CN219632962U

CN219632962U - Welding auxiliary device

Info

Publication number: CN219632962U
Application number: CN202320663569.0U
Authority: CN
Inventors: 李彦辉; 张亚儒; 李小珂
Original assignee: Lanjun New Energy Technology Co ltd
Current assignee: Lanjun New Energy Technology Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-09-05
Anticipated expiration: 2033-03-29

Abstract

The utility model belongs to the technical field of battery production, and discloses a welding auxiliary device, which comprises a bottom plate, a clamping assembly and a pressing assembly, wherein the bottom plate is configured to support the bottom of a shell, the top of the shell is provided with a splicing seam, the clamping assembly comprises two clamping plates, the shell is positioned between the two clamping plates, the two clamping plates are in sliding connection with the bottom plate, the sliding direction of the clamping plates is vertical to the side wall of the shell, the pressing assembly comprises a pressing driving piece and a pressing plate, the driving end of the pressing driving piece is connected with the pressing plate, so that the pressing plate presses the top of the shell, an avoidance gap on the pressing plate is used for avoiding the splicing seam.

Description

Welding auxiliary device

Technical Field

The utility model relates to the technical field of battery production, in particular to a welding auxiliary device.

Background

The battery generally comprises a battery cell, a shell and an end cover, wherein the battery cell is arranged in the shell, and the end cover is plugged at the opening of the shell.

Common shell production mode is to bend and splice the plates, and then weld at the splice. At present, the above-mentioned splicing process is usually carried out by adopting a manual splicing mode, but the problem of misplacement of the spliced part easily occurs in the manual splicing, and then the problem of low welding yield occurs.

Therefore, there is a need to provide a welding auxiliary device to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide a welding auxiliary device which can splice and fix a bent shell and can reduce the probability of splicing dislocation of a splicing seam.

To achieve the purpose, the utility model adopts the following technical scheme:

welding auxiliary device, comprising:

a base plate configured to support a bottom of the housing, a top of the housing having a splice seam;

the clamping assembly comprises two clamping plates, the shell is positioned between the two clamping plates, the two clamping plates are both in sliding connection with the bottom plate, and the sliding direction of the clamping plates is vertical to the side wall of the shell;

the pressing assembly comprises a pressing driving piece and a pressing plate, wherein the driving end of the pressing driving piece is connected with the pressing plate, so that the pressing plate presses the top of the shell, an avoidance gap is formed in the pressing plate, and the avoidance gap is used for avoiding a position for a splicing joint.

Optionally, the welding auxiliary device further comprises a tensioning assembly, the tensioning assembly comprises a support, a lower tensioning plate, an upper tensioning plate and a tensioning driving piece, the support is mounted on the bottom plate, the lower tensioning plate and the upper tensioning plate are configured to be arranged in the shell, the lower tensioning plate is mounted on the support to press the bottom of the shell in the shell, the upper tensioning plate is slidably mounted on the support, and the tensioning driving piece is configured to drive the upper tensioning plate and the lower tensioning plate to be far away from each other, so that the upper tensioning plate and the lower tensioning plate are matched in the shell to upwards tension the top of the shell.

Optionally, the tensioning assembly further comprises a driving rod, a pushing block and a pushing structure, the driving rod penetrates through the support, the driving rod is movably connected with the support, the driving end of the tensioning driving piece is connected with the driving rod, the driving direction of the tensioning driving piece is the axis direction of the driving rod, part of the driving rod is located between the lower tensioning plate and the upper tensioning plate, the pushing block is fixed on the driving rod, and the pushing structure is configured to enable the pushing block moving along with the driving rod to push the upper tensioning plate to slide towards a direction away from the lower tensioning plate.

Optionally, the pushing structure comprises a first movable groove, a first side wall and a second side wall, the first movable groove is formed in the lower tensioning plate, the groove bottom of the first movable groove is inclined towards the axis of the driving rod, the first side wall and the second side wall are two side walls which are oppositely arranged by the pushing block, the first side wall is inclined towards the axis of the driving rod, the first side wall is in sliding connection with the groove bottom of the first movable groove and is in butt joint, and the second side wall is in sliding connection with the upper tensioning plate and is in butt joint.

Optionally, the pushing structure comprises a second movable groove, a first side wall and a second side wall, the second movable groove is formed in the upper tensioning plate, the groove bottom of the second movable groove is inclined towards the axis of the driving rod, the first side wall and the second side wall are two side walls which are oppositely arranged by the pushing block, the second side wall is inclined towards the axis of the driving rod, the second side wall is in sliding connection with the groove bottom of the second movable groove and is in butt joint, and the first side wall is in sliding connection with the lower tensioning plate and is in butt joint.

