Welding device for sodium ion battery processing

Abstract

The invention discloses a welding device for sodium ion battery processing, and relates to the technical field of sodium ion battery welding, the welding device comprises a processing platform on which a battery shell conveying belt and a battery cap conveying cylinder are mounted; the battery case conveying belt is used for conveying the battery case and moves towards the direction of the battery cap conveying cylinder; a plurality of layers of supporting pieces are installed on the inner wall of the battery cover cap conveying cylinder, the supporting pieces bear the battery cover caps, the guide plates of the supporting pieces of each layer clamp the battery cover caps, the bearing plates are used for supporting the battery cover caps, and a battery cover cap containing chamber is formed between every two adjacent bearing plates; by means of the design, one-way, step-by-step and orderly feeding of the battery caps is achieved, the problem that small parts are prone to being clamped and retreated in the conveying process is solved, and stability and accuracy of the machining process are guaranteed from the source. According to the process, firstly, a gap between the tab and the cap is eliminated through physical pressing, and pseudo soldering is prevented; and through welding of two positions, the welding area and strength are remarkably increased, and the connection reliability is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sodium-ion battery welding, in particular to a welding device for sodium-ion battery processing. BACKGROUND

[0002] Sodium-ion batteries are a kind of secondary batteries, which mainly rely on sodium ions to move between the positive and negative electrodes to work, similar to the working principle of lithium batteries. During the assembly of the battery, in order to ensure the stability of the combination between the battery cap and the battery cell, a welding mechanism is generally used to firmly attach the battery cap to the top of the battery body.

[0003] The defects of the existing battery welding mechanism are: The existing technology may cause material jamming during cap feeding: the parts may be stuck in the track, causing the production line to stop, the welding process is single, there is a risk of false welding, the strength of the welding point is insufficient, and the laser is directly irradiated on the tab and cap which may not be tightly attached. Due to the curl or curvature of the tab itself, there is a gap between the tab and the cap, which easily leads to false welding. Only one welding is performed, the welding point area is small, and the connection strength is limited, which may crack during subsequent use of the battery such as vibration and expansion. False welding is a serious quality hazard, which may cause the battery resistance to increase, heat and even open circuit. The mechanical strength of single-point welding is insufficient, which may fail in harsh working conditions, affecting the service life and safety of the entire battery pack. SUMMARY

[0004] The purpose of the present application is to provide a welding device for sodium-ion battery processing, which has one-way, step-by-step and orderly feeding of battery caps, solves the problem of small parts being easily stuck and returned during transportation, and ensures the stability and accuracy of the processing process from the source. This process first eliminates the gap between the tab and the cap by physical compression to prevent false welding. Through welding at two positions, the welding area and strength are significantly increased, greatly improving the reliability of the connection.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a welding device for sodium-ion battery processing, comprising: a processing platform, on which a battery shell conveying belt and a battery cap conveying cylinder are installed; the battery shell conveying belt is used to convey the battery shell and move towards the direction of the battery cap conveying cylinder; The battery cap conveying cylinder is provided with a plurality of layers of support members mounted on the inner wall of the battery cap conveying cylinder, each layer of support members supports a battery cap, each layer of support members comprises a plurality of horizontally arranged support plates, baffle plates, guide plates and supporting plates, one end of the support plate is fixed to the inner wall of the battery cap conveying cylinder, the baffle plate is mounted on the support plate, the side surface of the baffle plate is connected to the supporting plate through a spring, the top surface of the supporting plate is fixed with the guide plate, the guide plate of each layer of support members clamps the battery cap, and the supporting plate is used for supporting the battery cap, and the battery cap accommodating chamber is formed between adjacent supporting plates. The laser welding head is provided with a pressing head, the battery shell is moved above the battery cap, the pressing head is lowered to push the tab in the battery shell to contact the battery cap, and then the laser welding head is used for welding the tab and the battery cap.

[0006] As an optional embodiment, the machining platform is provided with a cap hole through which the battery cap passes and a notch, the notch is communicated with the cap hole and is used for accommodating the support member.

