged on the workbench 31, the glue sticking slide table 34 is slidably connected to the first linear guide rail 33, the first manipulator 35 is arranged on the workbench 31 and transports the external battery sheet of the sheet material correction assembly 32 to the glue sticking slide table 34. The glue supply and sticking assembly 36 is arranged on the workbench 31 and above the first linear guide rail 33. The second manipulator 37 transports the externally glued battery sheet 100 to the material loading plate 11. The sheet material correction assembly 32 includes a conveying line body and a detection and correction member. The external battery sheets 100 are sequentially conveyed on the conveying line body. The detection and correction member corrects the external battery sheets conveyed by the conveying line body to ensure the accuracy of the first manipulator 35 in picking up the battery sheets. The conveying line body is arranged parallel to the first linear guide rail 33. The first manipulator 35 transports the corrected battery sheets to the glue sticking slide table 34. The glue sticking slide table 34 is slidably connected to the first linear guide rail 33, so that the glue sticking slide table 34 moves back and forth between the glue supply and sticking assembly 36 and the second manipulator 37. When the glue sticking slide table 34 carries a plurality of external battery sheets and slides below the glue supply and sticking assembly 36, the glue supply and sticking assembly 36 sequentially pulls, cuts and presses the external rubber strips until the cut rubber sheets are pressed onto the surfaces of the external battery sheets on the glue sticking slide table 34, and adjacent two battery sheets are glued into a group. After the glue sticking is completed, the glue sticking slide table 34 moves along the first linear guide rail 33 to below the second manipulator 37, and the second manipulator 37 transports the two serially connected battery sheets to the material loading plate 11 to complete the loading of the battery sheet 100.

[0083] Please refer to Figures 3-1 to 3-10, the wire supply device 4 includes a second linear guide rail 41, a wire reel holder 42, a traction assembly 43, a wire cutting assembly 44 and a wire transfer assembly 45. The second linear guide rail 41 is arranged in parallel with the first linear guide rail 33. The traction assembly 43 is slidably connected to the second linear guide rail 41. The length direction of the wire cutting assembly 44 is arranged in parallel with the length direction of the second linear guide rail 41. The wire reel holder 42 is arranged near the end of the second linear guide rail 41. The wire transfer assembly 45 transports the cut welding wire segments 200 to directly below the heat conducting sheet 221. The traction assembly 43 includes an end wire clamping member 431 and a welding wire fixed end 432. Both the end wire clamping member 431 and the welding wire fixed end 432 are arranged on the second linear guide rail 41. The external welding wire strip is fed by the wire reel holder 42. The welding wire strip passes through the welding wire fixed end 432 and is clamped and pulled out by the end wire clamping member 431. The end wire clamping member 431 slides along the second linear guide rail 41. The end wire clamping member 431 places the welding wire strip on the wire cutting assembly 44. The wire cutting assembly 44 cuts the welding wire strip into welding wire segments 200 of a preset length. Finally, the wire transfer assembly 45 transports a plurality of welding wire segments 200 to directly below the heat conducting sheet 221 to complete the wire supply requirement.

[0084] The wire cutting assembly 44 includes a third linear guide rail 441, a plurality of first sliding seats 442, a plurality of first wire clamping members 443 and a plurality of cutting knife members 444. The plurality of first sliding seats 442 are arranged in sequence along the length direction of the third linear guide rail 441. Two first wire clamping members 443 and one cutting knife member 444 are arranged on one first sliding seat 442. The cutting knife member 444 is arranged between the two first wire clamping members 443. The first sliding seat 442 is slidably connected to the third linear guide rail 441. Each first sliding seat 442 includes two first wire clamping members 443 and one cutting knife member 444. When the external welding wire strip is clamped by the plurality of first wire clamping members 443, the cutting knife member 444 cuts the welding wire strip to form a plurality of welding wire segments 200. The distance between two adjacent first sliding seats 442 is adjusted as needed to cut the welding wire segments 200 into different specifications to meet different production requirements.

