CN220407612U - Multifunctional welding device - Google Patents

Abstract

The application relates to a multifunctional welding device. The multifunctional welding device is used for welding the square shell battery cell and comprises a welding robot, a first fixing mechanism and a second fixing mechanism, wherein the first fixing mechanism and the second fixing mechanism are distributed around the welding robot at intervals. The first fixing mechanism is used for fixing the square shell battery cells, the first welding parts of the square shell battery cells face the welding robot, and the second fixing mechanism is used for fixing the square shell battery cells which are arranged in parallel. The welding robot is configured to be capable of welding a first welding portion of the square-shell battery cell on the first fixing mechanism, and is configured to be capable of welding the connecting sheet on two adjacent square-shell battery cells on the second fixing mechanism. The welding of the first welding part and the connecting sheet of the square shell battery cell is considered, so that the welding of the square shell battery cell is not required to be performed by adopting various welding equipment, and the welding cost of the square shell battery cell is further reduced.

Description

Multifunctional welding device

Technical Field

The application relates to the technical field of battery welding processes, in particular to a multifunctional welding device.

Background

In the production process of the square-shell battery cell, a plurality of welding processes are included to weld different parts of the square-shell battery cell. Therefore, a plurality of welding devices are usually arranged in the related art to weld the battery cells of the square shell, and the welding cost is high.

Disclosure of Invention

Accordingly, it is necessary to provide a multifunctional welding device for solving the problem of high welding cost for welding the battery cells of the opposite case in the related art.

A multifunctional welding device for welding square-shell cells, the multifunctional welding device comprising:

a welding robot; and

the first fixing mechanism and the second fixing mechanism are distributed at intervals around the welding robot;

the first fixing mechanism is used for fixing the square shell battery cells, enabling the first welding parts of the square shell battery cells to face the welding robot, and the second fixing mechanism is used for fixing a plurality of square shell battery cells which are arranged in parallel;

the welding robot is configured to be capable of welding the first welding part of the square-shell battery cell on the first fixing mechanism, and is configured to be capable of welding connecting pieces on two adjacent square-shell battery cells on the second fixing mechanism.

The first fixed establishment and the second fixed establishment of this application are used for spacing to square shell electric core to avoid square shell electric core to take place the displacement in welding process, influence welding effect. And first fixed establishment are laid around welding robot interval for welding robot can weld the first welding part of square shell electric core, and can weld the connection piece of square shell electric core, has taken into account the welding of first welding part and connection piece of square shell electric core, thereby need not to adopt multiple welding equipment to weld the square shell electric core, and then reduces the welding cost of square shell electric core.

In one embodiment, the multifunctional welding device comprises a plurality of first fixing mechanisms and a plurality of second fixing mechanisms, and the plurality of first fixing mechanisms and the plurality of second fixing mechanisms are distributed at intervals around the welding robot.

In one embodiment, the welding robot comprises a six axis robot.

In one embodiment, the first fixing mechanism includes a first body, two first limiting members and two second limiting members, the two first limiting members are disposed on the first body at intervals along the first direction, and the two second limiting members are disposed on the first body at intervals along the second direction;

the square shell battery cell is limited between the two first limiting pieces along the first direction and between the two second limiting pieces along the second direction;

the first direction and the second direction intersect each other.

In one embodiment, the first stop member includes a first base and a first abutment member movable in the first direction relative to the first base.

In one embodiment, the second limiting member includes a second base, a second abutting member and an elastic member, the second base and the second abutting member are disposed at intervals along the second direction, and the elastic member is elastically connected between the second base and the second abutting member.

In one embodiment, the second fixing mechanism includes a second body, two third limiting members and two fourth limiting members, the two third limiting members are disposed on the second body at intervals along the first direction, and the two fourth limiting members are disposed on the second body at intervals along the second direction;

the square shell battery cell is limited between the two third limiting pieces along the first direction and between the two fourth limiting pieces along the second direction;

the first direction and the second direction intersect each other.

