Welding device

Abstract

The invention relates to the technical field of battery production, and discloses a welding device which comprises a positioning mechanism, a clamping mechanism and the positioning mechanism are matched to clamp a battery cell, a transfer mechanism transfers a connecting piece to a preset welding position of the battery cell, and a bending mechanism is used for driving two positive tabs to be bent oppositely. The battery cell to be welded is accurately fixed through the positioning mechanism, the bending mechanism drives the two positive electrode tabs to be bent oppositely, the defects of insufficient welding, tab tearing and the like are effectively overcome, the welding yield is remarkably improved, and the battery cell welding device is suitable for production of large-capacity different-side pole square shell batteries; large-capacity improvement of the battery is achieved through the unique structure of the tabs and the connecting pieces, a single-machine mode and an automatic mode can be achieved at the same time, assembly line production can be achieved through feeding and discharging of materials through a mechanical arm in the automatic mode, and the whole device is simple in structure, low in failure rate and easy to maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, and in particular to a welding device. BACKGROUND

[0002] With the application scenarios of power batteries and energy storage batteries becoming more and more extensive, large-capacity battery cells can reduce the use of PACK end components, simplify the assembly process, and at the same time improve the energy density, thereby reducing the system cost while reducing the integration difficulty. Energy storage systems require high-energy-density batteries to improve energy storage efficiency, while power batteries require high-endurance batteries to reduce charging frequency and improve user experience. However, for the opposite side pole cylindrical shell, the thickness of such battery cells is getting thicker, which is limited by the size of the battery internal tab, and it is difficult to achieve large-capacity production of the battery structure.

[0003] The positive and negative tabs of such opposite side pole cylindrical shell battery are arranged on opposite sides, the positive tabs of two battery cells are arranged opposite to each other, two positive tabs are respectively folded 90° to the center side, and then welded with the connecting piece, while the negative tab is directly welded with the cover plate. When the battery cell is thickened, the bending difficulty of the two tabs of the opposite side pole is increased, and problems such as inaccurate positioning, virtual welding, and tab tearing are prone to occur when welding with the connecting piece. The traditional welding device cannot adapt to the welding needs of large-capacity battery cells, resulting in low production yield and inability to achieve large-capacity production on a large scale. SUMMARY

[0004] The purpose of the present application is to provide a welding device to solve the problems in the prior art, which can realize the welding of the tabs and the connecting piece of the opposite side pole structure battery, and can be operated safely and conveniently.

[0005] The present application provides a welding device, comprising: A positioning mechanism for positioning two mirror image adhered battery cells, the positive tabs of the two battery cells are located on the outer side; A clamping mechanism comprising a pressing assembly and a first driving assembly, the first driving assembly is used to drive the pressing assembly to move, and cooperates with the positioning mechanism to clamp the battery cell; A transfer mechanism comprising a supporting assembly and a second driving assembly, the supporting assembly is used to carry the connecting piece, and the second driving assembly is used to drive the supporting assembly to move to transfer the connecting piece to the preset welding position of the battery cell; A bending mechanism for driving two positive tabs to bend towards each other; A welding mechanism for welding the two bent positive tabs and the connecting piece.

[0006] The welding device as claimed in any one of the preceding claims, wherein the positioning mechanism preferably comprises a base and a third driving assembly. The base is provided with a receiving portion for accommodating the battery cell, and the receiving portion is arranged in an L shape. The clamping mechanism is arranged opposite to the opening side of the receiving portion, and is used for pressing the battery cell into the receiving portion, and the side of the receiving portion facing the battery cell is provided with a material taking groove. The third driving assembly presses the battery cell via the other opening side of the receiving portion.

[0007] The welding device as claimed in any one of the preceding claims, wherein the first driving assembly preferably comprises a first cylinder and a first guide portion, the pressing assembly is in sliding connection with the first guide portion, and the first cylinder is used for driving the pressing assembly to move along the first guide portion.

