CN221755203U - Welding compacting device - Google Patents

Abstract

The utility model relates to the field of battery manufacturing technology, and in particular to a welding clamping device. The welding clamping device includes a mounting plate, multiple sets of clamping mechanisms and a movable clamping plate, wherein the multiple sets of clamping mechanisms are arranged at intervals along the length direction of the mounting plate and can be lifted and lowered on the mounting plate, the movable clamping plate is located above the mounting plate and can move along the length direction of the mounting plate, and during the movement of the movable clamping plate, at least two sets of adjacent clamping mechanisms can be driven in sequence and simultaneously to move relative to the mounting plate in the direction close to the battery cell, so as to press the busbar against the corresponding battery cell in sequence, so that the multiple sets of clamping mechanisms on the mounting plate press the busbar against the corresponding battery cell in sequence along the length direction of the mounting plate, thereby improving the protection of the outer shell and cooling device of the battery module or battery pack, and ensuring that at least two sets of clamping mechanisms simultaneously press the busbar against two battery cells, thereby improving the pressing efficiency between the busbar and the battery cell, and meeting the actual welding requirements.

Description

Welding clamping device

Technical Field

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

Background Art

In the new energy lithium battery industry, in order to meet the actual application needs, individual battery cells need to be combined into battery modules or battery packs to increase their output voltage and output current. In the process of assembling battery cells into battery modules or battery packs, the battery cells need to be connected in circuit, and the positive and negative poles of each battery cell are connected in series and/or in parallel with the busbar by welding. In this welding process, in order to ensure the quality of welding, it is necessary to pressurize the busbar and the battery cell pole. Because the battery cells are integrated together, if all the busbars are pressed against the battery cells at the same time, very large pressure will be generated, which can easily damage the bottom shell and internal cooling device in the battery module or battery pack. Therefore, it is necessary to pressurize only 3 to 4 battery cells at a time.

In the prior art, a mobile module is usually used to drive the pressure head to press down-lift-move-press down in a reciprocating cycle to achieve the compression of all the battery cells and busbars. However, the above compression process is inefficient and cannot meet the welding requirements of subsequent welding equipment. The welding equipment needs to be started and stopped repeatedly to adapt to the compression rate of the busbar and battery cells, which greatly affects the welding efficiency.

Therefore, it is urgent to invent a welding clamping device to solve the above problems.

Utility Model Content

The utility model aims to provide a welding clamping device, so as to press the busbar against the correspondingly arranged battery cells in sequence along the arrangement direction of the battery cells, thereby improving the clamping efficiency and meeting the actual welding requirements.

To achieve this purpose, the utility model adopts the following technical solutions:

Welding clamping device, comprising:

Mounting plate;

A plurality of groups of clamping mechanisms, which are arranged at intervals along the length direction of the mounting plate and are all liftably disposed on the mounting plate; and

A movable pressure plate is located above the mounting plate and can move along the length direction of the mounting plate, and during the movement of the movable pressure plate, at least two adjacent groups of the clamping mechanisms can be driven in sequence and simultaneously to move relative to the mounting plate in a direction close to the battery cells, so as to press the busbar against the corresponding battery cells in sequence.

As a preferred solution, each group of the clamping mechanisms comprises:

At least two clamping assemblies, the clamping end of each clamping assembly is arranged opposite to the pole of the corresponding battery cell, and the busbar can be pressed between the clamping end of the clamping assembly and the pole of the battery cell.

As a preferred solution, each clamping assembly includes:

A pressing piece, wherein the pressing piece can press the busbar onto the corresponding pole; and

A buffer structure, wherein the buffer structure can provide buffering for the abutment between the pressing piece and the bus bar.

As a preferred solution, the buffer structure includes:

A fixing member, which is passed through the mounting plate and can slide relative to the mounting plate in a vertical direction, and the bottom of the fixing member is connected to the pressing member;

The elastic member is sleeved outside the fixing member, and two ends of the elastic member are respectively in contact with the mounting plate and the pressing member.

As a preferred solution, the pressing member is provided with a first avoidance opening, the movable pressing plate is provided with a second avoidance opening, and the mounting plate is provided with a third avoidance opening;

The second avoidance opening, the third avoidance opening and the first avoidance opening are connected to each other;

The welding equipment can pass through the second avoidance opening, the third avoidance opening and the first avoidance opening in sequence to weld and fix the busbar to the pole of the battery cell.

