CN115770939A - Battery module tilting mechanism and automatic spot welding device - Google Patents

Abstract

The invention belongs to the technical field of battery processing equipment, and particularly relates to a battery module turnover mechanism and an automatic spot welding device, wherein the turnover mechanism comprises a limiting assembly, a driving assembly and a rotating assembly, and the limiting assembly is provided with an opening cavity; the driving assembly is arranged in the opening cavity and is used for driving the battery module to enter or leave the opening cavity; the output end of the rotating assembly is in driving connection with the limiting assembly; the limiting assembly is located on a moving path of the battery module, and the rotating assembly is used for driving the limiting assembly to rotate so as to drive the battery module located in the opening cavity to turn. Traditional manipulator clamping jaw complex construction has been abandoned, makes the upset action simplify and effective, simultaneously, drive assembly only need realize the rotation action can, accord with the structure that this drive assembly required, for example, the price ratio manipulator of structures such as rotating electrical machines, step motor is cheap, and then effectual reduction battery module tilting mechanism's cost is favorable to the enterprise to press the development.

Description

Battery module turning mechanism and automatic spot welding device

technical field

The invention belongs to the technical field of battery processing equipment, and in particular relates to a battery module turning mechanism and an automatic spot welding device.

Background technique

With the development, application and popularization of modern power electronics technology, rechargeable batteries, especially lithium batteries, have been widely used in various electric, electric and electronic products, and almost all of these products use battery packs composed of single cells. To realize the connection and assembly of the battery pack, the role of the conductive connecting piece cannot be ignored. During the processing, the nickel sheet (conductive connecting sheet) is spot-welded on the positive and negative electrodes of the battery. Generally, manual hand-held molds are used for spot welding, and the nickel sheet and battery are placed in a special mold for positioning, and then Manual spot welding.

For example, the applicant’s previously published application number is: CN201721489870.5, and the invention patent named a lithium battery automatic spot welding machine discloses: a lithium battery automatic spot welding machine, including a frame, the frame A feeding mechanism is provided on the top, and a positive electrode welding mechanism, a turning mechanism and a negative electrode welding mechanism are arranged along the feeding mechanism; the feeding mechanism sends the object to be welded to the positive electrode welding mechanism for welding, and is turned over after being transported to the turning mechanism. Finally, it is delivered to the negative electrode welding mechanism for welding. The invention provides an automatic spot welding machine for lithium batteries. Mechanical automation replaces the manual operation of operators, which not only improves the accuracy and precision of processing, but also improves work efficiency and ensures the consistency of products.

The spot welding machine can realize automatic spot welding and double-sided spot welding through the turning mechanism. However, the turning mechanism is a combined action of the clamping manipulator and the rotating structure to realize the turning. The mechanism drives the overturning mechanism to move to prevent the overturning mechanism from interfering with the movement of the battery. The overall operation structure is more complicated, which leads to a decrease in the production efficiency of the device, which is not conducive to the development of the enterprise.

Contents of the invention

The purpose of the present invention is to provide a battery module turning mechanism and automatic spot welding device, aiming to solve the problem that the turning part structure of the battery module spot welding device in the prior art is cumbersome, the overall operation structure is complicated, and the production efficiency of the device is reduced instead. , It is not conducive to the technical problems of enterprise development.

In order to achieve the above object, an automatic flip spot welding device provided by an embodiment of the present invention includes a limiting assembly, a driving assembly and a rotating assembly, the limiting assembly is provided with an opening cavity; the driving assembly is arranged on the opening The cavity is used to drive the battery module to enter or leave the open cavity; the output end of the rotating component is connected to the limiting component; the limiting component is located on the moving path of the battery module, and the rotating component is used to The limiting component is driven to rotate to drive the battery module located in the open cavity to turn over.

Optionally, the limiting assembly includes a connection frame and an adjustment component, the connection frame is rotatably connected to the moving path of the battery module; the adjustment component is arranged on the connection frame; the opening cavity is formed on On the connecting frame, the driving assembly is arranged at the driving end of the adjusting part, and the adjusting part is used to adjust the distance between the driving end of the driving assembly and the battery module.

Optionally, the adjusting part includes a moving unit and a connecting plate, the moving unit is arranged on the connecting frame; the connecting plate is slidably connected to the connecting frame and is located in the opening cavity; the The connecting plate is connected with the moving end of the moving unit, and the driving assembly is arranged on the connecting plate.