[0008] The welding device as claimed in any one of the preceding claims, wherein the pressing assembly preferably comprises a support and a pressing portion, the pressing portion is arranged on the side of the support facing the receiving portion, and the welding mechanism is arranged on the top of the support and corresponds to the welding position when the pressing assembly presses the battery cell.

[0009] The welding device as claimed in any one of the preceding claims, wherein the second driving assembly preferably comprises a second cylinder and a second guide portion, the supporting assembly is in sliding connection with the second guide portion, and the second cylinder is used for driving the supporting assembly to move along the second guide portion.

[0010] The welding device as claimed in any one of the preceding claims, wherein the supporting assembly preferably comprises a lifting driving member and a supporting portion. The supporting portion is arranged on the output end of the lifting driving member, the lifting driving member is used for driving the supporting portion to lift and lower, and the supporting portion is configured to contact and drive the two positive electrode tabs to approach each other in the process of lowering from the first position to the second position.

[0011] The welding device as claimed in any one of the preceding claims, wherein the supporting portion is provided with a positioning portion for positioning the position of the connecting tab and a suction portion for suctioning or releasing the connecting tab.

[0012] The welding device as claimed in any one of the preceding claims, wherein the bending mechanism preferably comprises a first bending portion and a second bending portion. The first bending portion is arranged on the clamping mechanism and moves synchronously with the pressing assembly, and bends the positive electrode tab on one side in the process of moving. The second bending portion is movably arranged on the positioning mechanism, and the second bending portion can approach the positive electrode tab on the other side to bend the positive electrode tab on the other side.

[0013] The welding device as described above, preferably, the bending mechanism further comprises a third cylinder, the fixed end of the third cylinder is connected with the positioning mechanism, the second bending part is arranged at the output end of the third cylinder, and the third cylinder is used to drive the second bending part to move.

[0014] The welding device as described above, preferably, the welding device further comprises a laser welding galvanometer mechanism and a control mechanism. The laser welding galvanometer mechanism is arranged at the top of the welding position. The output end of the control mechanism is connected with the input end of at least the laser welding galvanometer mechanism, the first driving assembly, the second driving assembly and the third driving assembly.

[0015] Compared with the prior art, the application accurately fixes the to-be-welded battery cell through the positioning mechanism, and drives the two positive lug tabs to be bent towards each other through the bending mechanism, thereby solving the problems of great difficulty in bending the lug tabs after the battery cell is thickened and inaccurate positioning, effectively avoiding defects such as virtual welding and lug tab tearing, significantly improving the welding yield, and adapting to large-capacity opposite-pole column square shell battery production. Through the cooperation of the clamping mechanism, the transfer mechanism and the welding mechanism, the whole process of battery cell clamping, connecting piece transferring, lug tab bending and welding is automatically completed, the large-capacity battery cell welding limitation of the traditional device is broken through, and the large-scale production demand is met. In addition, the application realizes the improvement of the capacity of the battery through the unique structure of the lug tab and the connecting piece, and can realize the single-machine mode and the automatic mode at the same time. In the automatic mode, the materials can be realized through the mechanical hand up and down, the whole device structure is simple, the failure rate is low, and the device is easy to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the front view of the welding device provided by the embodiment of the application; Figure 2 is the schematic view of the preset welding position provided by the embodiment of the application; Figure 3 is the top view of the positioning mechanism provided by the embodiment of the application; Figure 4 is the Figure 3 exploded view; Figure 5 is the front view of the clamping mechanism provided by the embodiment of the application; Figure 6 is the front view of the transfer mechanism provided by the embodiment of the application; Figure 7 is the state diagram of the connecting piece reaching the first position provided by the embodiment of the application; Figure 8 is the state diagram of the connecting piece reaching the second position provided by the embodiment of the application; Figure 9 is a state diagram of the welding of the connecting piece and the tab provided by the embodiment of the present application.