As a preferred solution, a gas flow channel is provided in the pressing member, and the protective gas can be sprayed onto the busbar along the gas flow channel.

As a preferred solution, an annular opening is provided at one end of the pressing member abutting against the bus, the annular opening is communicated with the gas flow channel, and the protective gas in the gas flow channel can be sprayed onto the bus along the annular opening.

As a preferred solution, a plurality of fixing members are provided in each of the buffer structures.

As a preferred solution, each group of the clamping mechanisms is provided with a first docking piece, and the movable pressure plate is provided with a second docking piece, which can abut against the first docking piece and drive the first docking piece to move towards the direction close to the battery cell.

As a preferred embodiment, the first docking member is a roller, and the second docking member is provided with inclined surfaces at both ends along the length direction of the mounting plate. The two inclined surfaces are close to each other while extending outward relative to the movable pressure plate. The inclined surfaces can abut against the roller and provide guidance for the roller to move toward the direction close to the battery cell.

Beneficial effects of the utility model:

The welding clamping device provided by the utility model is characterized in that a plurality of clamping mechanisms are arranged at intervals along the length direction of the mounting plate, so that each clamping mechanism can be lifted and lowered relative to the mounting plate, and a movable pressing plate is arranged above the mounting plate, and the movable pressing plate can be moved relative to the mounting plate along the length direction of the mounting plate, so that the movable pressing plate can sequentially and simultaneously drive at least two adjacent clamping mechanisms to move relative to the mounting plate in the direction close to the battery cell during the movement, so that all the clamping mechanisms on the mounting plate can sequentially press the busbar against the corresponding battery cell under the drive of the movable pressing plate, which can reduce the pressing force applied to the outer shell and cooling device of the battery module or battery pack, improve the protection of the outer shell and cooling device of the battery module or battery pack, and improve the clamping efficiency of the busbar and the battery cell to meet the actual welding requirements; in addition, the design can omit the action of the movable module driving the pressure head to lift in the prior art, and the movable pressing plate can continuously move along the length direction of the mounting plate 300, thereby greatly improving the welding efficiency of the busbar and the battery cell.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a welding clamping device and a battery cell provided in an embodiment of the utility model;

FIG2 is a side view of a welding clamping device provided in an embodiment of the present utility model;

3 is a schematic diagram of the structure of the mounting plate and the movable pressing plate provided in an embodiment of the utility model;

Fig. 4 is a schematic cross-sectional view of the A-A section in Fig. 2;

Fig. 5 is a schematic cross-sectional view of the B-B section in Fig. 2;

FIG. 6 is a schematic structural diagram of a clamping assembly provided in an embodiment of the present utility model.

In the figure:

1000. Welding clamping device;

100, clamping mechanism; 110, clamping assembly; 111, first docking member; 112, clamping member; 1121, first avoidance port; 1122, gas flow channel; 113, connecting member; 1131, fourth avoidance port; 1132, second penetration hole; 114, fixing member; 115, elastic member;

200, movable pressing plate; 210, second docking member; 220, second avoidance opening;

300, mounting plate; 310, third avoidance opening; 320, first pair of interfaces; 330, first penetration hole;

2000. Battery cells.

DETAILED DESCRIPTION

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

In the process of assembling battery cells into battery modules or battery packs, the battery cells need to be connected in circuits, and the positive and negative electrodes of each battery cell are connected in series and/or in parallel with the busbars by welding. In this welding process, in order to ensure the quality of welding, it is necessary to apply pressure between the busbar and the battery cell poles. Since the battery cells are integrated together, if all the busbars are pressed against the battery cells at the same time, very high pressure will be generated, which can easily damage the bottom shell and internal cooling device in the battery module or battery pack. Therefore, it is necessary to press the busbars on only 3 to 4 battery cells at a time.

In the prior art, a mobile module is usually used to drive the pressure head to press down-lift-move-press down in a reciprocating cycle to achieve the compression of all the battery cells and busbars. However, the above compression process is inefficient and cannot meet the welding requirements of subsequent welding equipment. The welding equipment needs to be started and stopped repeatedly to adapt to the compression rate of the busbar and battery cells, which greatly affects the welding efficiency.