Optionally, the connection frame includes a mounting frame and a mold frame, the mounting frame is arranged on the moving path of the battery module; the mold frame is rotatably connected to the mounting frame; the opening cavity is formed on the In the mold base, the mold base is connected with the driving end of the rotating assembly, the rotating assembly is arranged on the installation frame, the driving end of the rotating assembly is connected with the driving of the mold base, and the moving unit is arranged on On the formwork, the connecting plate is slidably connected to the column of the formwork.

Optionally, the drive assembly includes two sets of conveying units symmetrically arranged on both sides of the battery module moving path, the two sets of conveying units are connected to the limit assembly, and the two sets of conveying units form a In the passage for the battery module to move, the conveying directions of the two conveying units are opposite to each other.

Optionally, the two groups of conveying units can be relatively movable for adjusting the channel width between the two groups of conveying units.

Optionally, the conveying unit is a belt conveyor, and the conveying path of the conveying unit passes through the opening of the open cavity.

The above-mentioned one or more technical solutions in the battery module overturning mechanism provided by the embodiments of the present invention have at least one of the following technical effects: the battery module is driven into the open cavity by the drive component, and the rotation component drives the limit component to turn over, so that The end face of the battery module that is not spot-welded faces the welding head of the spot welding device. After the spot welding is completed, the drive assembly drives the battery module to leave the open cavity; compared with the reverse part structure of the battery module spot welding device in the prior art It is cumbersome and the overall operation structure is complex, which leads to a decrease in the production efficiency of the device, which is not conducive to the technical problems of enterprise development. The battery module turning mechanism provided by the embodiment of the present invention abandons the traditional complex structure of the manipulator claws, making the turning action simple and effective. , at the same time, the driving component only needs to realize the rotation action, and the structure that meets the requirements of the driving component, for example, the price of the rotating motor, stepping motor and other structures is lower than that of the manipulator, thereby effectively reducing the cost of the battery module turning mechanism. Conducive to the development of enterprises.

In order to achieve the above object, an embodiment of the present invention provides an automatic spot welding device, including the above battery module turning mechanism.

Optionally, the automatic spot welding device also includes a workbench, a transportation mechanism and a spot welding mechanism, the transportation mechanism is arranged on the workbench and used to transport the battery module; the spot welding mechanism is arranged on the working table and is used for spot welding the battery modules located on the delivery path of the transport mechanism.

Optionally, the spot welding mechanism includes two sets of spot welding modules, the battery module overturning mechanism is arranged in the middle section of the transport path of the transport mechanism, and the two sets of spot welding modules are respectively located Set flip mechanism on both sides.

The above one or more technical solutions in the automatic spot welding device provided by the embodiment of the present invention have at least one of the following technical effects: since the automatic spot welding device adopts the above-mentioned battery module turning mechanism, the battery module is driven into the In the open cavity, the rotating component drives the limit component to turn over, so that the unspot-welded end of the battery module faces the welding head of the spot welding device. After the spot welding is completed, the drive component drives the battery module to leave the open cavity; compared with the existing The structure of the overturning part of the battery module spot welding device in the art is cumbersome, and the overall operation structure is complicated, which leads to a decrease in the production efficiency of the device and is not conducive to the technical problem of enterprise development. The battery module overturn mechanism provided by the embodiment of the present invention abandons The complex structure of the traditional manipulator jaws simplifies and effectively flips the action. At the same time, the drive component only needs to realize the rotation action. The structure that meets the requirements of the drive component, for example, the price of the structure such as rotating motor and stepping motor is lower than that of the manipulator. , and then effectively reduce the cost of the battery module turning mechanism, which is conducive to the development of enterprises.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

Fig. 1 is a schematic structural diagram of an automatic spot welding device provided by an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a battery module turning mechanism provided by an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a pushing assembly provided by an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a spot welding assembly provided by an embodiment of the present invention.

Fig. 5 is a structural schematic diagram of the battery module turning mechanism provided by the embodiment of the present invention

FIG. 6 is a structural schematic diagram of another angle of the battery module turning mechanism provided by the embodiment of the present invention.

Fig. 7 is a schematic structural diagram of an adjustment component provided by an embodiment of the present invention.