In one embodiment, the third limiting member includes a third body, a third driving member and a third abutting member, where the third driving member is connected between the third body and the third abutting member, and is used to drive the third abutting member to move along the first direction so as to make the third abutting member abut against the square-shell battery cell; and/or

The fourth limiting piece comprises a fourth body, a fourth driving piece and a fourth abutting piece, wherein the fourth driving piece is connected between the fourth body and the fourth abutting piece and used for driving the fourth abutting piece to move along the second direction so that the fourth abutting piece abuts against the square shell battery cell.

In one embodiment, the second body is provided with a plurality of first through holes arranged at intervals along the first direction, and the third limiting piece is provided with a first connecting hole corresponding to the first through holes; and/or

The second body is provided with a plurality of second through holes which are arranged along the second direction at intervals, and the fourth limiting piece is provided with a second connecting hole corresponding to the second through holes.

In one embodiment, the second fixing mechanism further includes an abutting piece, where the abutting piece is disposed on one side of the square-shell battery cell and can abut against one side of the connecting piece, which faces away from the square-shell battery cell, along a third direction; wherein the third direction is parallel to the direction in which the top of the first fixing mechanism points to the bottom of the first fixing mechanism; and/or

The multifunctional welding device further comprises a universal trolley, wherein the universal trolley comprises a support frame and wheels arranged on the support frame, and the support frame is detachably connected with the first fixing mechanism or the second fixing mechanism.

Drawings

Fig. 1 is a schematic structural diagram of a multifunctional welding device according to the present application.

Fig. 2 is a schematic structural view of the welding robot shown in fig. 1.

Fig. 3 is a schematic view of the first fixing mechanism and the universal trolley shown in fig. 1.

Fig. 4 is a schematic structural view of the second fixing mechanism shown in fig. 1.

Fig. 5 is a schematic structural view of the abutting cleaning assembly shown in fig. 1.

Fig. 6 is a schematic structural view of the multifunctional welding device shown in fig. 1, provided with a protective fence.

Reference numerals illustrate:

a multi-functional welding device 100;

a welding robot 1; a robot arm 11; a weldment 12; a first fixing mechanism 2; a first body 21; a first stopper 22; a second stopper 23; a first base 24; a first abutment 25; a second base 26; a second abutment 27; an elastic member 28;

a second fixing mechanism 3; a second body 31; a third stopper 32; a fourth stopper 33; a third body 341; a third driving member 342; a third abutment 35; a fourth body 361; a fourth driving piece 362; a fourth abutment 37; a first through hole 381; a second through hole 382; a first connection hole 391; a second connecting hole 392;

abutting the cleaning assembly 4; a moving plate 40; a first rail 41; a second guide rail 42; a butt joint 43; a dust suction port 44; a shielding gas shower head 45; a protective fence 5; a general purpose trolley 6; a support frame 61; wheels 62; a square shell cell 7; a connecting piece 8;

a first direction F1; a second direction F2; and a third direction F3.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Fig. 1 is a schematic structural diagram of a multifunctional welding device 100 according to the present application. Referring to fig. 1, a multifunctional welding device 100 provided in the present application is used for welding a square-shell battery cell 7, and the multifunctional welding device 100 includes a welding robot 1, a first fixing mechanism 2, and a second fixing mechanism 3. The first fixing mechanism 2 and the second fixing mechanism 3 are arranged around the welding robot 1 at intervals, in some embodiments, the first fixing mechanism 2 is used for fixing the square shell battery cells 7, a first welding part of the square shell battery cells 7 faces the welding robot 1, the second fixing mechanism 3 is used for fixing a plurality of square shell battery cells 7 which are arranged in parallel, the first fixing mechanism 2 and the second fixing mechanism 3 are used for fixing the square shell battery cells 7, the square shell battery cells 7 are prevented from moving in the welding process, and the welding position is deviated, so that the welding effect is affected.

After the square-case cells 7 are fixed, a welding operation is performed by the welding robot 1, and the welding robot 1 is configured to be able to weld the first welding portion of the square-case cells 7 on the first fixing mechanism 2 and to be able to weld the connecting piece 8 to the adjacent two square-case cells 7 on the second fixing mechanism 3. It can be appreciated that the multifunctional welding device 100 provided by the application gives consideration to the welding of the first welding part and the connecting sheet of the square-shell battery cell 7, so that the square-shell battery cell 7 does not need to be welded by adopting various welding equipment, and the welding cost of the square-shell battery cell 7 is reduced.