In order to solve the above problems, as shown in Figures 1 and 2, this embodiment provides a welding clamping device 1000. The welding clamping device 1000 includes a mounting plate 300, a movable clamping plate 200, and a plurality of clamping mechanisms 100, wherein the plurality of clamping mechanisms 100 are arranged at intervals along the length direction of the mounting plate 300 and can be lifted and lowered on the mounting plate 300, the movable clamping plate 200 is located above the mounting plate 300 and can move along the length direction of the mounting plate 300, and during the movement of the movable clamping plate 200, at least two adjacent clamping mechanisms 100 can be driven to move relative to the mounting plate 300 toward the direction close to the battery cell 2000 in sequence, so as to press the busbar against the corresponding battery cell 2000 in sequence.

The welding clamping device 1000 is provided with a plurality of clamping mechanisms 100 on the mounting plate 300 along the length direction thereof, so that each clamping mechanism 100 can be lifted and lowered relative to the mounting plate 300, and a movable clamping plate 200 is provided above the mounting plate 300, so that the movable clamping plate 200 can move relative to the mounting plate 300 along the length direction of the mounting plate 300, and the movable clamping plate 200 can sequentially and simultaneously drive at least two adjacent clamping mechanisms 100 to move relative to the mounting plate 300 toward the direction close to the battery cell 2000 during the movement process, so that all the clamping mechanisms 100 on the mounting plate 300 can be lifted and lowered relative to the mounting plate 300. 00 can press the busbar against the corresponding battery cells 2000 in sequence under the drive of the movable pressing plate 200, and can reduce the pressing force applied to the outer shell and cooling device of the battery module or battery pack, thereby improving the protection of the outer shell and cooling device of the battery module or battery pack, and at the same time, improve the pressing efficiency of the busbar and the battery cell 2000 to meet the actual welding requirements; in addition, this design can omit the action of the movable module driving the pressure head to lift in the prior art, and the movable pressing plate 200 can continuously move along the length direction of the mounting plate 300, thereby greatly improving the welding efficiency of the busbar and the battery cell 2000.

It should be noted that in this embodiment, when the battery cells 2000 are assembled into a battery module or a battery pack, the battery cells 2000 are arranged in an array, and the length direction of the mounting plate 300 is the direction in which the battery cells 2000 are arranged in a row. By arranging multiple groups of clamping mechanisms 100 in an interval manner and being able to be raised and lowered along the length direction of the mounting plate 300, the busbar can be clamped between multiple battery cells 2000. Moreover, the movable pressing plate 200 can simultaneously drive three groups of adjacent clamping mechanisms 100 to move toward the direction close to the battery cells 2000, that is, the welding clamping device 1000 can simultaneously press three groups of battery cells 2000 against the corresponding busbars. In other embodiments, the row arrangement direction of the multiple battery cells 2000 can also be adjusted according to actual needs. It is only necessary to ensure that the row arrangement direction of the multiple battery cells 2000 is the same as the arrangement direction of the multiple groups of clamping mechanisms 100 on the mounting plate 300 and the moving direction of the movable pressing plate 200. In addition, the specific amount by which the movable pressing plate 200 synchronously drives the clamping mechanism 100 to move toward the direction close to the battery cells 200 can also be adjusted according to actual needs, and this embodiment does not make any specific limitations.

Specifically, in this embodiment, as shown in FIG1 , the movable platen 200, the mounting plate 300, the clamping mechanism 100, and the battery cells 2000 are sequentially arranged from top to bottom, and the battery cells 2000 are arranged in rows along the front-to-back direction. In other embodiments, the movable platen 200, the mounting plate 300, the clamping mechanism 100, and the battery cells 2000 may also be sequentially arranged along other directions, and the battery cells 2000 may also be sequentially arranged along other directions, which is not specifically limited in this embodiment.

