A method for butt welding of a battery

Abstract

The present invention belongs to the technical field of battery tooling, and in particular to a method for butt welding of batteries. In view of the problem that the traditional welding method and sequence lead to poor welding in C-position welding, the following scheme is proposed, including placing the battery box with holes punched in the loading position of the through-wall welding equipment, and then embedding the cast-welded battery cells into the corresponding holes inside the battery box; adjusting the through-wall welding equipment and fixing the unwelded assembled large battery mold base in the corresponding positioning slot of the turntable, and slowly rotating it to the welding position; and then starting the through-wall welding equipment. The present invention can weld the two battery cells close to each other at the same end of the battery box at the beginning of spot welding, and then weld other points, which can effectively prevent the influence of the welding tension generated in the length direction on the number three butt welding point, that is, forming a force-releasing butt welding, reducing the resistance between the metal electrode and the butt welding point.

Description

Technical Field

[0001] The present invention relates to the technical field of battery tooling, and in particular to a battery butt welding method. Background Art

[0002] The lead-acid battery manufacturing industry has developed over the years, with rapid advancements in production automation, largely replacing traditional manual labor. Large factories now have mature and controllable processes for cast welding, through-wall welding, and heat sealing. However, through-wall welding of large batteries has a high failure rate. Battery through-wall butt welding machines are used for welding batteries, primarily for efficient and precise welding of battery electrodes to other metal components (such as battery connectors and battery terminals). Due to the high technical requirements for battery welding, multiple aspects must be carefully considered during operation to ensure welding quality and avoid damaging the battery or causing safety issues.

[0003] A search revealed that conventional manufacturers use a two-station process for small batteries, welding points 1, 3, and 5 first, followed by points 2 and 4. For large batteries, they use a three-station process, welding points 1 and 2 first, then points 5 and 4, and finally point 3. This is conventionally called C-position welding. A common anomaly in the lead-acid battery market is a "broken C-position," whereby tensile stress is generated at point 3 during welding, ultimately leading to a poor weld. Summary of the Invention

[0004] To address the technical problem that conventional welding methods and sequences easily lead to poor welding in C-position welding, the present invention adopts the following technical solutions:

[0005] A battery butt welding method comprises the following steps:

[0006] S1: Place the battery box with holes punched in the loading position of the through-wall welding equipment, and then embed the cast-welded battery cells into the corresponding holes inside the battery box;

[0007] S2: Adjust the through-wall welding equipment and fix the assembled large battery mold base that has not been welded into the corresponding positioning slot of the turntable, and slowly rotate it to the welding position;

[0008] S3: Then start the through-wall welding equipment and perform spot welding in the order of No. 3 welding point, No. 4 welding point, No. 5 welding point, No. 2 welding point, and No. 1 welding point; finally, perform the normal inspection method for quality inspection.

[0009] A through-wall welding device includes a fixed machine platform, the fixed machine platform includes a base, the base is a U-shaped structure as a whole, and a vertical back upright plate is fixed to the end of the upper surface of the base away from the opening, and a top support plate extending horizontally toward the middle of the opening of the base is fixed to the top of the back upright plate, two mutually symmetrical tapered roller bearings are embedded in the middle of the top support plate, and the same transmission tube is rotatably connected between the two tapered roller bearings, a turntable is fixed to the top of the transmission tube, and a plurality of positioning slots symmetrically distributed near the circumferential edge of the turntable are opened, and the internal dimensions of the positioning slots are adapted to the outer dimensions of the battery box; the upper surface of the top support plate is located at A CNC moving platform is provided above the back plate, and the top of the CNC moving platform is provided with vertical double rails with slots facing the turntable; the side of the vertical double rails is slidably connected with an L-shaped fixed arm beam, and the horizontal beam end of the L-shaped fixed arm beam is provided with a rotating hole, and a rotating mechanism is provided in the rotating hole, and the rotating mechanism includes an anti-slip bearing clamped in the rotating hole, and a vertical anti-rotation rod is rotatably connected in the anti-slip bearing; a through-wall butt welding machine is fixed to the bottom end of the anti-rotation rod; an embedding groove is provided on the vertical plate surface of the L-shaped fixed arm beam, and an electric control positioning pin is fixed to the bottom of the embedding groove, and a roller frame is fixed to the output shaft end of the electric control positioning pin, and a tightening roller is clamped at the bottom of the roller frame.