In some embodiments, referring to fig. 1 and 2 in combination, fig. 2 is a schematic structural diagram of the welding robot 1 shown in fig. 1. The multifunctional welding apparatus 100 includes a plurality of first fixing mechanisms 2 and a plurality of second fixing mechanisms 3, and the plurality of first fixing mechanisms 2 and the plurality of second fixing mechanisms 3 are arranged around the welding robot 1 at intervals. The welding robot 1 comprises a six-axis robot, and the square-shell battery cell 7 on the first fixing mechanism 2 and the second fixing mechanism 3 surrounding the welding robot 1 can be welded through the six-axis robot. It can be understood that the welding robot 1 is surrounded by the first fixing mechanisms 2 and the second fixing mechanisms 3, and the welding robot 1 can weld the square shell battery cells 7 without arranging the welding robot 1 to weld different square shell battery cells 7, so that the welding cost of the square shell battery cells 7 is reduced.

In some embodiments, the welding robot 1 includes a mechanical arm 11 and a welding member 12, the welding member 12 is configured to emit welding laser, and the mechanical arm 11 drives the welding member to drive the welding member 12 toward a corresponding portion to be welded, so that the welding laser is directed to the portion to be welded to weld the portion to be welded.

Referring now to fig. 3 in combination, fig. 3 is a schematic view of the first securing mechanism 2 and the universal trolley 6 shown in fig. 1. The first fixing mechanism 2 includes a first body 21, two first limiting members 22 and two second limiting members 23, the two first limiting members 22 are disposed on the first body 21 along a first direction F1 at intervals, and the two second limiting members 23 are disposed on the first body 21 along a second direction F2 at intervals. The square-shell battery cell 7 is limited between the two first limiting pieces 22 along the first direction F1, and is limited between the two second limiting pieces 23 along the second direction F2. In other words, the two first limiting members 22 and the two second limiting members 23 form a square limiting cavity, and the square-shell battery cell 7 is limited in the limiting cavity. The first limiting piece 22 and the second limiting piece 23 are respectively abutted against the side wall of the square-shell battery cell 7, and limit the square-shell battery cell 7. Wherein the first direction F1 and the second direction F2 intersect each other.

In some embodiments, referring to fig. 3, the first limiting member 22 includes a first base 24 and a first abutment member 25, the first base 24 is fixedly connected to the first body 21, and the first abutment member 25 can move along the first direction F1 relative to the first base 24. The first abutting piece 25 abuts against the side wall of the square-shell battery cell 7, and limits the square-shell battery cell 7, so that the first welding part of the square-shell battery cell 7 faces the welding robot 1. The first abutment 25 moves with respect to the first seat 24, i.e. with respect to the first body 21. In other words, through first butt spare 25 for first body 21 moves along first direction F1, two first locating parts 22 have been adjusted along first direction F1's spacing distance to first locating part 22 can carry out spacingly to not unidimensional square shell electric core 7, corresponds the welding route of adjusting control welding robot 1, can realize but electric core welded function to different sides, and then improves the suitability of this application multi-functional welding set 100, and need not to set up multiple different welding set, reduce welding cost.

In some embodiments, the second limiting member 23 includes a second base 26, a second abutment member 27, and an elastic member 28, where the second base 26 and the second abutment member 27 are disposed at intervals along the second direction F2, and the elastic member 28 is elastically connected between the second base 26 and the second abutment member 27. It will be appreciated that the second base 26 is fixed to the first body 21, and the second abutment 27 is elastically connected to the second base 26 by an elastic member 28, so that the second abutment 27 has a certain range of movement displacement in the second direction F2. Or, when the second abutting piece 27 abuts against the side wall of the square-case battery cell 7, the elastic piece 28 is in a compressed state, and for the square-case battery cells 7 with different sizes, the second abutting piece 27 can move for a certain displacement along the second direction F2 through the elastic deformation of the elastic piece 28, so that the square-case battery cell 7 with different sizes is suitable for.