Further, each group of clamping mechanisms 100 includes at least two clamping assemblies 110, wherein the clamping end of each clamping assembly 110 is arranged opposite to the pole of the corresponding battery cell 2000, and the busbar can be pressed between the clamping end of the clamping assembly 110 and the pole of the battery cell 2000. By pressing the busbar between the clamping end of the clamping assembly 110 and the pole of the battery cell 2000, it is convenient for subsequent welding equipment to weld and fix the busbar to the pole of the battery cell 2000. It should be noted that since the battery cell 2000 is usually provided with a positive pole and a negative pole, in this embodiment, the clamping mechanism 100 includes two clamping assemblies 110. The two clamping assemblies 110 are respectively arranged opposite to the positive pole and the negative pole on the battery cell 2000, so as to simplify the structure of the clamping mechanism 100 on the basis of ensuring the normal pressing of the clamping mechanism 100 against the busbar. In other embodiments, three, four or more clamping assemblies 110 may be provided in each group of clamping mechanisms 100, and each pole is provided corresponding to a plurality of clamping assemblies 110, and the clamping ends of the plurality of clamping assemblies 110 jointly clamp the busbar against the same pole, which is not specifically limited in this embodiment.

In this embodiment, each clamping assembly 110 is provided with a first docking member 111, and the movable pressing plate 200 is provided with a second docking member 210, which can abut against the first docking member 111 and drive the first docking member 111 to move toward the direction close to the battery cell 2000. By providing the first docking member 111 on each set of clamping assemblies 110 and the second docking member 210 on the movable pressing plate 200, the second docking member 210 abuts against the first docking member 111 and drives the first docking member 111 to move toward the direction close to the battery cell 2000, thereby achieving the effect of driving the clamping assembly 110 to move toward the direction close to the battery cell 2000.

Specifically, the first docking member 111 is a roller, and the second docking member 210 is provided with inclined surfaces at both ends along the length direction of the mounting plate 300. The two inclined surfaces extend outward relative to the movable pressure plate 200 and approach each other. The inclined surfaces can abut against the roller and provide guidance for the roller to move toward the direction close to the battery cell 2000. At the same time, the friction generated when the second docking member 210 presses the first docking member 111 can be reduced, reducing the wear of both, thereby extending the service life of the entire clamping assembly 110.

It should be noted that, in this embodiment, since the welding and clamping device 1000 can simultaneously press the three groups of battery cells 2000 against the corresponding busbars, the extension distance of the docking surface of the second docking member 210 along the length direction of the mounting plate 300 is equal to or slightly greater than the sum of the thicknesses of the three battery cells 2000. In other embodiments, the extension distance of the second docking member 210 along the length direction of the mounting plate 300 can be adjusted according to actual needs.

When the movable pressure plate 200 moves relative to the mounting plate 300 along the length direction of the mounting plate 300, the second docking piece 210 on the movable pressure plate 200 contacts the first docking piece 111 on the clamping assembly 110 until the inclined surface at the end of the second docking piece 210 abuts against the first docking piece 111. As the movable pressure plate 200 continues to move, the abutting force applied by the second docking piece 210 to the first docking piece 111 gradually increases, and the inclined surface converts the pressure applied by the second docking piece 210 to the first docking piece 111 into a thrust extending along the moving direction of the second docking piece 210 and a abutting force extending toward the direction approaching the battery cell 2000, thereby driving the first docking piece 111 to move toward the direction approaching the battery cell 2000 while rotating relative to the inclined surface, thereby achieving the effect of the movable pressure plate 200 driving the clamping assembly 110 to move toward the direction approaching the battery cell 2000.

As the movable platen 200 continues to move, the movable platen 200 moves to another group of clamping assemblies 110 adjacent to the above-mentioned clamping assemblies 110, repeats the up and down driving process, and drives the clamping assemblies 110 to move toward the direction close to the battery cell 2000.

It should be noted that, in this embodiment, as shown in Figures 1 to 3, a first docking port 320 is provided on the mounting plate 300, and the first docking member 111 extends upward from the first docking port 320 to abut against the second docking member 210. When the movable pressure plate 200 moves above the mounting plate 300, the second docking member 210 will drive the first docking member 111 to move downward.

As an optional solution, as shown in FIGS. 4 to 6 , each group of clamping assemblies 110 includes a clamping member 112 and a buffer structure, wherein the clamping member 112 can clamp the busbar to the corresponding pole, and the buffer structure can provide a buffer for the abutment between the clamping member 112 and the busbar. By providing a buffer structure to provide a buffer for the abutment between the clamping member 112 and the busbar, the clamping member 112 is prevented from impacting the busbar and the battery cell 2000 located below the busbar with a large force, and the protection of the battery cell 2000 and the busbar can be further improved.