[0010] Preferably, the rotating mechanism also includes a pull rope wrapped around the anti-rotation rod near the top position; and two symmetrical through-baffles are fixed to the circumferential outer wall of the anti-rotation rod, and the plane on the same side of the two through-baffles is the through-plane, that is, the through-plane passes through the axial center line of the anti-rotation rod, and two limit baffles with a plate surface angle of ninety degrees are fixed on the upper surface of the L-shaped fixed arm beam near the anti-rotation rod; and pressure sensors are embedded on the planes of the two limit baffles; reset springs are fixed at both ends of the pull rope.

[0011] Preferably, an L-shaped bearing holder is fixed to the end of the upper surface of the L-shaped fixed arm beam away from the anti-slip bearing, and the top of the L-shaped bearing holder is rotatably connected to a short shaft rod, and the upper and lower ends of the short shaft rod are respectively fixed with an anti-slip wheel and a worm gear 1; the outer wall of the anti-slip wheel is wrapped with a rotary pull belt, and the two ends of the rotary pull belt are respectively fixed to the ends of two reset springs; a servo motor is fixed to the side of the L-shaped fixed arm beam near the top, and a worm that meshes with the worm gear 1 is fixed to the top of the output shaft of the servo motor; when it is necessary to control the through-wall butt welding machine to rotate ninety degrees, it is only necessary to start the servo motor, and with the setting of the reset spring, it can be pulled a certain distance more, so that the reset spring always generates a pre-tightening tension on the pull rope, ensuring that the through-wall butt welding machine always remains stable.

[0012] Preferably, a counterweight extension rod extending in the opposite direction is fixed to the top end of the L-shaped fixed arm beam away from the anti-rotation rod, and a strip hole is opened at the end of the counterweight extension rod away from the L-shaped fixed arm beam, and a counterweight block is slidably connected to the strip hole; this can reduce the friction resistance of the vertical double rails and ensure that the weight on both sides remains balanced.

[0013] Preferably, roller grooves are provided on the inner walls on both sides in the length direction of the positioning slot, and side rollers are embedded in the roller grooves; the side surfaces of the top support plate are fixed with lifting trapezoidal slats; and the highest point of the lifting trapezoidal slats is lower than the plane where the lower surface of the turntable is located; after welding, when the large battery module is rotated to the lifting trapezoidal slats, it can be slowly lifted up, and at this time, the edges of the large battery module can be conveniently grabbed.

[0014] Preferably, a bearing slot is provided in the middle of the top supporting plate; the bearing slot is used to clamp two mutually symmetrical tapered roller bearings.

[0015] Preferably, the lower surface of the base is provided with an upwardly concave arched surface. By such an arrangement, the contact surface between the base and the ground can be triangular, thereby improving the stability of the device.

[0016] Preferably, a horizontally arranged reduction motor is fixed to the lower surface of the top support plate, and a worm sleeve is fixed to the top end of the output shaft of the reduction motor, and the outer wall of the transmission tube is sleeved with a driven worm gear that meshes with the worm sleeve; this can improve the accuracy of the stopping angle of the driven worm gear and the reverse self-locking effect.

[0017] Preferably, the circumferential outer wall of the transmission tube is provided with a plurality of side sections symmetrically distributed near the bottom end, and electrical contact pieces connected in series to the alarm circuit are embedded on both sides of the side sections. A contact plate is fixed to the upper surface of the base near the transmission tube, and a telescopic support rod is fixed to the top of the contact plate, and a metal flat plate is fixed to the end of the extension rod of the telescopic support rod, and the position of the side section corresponds to the position of the positioning slot.

[0018] The beneficial effects of the present invention are:

[0019] 1. By setting up a turntable and a through-wall butt welding machine with a rotating mechanism, the two battery cells close to each other at the same end of the battery box can be welded first at the beginning of spot welding, and then welding of other points can be carried out. This can effectively prevent the influence of the welding tension generated in the length direction on the No. 3 butt welding point, that is, forming a force-releasing butt welding, reducing the resistance between the metal electrode and the butt welding point.

[0020] 2. Through the set pull rope and two through-hole baffles, when you need to control the through-wall welding machine to rotate 90 degrees for welding, you only need to pull one of the reset springs until the through-hole baffle touches the other pressure sensor.