In some embodiments, the first welding portion is a connection portion between the side plate of the square-case battery cell 7 and the main body of the square-case battery cell 7, that is, the first abutting piece 25 and the second abutting piece 27 abut against two side plates of the square-case battery cell 7 in different directions respectively, and then the welding robot 1 welds the side plates on the main body of the square-case battery cell 7, so as to realize welding of the side plates of the square-case battery cell 7.

As shown in fig. 4, fig. 4 is a schematic structural view of the second fixing mechanism 3 shown in fig. 1. The second fixing mechanism 3 includes a second body 31, two third limiting members 32 and two fourth limiting members 33, the two third limiting members 32 are disposed on the second body 31 along the first direction F1 at intervals, and the two fourth limiting members 33 are disposed on the second body 31 along the second direction F2 at intervals. The square shell battery cells 7 are arranged in parallel, the connecting sheet 8 is arranged between two adjacent square shell battery cells 7, and one surface of the square shell battery cells 7 provided with the connecting sheet 8 faces the welding robot 1, so that the welding robot 1 can weld the connecting sheet 8 on the square shell battery cells 7 conveniently. After the square-shell battery cells 7 are arranged in parallel, the square-shell battery cells are limited between the two third limiting pieces 32 along the first direction F1, and are limited between the two fourth limiting pieces 33 along the second direction F2.

In some embodiments, referring to fig. 4, the third limiting member 32 includes a third body 341, a third driving member 342 and a third abutting member 35, where the third driving member 342 is connected between the third body 341 and the third abutting member 35 and is used for driving the third abutting member 35 to move along the first direction F1 so that the third abutting member 35 abuts against the square-housing battery cell 7. In some embodiments, the second body 31 is provided with a plurality of first through holes 381 spaced along the first direction F1, the third body 341 of the third limiting member 32 is provided with first connecting holes 391 corresponding to the first through holes 381, the third body 341 is detachably connected to the second body 31 through the first connecting holes 391 and the first through holes 381, and the first connecting holes 391 can be adapted to different first through holes 381 spaced along the first direction F1, so that the third limiting member 32 can be disposed at different positions of the second body 31 along the first direction F1. In other words, the limiting distance of the two third limiting members 32 along the first direction F1 can be adjusted, so that the square-case battery cells 7 with different sizes or different numbers can be limited in the first direction F1.

In some embodiments, with continued reference to fig. 4, the fourth limiting member 33 includes a fourth body 361, a fourth driving member 362, and a fourth abutting member 37, and the fourth driving member 362 is connected between the fourth body 361 and the fourth abutting member 37 and is used for driving the fourth abutting member 37 to move along the second direction F2 so that the fourth abutting member 37 abuts against the square-case battery cell 7. In some embodiments, the second body 31 is provided with a plurality of second through holes 382 spaced along the second direction F2, and the fourth limiting member 33 is provided with second connecting holes 392 corresponding to the second through holes 382. The fourth body 361 is detachably connected to the second body 31 through the second connecting hole 392 and the second through hole 382, and the second connecting hole 392 can be adapted to different second through holes 382 spaced along the second direction F2, so that the fourth limiting member 33 can be disposed at different positions of the second body 31 along the second direction F2. In other words, the limiting distance of the two fourth limiting members 33 along the second direction F2 can be adjusted, so that the square-case cells 7 with different sizes can be limited in the second direction F2.

In some embodiments, the third driving member 342 and the fourth driving member 362 are both configured as an air cylinder, the air cylinder is connected between the third body 341 and the third abutting member 35, and drives the third abutting member 35 to move along the first direction F1 relative to the third body 341, so that the third abutting member 35 abuts against the side wall of the square-case cell 7, and the other air cylinder is connected between the fourth body 361 and the fourth abutting member 37, and drives the fourth abutting member 37 to move along the first direction F1 relative to the fourth body 361, so that the fourth abutting member 37 abuts against the side wall of the square-case cell 7, and limits the square-case cell 7.