[0007] As an optional embodiment, the battery cap is driven to rise by a jacking member, the jacking member comprises a driving shaft, a cam and a conveying groove, the battery cap is sent to the position directly below the battery cap conveying cylinder by the conveying groove, and a strip-shaped groove is formed in the conveying groove. The cam is fixed on the driving shaft, the cam can rotate to pass through the strip-shaped groove, the battery cap is jacked to contact the supporting plate, and the supporting plate is pushed to move towards the baffle plate, so that the battery cap is moved into the battery cap accommodating chamber.

[0008] As an optional embodiment, the laser welding head is driven to reciprocate by a crankshaft structure, the crankshaft structure comprises a driven shaft, a crankshaft, a connecting rod one and a connecting rod two, the driven shaft is assembled on the machining platform, the driven shaft is connected to the crankshaft, the crankshaft is connected to the laser welding head through the articulated connecting rod one and the connecting rod two, and the connecting rod one is limited by a guide seat on the machining platform.

[0009] As an optional embodiment, the battery shell conveying belt is provided with a conveying member for intermittently conveying the battery shell, the conveying member comprises an upper shaft, a lower shaft, a toothed disc, an upper chuck and a lower chuck, the toothed disc is fixed on the upper shaft and the lower shaft, the two toothed discs are engaged, the upper chuck and the lower chuck are fixed on the upper shaft and the lower shaft respectively, four circular grooves are formed in the upper chuck and the lower chuck, and the circular grooves between the upper chuck and the lower chuck are used for clamping the battery shell.

[0010] As an optional embodiment, the conveying member further comprises a limiting structure, the limiting structure comprises a push plate, a locking block and a locking disc, the locking block is fixed on the push plate through a spring, the locking disc is arranged on the upper shaft and the lower shaft, and a plurality of locking grooves for accommodating the locking block are formed in the edge of the locking disc.

[0011] As an optional implementation, a belt is sleeved on the driven shaft, and a partition plate arranged on the processing platform is used to separate the belt and the laser welding head.

[0012] As an optional implementation, an incomplete gear is mounted on the driving shaft, the incomplete gear is engaged with the toothed disc of the lower shaft, and the driving shaft is driven to rotate by the motor in the processing platform.

[0013] As an optional implementation, the pressing head is rotatable around the laser welding head, and the pressing head comprises a rotating frame and a pressing plate, one end of the rotating frame is movably connected with the laser welding head, and the other end of the rotating frame is fixed with the pressing plate.

[0014] As an optional implementation, a strip-shaped through hole is further formed in the pressing plate, and the laser welding head welds the tab and the battery cover cap through the strip-shaped through hole.

[0015] Technical effects and advantages of the present application: The internal multi-layer support constitutes a one-way structure, when the battery cover cap is jacked up from the bottom, the inclined supporting plate is pushed away and moves upward; after that, the supporting plate is immediately reset under the action of the spring and supports the cover cap to prevent it from falling back. This design realizes the one-way, step-by-step and orderly feeding of the battery cover cap, solves the problem of easy jamming and backtracking of small parts during conveying, and ensures the stability and accuracy of the processing process from the source.

[0016] This process first eliminates the gap between the tab and the cover cap by physical compression to prevent false welding; then through welding in two positions, the welding area and strength are significantly increased, and the connection reliability is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall axonometric view of the present application; Figure 2 is the left side structure view of the conveying member, the jacking member and the laser welding head of the present application; Figure 3 is the right side structure view of the conveying member, the jacking member and the laser welding head of the present application; Figure 4 is the limiting structure structure view of the present application; Figure 5 is the internal structure view of the battery cover cap conveying cylinder of the present application; Figure 6 is the Figure 5 is the enlarged view of A of the present application.

[0018] In the drawings: 1, processing platform; 2, battery shell conveying belt; 21, battery shell; 3, battery cap conveying cylinder; 31, support plate; 32, baffle; 33, guide plate; 34, supporting plate; 4, laser welding head; 41, pressure head; 411, rotating frame; 412, pressing plate; 5, jacking piece; 51, driving shaft; 511, incomplete gear; 52, cam; 53, conveying groove; 531, strip-shaped groove; 6, crankshaft structure; 61, driven shaft; 62, crankshaft; 63, connecting rod one; 64, connecting rod two; 7, conveying piece; 71, upper shaft; 72, lower shaft; 73, toothed disc; 74, upper chuck; 75, lower chuck; 76, limiting structure; 761, push plate; 762, lock block; 763, lock disc. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0020] Before the embodiments of the present application are described, the basic concepts and terms involved in the embodiments of the present application are explained first to facilitate understanding of the technical solutions of the present application. Referring to Figures 1-6 A welding device for processing sodium ion batteries comprises: A processing platform 1, on which a battery shell conveying belt 2 and a battery cap conveying cylinder 3 are installed; The battery shell conveying belt 2 is installed above the processing platform 1, and the battery cap conveying cylinder 3 is arranged below the processing platform 1.