Optionally, the pushing structure comprises a first movable groove, a second movable groove, a first side wall and a second side wall, wherein the first movable groove is formed in the lower tensioning plate, the second movable groove is formed in the upper tensioning plate, the first side wall and the second side wall are two side walls which are oppositely arranged by the pushing block, the groove bottom of the first movable groove, the groove bottom of the second movable groove, the first side wall and the second side wall are inclined towards the axis of the driving rod, the first side wall is in sliding connection with the groove bottom of the first movable groove and is in butt joint, and the second side wall is in sliding connection with the groove bottom of the second movable groove and is butt joint.

Optionally, the quantity of ejector pad and pushing structure is a plurality of, and a plurality of ejector pad and a plurality of pushing structure one-to-one, a plurality of ejector pad are along the axis direction evenly distributed of actuating lever.

Optionally, the tensioning assembly further comprises a tensioning drive, the fixed end of the tensioning drive being mounted on the base plate.

Optionally, the upper tensioning plate comprises a first tensioning plate and a second tensioning plate, the first tensioning plate is slidably mounted on the support, the second tensioning plate is fixed at one end of the first tensioning plate far away from the lower tensioning plate, and the second tensioning plate is a heat conducting piece.

Optionally, the clamping assembly further includes two clamping driving members, the driving ends of the two clamping driving members are respectively connected with the two clamping plates, and the driving directions of the two clamping driving members are parallel and opposite to drive the two clamping plates to move towards directions approaching to each other respectively.

The beneficial effects are that:

according to the welding auxiliary device provided by the utility model, the bottom of the shell is placed on the bottom plate, the splicing seam at the top of the shell is upward, then the two clamping plates are respectively slid, the two clamping plates are enabled to slide towards the side wall of the shell until the two clamping plates clamp the shell at the two sides of the shell, and then the pressing driving piece drives the pressing plate to press the top of the shell, so that the splicing and fixing of the shell are realized, when the splicing seam on the shell is welded, the welding wire passes through the avoiding seam on the pressing plate to weld the splicing seam, and therefore, the welding auxiliary device is capable of clamping and fixing the splicing seam at the two sides of the shell by adopting the two clamping plates, the butt joint of the splicing seam is realized by the pressing of the pressing plates at the top of the shell, and because of the clamping effect of the two clamping plates on the side wall of the shell, the splicing seam is reduced in the splicing dislocation probability, and the yield of the shell welding is further improved.

Drawings

FIG. 1 is a schematic view of a housing according to a first embodiment;

FIG. 2 is a schematic view of a welding auxiliary device according to the first embodiment;

FIG. 3 is a schematic illustration of a tensioning assembly according to the first embodiment without showing the tensioning drive;

FIG. 4 is a schematic diagram of a tensioning assembly according to a second embodiment without showing the tensioning drive;

FIG. 5 is a cross-sectional view taken along the direction A-A in FIG. 4;

fig. 6 is a schematic cross-sectional structure of a push block according to the first embodiment.

In the figure:

10. a housing; 11. a sidewall; 12. a splice joint;

100. a bottom plate; 210. a clamping plate; 211. a cross plate; 212. a vertical plate; 220. clamping the driving member; 310. compressing the driving piece; 320. a pressing plate; 321. avoiding the gap; 410. a support; 420. a lower tension plate; 421. a first movable groove; 430. an upper tensioning plate; 431. a first tensioning plate; 432. a second tensioning plate; 433. a second movable groove; 440. a driving rod; 450. a pushing block; 451. a first sidewall; 452. a second sidewall; 460. tensioning the drive.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

The embodiment provides a welding auxiliary device, can splice and fix the casing after buckling to can reduce the probability that the splice seam splice misplaced.

Specifically, as shown in fig. 1 and 2, the welding auxiliary device includes a bottom plate 100, a clamping assembly and a pressing assembly, wherein the bottom plate 100 is configured to support the bottom of the housing 10, the top of the housing 10 has a splice joint 12, the clamping assembly includes two clamping plates 210, the housing 10 is located between the two clamping plates 210, the two clamping plates 210 are both slidably connected with the bottom plate 100, the sliding direction of the clamping plates 210 is perpendicular to the side wall 11 of the housing 10, the pressing assembly includes a pressing driving member 310 and a pressing plate 320, the pressing plate 320 is located at the outer side of the housing 10, the driving end of the pressing driving member 310 is connected with the pressing plate 320, so that the pressing plate 320 presses the top of the housing 10, a avoiding gap 321 is provided on the pressing plate 320, and the avoiding gap 321 is used for avoiding the splice joint 12.