[0085] The cutting tool member 444 includes a first lifting drive source 4441, a slicing member 4442, a first horizontal drive source 4443, and a wire pressing member 4444. The first horizontal drive source 4443 drives the wire pressing member 4444 to move horizontally. The first lifting drive source 4441 drives the slicing member 4442 to move longitudinally so that the slicing member 4442 is tangent to the wire pressing member 4444. Preferably, the wire pressing member 4444 includes a plate member and a plurality of L-shaped pressing blocks. The L-shaped pressing blocks protrude from the plate member and are located on the same side of the plate member. The distance between adjacent two L-shaped pressing blocks is set. The first horizontal drive source 4443 drives the wire pressing member 4444 to move horizontally to avoid the process that the traction assembly 43 pulls out the external wire strip and moves downward so that the wire strip enters the central axis of the first wire clamping member 443. When the external wire strip is clamped by the first wire clamping member 443, the first horizontal drive source 4443 drives the wire pressing member 4444 to move horizontally so that the wire pressing member 4444 presses the external wire strip. Then, the first lifting drive source 4441 drives the slicing member 4442 to move upward, and the slicing member 4442 is tangent to the wire pressing member 4444 to form a cutting tool, completing the cutting of the wire strip.

[0086] The wire cutting assembly 44 further includes a plurality of second sliding seats 445 and a plurality of second wire clamping members 446. The second sliding seats 445 are slidably connected to the third linear guide rail 441. One second sliding seat 445 is arranged between adjacent two first sliding seats 442. One second wire clamping member 446 is arranged on one second sliding seat 445. The second wire clamping member 446 is located in the middle of two first wire clamping members 443, so that three points of a wire segment 200 are clamped, ensuring the stability of the wire segment 200 before being picked up by the wire handling assembly 45. Preferably, the second wire clamping member 446 and the first wire clamping member 443 have the same structure and both include a driving cylinder, a left clamp, and a right clamp. The driving cylinder drives the left clamp and the right clamp to open and close to achieve the purpose of clamping and releasing the wire segment.

[0087] The wire handling assembly 45 includes a second lifting drive source 451, a main board 452, a plurality of support boards 453, and a plurality of clamping claws 455. The second lifting drive source 451 drives the main board 452 to lift and lower. The plurality of support boards 453 are arranged along the length direction of the main board 452. The plurality of clamping claws 455 are arranged on one support board 453. The second lifting drive source 451 drives the main board 452 to lift and lower so that two clamping claws 445 of adjacent two support boards 453 clamp a wire segment 200. Under the action of an external lateral drive source, the support board 453 moves to directly above the loading plate 11 so that the wire segment 200 is located directly below the wire clamping groove 221a.

[0088] The soldering station device 1 further includes a fourth linear guide rail 12. The material loading plate 11 is slidably connected to the linear guide rail 12. The fourth linear guide rail 12 is arranged in parallel with the second linear guide rail 41. The number of the soldering station devices 1 is two. The two material loading plates 11 move alternately below the welding device 2 to achieve the purpose of interactive feeding and improve production efficiency.

[0089] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for indirect string welding of battery cells, characterized in that: The invention comprises a soldering station device (1), a welding device (2), a sheet supply device (3), a wire supply device (4) and a material discharge device (5); the soldering station device (1) is provided with a material carrier plate (11) and a temperature control component; the welding device (2) is provided with a laser welding component (21) and a wire pressing component (22); the wire pressing component (22) comprises a plurality of heat conducting sheets (221); and the welding steps are as follows: Temperature adjustment step: adjusting the working temperature of the carrier plate (11) by a temperature control component, the temperature setting range: 0-200°; Plate placement step: the sheet supply device (3) fixes the external battery sheet (100) on the carrier plate (11); Distance adjustment step: adjusting the distance between two adjacent heat conducting plates (221) of the wire pressing assembly (22) so that the distance between the two adjacent heat conducting plates (221) is the same as the distance between two adjacent welding wire segments (200) in the outside world; Transporting step: the wire feeding device (4) transports the external welding wire segment (200) to the bottom of the wire pressing assembly (22), and one external welding wire segment (200) is located directly below one of the heat conducting sheets (221); Positioning step: driving the welding device (2) to move downward so that a heat conductive sheet (221) presses an external welding wire segment (200) against the surface of the external battery sheet (100), and the heat conductive sheet (221) and the external battery sheet (100) are attached to each other; Welding step: a laser welding assembly (21) welds the external welding wire segment (200) to the external battery cell (100); Unloading step: The unloading device (5) inspects the finished product after welding and transfers it to the next process.