Wherein, each reference sign in the figure:

100—workbench 200—transport mechanism 300—spot welding mechanism

400—Battery module turning mechanism 410—Limiting component 420—Drive component

430—rotating assembly 440—open cavity 450—rib

310—spot welding assembly 411—connecting frame 412—adjusting parts

413—Mobile unit 414—Connection plate 416—Mounting frame

415—formwork 421—conveyor unit 510—limit rib

520—Push assembly 521—Push piece 522—Block

600—width adjustment component 610—drive source 620—fixed seat

630—moving seat 640—width limiting plate 710—supporting seat

720—grinding plate 700—welding head height fine-tuning part 312—spot welding head

311—multi-axis mobile platform.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings 1 to 7 are exemplary and are intended to explain the embodiments of the present invention, and should not be construed as limitations of the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical ", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying Describes, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate in a specific orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the embodiments of the present invention, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense unless otherwise clearly specified and limited. Disassembled connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention according to specific situations.

In one embodiment of the present invention, as shown in FIGS. 1-7 , an automatic spot welding device is provided, including the battery module turning mechanism 400 described above. The automatic spot welding device also includes a workbench 100, a transportation mechanism 200 and a spot welding mechanism 300, the transportation mechanism 200 is arranged on the workbench 100 and is used to transport the battery module; the spot welding mechanism 300 is arranged on the on the workbench 100 and is used for spot welding the battery modules located on the delivery path of the transport mechanism 200 .

In this embodiment, the workbench 100 is arranged on the upper end of a machine base, the inner cavity of the machine base is used to accommodate parts, the workbench 100 is covered on the upper end of the inner cavity on the machine base, and the transport mechanism 200 is a belt conveyor.

The battery module turning mechanism 400 includes a limit assembly 410, a drive assembly 420 and a rotation assembly 430, the limit assembly 410 is provided with an open cavity 440; the drive assembly 420 is arranged in the open cavity 440 and used When the battery module is driven to enter or leave the open cavity 440; the output end of the rotating assembly 430 is driven and connected to the limiting assembly 410; the limiting assembly 410 is located on the moving path of the battery module, and the rotating assembly 430 It is used to drive the limiting assembly 410 to rotate to drive the battery module located in the opening cavity 440 to turn over. Wherein, the end of the opening cavity 440 away from the opening is provided with a rib 450 .

In this embodiment, the two groups of transportation mechanisms 200, the transportation systems of the two groups of transportation mechanisms 200 are set independently, that is, the transportation paths of the two groups of transportation mechanisms 200 operate independently, wherein the battery modules Group turnover mechanism 400 is arranged on the middle position of two groups of described transport mechanisms 200, and, described spot welding mechanism 300 comprises two groups of spot welding assemblies 310, and two groups of described spot welding assemblies 310 are respectively arranged in one-to-one correspondence between the two groups. On one side of the transportation path of the transportation mechanism 200, through the transfer of the battery module turning mechanism 400, the battery modules are on the delivery ends of different transportation mechanisms 200, and the faces to be spot-welded facing the corresponding spot welding components 310 are different.

Specifically, the battery module is driven into the open cavity 440 by the drive assembly 420, and the rotation assembly 430 drives the limit assembly 410 to turn over, so that the unspot-welded end of the battery module faces the welding head of the spot welding device. After the spot welding is completed, The drive assembly 420 drives the battery module to leave the open cavity 440; compared with the battery module spot welding device in the prior art, the structure of the turning part is cumbersome, and the overall operation structure is complicated, which leads to a decrease in the production efficiency of the device, which is not conducive to the development of the enterprise technical problem, the battery module turning mechanism 400 provided by the embodiment of the present invention abandons the complex structure of the traditional manipulator claws, and makes the turning action simple and effective. The structure required by 420, for example, the price of structures such as rotating motors and stepping motors is lower than that of manipulators, thereby effectively reducing the cost of the battery module turning mechanism 400, which is conducive to the development of enterprises.