[0021] 3. Through the two electrical contact pieces set on the side section and the metal plate at the end of the telescopic rod, when in use, the two electrical contact pieces can be touched at the same time only when the side section is rotated to be parallel to the metal plate. At this time, the alarm circuit can be triggered and the reduction motor can be controlled to stop rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a through-wall welding device proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the through-wall welding equipment proposed by the present invention when viewed from the other side;

[0024] Figure 3 This is a schematic diagram of the overall structure of a fixed platform in a through-wall welding device proposed by the present invention;

[0025] Figure 4 A side view of a through-wall welding device proposed by the present invention;

[0026] Figure 5 A top view of a through-wall welding device proposed by the present invention;

[0027] Figure 6 A schematic diagram of the three-dimensional structure of a rotary mechanism (8) in a through-wall welding device proposed by the present invention;

[0028] Figure 7 This is a schematic diagram of the assembly structure of a large battery module in a through-wall welding device proposed by the present invention;

[0029] Figure 8 This is a schematic diagram of the overall structure of a large battery module in a through-wall welding device proposed by the present invention.

[0030] Figure: 1. Base; 2. Driven worm gear; 3. Positioning slot; 4. Side roller; 5. Turntable; 6. Large battery module; 601. Battery box; 602. Cross-shaped partition; 603. Battery cell; 604. Metal pole piece; 605. Butt welding point No. 3; 606. Butt welding point No. 4; 607. Butt welding point No. 5; 608. Butt welding point No. 2; 609. Butt welding point No. 1; 7. Through-wall butt welding machine; 8. Rotating mechanism; 801. Servo motor; 802. L-shaped bearing holder; 803. Rotating pull belt; 804. Anti- Rotating rod; 805, through-hole baffle; 806, anti-slip wheel; 807, worm gear 1; 808, limit baffle; 809, pull rope; 810, reset spring; 9, L-shaped fixed arm beam; 10, vertical double rails; 11, CNC moving table; 12, top support plate; 121, bearing slot; 13, reduction motor; 14, lifting trapezoidal slats; 15, worm sleeve; 16, transmission tube; 161, side section; 17, contact plate; 18, counterweight extension rod; 19, electric control positioning pin; 20, roller frame; 21, anti-slip bearing. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1-8 A method for butt welding a battery comprises the following steps:

[0033] S1: Place the battery box 601 with holes punched in it at the loading position of the through-wall welding equipment, and then insert the cast-welded battery cells 603 into the corresponding holes inside the battery box 601. That is, first drill holes at the top metal electrode 604 of the battery cell 603 corresponding to the cross-shaped partition 602 inside it;

[0034] S2: Adjust the through-wall welding equipment and fix the assembled large battery mold base 6 that has not been welded into the corresponding positioning slot 3 of the turntable 5, and slowly rotate it to the welding position;

[0035] S3: Then start the through-wall welding equipment and perform spot welding in the order of No. 3 butt welding point 605, No. 4 butt welding point 606, No. 5 butt welding point 607, No. 2 butt welding point 608, and No. 1 butt welding point 609; finally, perform a normal inspection method for quality inspection.