Referring to fig. 5, fig. 5 is a schematic structural view of the abutting cleaning assembly 4 shown in fig. 1. The second fixing mechanism 3 further comprises an abutting cleaning assembly 4, the abutting cleaning assembly 4 comprises an abutting joint 43, the abutting joint 43 is used for fixedly abutting the connecting sheet 8 on the square shell battery cell 7, and welding dislocation caused by movement of the connecting sheet 8 when the connecting sheet 8 and the square shell battery cell 7 are prevented from being welded. The abutting joint 43 is arranged on the second body 31 and is positioned on one side of the square-shell battery cell 7. The abutment 43 is arranged to be movable in a first direction F1 for positioning the different connection pads 8, and the abutment 43 is further arranged to be movable in a third direction F3 for abutment against a side of the connection pad 8 facing away from the square-housing cell 7. Wherein the third direction F3 is parallel to the direction in which the top of the first securing mechanism 2 points to the bottom of the first securing mechanism 2. In some embodiments, the abutting joint 43 is provided with a plurality of abutting joints 43, and the plurality of abutting joints 43 respectively correspond to different connecting pieces 8, namely, the plurality of abutting joints 43 can limit the plurality of connecting pieces 8 at the same time, the abutting joints 43 do not need to frequently move, the welding of the plurality of connecting pieces 8 can be realized only through the movement of the welding robot 1, and the welding cost is saved.

In some embodiments, the abutment cleaning assembly 4 comprises a moving plate 40, a first rail 41 and a second rail 42, the first rail 41 extending in a first direction F1, the second rail 42 extending in a third direction F3. The moving plate 40 is drivingly connected to the first rail 41 and the second rail 42, respectively, and is movable along the first rail 41 and the second rail 42. The abutting joint 43 is fixed on the moving plate 40, and moves along the first direction F1 and the third direction F3 under the driving of the moving plate 40, so as to realize the abutting limit of the connecting piece 8.

In some embodiments, the butt cleaning assembly 4 further comprises a cleaning member, the cleaning member comprises a dust collection opening 44 and a dust collection member communicated with the dust collection opening, the dust collection opening 44 of the cleaning member is arranged on the moving plate 40 and faces the square shell battery cell 7, when the welding robot 1 welds the connecting sheet 8, dust can be sucked, the influence of the dust on the connecting sheet 8 on welding is avoided, and the welding effect of the multifunctional welding device 100 is improved.

In some embodiments, the abutting cleaning assembly 4 further includes a shielding gas nozzle 45, where the shielding gas nozzle 45 is disposed on the moving plate 40 and faces the square-case cell 7, and is configured to spray shielding gas toward the square-case cell 7 to provide shielding gas for welding by the welding robot 1.

In some embodiments, the multi-function welding apparatus 100 further includes a universal trolley 6, the universal trolley 6 including a support frame 61 and wheels 62 provided on the support frame 61, the support frame 61 being configured to be detachably connectable with the first securing mechanism 2 or the second securing mechanism 3. A plurality of universal trolleys 6 can be provided, and corresponding first and second fixing mechanisms 2, 3 and square-shell cells 7 can be provided for replacement. When the welding robot 1 finishes welding the square shell battery cell 7 on the first fixing mechanism 2 or the second fixing mechanism 3, a new square shell battery cell 7 can be replaced in time for welding by the welding robot 1, so that the welding waiting time is shortened. The welding operation of the welding robot 1 and the operation of placing the square-shell battery cell 7 on the first fixing mechanism 2 or the second fixing mechanism 3 can be performed simultaneously, so that the working time is shortened, and the working efficiency is improved.

And the first fixed establishment 2 and the second fixed establishment 3 can dismantle the setting of being connected with general dolly 6 for general dolly 6 can cyclic utilization, can install square shell electricity core 7 on first fixed establishment 2 or second fixed establishment 3 earlier, and then correspond fixed general dolly 6 that first fixed establishment 2 or second fixed establishment 3 got free on, thereby can reduce the quantity of general dolly 6 in the improvement efficiency, reduce the cost.

Referring to fig. 6, fig. 6 is a schematic structural view of the multifunctional welding apparatus 100 shown in fig. 1 provided with a protective fence 5. In some embodiments, the multifunctional welding apparatus 100 further includes a protective fence 5, and a channel capable of passing through the first fixing mechanism 2 and the second fixing mechanism 3 is provided around the protective fence 5, and the first fixing mechanism 2 and the second fixing mechanism 3 can be replaced differently without disassembling the protective fence 5.