[0017] BRIEF DESCRIPTION OF DRAWINGS 10, positioning mechanism; 11, base; 110, containing portion; 111, material taking groove; 12, third driving assembly; 20, clamping mechanism; 21, pressing assembly; 210, support; 211, pressing portion; 22, first driving assembly; 220, first cylinder; 221, first guide portion; 30, transfer mechanism; 31, supporting assembly; 310, lifting driving piece; 311, supporting portion; 312, positioning portion; 313, adsorbing portion; 32, second driving assembly; 320, second cylinder; 321, second guide portion; 40, bending mechanism; 41, first bending portion; 42, second bending portion; 43, third cylinder; 50, welding mechanism; 51, welding copper pressure head; 52, fourth cylinder; 60, workbench; 61, laser welding galvanometer mechanism; 62, control mechanism; 70, electric core; 71, positive tab; 72, connecting piece; 73, preset welding area; D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0018] The embodiments described below by reference to the drawings are exemplary only and are intended to explain the present application, but cannot be interpreted as a limitation of the present application.

[0019] Referring to Figure 2 shown, for large-capacity square cell, the positive tab 71 and the negative tab are arranged on the opposite sides, therefore, usually, two electric cores 70 are arranged in mirror image, the positive tabs 71 are opposite to each other, the negative tabs are opposite to each other, and the two positive tabs 71 are bent to 90° towards the opposite side, the connecting piece 72 is sent to the two positive tabs 71, the electric core 70 and the connecting piece 72 are kept at a certain distance, the electric core 70 is prevented from being stressed, then the welding of the positive tab 71 and the connecting piece 72 is carried out, and the negative tab is directly welded with the cover plate. When facing the electric core 70 with such a special structure, the existing welding device is difficult to complete the bending and welding in the same device, needs to be completed in multiple processes, and it is difficult to ensure that the connecting piece 72 and the upper surface of the electric core 70 keep a certain distance during welding, in addition, it is also difficult to ensure the precision of the welding position, which may cause problems such as welding deviation, false welding, and tab tearing.

[0020] Referring to Figure 1As shown, the embodiment provides a welding device, which comprises a positioning mechanism 10, a clamping mechanism 20, a transfer mechanism 30, a bending mechanism 40 and a welding mechanism 50, wherein: The welding device is integrated on the workbench 60, facilitating the installation and fixation of each mechanism and the movement of the whole device, without the need for multiple process operations, and can complete the tab bending and welding in the same device, greatly shortening the production process.

[0021] The positioning mechanism 10 is used for positioning two mirror image-arranged battery cells 70, and the positive tabs 71 of the two battery cells 70 are located on the outer side; the clamping mechanism 20 comprises a pressing assembly 21 and a first driving assembly 22, the first driving assembly 22 is used for driving the pressing assembly 21 to move, and cooperates with the positioning mechanism 10 to clamp the battery cell 70; the transfer mechanism 30 comprises a supporting assembly 31 and a second driving assembly 32, the supporting assembly 31 is used for bearing the connecting piece 72, and the second driving assembly 32 is used for driving the supporting assembly 31 to move, so as to transfer the connecting piece 72 to a preset welding position of the battery cell 70; the bending mechanism 40 is used for driving the two positive tabs 71 to bend towards each other; and the welding mechanism 50 is used for welding the two bent positive tabs 71 and the connecting piece 72.

[0022] In the embodiments provided in the present application, the positioning mechanism 10 is used for receiving and accurately fixing two mirror image-arranged battery cells 70, the clamping mechanism 20 cooperates with the positioning mechanism 10 to clamp the large face of the battery cell 70, preventing the battery cell 70 from deviating during welding, solving the virtual welding or welding deviation caused by the inaccurate traditional welding positioning, the transfer mechanism 30 directly transfers the connecting piece 72 to the two positive tabs 71, the supporting assembly 31 bears the connecting piece 72 during welding to keep it at the preset welding position, avoiding the connecting piece 72 from contacting or pressing the surface of the battery cell 70 during welding, the bending mechanism 40 drives the positive tabs 71 of the two battery cells 70 to bend towards each other to 90°, forming an overlapping interface with the connecting piece 72, and finally the welding mechanism 50 completes welding on the preset welding area 73, the device has simple structure, is convenient to use, and meets the welding requirements of large-capacity battery cells.