[0021] The battery shell conveying belt 2 is used to convey battery shells 21 and move towards the direction of the battery cap conveying cylinder 3. The battery shell conveying belt 2 is composed of an upper plate and a lower plate, and a moving channel for the battery shells 21 is formed between the upper plate and the lower plate. A push plate between the upper plate and the lower plate pushes the battery shells 21 to move; The battery cap conveying cylinder 3 has multiple layers of support pieces installed on its inner wall. Each layer of support pieces supports battery caps. Each layer of support pieces comprises a plurality of horizontally arranged support plates 31, baffles 32, guide plates 33 and supporting plates 34. One end of each support plate 31 is fixed to the inner wall of the battery cap conveying cylinder 3. Each baffle 32 is installed on a support plate 31. The side surface of each baffle 32 is connected to a supporting plate 34 through a spring. Each guide plate 33 is fixed to the top surface of a supporting plate 34. Each guide plate 33 of each layer of support pieces clamps a battery cap. Each supporting plate 34 supports a battery cap. The battery cap accommodating chambers are formed between adjacent supporting plates 34. The lower end of the supporting plate 34 is beveled to contact the battery cover cap, and the sliding block at the bottom of the supporting plate 34 is clamped in the sliding groove of the supporting plate 31 to limit the sliding direction of the supporting plate 34.

[0022] The battery cover cap conveying cylinder 3 and the supporting piece are arranged to sequentially lift the battery cover cap upwards, and the lifted battery cover cap is prevented from moving downwards, thereby achieving the one-way movement of the battery cover cap, which will be described below. When the battery cover cap moves upwards, the top of the battery cover cap contacts the bevel of the supporting plate 34, and as the battery cover cap continuously moves upwards, the sliding block of the supporting plate 34 is pushed to move along the sliding groove towards the baffle 32. As the battery cover cap continues to move upwards, the battery cover cap is disengaged from the supporting plate 34, and at this time the supporting plate 34 is reset under the action of the spring. The supporting plate 34 moves towards the upper position to support the battery cover cap, and the side guide plate 33 is used to abut against the battery cover cap to limit the position of the battery cover cap. The above structure realizes the automatic feeding of the battery cover cap.

[0023] The laser welding head 4 is provided with a pressing head 41, the battery shell 21 is moved to the upper side of the battery cover cap, the pressing head 41 is lowered to push the tab in the battery shell 21 to contact the battery cover cap, and then the laser welding head 4 is used to weld the tab and the battery cover cap. The pressing head 41 can rotate around the laser welding head 4, and the pressing head 41 comprises a rotating frame 411 and a pressing plate 412. One end of the rotating frame 411 is movably connected with the laser welding head 4, and the other end of the rotating frame 411 is fixed with the pressing plate 412. A strip-shaped through hole is further formed in the pressing plate 412, and the laser welding head 4 passes through the strip-shaped through hole to weld the tab and the battery cover cap.

[0024] Specifically, when welding the tab and the battery cover cap, the pressing plate 412 is first rotated to the lower side of the laser welding head 4, and then the pressing plate 412 and the laser welding head 4 are lowered synchronously. The pressing plate 412 first contacts the tab in the battery shell, and as the pressing plate 412 continues to descend, the tab is slowly lowered to contact the top surface of the battery cover cap. At this time, the laser of the laser welding head 4 passes through the strip-shaped through hole to weld the tab and the battery cover cap. At this time, the tab and the battery cover cap are preliminarily welded to be in a connected state. Then, the rotating frame 411 drives the pressing plate 412 to rotate away, and the laser welding head 4 performs secondary welding on the tab and the battery cover cap. Without the shielding of the pressing plate 412, the tab and the battery cover cap can be welded at another position, and through twice welding, the welding is more firm.