Specifically, the buffer structure includes a fixing member 114 and an elastic member 115, wherein the fixing member 114 is passed through the mounting plate 300 and can slide in a vertical direction relative to the mounting plate 300, the bottom of the fixing member 114 is connected to the clamping member 112, the elastic member 115 is sleeved outside the fixing member 114, and the two ends of the elastic member 115 are respectively abutted against the mounting plate 300 and the clamping member 112, and the elastic deformation of the elastic member 115 is used to provide a buffer for the abutment between the clamping member 112 and the bus.

In this embodiment, the buffer structure further includes a connecting member 113, a first docking member 111 is fixed on the connecting member 113, and two ends of the elastic member 115 are respectively in contact with the connecting member 113 and the pressing member 112. After the pressing member 112 is in contact with the busbar, if the second docking member 210 continues to drive the first docking member 111 to move downward (towards the direction close to the battery cell 2000), the connecting member 113 will move downward with the first docking member 111, thereby compressing the elastic member 115 disposed between the connecting member 113 and the pressing member 112, and the elastic member 115 absorbs the pressing force of the first docking member 111, thereby providing a buffer for the contact between the pressing member 112 and the busbar.

It should be noted that, in this embodiment, the fixing member 114 is a bolt, the elastic member 115 is a spring, the mounting plate 300 is provided with a first through hole 330, the connecting member 113 is provided with a second through hole 1132, the bolt is respectively fitted with the first through hole 330 and the second through hole 1132, the nut diameter of the bolt is larger than the diameter of the first through hole 330, so as to ensure that the nut of the bolt can be abutted and fixed with the mounting plate 300, the threaded portion of the bolt is passed through the first through hole 330 and the second through hole 1132 and then threadedly fixed with the clamping member 112, the spring is sleeved on the threaded portion of the bolt, and the two ends of the spring are respectively fixed with the connecting member 113 and the clamping member 112. The spring and the bolt have a simple structure and are easy to assemble.

In order to further improve the structural strength of the clamping assembly 110, a plurality of fixing members 114 are provided in each buffer structure. The bottoms of the plurality of fixing members 114 are connected to the clamping member 112 after passing through the mounting plate 300 from top to bottom, and each fixing member 114 is provided corresponding to an elastic member 115, which can improve the buffering effect of the elastic member 115 on the clamping member 112 while improving the connection strength between the clamping member 112 and the connecting member 113. It should be noted that, in the present embodiment, four fixing members 114 are provided in the buffer structure, and the bottoms of the four fixing members 114 are connected to the clamping member 112 after passing through the mounting plate 300 from top to bottom, and an elastic member 115 is sleeved on each fixing member 114. In other embodiments, the specific number of fixing members 114 in the buffer structure can also be adjusted according to actual needs, and this embodiment does not make a specific limitation.

In order to facilitate the subsequent welding equipment to weld and fix the busbar and the pole ear of the battery cell 2000 that are pressed together, as shown in Figures 3 to 6, the pressing member 112 is provided with a first avoidance opening 1121, the movable pressing plate 200 is provided with a second avoidance opening 220, the mounting plate 300 is provided with a third avoidance opening 310, and the connecting member 113 is provided with a fourth avoidance opening 1131. The second avoidance opening 220, the third avoidance opening 310, the fourth avoidance opening 1131 and the first avoidance opening 1121 are mutually conductive, and the welding equipment can pass through the second avoidance opening 220, the third avoidance opening 310, the fourth avoidance opening 1131 and the first avoidance opening 1121 in sequence to weld and fix the busbar and the pole of the battery cell 2000. It should be noted that in this embodiment, the welding equipment welds and fixes the busbar and the pole by laser flying welding. The specific welding of the laser flying welding technology belongs to the prior art and will not be repeated here. In other embodiments, the busbar and the pole may be welded and fixed by other welding methods, which are not specifically limited in this embodiment.

In order to improve the welding protection of the busbar and the pole during the welding process, as shown in Figures 4 and 5, a gas flow channel 1122 is provided in the pressing member 112, and the shielding gas can be sprayed on the busbar along the gas flow channel 1122. By providing a gas flow channel 1122 for shielding gas input in the pressing member 112, shielding gas can be sprayed toward the busbar during the welding process of the busbar and the pole by the welding equipment, so as to avoid oxidation of the busbar and the pole during the welding process. It should be noted that in this embodiment, the shielding gas is carbon dioxide, and in other embodiments, the shielding gas can also be other inert gases, which is not specifically limited in this embodiment.