Based on the design, place the bottom of casing 10 on bottom plate 100, make splice seam 12 at casing 10 top up, then slide two splint 210 respectively, make two splint 210 all slide towards the lateral wall 11 of casing 10, until two splint 210 press from both sides tight casing 10 at casing 10, make again compress tightly driving piece 310 drive clamp plate 320 compress tightly the top of casing 10, thereby realize splice and fixed casing 10, when splice seam 12 on casing 10 welds, make the welding wire pass the dodge gap 321 on clamp plate 320, weld splice seam 12 can, it is tight fixed to adopt two splint 210 to clamp it at the both sides of casing 10, adopt clamp plate 320 to compress tightly it at the top of casing 10 to fix, the butt joint of splice seam 12 has been realized through the clamp action of clamp plate 320, and because the clamp plate 210 to the lateral wall 11 of casing 10, splice seam 12 splice dislocation's probability has been reduced, and then the yields of casing 10 welding has been improved.

Alternatively, the number of the pressing driving members 310 may be plural, and, for example, the number of the pressing driving members 310 may be two, three, four, or the like, and the plurality of pressing driving members 310 are uniformly distributed along the length direction of the pressing plate 320, so that the pressing force applied by the pressing plate 320 to the top of the housing 10 can be relatively uniform.

Alternatively, as shown in fig. 1 to 3, the clamping assembly further includes two clamping driving members 220, the driving ends of the two clamping driving members 220 are respectively connected to the two clamping plates 210, and the driving directions of the two clamping driving members 220 are parallel and opposite to drive the two clamping plates 210 to move toward each other, respectively, until the two clamping plates 210 are clamped on the two side walls 11 of the housing 10. Of course, in other embodiments, the two clamping plates 210 may be moved toward each other by manual pushing.

Further, as shown in fig. 1 to 3, the clamping plate 210 includes a vertical plate 212 and a horizontal plate 211, the vertical plate 212 is fixedly connected with the horizontal plate 211, so that the clamping plate 210 is substantially an L-shaped plate, wherein a fixed end of the clamping driving member 220 is mounted on the bottom plate 100, a driving end of the clamping driving member 220 is connected with the horizontal plate 211, so that the horizontal plate 211 slides on the bottom plate 100, and the two vertical plates 212 are respectively located at two sides of the housing 10 to clamp the two side walls 11 of the housing 10. Further, the fixed end of the pressing driving member 310 is mounted on the vertical plate 212 to improve the uniformity of the overall structure of the welding auxiliary device.

Alternatively, as shown in fig. 1 to 3, the welding auxiliary device further includes a tension assembly including a holder 410, a lower tension plate 420, an upper tension plate 430, and a tension driver 460, the holder 410 being mounted on the base plate 100, the lower tension plate 420 and the upper tension plate 430 being configured to be disposed in the housing 10, the lower tension plate 420 being mounted on the holder 410 to press a bottom of the housing 10 inside the housing 10, the upper tension plate 430 being slidably mounted on the holder 410, the tension driver 460 being configured to drive the upper tension plate 430 and the lower tension plate 420 away from each other such that the upper tension plate 430 and the lower tension plate 420 are fitted inside the housing 10 to upwardly tension a top of the housing 10. The tensioning assembly is arranged to realize the tensioning action on the shell 10, specifically, the lower tensioning plate 420 presses the bottom of the shell 10 in the shell 10, the upper tensioning plate 430 moves towards a direction away from the lower tensioning plate 420 and jacks up the top of the shell 10 in the shell 10, so that the tensioning action on the shell 10 in the shell 10 is realized under the interaction of the upper tensioning plate 430 and the lower tensioning plate 420, and the dislocation probability of the splice 12 at the top of the shell 10 can be further reduced through the tensioning action;

secondly, when the splice joint 12 is welded, the upper tensioning plate 430 which is upwards propped against the top of the shell 10 in the shell 10 can play a role in supporting the top of the shell 10, so that the welding difficulty of the splice joint 12 is effectively reduced, and the welding efficiency is further improved;