[0025] The pressing plate 412 is used to press the tab to facilitate subsequent welding, which simplifies the operation and increases the welding position and the firmness of the welding.

[0026] The machining platform 1 is provided with a cap hole for the battery cap to pass through and a gap, and the gap is communicated with the cap hole and used for accommodating the supporting member.

[0027] The battery cap is driven to rise by the jacking member 5, the jacking member 5 comprises a driving shaft 51, a cam 52 and a conveying groove 53, the battery cap is sent to the position right below the battery cap conveying cylinder 3 by the conveying groove 53, and a strip-shaped groove 531 is formed on the conveying groove 53. The cam 52 is fixed on the driving shaft 51, the cam 52 can pass through the strip-shaped groove 531 by rotating, and is used for jacking up the battery cap to contact with the supporting plate 34 and pushing the supporting plate 34 to move towards the baffle 32, so as to move the battery cap into the battery cap accommodating chamber.

[0028] The battery cap is conveyed to the battery cap conveying cylinder 3 one by one by the conveying groove 53, when the battery cap moves to the position below the battery cap conveying cylinder 3, the jacking action of the battery cap is realized by the jacking member 5, the rotating angle of the driving shaft 51 is same as that of the cam 52, when the cam 52 rotates 180 degrees, the longer end of the cam 52 passes through the strip-shaped groove 531 to jack up the battery cap, the battery cap is sent to the battery cap accommodating chamber above, then the cam 52 rotates 180 degrees, the longer end of the cam 52 is separated from the strip-shaped groove 531, and the shorter end of the cam 52 does not exceed the strip-shaped groove 531.

[0029] The laser welding heads 4 are all driven to reciprocate by the crank structure 6, the crank structure 6 comprises a driven shaft 61, a crank 62, a connecting rod one 63 and a connecting rod two 64, the driven shaft 61 is assembled on the machining platform 1, the driven shaft 61 is connected with the crank 62, the crank 62 is connected with the laser welding heads 4 through the hinged connecting rod one 63 and the connecting rod two 64, and the connecting rod one 63 is limited by the guide seat on the machining platform 1.

[0030] The crank structure 6 is used as a transmission structure for driving the laser welding heads 4 to reciprocate up and down.

[0031] The conveying member 7 for intermittently conveying the battery shell 21 is assembled on the battery shell conveying belt 2, the conveying member 7 comprises an upper shaft 71, a lower shaft 72, a toothed disc 73, an upper chuck 74 and a lower chuck 75, the toothed disc 73 is fixed on the upper shaft 71 and the lower shaft 72, and the two toothed discs 73 are engaged, the upper chuck 74 and the lower chuck 75 are respectively fixed on the upper shaft 71 and the lower shaft 72, four circular grooves are formed on the upper chuck 74 and the lower chuck 75, and the circular grooves between the upper chuck 74 and the lower chuck 75 are used for clamping the battery shell 21.

[0032] The upper chuck 74 and the lower chuck 75 rotate once to drive the battery shell 21 to move, and the next battery shell 21 is clamped at the same time.

[0033] The conveying member 7 further comprises a limiting structure 76, which comprises a push plate 761, a locking block 762 fixed on the push plate 761 by a spring, and a locking disc 763 arranged on the upper shaft 71 and the lower shaft 72, and a plurality of locking grooves for accommodating the locking block 762 are formed on the edge of the locking disc 763. A belt is sleeved on the driven shaft 61, and a partition plate arranged on the machining platform 1 is used to separate the belt and the laser welding head 4.

[0034] The limiting structure 76 is used to lock the upper chuck 74 and the lower chuck 75. During the rotation of the locking disc 763 in one direction, the locking disc 763 pushes the locking block 762 and the push plate 761 to compress the spring, until the locking groove is rotated to the position corresponding to the locking block 762, at which time the circular groove between the upper chuck 74 and the lower chuck 75 is closed and clamps the battery shell 2, and the locking block 762 is inserted into the locking groove, at which time the locking effect is achieved. After welding, the rotation of the upper chuck 74 and the lower chuck 75 pushes the locking block 762 and the push plate 761 to compress the spring again, and then the locking block 762 is separated from the locking groove.