[0036] Please refer to Figure 1-8, a through-wall welding equipment, including a fixed machine platform, the fixed machine platform includes a base 1, the base 1 is a U-shaped structure as a whole, and a vertical back plate is fixed on the upper surface of the base 1 at one end away from the opening, and a top support plate 12 is fixed on the top of the back plate, which extends horizontally toward the middle of the opening of the base 1, and two symmetrical tapered roller bearings are embedded in the middle of the top support plate 12, and the two tapered roller bearings are rotatably connected with the same vertical transmission tube 16, and a turntable 5 is fixed on the top of the transmission tube 16, and a plurality of positioning slots 3 are centrally symmetrically distributed near the circumferential edge of the turntable 5, and the internal dimensions of the positioning slots 3 are adapted to the outer dimensions of the battery box 601; a CNC moving platform 11 is provided on the upper surface of the top support plate 12 above the back plate, and the CNC moving platform 11 can complete the horizontal X-axis and Y-axis movement according to instructions, and the top of the CNC moving platform 11 is provided with a vertical double rail 10 with a notch facing the turntable 5; the side of the vertical double rail 10 is slidably connected with an L The L-shaped fixed arm beam 9 is provided with a rotating hole at the end of the horizontal beam of the L-shaped fixed arm beam 9, and a rotating mechanism 8 is provided in the rotating hole. The rotating mechanism 8 includes an anti-slip bearing 21 clamped in the rotating hole, and a vertical anti-rotation rod 804 is rotatably connected in the anti-slip bearing 21; the bottom end of the anti-rotation rod 804 is fixed with a through-wall butt welding machine 7; the vertical plate surface of the L-shaped fixed arm beam 9 is provided with an embedded groove, and the bottom of the embedded groove is fixed with an electric control positioning pin 19 extending vertically downward from the extension rod, and the output shaft of the electric control positioning pin 19 A roller frame 20 is fixed at the end, and a tightening roller is clamped at the bottom of the roller frame 20; through the set turntable 5 and the through-wall butt welding machine 7 with a rotating mechanism 8, the two battery cells 603 close to each other at the same end of the battery box 601 can be welded first at the beginning of spot welding, and then welding of other points can be carried out, which can effectively prevent the influence of the welding tension generated in the length direction on the No. 3 butt welding point, that is, forming a force-releasing butt welding, reducing the resistance between the metal electrode 604 and the butt welding point.

[0037] Reference Figure 4 and Figure 6 The rotating mechanism 8 also includes a pull rope 809 wrapped around the anti-rotation rod 804 near the top position; and two symmetrical through-baffles 805 are fixed to the circumferential outer wall of the anti-rotation rod 804, and the plane on the same side of the two through-baffles 805 is the through-plane, that is, the through-plane passes through the axial line of the anti-rotation rod 804, and the upper surface of the L-shaped fixed arm beam 9 is fixed with two limit baffles 808 with a plate angle of ninety degrees near the anti-rotation rod 804; and pressure sensors are embedded on the planes of the two limit baffles 808; reset springs 810 are fixed at both ends of the pull rope 809; through the set pull rope 809 and the two through-baffles 805, when it is necessary to control the through-wall welding machine 7 to rotate ninety degrees for welding, it is only necessary to pull one of the reset springs 810 until the through-baffle 805 touches the other pressure sensor.

[0038] Reference Figure 6 The upper surface of the L-shaped fixed arm beam 9 is fixed with an L-shaped bearing holder 802 at one end away from the anti-slip bearing 21, and the top of the L-shaped bearing holder 802 is rotatably connected to a short shaft rod, and the upper and lower ends of the short shaft rod are respectively fixed with an anti-slip wheel 806 and a worm gear 807; the outer wall of the anti-slip wheel 806 is wrapped with a rotary pull belt 803, and the two ends of the rotary pull belt 803 are respectively fixed to the ends of two reset springs 810; a servo motor 801 is fixed to the side of the L-shaped fixed arm beam 9 near the top, and a worm that meshes with the worm gear 807 is fixed to the top of the output shaft of the servo motor 801; when it is necessary to control the through-wall butt welding machine 7 to rotate ninety degrees, it is only necessary to start the servo motor 801. With the setting of the reset spring 810, it can be pulled a certain distance more, so that the reset spring 810 always generates a pre-tightening tension on the pull rope 809, ensuring that the through-wall butt welding machine 7 always remains stable.

[0039] Reference Figure 6 A counterweight extension rod 18 extending in the opposite direction is fixed to the top end of the L-shaped fixed arm beam 9 away from the anti-rotation rod 804. A strip hole is opened at the end of the counterweight extension rod 18 away from the L-shaped fixed arm beam 9, and a counterweight block is slidably connected to the strip hole; it can reduce the friction resistance of the vertical double rail 10 and ensure that the weight on both sides remains balanced.

[0040] Reference Figure 1 and Figure 5 , roller grooves are opened on the inner walls on both sides of the length direction of the positioning slot 3, and side rollers 4 are embedded in the roller grooves; the side of the top supporting plate 12 is fixed with a lifting trapezoidal slat 14; and the highest point of the lifting trapezoidal slat 14 is lower than the plane of the lower surface of the turntable 5; after welding, when the large battery module 6 is rotated to the lifting trapezoidal slat 14, it can be slowly lifted up, and at this time, the edge of the large battery module 6 can be conveniently grabbed.