2. The method for indirect series welding of battery cells according to claim 1, characterized in that: Each of the heat conducting plates (221) comprises a wire retaining groove (221a), the wire retaining groove (221a) being arranged along the length direction of the heat conducting plate (221), the width of the wire retaining groove (221a) being greater than the outer diameter of the outer welding wire segment (200), and the depth of the wire retaining groove (221a) being less than the outer diameter of the outer welding wire segment (200).

3. The method for indirect series welding of battery cells according to claim 1, characterized in that: The wire pressing assembly (22) further comprises a jig body (222) and a connecting piece (223), wherein the jig body (222) is connected to the connecting piece (223), the heat conducting sheet (221) is arranged on the jig body (222), and the length direction of the heat conducting sheet (221) intersects with the length direction of the jig body (222); The fixture body (222) comprises a plurality of mounting members (222a), two adjacent mounting members (222a) are arranged in parallel and at intervals, and each mounting member (222a) is connected to a connecting member (223).

4. The method for indirect series welding of battery cells according to claim 1, characterized in that: The sheet supply device (3) comprises a workbench (31), a sheet correction component (32), a first linear guide rail (33), a glue sticking slide (34), a first manipulator (35), a glue supply and glue sticking component (36) and a second manipulator (37). The sheet correction component (32) is arranged on the workbench (31), the first linear guide rail (33) is arranged on the workbench (31), the glue sticking slide (34) is slidably connected to the first linear guide rail (33), the first manipulator (35) is arranged on the workbench (31) and transfers the external battery sheet of the sheet correction component (32) to the glue sticking slide (34), the glue supply and glue sticking component (36) is arranged on the workbench (31) and above the first linear guide rail (33), and the second manipulator (37) transfers the external battery sheet (100) after glue sticking to the carrier plate (11).

5. The method for indirect serial welding of battery cells according to claim 4, characterized in that: The wire feeding device (4) comprises a second linear guide rail (41), a wire reel rack (42), a traction assembly (43), a wire cutting assembly (44) and a wire moving assembly (45); the second linear guide rail (41) is arranged in parallel with the first linear guide rail (33); the length direction of the wire cutting assembly (44) is arranged in parallel with the length direction of the second linear guide rail (41); the wire reel rack (42) is arranged close to the end of the second linear guide rail (41); the traction assembly (43) is slidably connected to the second linear guide rail (41); and the wire moving assembly (45) transfers the cut welding wire segment (200) to the bottom of the heat conducting plate (221).

6. The method for indirect series welding of battery cells according to claim 5, characterized in that: The wire cutting assembly (44) comprises a third linear guide rail (441), a plurality of first slide seats (442), a plurality of first wire clamping members (443) and a plurality of cutting blade members (444), wherein the plurality of first slide seats (442) are arranged in sequence along the length direction of the third linear guide rail (441); The two first wire clamping members (443) and the one cutting member (444) are arranged on a first sliding seat (442), and the cutting member (444) is arranged between the two first wire clamping members (443).

7. The method for indirect series welding of battery cells according to claim 6, characterized in that: The cutting blade (444) includes a first lifting drive source (4441), a slice (4442), a first horizontal drive source (4443) and a wire pressing piece (4444), wherein the first horizontal drive source (4443) drives the wire pressing piece (4444) to move horizontally, and the first lifting drive source (4441) drives the slice (4442) to move longitudinally so that the slice (4442) is tangent to the wire pressing piece (4444).

8. The method for indirect serial welding of battery cells according to claim 6, characterized in that: The wire cutting assembly (44) further comprises a plurality of second slides (445) and a plurality of second wire clamping members (446), wherein the second slides (445) are slidably connected to the third linear guide rail (441), a second slide (445) is arranged between two adjacent first slides (442), and a second wire clamping member (446) is arranged on a second slide (445).

9. The method for indirect serial welding of battery cells according to claim 8, characterized in that: The wire moving assembly (45) comprises a second lifting drive source (451), a main board (452), a plurality of support plates (453) and a plurality of clamping claws (454); the second lifting drive source (451) drives the main board (452) to lift and lower; the plurality of support plates (453) are arranged along the length direction of the main board (452); and the plurality of clamping claws (454) are arranged on one of the support plates (453).

10. The method for indirect serial welding of battery cells according to claim 5, characterized in that: The soldering station device (1) further comprises a fourth linear guide rail (12), the carrier plate (11) is slidably connected to the linear guide rail (12), and the fourth linear guide rail (12) is arranged parallel to the second linear guide rail (41).

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