[0035] The driving shaft 51 is provided with an incomplete gear 511, which is engaged with the tooth disc 73 of the lower shaft 72. The driving shaft 51 is connected with the driven shaft 61 through a belt, and is driven to rotate by the motor in the machining platform 1.

[0036] In order to prevent the battery shell 21 from moving during welding, and to prevent the battery cap from being affected by the upward and downward movement of the laser welding head 4, the conveying member 7, the limiting structure 76 and the incomplete gear 511 are provided.

[0037] Specifically, the motor drives the driving shaft 51 to rotate, so as to drive the cap lifting structure, the welding structure and the battery conveying structure to move synchronously, which will be described in detail below. When the driving shaft 51 rotates by 90 degrees, the incomplete gear 511 rotates, and the circular groove between the upper chuck 74 and the lower chuck 75 is closed to push the battery shell 21 to move to the welding position. During the rotation of the driving shaft 51, the longer end of the cam 52 slowly lifts the battery cap and pushes the battery cap out of the machining platform 1, and the laser welding head 4 descends by one-half stroke. The incomplete gear 511 is then separated from the tooth disc 73 of the lower chuck 75. The rotation of the incomplete gear 511 will not drive the upper chuck 74 and the lower chuck 75 to rotate, and the position of the battery shell will not move.

[0038] The driving shaft 51 continues to rotate by 90 degrees, and the longer end of the cam 52 slowly descends to the horizontal position. The laser welding head 4 continues to descend to the bottom end. During the descending process, the pressing plate 412 first contacts the tab in the battery shell. As the pressing plate 412 continues to descend, the tab slowly and completely contacts the top surface of the battery cap. At this time, the laser of the laser welding head 4 passes through the strip-shaped through hole to weld the tab and the battery cap, and the welding is completed.

[0039] The driving shaft 51 continues to rotate 90 degrees, the cam 52 rotates the shorter end at the uppermost end, and the longer end at the lowermost end, and the laser welding head 4 rises by one-half of the stroke.

[0040] The driving shaft 51 continues to rotate 90 degrees, the longer end of the cam 52 is in a horizontal position, the incomplete gear 511 is in contact with the toothed disc 73 of the lower chuck 75, and the laser welding head 4 rises to the highest position.

[0041] The automatic feeding and accurate positioning of the battery shell 21 and the battery cap are achieved, and a clever compression and twice welding process is used to ensure firm and reliable welding. The entire device is synchronously controlled by a set of driving systems, i.e., the driving shaft 51 drives, and the conveying member 7 and the welding head are controlled by the incomplete gear 511 and the belt respectively to realize accurate timing cooperation. High automation and synchronization: The feeding, lifting, and welding three core actions are cleverly driven by a driving shaft 51, the timing is accurate, and the efficiency is high. Reliable cap feeding: The design of the battery cap conveying cylinder 3 uses a slope and a spring to realize one-way valve type feeding, which is simple and reliable, and can effectively prevent the cap from falling back. Firm welding process: A unique process of "compression, preliminary welding, loosening, and twice welding" is used. The compression plate 412 ensures the close contact of the tab and the cap, and eliminates the possibility of false welding; twice welding significantly increases the strength and reliability of the welding point. Accurate positioning and locking: The limiting structure of the conveying member 7 ensures that the battery shell is absolutely stationary during welding, which is the key to realizing high-quality laser welding.