[0041] Reference Figure 3 A bearing slot 121 is provided in the middle of the top supporting plate 12 ; the bearing slot 121 is used to clamp two symmetrical tapered roller bearings.

[0042] Reference Figure 2 The lower surface of the base 1 is reserved with an upwardly concave arched surface. Through such a setting, the contact surface between the base 1 and the ground can be triangular, thereby improving the stability of the device.

[0043] Reference Figure 1-Figure 2 A horizontally arranged reduction motor 13 is fixed to the lower surface of the top supporting plate 12, and a worm sleeve 15 is fixed to the top end of the output shaft of the reduction motor 13, and the outer wall of the transmission tube 16 is sleeved with a driven worm gear 2 that meshes with the worm sleeve 15; the accuracy of the stopping angle of the driven worm gear 2 and the reverse self-locking effect can be improved.

[0044] Reference Figure 2 The outer circumferential wall of the transmission tube 16 is provided with a plurality of side sections 161 symmetrically distributed near the bottom end, and electrical contact pieces connected in series to the alarm circuit are embedded on both sides of the side sections 161. A contact plate 17 is fixed to the upper surface of the base 1 near the transmission tube 16, and a telescopic push rod is fixed to the top of the push plate 17. A metal plate is fixed to the end of the extension rod of the telescopic push rod. The position of the side section 161 corresponds to the position of the positioning slot 3. When in use, the two electrical contact pieces can be touched at the same time only when the side section 161 is rotated to be parallel to the metal plate. At this time, the alarm circuit can be triggered and the reduction motor 13 can be controlled to stop rotating.

[0045] Working principle: First, place the battery box 601 with holes punched in it on the loading position of the through-wall welding equipment, and then insert the cast-welded battery cells 603 into the corresponding holes inside the battery box 601, that is, first drill a hole at the top metal electrode 604 of the battery cell 603 corresponding to the cross-shaped partition 602 inside it; adjust the through-wall welding equipment and fix the unwelded assembled large battery mold base 6 in the corresponding positioning slot 3 of the turntable 5, and start the reduction motor 13 to drive the turntable 5 to rotate slowly until the battery box 601 rotates to the welding position; then Then start the through-wall welding equipment, weld the welding points one by one, and perform spot welding in the order of No. 3 welding point 605, No. 4 welding point 606, No. 5 welding point 607, No. 2 welding point 608, and No. 1 welding point 609; after welding is completed, control the extension rod of the electronically controlled positioning pin 19 to extend to lift the through-wall welding machine 7, and then continue to rotate the turntable 5 to weld the next battery box 601. At this time, the battery box 601 that has been welded will rotate to the lifting trapezoidal slat 14, and can be lifted up by it, and then it can be grabbed and lifted away.

[0046] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for butt welding a battery, comprising the following steps, characterized in that: S1: placing the battery box (601) with holes punched in it at the loading position of the through-wall welding equipment, and then embedding the cast-welded battery cells (603) into the corresponding holes inside the battery box (601); S2: Adjust the through-wall welding equipment and fix the assembled large battery mold base (6) that has not been welded in the corresponding positioning slot (3) of the turntable (5), and slowly rotate it to the welding position; S3: Then start the through-wall welding equipment and perform spot welding in the order of the third butt welding point (605), the fourth butt welding point (606), the fifth butt welding point (607), the second butt welding point (608), and the first butt welding point (609); finally, perform quality inspection in a normal inspection manner; the fixed machine includes a base (1), the base (1) is a U-shaped structure, and a vertical back plate is fixed to the end of the upper surface of the base (1) away from the opening, and a top support plate (12) extending horizontally toward the middle of the opening of the base (1) is fixed to the top of the back support plate, and two mutually symmetrical cones are embedded in the middle of the top support plate (12) Roller bearings, and the two tapered roller bearings are rotatably connected to a same transmission tube (16), a turntable (5) is fixed to the top of the transmission tube (16), a plurality of positioning slots (3) are opened near the circumferential edge of the turntable (5) and are symmetrically distributed, and the internal dimensions of the positioning slots (3) are adapted to the external dimensions of the battery box (601); a numerical control moving platform (11) is provided on the upper surface of the top support plate (12) above the back vertical plate; and a vertical double vertical rail (10) with a notch facing the turntable (5) is provided at the top of the numerical control moving platform (11); an L-shaped fixed arm beam (9) is slidably connected to the side of the vertical double vertical rail (10), The horizontal beam end of the L-shaped fixed arm beam (9) is provided with a rotation hole, and a rotation mechanism (8) is provided in the rotation hole, the rotation mechanism (8) includes an anti-slip bearing (21) clamped in the rotation hole, and a vertical anti-rotation rod (804) is rotatably connected in the anti-slip bearing (21); a through-wall butt welding machine (7) is fixed to the bottom end of the anti-rotation rod (804); a vertical plate surface of the L-shaped fixed arm beam (9) is provided with an embedding groove, and an electric control positioning pin (19) is fixed to the bottom of the embedding groove, and a roller frame (20) is fixed to the output shaft end of the electric control positioning pin (19), and a pressing roller is clamped at the bottom of the roller frame (20); the rotation mechanism (8) also It includes a pull rope (809) wound around the anti-rotation rod (804) near the top; and two mutually symmetrical through-baffles (805) are fixed on the circumferential outer wall of the anti-rotation rod (804), and the plane on the same side of the two through-baffles (805) is the through-plane, that is, the through-plane passes through the axis of the anti-rotation rod (804), and the upper surface of the L-shaped fixed arm beam (9) is fixed near the anti-rotation rod (804) with two limit baffles (808) with a plate angle of ninety degrees; and pressure sensors are embedded on the planes of the two limit baffles (808); and reset springs (810) are fixed at both ends of the pull rope (809).