As shown in Figures 5-7, further, the limit assembly 410 includes a connection frame 411 and an adjustment component 412, the connection frame 411 is rotatably connected to the moving path of the battery module; the adjustment component 412 is arranged on the The connecting frame 411; the opening cavity 440 is formed on the connecting frame 411, the driving assembly 420 is arranged at the driving end of the adjusting part 412, and the adjusting part 412 is used to adjust the driving assembly 420 The distance between the driving end and the battery module. Specifically, different types of battery modules have different thicknesses and sizes. Therefore, setting an adjustment component 412 to adjust the distance between the drive assembly 420 and the battery module can prevent larger battery modules from entering the opening cavity 440. , and prevent the battery module with a smaller size from moving too much in the opening cavity 440 when turning over, which will cause damage to the battery module, and further improve the practicability of the turning mechanism.

As shown in Figures 5 to 7, further, the adjusting part 412 includes a moving unit 413 and a connecting plate 414, the moving unit 413 is arranged on the connecting frame 411; the connecting plate 414 is slidably connected to the connecting frame 411 The frame 411 is located in the opening cavity 440 ; the connecting plate 414 is connected to the moving end of the moving unit 413 , and the driving assembly 420 is disposed on the connecting plate 414 .

Specifically in this embodiment, the moving unit 413 is a motor screw pair linear structure, the screw mandrel of the moving unit 413 is rotatably connected in the open cavity 440, and the nut of the moving unit 413 is fixedly connected with the connecting plate 414 , when the motor drives the screw to rotate, the nut can drive the connecting plate 414 to move along a preset direction, thereby realizing the position adjustment of the driving assembly 420 .

As shown in Figures 5-7, further, the connection frame 411 includes a mounting frame 416 and a mold frame 415, the mounting frame 416 is arranged on the moving path of the battery module; the mold frame 415 is rotatably connected to the On the mounting frame 416; the opening cavity 440 is formed in the mold frame 415, the mold frame 415 is connected to the driving end of the rotating assembly 430, and the rotating assembly 430 is arranged on the mounting frame 416, the The driving end of the rotating assembly 430 is drivingly connected to the mold frame 415 , the moving unit 413 is disposed on the mold frame 415 , and the connecting plate 414 is slidably connected to a column of the mold frame 415 .

Specifically, the cross-section of the mounting frame 416 is arranged in a 匚-shaped structure, the formwork 415 includes a top plate and a bottom plate, a column is connected between the top plate and the bottom plate, and the two ends of the top plate and the bottom plate A rotating plate is provided, the rotating plate is rotatably connected to the stand, and the rotating plate is connected to the driving end of the rotating assembly 430 , and in this embodiment, the rotating assembly 430 is a stepping motor.

As shown in FIGS. 5-7 , further, the driving assembly 420 includes two sets of conveying units 421 symmetrically arranged on both sides of the battery module moving path, and the two sets of conveying units 421 are connected to the limit assembly 410 Above, a passage for the battery module to move is formed between the two groups of conveying units 421 , and the conveying directions of the two groups of conveying units 421 are opposite to each other.

The working principle of the conveying unit 421: in the initial state, the open cavity 440 is set along the horizontal direction, the conveying direction of the conveying unit 421 located below is consistent with the conveying direction of the conveying mechanism 200 at the front end, and the conveying mechanism 200 at the front ends the battery When the module is transported to the opening position of the open cavity 440, the front-end transport unit 421 drives the battery module to enter the open cavity 440; after the rotating assembly 430 drives the connecting frame 411 to rotate, the upper transport unit 421 rotates to the bottom and the transport unit The transportation direction of 421 is consistent with the transportation direction of the transportation mechanism 200 at the rear end. The transportation unit 421 drives the battery module out of the open cavity 440, and is received and transported to a preset position by the transportation mechanism 200 at the rear section.

The transport structure is simple and the effect is remarkable. At the same time, the two sets of transport units 421 are traditional linear module structures, which do not require complex positioning programming. The battery module can be turned over with the rotation component 430, which greatly reduces battery life. Module production costs.

As shown in FIGS. 5-7 , further, the two groups of conveying units 421 can be relatively movable for adjusting the channel width between the two groups of conveying units 421 . Specifically, the conveying unit 421 is a belt conveyor, and the conveying end surface of the conveying unit 421 is parallel to the top plate and the bottom plate, wherein one group of the conveying units 421 is fixedly arranged on the top plate, and the other A group of the conveying units 421 is arranged on the connecting plate 414. When the moving unit 413 drives the connecting plate 414 to move, the two groups of the moving units 413 move closer or farther apart, thereby adapting to battery modules of different sizes. Group.