[0042] Finally, it should be noted that the above-described only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A welding device for sodium-ion battery processing, characterized by, The utility model relates to a battery cover cap conveying device, which comprises a processing platform (1) on which a battery shell conveying belt (2) and a battery cover cap conveying cylinder (3) are installed; the battery shell conveying belt (2) is used for conveying a battery shell (21) and moving towards the direction of the battery cover cap conveying cylinder (3); the battery cover cap conveying cylinder (3) is internally provided with a plurality of layers of support members, each layer of support member supports a battery cover cap, and each layer of support member comprises a plurality of horizontally arranged support plates (31), baffle plates (32), guide plates (33) and supporting plates (34); one end of the support plate (31) is fixed to the inner wall of the battery cover cap conveying cylinder (3); the baffle plate (32) is installed on the support plate (31); the side surface of the baffle plate (32) is connected to the supporting plate (34) through a spring; the top surface of the supporting plate (34) is fixed with the guide plate (33); the guide plate (33) of each layer of support member clamps the battery cover cap, and the supporting plate (34) is used for supporting the battery cover cap; and the battery cover cap accommodating chamber is formed between adjacent supporting plates (34). The laser welding head (4) is provided with a pressing head (41); when the battery shell (21) moves to the upper side of the battery cover cap, the pressing head (41) is lowered to push the tab in the battery shell (21) to contact the battery cover cap, and then the laser welding head (4) is used for welding the tab and the battery cover cap. The processing platform (1) is provided with a cover cap hole through which the battery cover cap passes and a notch which is communicated with the cover cap hole and is used for accommodating the support member. The battery cover cap is driven to ascend by a jacking member (5) which comprises a driving shaft (51), a cam (52) and a conveying groove (53); the battery cover cap is sent to the position directly below the battery cover cap conveying cylinder (3) by the conveying groove (53); and a strip-shaped groove (531) is formed in the conveying groove (53). The driving shaft (51) is fixed with the cam (52); the cam (52) can rotate to pass through the strip-shaped groove (531) and is used for jacking up the battery cover cap to contact the supporting plate (34) and pushing the supporting plate (34) to move towards the baffle plate (32) so as to move the battery cover cap into the battery cover cap accommodating chamber.

2. The welding device for processing of a sodium-ion battery according to claim 1, characterized in that, The laser welding head (4) is driven to reciprocate by a crankshaft structure (6) which comprises a driven shaft (61), a crankshaft (62), a connecting rod one (63) and a connecting rod two (64); the driven shaft (61) is assembled on the processing platform (1); the driven shaft (61) is connected to the crankshaft (62); the crankshaft (62) is connected to the laser welding head (4) through the hinged connecting rod one (63) and the connecting rod two (64); and the connecting rod one (63) is limited by a guide seat on the processing platform (1).

3. The welding device for processing of a sodium-ion battery according to claim 2, characterized in that ​ ​ 4. The welding device for processing of a sodium-ion battery according to claim 3, characterized in that ​ 5. The welding device for processing of a sodium-ion battery according to claim 4, characterized in that The battery shell conveying belt (2) is provided with conveying pieces (7) for intermittently conveying battery shells (21), the conveying piece (7) comprises an upper shaft (71), a lower shaft (72), a toothed disc (73), an upper chuck (74) and a lower chuck (75), the toothed disc (73) is fixed on the upper shaft (71) and the lower shaft (72), the two toothed discs (73) are engaged, the upper chuck (74) and the lower chuck (75) are fixed on the upper shaft (71) and the lower shaft (72) respectively, four circular grooves are formed in the upper chuck (74) and the lower chuck (75), and the circular grooves between the upper chuck (74) and the lower chuck (75) are used for clamping the battery shell (21).

6. The welding device for processing of a sodium-ion battery according to claim 5, characterized in that The conveying piece (7) further comprises a limiting structure (76), the limiting structure (76) comprises a push plate (761), a locking block (762) and a locking disc (763), the locking block (762) is fixed on the push plate (761) through a spring, the locking disc (763) is arranged on the upper shaft (71) and the lower shaft (72), and a plurality of locking grooves for accommodating the locking block (762) are formed in the edge of the locking disc (763).

7. The welding device for processing of a sodium-ion battery according to claim 6, characterized in that The driven shaft (61) is sleeved with a belt, and the partition plate arranged on the machining platform (1) is used for separating the belt and the laser welding head (4).

8. The welding device for processing of a sodium-ion battery according to claim 7, characterized in that The driving shaft (51) is provided with an incomplete gear (511), the incomplete gear (511) is engaged with the toothed disc (73) of the lower shaft (72), and the driving shaft (51) is driven to rotate by the motor in the machining platform (1).

9. The welding device for processing of a sodium-ion battery according to claim 8, characterized in that The pressure head (41) can rotate around the laser welding head (4), and the pressure head (41) comprises a rotating frame (411) and a pressure plate (412), one end of the rotating frame (411) is movably connected with the laser welding head (4), and the other end of the rotating frame (411) is fixed with the pressure plate (412).

10. The welding device for processing of a sodium-ion battery according to claim 8, characterized in that Strip-shaped through holes are further formed in the pressure plate (412), and the laser welding head (4) welds the tab and the battery cover through the strip-shaped through holes.

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