[0023] For the convenience of description, the first direction D1, the second direction D2 and the third direction D3 are introduced in the embodiment to introduce the arrangement of the device and the moving direction of each mechanism, wherein the first direction D1 is the vertical direction of the workbench 60, the second direction D2 is the horizontal direction of the workbench 60, and the third direction D3 is the front-back direction of the workbench 60. It should be noted that the device is not limited to the above-mentioned arrangement of directions.

[0024] Referring to Figures 3-4As shown, in some embodiments of the present application, the positioning mechanism 10 comprises a base 11 and a third driving assembly 12, the base 11 is provided with a receiving portion 110 for accommodating the battery cell 70, the receiving portion 110 is arranged in an L shape. The receiving portion 110 extends along the first direction D1 and the second direction D2 to form an L-shaped structure, the battery cell 70 can be attached to the two sides respectively in the receiving portion 110, providing a positioning reference for the battery cell 70, and the receiving portion 110 is open at the top and the diagonal of the L-shaped structure. The large faces of the two battery cells 70 face the second direction D2, and the narrow faces of the battery cells 70 face the third direction D3, and the positive electrode tabs 71 of the two battery cells 70 are symmetrically arranged along the third direction D3.

[0025] Referring to Figure 1 As shown, the clamping mechanism 20 is arranged on one side of the positioning mechanism 10, and the clamping mechanism 20 is arranged opposite to the opening side of the receiving portion 110, for pressing the battery cell 70 into the receiving portion 110, and the clamping mechanism 20 presses one large face of the battery cell 70 to form a three-face constraint, further preventing the movement of the battery cell 70.

[0026] Referring to Figure 4 As shown, further, the third driving assembly 12 presses the battery cell 70 through the other opening side of the receiving portion 110, and the third driving assembly 12 can adopt a pneumatic cylinder, and the driving end of the pneumatic cylinder is provided with a push plate, and the third driving assembly 12 presses the battery cell 70 along the third direction D3, thereby realizing the positioning of the narrow face of the battery cell 70. The base 11, the third driving assembly 12 and the clamping mechanism 20 cooperate to ensure that the battery cell 70 remains in a fixed state from the initial to the welding completion, avoiding welding deviation or virtual welding caused by displacement of the battery cell 70, and when the third driving assembly 12 and the clamping mechanism 20 are away from the battery cell 70, the battery cell 70 is also convenient to take out, which can be manually fed or unloaded by a mechanical hand, which is not limited here.

[0027] Referring to Figure 4 As shown, in order to avoid loss of the pole piece when taking out the battery cell 70, the side of the battery cell 70 receiving portion 110 facing the battery cell 70 is provided with two material taking grooves 111 extending along the first direction D1, which can separate the battery cell 70 from the receiving portion 110 without affecting the positioning function of the receiving portion 110.

[0028] Referring to Figure 5 As shown, in this embodiment, the first driving assembly 22 comprises a first pneumatic cylinder 220 and a first guide portion 221, and the pressing assembly 21 is in sliding connection with the first guide portion 221, and the first pneumatic cylinder 220 is used to drive the pressing assembly 21 to move along the first guide portion 221. The first guide portion 221 can adopt the cooperation of a sliding block and a sliding rail, or a linear guide rail, etc., for providing accurate guidance to ensure the linear movement of the pressing assembly 21 along the sliding rail.

[0029] Referring to Figure 5As shown, the pressing assembly 21 includes a bracket 210 and a pressing part 211, the pressing part 211 is arranged on the side of the bracket 210 facing the accommodating part 110, and the welding mechanism 50 is arranged on the top of the bracket 210 and corresponds to the welding position when the pressing assembly 21 presses the battery cell 70. The pressing part 211 adopts a flat pressing plate, when the first cylinder 220 drives the pressing assembly 21 to approach the battery cell 70, the pressing plate presses the large surface of the battery cell 70 through the opening side of the accommodating part 110.