As shown in Figures 1-4, further, the automatic spot welding device further includes a positioning mechanism 500 for improving spot welding accuracy, and the positioning mechanism 500 includes a limit rib 510, a push assembly 520 and a stop assembly 530, the limit rib 510 is arranged on the edge of the conveying path of the conveying mechanism.

Specifically, direction-positioning: when the battery module is driven by the transportation mechanism 200 to the vicinity of the preset spot welding position of the spot welding mechanism 300, the pushing end of the pushing component 520 moves toward the delivery path of the transportation mechanism 200 , until the pushing end abuts against the side wall of the battery module, and the battery module is driven by the thrust to move in the direction of the limit rib 510 until the battery module abuts against the limit rib 510 to realize horizontal One of the directions is positioned.

Positioning in the second direction, the end of the stopper assembly 530 moves toward the delivery path of the transport mechanism 200, and the battery module that was originally driven by the transport mechanism 200 to move normally along the delivery path stops moving after being interfered by the end of the stopper assembly 530 , to achieve positioning in the other direction of the horizontal direction.

In the whole positioning process, the most effective sequence is to perform orientation 2 positioning first, and then perform orientation 1 positioning. In this design, the pushing component 520 only needs to play a driving role, without considering the timing or distance of the pushing, further reducing the point. The positioning complexity of the welding device improves the practicability of the spot welding device.

As shown in FIGS. 1 to 4 , further, the pushing assembly 520 includes a pushing piece 521 and a pressing block 522 , and the pushing piece 521 is arranged on a side of the transportation path of the transportation mechanism 200 away from the limit rib 510 . On the side, the output end of the pusher 521 faces the delivery path of the transport mechanism 200, and the pressing block 522 is arranged at the output end of the pusher 521. In this embodiment, the pusher 521 is a cylinder, so The pusher 521 is arranged on a mounting substrate, the pressing block 522 is arranged in a strip-shaped plate structure, and a sliding bar is arranged on the pressing block 522, and the sliding bar is slidably connected with the mounting substrate, and a sliding bar structure is added. It is beneficial to improve the movement stability of the pressing block 522, so as to prevent the pressing block 522 from shifting during the moving process and improve the positioning accuracy.

As shown in Figures 1-4, further, the pushing assembly 520 includes a width-adjusting part 600, which is used to adjust the width of the conveying path of the transport mechanism 200, so as to adapt to different battery modules Stable delivery, thereby improving the flexibility of the spot welding device.

As shown in FIGS. 1 to 4 , further, the width adjustment component 600 includes a driving source 610 , a fixed seat 620 , a movable seat 630 and a width limiting plate 640 . On one side of the path, the moving seat 630 is slidingly connected with the fixed seat 620, the moving direction of the moving seat 630 is set toward the transport mechanism 200, and the width limiting plate 640 is arranged on the moving seat 630, so that The output end of the driving source 610 is drivingly connected to the moving seat 630. Specifically, the driving source 610 drives the moving seat 630 to drive the width limiting plate 640 to move, and the distance between the width limiting plate 640 and the limit rib 510 The distance can be adjusted, so as to adapt to the transportation of battery modules of different sizes. In this embodiment, the driving source 610 is a motor-transmission shaft driving structure, and the output shaft of the driving source 610 is provided with a driving gear. The driving gear meshes with the moving base 630 , and when the gear is rotated by the motor, the moving base 630 moves along a predetermined direction.

As shown in FIGS. 1-4 , further, the spot welding assembly 310 includes a multi-axis mobile platform 311 and a spot welding head 312, and the multi-axis mobile platform 311 is arranged on one side of the conveying path of the transport mechanism 200, so The spot welding head 312 is fixedly arranged on the mobile end of the multi-axis mobile platform 311. Compared with the operation mode of the traditional fixed spot welding head and the multi-axis mobile battery module for spot welding, in this embodiment, the quality The multi-axis movement of the smaller spot welding head 312 is more energy-efficient and reduces energy consumption. At the same time, the battery module is always in a static state during the spot welding process, and the spot welding accuracy is effectively improved.