thirdly, the two clamping plates 210 clamp the two side walls 11 of the shell 10 at the outer side of the shell 10, the top of the shell 10 is pressed downwards by the pressing plates 320, and the upper tensioning plate 430 and the lower tensioning plate 420 are matched in the shell 10 to tension the shell 10, so that the fixing effect on the shell 10 is further improved, the welding efficiency can be improved, the potential safety hazards of welding can be eliminated, and the safety of welding operation is improved;

finally, in the prior art, after the shell 10 is manually spliced, spot welding is often required to be performed at the splicing position, so that the splicing position is simply fixed, then full welding is performed at the splicing position, but spot welding spots cannot be covered during full welding, after the welding is finished, the spot welding spots of the spot welding protrude out of the surface of the shell 10, the appearance and the assembly size of the shell 10 are affected, the welding auxiliary device provided by the embodiment is characterized in that the top of the shell 10 is pressed downwards by the pressing plate 320 outside the shell 10, the top of the shell 10 is jacked upwards by the tensioning plate 430 in cooperation with the upper tensioning plate 430, the fixation of the splicing seam 12 at the top of the shell 10 is realized, and then when the splicing seam 12 is welded, the spot welding process can be omitted, the spot welding spots of the spot welding are directly fully welded at the splicing seam 12, the problem that the spot welding spots protrude out of the surface of the shell 10 after the full welding is solved, so that the appearance of the shell 10 is more attractive, and the assembly size of the shell 10 is not affected.

Preferably, as shown in fig. 2 to 5, the upper tension plate 430 includes a first tension plate 431 and a second tension plate 432, the first tension plate 431 is slidably mounted on the supporter 410, the second tension plate 432 is fixed at one end of the first tension plate 431 far away from the lower tension plate 420, the second tension plate 432 is a heat conductive member, and illustratively, the second tension plate 432 may be a copper plate or an aluminum plate, etc., when the upper tension plate 430 lifts up the top of the housing 10 upward in the housing 10, the second tension plate 432 is in direct contact with the top of the housing 10, and when the splice joint 12 is welded, the second tension plate 432 having a heat conductive property can play a heat dissipation role, preventing the housing 10 in the vicinity of the splice joint 12 from being deformed due to high temperature, thereby further improving the welding yield.

Alternatively, the lower tensioning plate 420 may be fixedly mounted on the support 410 or may be slidably mounted on the support 410, and if the lower tensioning plate 420 is slidably mounted on the support 410, the sliding direction of the lower tensioning plate 420 is only required to be a direction away from the upper tensioning plate 430.

Further, as shown in fig. 2 to 5, the tensioning assembly further includes a driving rod 440, a pushing block 450 and a pushing structure, the driving rod 440 is penetrated through the support 410, the driving rod 440 is movably connected with the support 410, the driving end of the tensioning driving member 460 is connected with the driving rod 410, the driving direction of the tensioning driving member 460 is the axial direction of the driving rod 410, a part of the driving rod 440 is located between the lower tensioning plate 420 and the upper tensioning plate 430, the pushing block 450 is fixed on the driving rod 440, the pushing structure is configured such that the pushing block 450 moving along with the driving rod 440 pushes the upper tensioning plate 430 to slide in a direction away from the lower tensioning plate 420, when the driving rod 440 moves along the axial direction thereof, the pushing block 450 moves along with the driving rod 440, and the pushing structure pushes the upper tensioning plate 430 to move in a direction away from the lower tensioning plate 420 so as to realize an upward jacking effect on the top of the housing 10 inside the housing 10.

Alternatively, as shown in fig. 2 to 5, a fixed end of the tension driving member 460 is mounted on the base plate 100 to improve the overall structural consistency of the welding assistance device.

Preferably, further, as shown in fig. 5, the number of the pushing blocks 450 and the number of the pushing structures are multiple, the number of the pushing blocks 450 and the number of the pushing structures are in one-to-one correspondence, for example, the number of the pushing blocks 450 may be three, four, five, or the like, the number of the pushing blocks 450 is uniformly distributed along the axial direction of the driving rod 440, and in the axial direction of the driving rod 440, the pushing blocks 450 can jointly act to push the upper tensioning plate 430 upwards, so that the stress of the upper tensioning plate 430 is relatively uniform, and further, the tensioning force applied by the upper tensioning plate 430 to the top of the housing 10 is relatively uniform.

Alternatively, the tensioning drive 460, the clamping drive 220, and the compression drive 310 may be reciprocating air cylinders or lead screw progressive motors, or the like.