[0030] Referring to Figure 6 As shown, in some embodiments of the present application, the second driving assembly 32 includes a second cylinder 320 and a second guide part 321, the support assembly 31 is in sliding connection with the second guide part 321, and the second cylinder 320 is used to drive the support assembly 31 to move along the second guide part 321. The second guide part 321 can adopt the cooperation of a sliding block and a sliding rail, or a linear guide rail, etc., and the second cylinder 320 drives the support assembly 31 to move along the third direction D3 to deliver the connecting piece 72 to between the two positive electrode tabs 71.

[0031] Referring to Figure 6 As shown, in the present embodiment, the support assembly 31 includes a lifting driving member 310 and a support part 311; the support part 311 is arranged on the output end of the lifting driving member 310, the lifting driving member 310 is used to drive the support part 311 to lift and lower, and the support part 311 is configured to contact and drive the two positive electrode tabs 71 to approach each other during the process of lowering from the first position to the second position. Although the bending mechanism 40 is arranged in the present application to drive the tab bending, direct bending will damage the tab, therefore, by adding a lifting driving member 310 to drive the support part 311 to lift and lower along the first direction D1, referring to Figure 7 As shown, when the support part 311 carries the connecting piece 72 to move horizontally above the welding position, the distance between the support part 311 and the battery cell 70 is H, referring to Figure 8 As shown, the lifting driving member 310 drives the support part 311 to lower to the working position, at this time, the distance between the support part 311 and the battery cell 70 becomes H1. During this lowering process, the support part 311 will first contact the two outward positive electrode tabs 71, and use its downward action to preliminarily make the two positive electrode tabs 71 approach each other, to prepare for subsequent bending, and at the same time, to ensure good contact between the connecting piece 72 and the tab.

[0032] Referring to Figure 6As shown, the connecting piece 72 is relatively light, in order to ensure that the position of the connecting piece 72 remains stable during movement, in the embodiment, the support portion 311 is provided with a positioning portion 312 for positioning the position of the connecting piece 72, and a suction portion 313 for suctioning or releasing the connecting piece 72. The positioning portion 312 is a sunken step formed at the front end of the support portion 311, the connecting piece 72 is placed on the support portion 311, and the consistent position is achieved by abutting against the positioning portion 312. The suction portion 313 is a plurality of vacuum holes formed on the support plate, and the inside is connected to vacuum, so as to achieve suction and release of the connecting piece 72, and ensure that the connecting piece 72 always remains in a stable state during movement and welding.

[0033] Referring to Figure 5 and Figures 8-9 As shown, in some embodiments of the present application, the bending mechanism 40 includes a first bending portion 41 and a second bending portion 42; the first bending portion 41 is arranged on the clamping mechanism 20 and moves synchronously with the pressing assembly 21, and bends one side of the positive electrode tab 71 during movement; the second bending portion 42 is movably arranged on the positioning mechanism 10, and the second bending portion 42 can be close to the other side of the positive electrode tab 71 to bend the other side of the positive electrode tab 71. The first bending portion 41 and the second bending portion 42 can be flat pressing plates. When the clamping mechanism 20 moves towards the battery cell 70, the first bending portion 41 is driven to move synchronously, before or at the same time when the abutting portion 211 contacts the battery cell 70, the first bending portion 41 contacts one side of the positive electrode tab 71 and presses it inwardly to 90°. The first bending portion 41 protrudes from the side of the support 210 facing the positioning mechanism 10. The second bending portion 42 bends the other side of the positive electrode tab 71 through independent movement.