As shown in Figures 1 to 4, furthermore, the spot welding assembly 310 also includes a welding head height fine-tuning part 700. After a long time of operation, part of the solder is easy to adhere to the spot welding head 312, causing the spot welding head to be distorted during electric welding. The solder residue of 312 is easily misjudged by the welding head position recognition structure in the spot welding system. The working end of the welding head 312 is easy to reduce the accuracy of spot welding, which is not conducive to the development of the enterprise. Therefore, the welding head height fine-tuning component 700 in this embodiment can prevent the accumulation of residual material on the welding head, resulting in poor spot welding effect.

Furthermore, the welding head height fine-tuning component 700 includes a support base 710, a grinding plate 720 and a height sensing unit, the support base 710 is fixedly arranged on the moving path of the multi-axis mobile platform 311, and the grinding plate 720 is set On the support base 710, the multi-axis mobile platform 311 drives the spot welding head 312 to move to the grinding plate 720, so that the solder end of the spot welding head 312 contacts the grinding plate 720, and the multi-axis moving platform 311 drives the spot welding head 312 Move back and forth on the grinding plate 720 to adjust the height of the welding head. In this embodiment, the height sensing unit is a grating sensor, and the grinding plate 720 is provided with sandpaper.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. The utility model provides a battery module tilting mechanism which characterized in that includes:

the limiting assembly is provided with an opening cavity;

the driving assembly is arranged in the opening cavity and is used for driving the battery module to enter or leave the opening cavity;

the output end of the rotating assembly is in driving connection with the limiting assembly;

the limiting assembly is located on a moving path of the battery module, and the rotating assembly is used for driving the limiting assembly to rotate so as to drive the battery module located in the opening cavity to turn.

2. The mechanism for turning over battery modules as claimed in claim 1, wherein: the spacing subassembly includes:

the connecting frame is rotatably connected to a moving path of the battery module;

an adjustment member provided on the connection frame;

the opening cavity is formed in the connecting frame, the driving assembly is arranged at the driving end of the adjusting part, and the adjusting part is used for adjusting the distance between the driving end of the driving assembly and the battery module.

3. The battery module turnover mechanism of claim 2, wherein: the adjusting part includes:

a moving unit disposed on the connection frame;

the connecting plate is connected to the connecting frame in a sliding mode and is positioned in the opening cavity;

the connecting plate is connected with the moving end of the moving unit, and the driving assembly is arranged on the connecting plate.

4. The battery module turnover mechanism of claim 3, wherein: the connection frame includes:

the mounting frame is arranged on a moving path of the battery module;

the die carrier is rotatably connected to the mounting frame;

the opening cavity is formed in the die carrier, the die carrier is connected with the driving end of the rotating assembly, the rotating assembly is arranged on the mounting frame, the driving end of the rotating assembly is in driving connection with the die carrier, the moving unit is arranged on the die carrier, and the connecting plate is in sliding connection with the stand column of the die carrier.

5. The battery module turnover mechanism according to any one of claims 1 to 4, wherein: the driving assembly comprises two groups of conveying units which are symmetrically arranged on two sides of a moving path of the battery module, the two groups of conveying units are connected to the limiting assembly, a channel for the battery module to move is formed between the two groups of conveying units, and the conveying directions of the two groups of conveying units are opposite to each other.

6. The battery module turnover mechanism of claim 5, wherein: the two groups of conveying units can move relatively to adjust the width of a channel between the two groups of conveying units.

7. The battery module turnover mechanism of claim 5, wherein: the conveying unit is a belt conveyor, and a conveying path of the conveying unit passes through an opening of the opening cavity.

8. An automatic spot welding device which characterized in that: the turnover mechanism for a battery module, which comprises the turnover mechanism for a battery module according to any one of claims 1 to 7.

9. The stitch welding device according to claim 8, wherein: this automatic spot welding device still includes:

a work table;

the conveying mechanism is arranged on the workbench and used for conveying the battery modules;

and the spot welding mechanism is arranged on the workbench and is used for performing spot welding on the battery module on the conveying path of the conveying mechanism.

10. The automatic reverse spot welding device according to claim 9, characterized in that: the spot welding mechanism comprises two groups of spot welding modules, the battery module overturning mechanism is arranged at the middle section of the conveying path of the conveying mechanism, and the two groups of spot welding modules are respectively positioned at two sides of the battery module overturning mechanism.

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