Alternatively, as shown in fig. 5 and 6, the pushing structure includes a first movable slot 421, a second movable slot 433, a first side wall 451 and a second side wall 452, the first movable slot 421 is opened on the lower tensioning plate 420, the second movable slot 433 is opened on the first tensioning plate 431, the first side wall 451 and the second side wall 452 are two side walls of the pushing block 450 which are oppositely disposed, the bottom of the first movable slot 421, the bottom of the second movable slot 433, the first side wall 451 and the second side wall 452 are all inclined towards the axis of the driving rod 440, the first side wall 451 is slidably connected and abutted with the bottom of the first movable slot 421, the second side wall 452 is slidably connected and abutted with the bottom of the second movable slot 433, when the pushing block 450 moves along the axis direction of the driving rod 440, the bottom of the first movable slot 421 applies an upward pushing force to the first side wall 451, and the second side wall 452 applies an upward pushing force to the bottom of the second movable slot 433, thereby realizing that the pushing block 450 pushes the first tensioning plate 431 upwards, so that the first tensioning plate 431 and the second tensioning plate 431 are together pushed up towards the top 10 of the upper tensioning plate 420 in a direction away from the top 10 of the sliding housing 10.

Example two

The present embodiment provides a welding auxiliary device, which is different from the welding auxiliary device provided in the first embodiment in that:

the pushing structure comprises a first movable groove 421, a first side wall 451 and a second side wall 452, the first movable groove 421 is formed in the lower tensioning plate 420, the groove bottom of the first movable groove 421 is inclined towards the axis of the driving rod 440, the first side wall 451 and the second side wall 452 are two side walls of the pushing block 450, which are oppositely arranged, the first side wall 451 is inclined towards the axis of the driving rod 440, the first side wall 451 is in sliding connection and abutting connection with the groove bottom of the first movable groove 421, and the second side wall 452 is in sliding connection and abutting connection with the first tensioning plate 431.

When the push block 450 moves along the axial direction of the driving rod 440 along with the driving rod 440, the groove bottom of the first movable groove 421 applies an upward pushing force to the first sidewall 451, so that the second sidewall 452 applies an upward pushing force to the first tension plate 431, thereby realizing that the push block 450 pushes the first tension plate 431 upward, so that the first tension plate 431 and the second tension plate 432 slide together in a direction away from the lower tension plate 420 to jack up the top of the housing 10 upward inside the housing 10.

The other structures of the welding auxiliary device provided in this embodiment are the same as those of the first embodiment, and will not be described again.

Example III

the pushing structure comprises a second movable groove 433, a first side wall 451 and a second side wall 452, the second movable groove 433 is arranged on the first tensioning plate 431, the groove bottom of the second movable groove 433 is inclined towards the axis of the driving rod 440, the first side wall 451 and the second side wall 452 are two side walls of the pushing block 450 which are oppositely arranged, the second side wall 452 is inclined towards the axis of the driving rod 440, the second side wall 452 is in sliding connection and butt with the groove bottom of the second movable groove 433, and the first side wall 451 is in sliding connection and butt with the lower tensioning plate 420.

When the push block 450 moves along the axial direction of the driving rod 440 with the driving rod 440, the lower tension plate 420 provides a supporting force to the first side wall 451, and the second side wall 452 applies an upward pushing force to the bottom of the second movable groove 433, thereby enabling the push block 450 to push the first tension plate 431 upward such that the first tension plate 431 and the second tension plate 432 slide together in a direction away from the lower tension plate 420 to jack up the top of the housing 10 upward inside the housing 10.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. Welding auxiliary device, its characterized in that includes:

-a base plate (100), the base plate (100) being configured to support a bottom of a housing (10), a top of the housing (10) having a splice seam (12);

the clamping assembly comprises two clamping plates (210), the shell (10) is positioned between the two clamping plates (210), the two clamping plates (210) are both in sliding connection with the bottom plate (100), and the sliding direction of the clamping plates (210) is perpendicular to the side wall (11) of the shell (10);

the pressing assembly comprises a pressing driving piece (310) and a pressing plate (320), wherein the driving end of the pressing driving piece (310) is connected with the pressing plate (320), so that the pressing plate (320) presses the top of the shell (10), an avoidance gap (321) is formed in the pressing plate (320), and the avoidance gap (321) is used for avoiding the splicing gap (12).