[0034] Referring to Figure 8 As shown, in a feasible embodiment, the bending mechanism 40 further includes a third cylinder 43, the fixed end of the third cylinder 43 is connected with the base 11 of the positioning mechanism 10, and the second bending portion 42 is arranged on the output end of the third cylinder 43. The third cylinder 43 is used to drive the second bending portion 42 to move. When bending is needed, the third cylinder 43 acts to drive the second bending portion 42 to move towards the other side of the positive electrode tab 71 and bend it inwardly. Through the synchronous bending of the first bending portion 41 and the active driving bending of the second bending portion 42, efficient opposite bending actions of the two tabs are realized, the bending angles are consistent, and the forces are balanced. It should be noted that the first bending portion 41 and the second bending portion 42 only need to ensure that the bending angles of the two positive electrode tabs 71 are consistent and the postures after bending are the same, and whether the bending actions are performed synchronously is not limited.

[0035] Referring to Figure 1As shown in the embodiment, the welding mechanism 50 can adopt laser welding, and the welding device is further provided with a laser welding galvanometer mechanism 61 and a control mechanism 62. The laser welding galvanometer mechanism 61 is fixedly installed on the top of the frame of the workbench 60, and the laser output head thereof is located directly above the preset welding area 73. The welding mechanism 50 comprises a fourth cylinder 52 and a welding copper pressure head 51 which is installed on the support 210 of the clamping mechanism 20. The lower end surface of the welding copper pressure head 51 is used to press the tab and the connecting piece 72, and an internal vertical through hole is arranged in the welding copper pressure head 51, and the position of the through hole is coaxially aligned with the light path of the light output of the laser welding galvanometer mechanism 61. When the clamping mechanism 20 drives the pressing part 211 to move to the position and the welding copper pressure head 51 is driven to descend and press the workpiece by the fourth cylinder 52, the laser beam emitted from the top laser welding galvanometer mechanism 61 can pass through the vertical through hole of the welding copper pressure head 51 and reach the pressed welding area. The welding copper pressure head 51 is further integrated with a nitrogen protection channel and a dust removal channel around the through hole to assist the welding.

[0036] The laser welding galvanometer mechanism 61 is integrated with a galvanometer scanning head and a focusing mirror, and the laser beam is precisely scanned and welded in the preset welding area 73 through program control. It should be noted that the laser welding galvanometer mechanism 61, the control mechanism 62 and the cylinders, guide parts and the like contained therein can all be realized by using mature components or modules in the art. The innovation of the present application lies in the innovative layout and collaborative control method of the above-mentioned mechanism to solve the welding problem of large-capacity opposite-pole column battery cells 70.

[0037] Referring to Figure 1 As shown, the control mechanism 62 comprises an upper computer which is installed on the side of the workbench 60, and the control mechanism 62 uses software to integrate the control of the cylinder action and the laser welding. The output end of the control mechanism 62 is connected with the input ends of the laser welding galvanometer mechanism 61, the first driving assembly 22, the second driving assembly 32 and the third driving assembly 12.

[0038] Based on the above embodiment, the working principle of the welding device of the present application is as follows: The operator or the mechanical hand puts the two mirror image bonded battery cells 70 into the base 11, the third driving assembly 12 moves to the battery cell 70 and drives the battery cell 70 to be close to the accommodating part 110, the connecting sheet 72 is placed on the support plate, is positioned by the positioning part 312 and is fixed by the adsorption part 313, the second cylinder 320 drives the support plate to move on the second guide part 321, until the connecting sheet 72 is transported to the preset welding position between the two positive pole tabs 71, the support plate is partially in contact with the positive pole tabs 71, the lifting driving part 310 drives the support plate to descend, the distance between the support plate and the upper surface of the battery cell 70 changes from H to H1, and in the moving process, the support plate presses the two positive pole tabs 71 to move towards each other, the positive pole tabs 71 are bent to a certain extent, the first cylinder 220 drives the pressing part 211 to move on the first guide part 221, when the pressing part 211 is completely bonded to the surface of the battery cell 70, the first bending part 41 drives the one side positive pole tab 71 to be bent to 90°, and the welding copper pressure head 51 is located at the top of the preset welding position, at the same time, the third cylinder 43 drives the second bending part 42 to move, until the second bending part 42 bends the other side positive pole tab 71 to 90°, the fourth cylinder 52 drives the welding copper pressure head 51 to descend and press the positive pole tab 71 and the connecting sheet 72, the laser welding galvanometer mechanism 61 controls the deflection of the internal galvanometer sheet by program, guides the focal point of the same laser beam to scan in the welding area of the left side and the right side in turn, so as to complete the welding of the two side positive pole tabs 71 and the connecting sheet 72 respectively.