Furthermore, an annular opening is provided at one end of the pressing piece 112 abutting against the busbar, and the annular opening is communicated with the gas flow channel 1122, so that the shielding gas in the gas flow channel 1122 can be sprayed onto the busbar along the annular opening. By providing an annular opening at one end of the pressing piece 112 abutting against the busbar, the shielding gas in the gas flow channel 1122 is sprayed onto the busbar along the annular opening, so that the shielding gas can be evenly sprayed onto the welding area of the busbar and the pole, thereby further improving the welding protection of the busbar and the pole.

Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (10)

1. A welding clamping device, characterized in that it comprises: Mounting plate (300); A plurality of groups of pressing mechanisms (100), wherein the plurality of groups of pressing mechanisms (100) are arranged at intervals along the length direction of the mounting plate (300) and are all arranged on the mounting plate (300) in a manner that allows them to be lifted or lowered; and A movable pressing plate (200) is located above the mounting plate (300) and is movable along the length direction of the mounting plate (300), and in the process of the movable pressing plate (200) moving, it is capable of sequentially and simultaneously driving at least two groups of adjacent clamping mechanisms (100) to move relative to the mounting plate (300) in a direction close to the battery cell (2000), so as to sequentially press the busbar against the corresponding battery cell (2000). 2. The welding clamping device according to claim 1, characterized in that each set of the clamping mechanism (100) comprises: At least two clamping assemblies (110), the clamping end of each clamping assembly (110) is arranged opposite to the pole of the corresponding battery cell (2000), and the busbar can be pressed between the clamping end of the clamping assembly (110) and the pole of the battery cell (2000). 3. The welding clamping device according to claim 2, characterized in that each clamping assembly (110) comprises: A pressing piece (112), wherein the pressing piece (112) is capable of pressing the busbar onto the corresponding pole; and A buffer structure, wherein the buffer structure can provide buffering for the abutment between the pressing piece (112) and the bus bar. 4. The welding clamping device according to claim 3, characterized in that the buffer structure comprises: A fixing member (114) is inserted through the mounting plate (300) and can slide in a vertical direction relative to the mounting plate (300), and a bottom of the fixing member (114) is connected to the pressing member (112); The elastic member (115) is sleeved outside the fixing member (114), and two ends of the elastic member (115) are respectively in contact with the mounting plate (300) and the pressing member (112). 5. The welding clamping device according to claim 4, characterized in that the clamping member (112) is provided with a first avoidance opening (1121), the movable pressing plate (200) is provided with a second avoidance opening (220), and the mounting plate (300) is provided with a third avoidance opening (310); The second avoidance opening (220), the third avoidance opening (310), and the first avoidance opening (1121) are connected to each other; The welding equipment can pass through the second avoidance opening (220), the third avoidance opening (310), and the first avoidance opening (1121) in sequence and then weld and fix the busbar to the pole of the battery cell (2000). 6. The welding clamping device according to claim 4 is characterized in that a gas flow channel (1122) is provided in the clamping member (112), and the shielding gas can be sprayed onto the busbar along the gas flow channel (1122). 7. The welding clamping device according to claim 6 is characterized in that an annular opening is provided at one end of the clamping piece (112) abutting against the bus, and the annular opening is connected to the gas flow channel (1122), and the protective gas in the gas flow channel (1122) can be sprayed onto the bus along the annular opening. 8. The welding clamping device according to claim 4 is characterized in that a plurality of the fixing members (114) are provided in each of the buffer structures. 9. The welding clamping device according to claim 1 is characterized in that a first docking member (111) is provided on each group of the clamping mechanisms (100), and a second docking member (210) is provided on the movable pressure plate (200), and the second docking member (210) can abut against the first docking member (111) and drive the first docking member (111) to move toward the direction close to the battery cell (2000). 10. The welding clamping device according to claim 9 is characterized in that the first docking member (111) is a roller, and the second docking member (210) is provided with inclined surfaces at both ends along the length direction of the mounting plate (300), and the two inclined surfaces are close to each other while extending outward relative to the movable pressing plate (200), and the inclined surfaces can abut against the roller and provide guidance for the roller to move toward the direction close to the battery cell (2000).