The multifunctional welding device 100 of the application has the advantages that the welding of the first welding part and the connecting sheet of the square-shell battery cell 7 is achieved, the welding of the square-shell battery cell 7 is not needed by adopting various welding equipment, and the welding cost of the square-shell battery cell 7 is reduced. And set up mobilizable universal trolley 6 to set up that first fixed establishment 2 and second fixed establishment 3 can dismantle with universal trolley 6 and be connected, when realizing the replacement of square shell electric core 7, shortened welding operating time, raise the efficiency, reduce the cost.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A multifunctional welding device for welding square-shell cells, the multifunctional welding device comprising:

a welding robot; and

the first fixing mechanism and the second fixing mechanism are distributed at intervals around the welding robot;

the first fixing mechanism is used for fixing the square shell battery cells, enabling the first welding parts of the square shell battery cells to face the welding robot, and the second fixing mechanism is used for fixing a plurality of square shell battery cells which are arranged in parallel;

the welding robot is configured to be capable of welding the first welding part of the square-shell battery cell on the first fixing mechanism, and is configured to be capable of welding connecting pieces on two adjacent square-shell battery cells on the second fixing mechanism.

2. The multi-function welding device of claim 1, comprising a plurality of the first securing mechanisms and a plurality of the second securing mechanisms, the plurality of first securing mechanisms and the plurality of second securing mechanisms being spaced around the welding robot.

3. The multi-function welding device of claim 1, wherein the welding robot comprises a six-axis robot.

4. The multifunctional welding device according to claim 1, wherein the first fixing mechanism comprises a first body, two first limiting members and two second limiting members, the two first limiting members are arranged on the first body at intervals along a first direction, and the two second limiting members are arranged on the first body at intervals along a second direction;

the square shell battery cell is limited between the two first limiting pieces along the first direction and between the two second limiting pieces along the second direction;

the first direction and the second direction intersect each other.

5. The multi-function welding device of claim 4, wherein the first stop comprises a first base and a first abutment movable in the first direction relative to the first base.

6. The device of claim 4, wherein the second limiting member comprises a second base, a second abutting member and an elastic member, the second base and the second abutting member are arranged at intervals along the second direction, and the elastic member is elastically connected between the second base and the second abutting member.

7. The multifunctional welding device according to claim 1, wherein the second fixing mechanism comprises a second body, two third limiting pieces and two fourth limiting pieces, wherein the two third limiting pieces are arranged on the second body at intervals along a first direction, and the two fourth limiting pieces are arranged on the second body at intervals along a second direction;

the square shell battery cell is limited between the two third limiting pieces along the first direction and between the two fourth limiting pieces along the second direction;

the first direction and the second direction intersect each other.

8. The device of claim 7, wherein the third limiting member comprises a third body, a third driving member and a third abutting member, the third driving member being connected between the third body and the third abutting member for driving the third abutting member to move in the first direction so that the third abutting member abuts against the square-case cell; and/or

The fourth limiting piece comprises a fourth body, a fourth driving piece and a fourth abutting piece, wherein the fourth driving piece is connected between the fourth body and the fourth abutting piece and used for driving the fourth abutting piece to move along the second direction so that the fourth abutting piece abuts against the square shell battery cell.

9. The multifunctional welding device according to claim 8, wherein the second body is provided with a plurality of first through holes arranged at intervals along the first direction, and the third limiting member is provided with a first connecting hole corresponding to the first through holes; and/or

The second body is provided with a plurality of second through holes which are arranged along the second direction at intervals, and the fourth limiting piece is provided with a second connecting hole corresponding to the second through holes.

10. The multifunctional welding device of claim 7, wherein the second fixing mechanism further comprises an abutting piece, wherein the abutting piece is arranged on one side of the square-shell battery cell and can abut against one side of the connecting piece, which faces away from the square-shell battery cell, along a third direction; wherein the third direction is parallel to the direction in which the top of the first fixing mechanism points to the bottom of the first fixing mechanism; and/or

The multifunctional welding device further comprises a universal trolley, wherein the universal trolley comprises a support frame and wheels arranged on the support frame, and the support frame is detachably connected with the first fixing mechanism or the second fixing mechanism.