[0039] The above embodiment according to the drawings details the structure, features and effects of the present application, the above description is only the preferred embodiment of the present application, but the present application is not limited to the drawings shown, any change or modification made according to the idea of the present application, or the equivalent embodiment of equivalent change, still within the scope of the present application.

Claims

1. A welding apparatus, characterized in that, include: A positioning mechanism is used to position two mirror-fitted battery cells, with the positive electrode tabs of both cells located on the outer side; The clamping mechanism includes a pressing component and a first driving component, wherein the first driving component is used to drive the pressing component to move and cooperate with the positioning mechanism to clamp the battery cell. The transfer mechanism includes a support component and a second drive component. The support component is used to carry the connecting piece, and the second drive component is used to drive the support component to move so as to transfer the connecting piece to a preset welding position of the battery cell. A bending mechanism is used to drive the two positive electrode tabs to bend towards each other; A welding mechanism is used to weld the two bent positive electrode tabs to the connecting piece.

2. The welding apparatus according to claim 1, characterized in that, The positioning mechanism includes a base and a third drive assembly; The base is provided with a receiving portion for accommodating the battery cell, and the receiving portion is arranged in an L-shape; The clamping mechanism is disposed opposite to the opening side of the receiving part and is used to press the battery cell into the receiving part. The receiving part is provided with a material picking groove on the side facing the battery cell. The third drive assembly presses against the cell via another opening side of the housing.

3. The welding apparatus according to claim 1, characterized in that, The first driving assembly includes a first cylinder and a first guide portion. The pressing assembly is slidably connected to the first guide portion, and the first cylinder is used to drive the pressing assembly to move along the first guide portion.

4. The welding apparatus according to claim 2, characterized in that, The clamping assembly includes a bracket and a pressing part. The pressing part is located on the side of the bracket facing the receiving part. The welding mechanism is located on the top of the bracket and corresponds to the welding position when the clamping assembly presses against the battery cell.

5. The welding apparatus according to claim 1, characterized in that, The second drive assembly includes a second cylinder and a second guide portion. The support assembly is slidably connected to the second guide portion, and the second cylinder is used to drive the support assembly to move along the second guide portion.

6. The welding apparatus according to claim 1, characterized in that, The support assembly includes a lifting drive component and a support section; The support portion is located at the output end of the lifting drive member, which is used to drive the support portion to rise and fall. The support portion is configured to contact and drive the two positive electrode tabs to move closer to each other during the process of descending from the first position to the second position.

7. The welding apparatus according to claim 6, characterized in that, The support portion is provided with a positioning portion for positioning the connecting piece and an adsorption portion for adsorbing or releasing the connecting piece.

8. The welding apparatus according to claim 1, characterized in that, The bending mechanism includes a first bending section and a second bending section; The first bending portion is disposed on the clamping mechanism and moves synchronously with the pressing assembly, bending one side of the positive electrode tab during the movement; The second bending portion is movably mounted on the positioning mechanism. The second bending portion can approach the positive electrode tab on the other side to bend the positive electrode tab on the other side.

9. The welding apparatus according to claim 8, characterized in that, The bending mechanism further includes a third cylinder, the fixed end of which is connected to the positioning mechanism, and the second bending part is located at the output end of the third cylinder. The third cylinder is used to drive the second bending part to move.

10. The welding apparatus according to claim 1, characterized in that, The welding apparatus also includes a laser welding galvanometer mechanism and a control mechanism; The laser welding galvanometer mechanism is located at the top of the welding position. The output of the control mechanism is connected to at least the input of the laser welding galvanometer mechanism, the first drive component, the second drive component, and the third drive component.

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