2. The welding assistance device according to claim 1, further comprising a tensioning assembly comprising a stand (410), a lower tensioning plate (420), an upper tensioning plate (430) and a tensioning drive (460), the stand (410) being mounted on the base plate (100), the lower tensioning plate (420) and the upper tensioning plate (430) being configured to be disposed in the housing (10), the lower tensioning plate (420) being mounted on the stand (410) to press against a bottom of the housing (10) inside the housing (10), the upper tensioning plate (430) being slidably mounted on the stand (410), the tensioning drive (460) being configured to drive the upper tensioning plate (430) and the lower tensioning plate (420) away from each other such that the upper tensioning plate (430) and the lower tensioning plate (420) cooperate to tension a top of the housing (10) upwards inside the housing (10).

3. The welding assistance device according to claim 2, wherein the tensioning assembly further comprises a driving rod (440), a pushing block (450) and a pushing structure, the driving rod (440) is arranged through the support (410), the driving rod (440) is movably connected with the support (410), the driving end of the tensioning driving piece (460) is connected with the driving rod (440), the driving direction of the tensioning driving piece (460) is the axial direction of the driving rod (440), a part of the driving rod (440) is located between the lower tensioning plate (420) and the upper tensioning plate (430), the pushing block (450) is fixed on the driving rod (440), and the pushing structure is configured to enable the pushing block (450) moving along with the driving rod (440) to push the upper tensioning plate (430) to slide in a direction away from the lower tensioning plate (420).

4. A welding assistance device according to claim 3, characterized in that the pushing structure comprises a first movable groove (421), a first side wall (451) and a second side wall (452), the first movable groove (421) is formed in the lower tensioning plate (420), the groove bottom of the first movable groove (421) is inclined towards the axis of the driving rod (440), the first side wall (451) and the second side wall (452) are two side walls which are oppositely arranged for the pushing block (450), the first side wall (451) is inclined towards the axis of the driving rod (440), the first side wall (451) is slidably connected and abutted to the groove bottom of the first movable groove (421), and the second side wall (452) is slidably connected and abutted to the upper tensioning plate (430).

5. A welding auxiliary device according to claim 3, wherein the pushing structure comprises a second movable groove (433), a first side wall (451) and a second side wall (452), the second movable groove (433) is formed on the upper tensioning plate (430), the groove bottom of the second movable groove (433) is inclined towards the axis of the driving rod (440), the first side wall (451) and the second side wall (452) are two side walls which are oppositely arranged with respect to the pushing block (450), the second side wall (452) is inclined towards the axis of the driving rod (440), the second side wall (452) is slidably connected and abutted with the groove bottom of the second movable groove (433), and the first side wall (451) is slidably connected and abutted with the lower tensioning plate (420).

6. A welding auxiliary device according to claim 3, wherein the pushing structure comprises a first movable groove (421), a second movable groove (433), a first side wall (451) and a second side wall (452), the first movable groove (421) is formed on the lower tensioning plate (420), the second movable groove (433) is formed on the upper tensioning plate (430), the first side wall (451) and the second side wall (452) are two side walls which are oppositely arranged with respect to the pushing block (450), the groove bottom of the first movable groove (421), the groove bottom of the second movable groove (433), the first side wall (451) and the second side wall (452) are inclined towards the axis of the driving rod (440), the first side wall (451) is slidably connected with and abutted against the groove bottom of the first movable groove (421), and the second side wall (452) is slidably connected with and abutted against the groove bottom of the second movable groove (433).

7. A welding auxiliary device according to claim 3, wherein the number of the pushing blocks (450) and the pushing structures is plural, the pushing blocks (450) and the pushing structures are in one-to-one correspondence, and the pushing blocks (450) are uniformly distributed along the axial direction of the driving rod (440).

8. Welding aid according to any of claims 2-7, characterized in that the fixed end of the tensioning drive (460) is mounted on the base plate (100).

9. The welding assistance device according to any one of claims 2-7, characterized in that the upper tensioning plate (430) comprises a first tensioning plate (431) and a second tensioning plate (432), the first tensioning plate (431) being slidably mounted on the carrier (410), the second tensioning plate (432) being fixed at an end of the first tensioning plate (431) remote from the lower tensioning plate (420), the second tensioning plate (432) being a heat conducting member.

10. Welding assistance device according to any one of claims 1-7, characterized in that the clamping assembly further comprises two clamping drives (220), the driving ends of the two clamping drives (220) being connected to the two clamping plates (210) respectively, the driving directions of the two clamping drives (220) being parallel and opposite to each other for driving the two clamping plates (210) respectively to move in directions towards each other.