2. A battery butt welding method according to claim 1, characterized in that: An L-shaped bearing holder (802) is fixed to one end of the upper surface of the L-shaped fixed arm beam (9) away from the anti-slip bearing (21), and the top end of the L-shaped bearing holder (802) is rotatably connected to a short shaft rod, and the upper and lower ends of the short shaft rod are respectively fixed with an anti-slip wheel (806) and a worm wheel (807); the outer wall of the anti-slip wheel (806) is wrapped with a rotary pull belt (803), and the two ends of the rotary pull belt (803) are respectively fixed to the ends of two reset springs (810); a servo motor (801) is fixed to the side of the L-shaped fixed arm beam (9) near the top end, and a worm that meshes with the worm wheel (807) is fixed to the top end of the output shaft of the servo motor (801).

3. A battery butt welding method according to claim 2, characterized in that: A counterweight extension rod (18) extending in the opposite direction is fixed to the top end of the L-shaped fixed arm beam (9) away from the anti-rotation rod (804), and a strip hole is formed at the end of the counterweight extension rod (18) away from the L-shaped fixed arm beam (9), and a counterweight block is slidably connected in the strip hole.

4. A battery butt welding method according to claim 3, characterized in that: The inner walls of both sides of the positioning slot (3) in the longitudinal direction are provided with roller grooves, and side rollers (4) are embedded in the roller grooves; the side surfaces of the top support plate (12) are fixed with lifting trapezoidal slats (14); and the highest point of the lifting trapezoidal slats (14) is lower than the plane where the lower surface of the turntable (5) is located.

5. A battery butt welding method according to claim 4, characterized in that: A bearing slot (121) is provided in the middle of the top supporting plate (12).

6. A battery butt welding method according to claim 5, characterized in that: The lower surface of the base (1) is reserved with an upwardly concave arched surface.

7. A battery butt welding method according to claim 6, characterized in that: A horizontally arranged reduction motor (13) is fixed to the lower surface of the top supporting plate (12), a worm sleeve (15) is fixed to the top end of the output shaft of the reduction motor (13), and a driven worm wheel (2) meshing with the worm sleeve (15) is sleeved on the outer wall of the transmission tube (16).

8. A battery butt welding method according to claim 7, characterized in that: The outer circumferential wall of the transmission tube (16) is provided with a plurality of side sections (161) distributed symmetrically with respect to the center near the bottom end, and both sides of the side sections (161) are embedded with electrical contact pieces connected in series to the alarm circuit. A contact plate (17) is fixed to the upper surface of the base (1) near the transmission tube (16), and a telescopic support rod is fixed to the top end of the support rod, and a metal flat plate is fixed to the end of the extension rod of the telescopic support rod. The position of the side section (161) corresponds to the position of the positioning slot (3).

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