CN221755203U

CN221755203U - Welding compacting device

Info

Publication number: CN221755203U
Application number: CN202420277112.0U
Authority: CN
Inventors: 李永奇; 陆彬; 蔡文刚; 高翔
Original assignee: Shanghai Juling Information Technology Co ltd
Current assignee: Shanghai Juling Information Technology Co ltd
Priority date: 2024-02-05
Filing date: 2024-02-05
Publication date: 2024-09-24
Anticipated expiration: 2034-02-05

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to a welding pressing device. The welding pressing device comprises a mounting plate, a plurality of groups of pressing mechanisms and a movable pressing plate, wherein the plurality of groups of pressing mechanisms are arranged at intervals along the length direction of the mounting plate and are arranged on the mounting plate in a lifting manner, the movable pressing plate is located above the mounting plate and can move along the length direction of the mounting plate, and at least two groups of adjacent pressing mechanisms can be sequentially and simultaneously driven to move towards the direction close to the battery core relative to the mounting plate in the moving process of the movable pressing plate, so that the bus bar is sequentially abutted against the corresponding battery core, the plurality of groups of pressing mechanisms on the mounting plate sequentially abut against the corresponding battery core along the length direction of the mounting plate, the protection of the shell of a battery module or a battery pack and the cooling device is improved, at least two groups of pressing mechanisms are simultaneously abutted against the two battery cores, the abutting efficiency of the bus bar and the battery core is improved, and the actual welding requirement is met.

Description

Welding compacting device

Technical Field

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

Background

In the lithium battery industry of new energy, in order to meet the practical application requirements, a single electric core needs to be formed into a battery module or a battery pack so as to improve the output voltage and the output current of the battery module or the battery pack. In the process of assembling the battery cells into a battery module or a battery pack, the battery cells are required to be connected in a circuit, and the positive electrode and the negative electrode of each battery cell are connected in series and/or in parallel with the busbar in a welding mode. In the welding process, in order to ensure the welding quality, the pressure needs to be applied between the busbar and the battery core pole. Because the battery cells are integrated together, if all the bus bars are abutted against the battery cells at the same time, very large pressure is generated, and the battery module or the bottom shell and the internal cooling device in the battery pack are extremely damaged, only the bus bars on 3-4 battery cells need to be pressed at a time.

In the prior art, the compression of all the cells and the bus bars is generally achieved by using a reciprocating cycle of pressing-lifting-moving-pressing by a moving module driving pressure head. However, the efficiency of the compression process is low, the welding requirements of the subsequent welding equipment cannot be met, the welding equipment needs to be repeatedly started and stopped to be matched with the compression rate of the busbar and the battery cell, and the welding efficiency is greatly influenced.

Therefore, there is a need for an inventive welding hold down device that addresses the above-described issues.

Disclosure of utility model

The utility model aims to provide a welding pressing device which sequentially presses a busbar against a correspondingly arranged battery cell along the arrangement direction of the battery cell, improves pressing efficiency and meets actual welding requirements.

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

Welding closing device includes:

a mounting plate;

The plurality of groups of pressing mechanisms are arranged at intervals along the length direction of the mounting plate and are arranged on the mounting plate in a lifting manner; and

The movable pressing plate is positioned above the mounting plate and can move along the length direction of the mounting plate, and at least two groups of adjacent pressing mechanisms can be sequentially and simultaneously driven to move towards the direction close to the battery cell relative to the mounting plate in the moving process of the movable pressing plate so as to sequentially press the busbar against the corresponding battery cell.

Preferably, each group of pressing mechanisms comprises:

The at least two compaction assemblies are arranged in a way that the compaction ends of the compaction assemblies are opposite to the corresponding poles of the battery cells, and the busbar can be abutted between the compaction ends of the compaction assemblies and the poles of the battery cells.

Preferably, each pressing assembly includes:

the pressing part is provided with a pressing part, the compression piece can compress the busbar on the corresponding pole; and

And the buffer structure can provide buffer for the abutting connection between the pressing piece and the busbar.

Preferably, the buffer structure includes:

The fixing piece is arranged in a penetrating manner on the mounting plate and can slide along the vertical direction relative to the mounting plate, and the bottom of the fixing piece is connected with the compressing piece;

The elastic piece is sleeved outside the fixing piece, and two ends of the elastic piece are respectively abutted to the mounting plate and the pressing piece.

As a preferable scheme, the pressing piece is provided with a first avoiding opening, the movable pressing plate is provided with a second avoiding opening, and the mounting plate is provided with a third avoiding opening;

the second avoidance port, the third avoidance port and the first avoidance port are communicated with each other;

The welding equipment can pass through the second avoidance port, the third avoidance port and the first avoidance port in sequence and then fixedly weld the busbar with the pole of the battery cell.

Preferably, a gas flow passage is provided in the pressing member, and the shielding gas can be sprayed on the busbar along the gas flow passage.

Preferably, an annular opening is formed at one end of the pressing member, which is abutted to the busbar, the annular opening is communicated with the gas flow passage, and the shielding gas in the gas flow passage can be sprayed on the busbar along the annular opening.

Preferably, a plurality of fixing members are provided in each of the buffer structures.

As an optimal scheme, each group of pressing mechanisms is provided with a first butt joint part, each movable pressing plate is provided with a second butt joint part, and the second butt joint parts can be abutted to the first butt joint parts and drive the first butt joint parts to move towards the direction close to the battery cell.

As a preferable scheme, the first butt joint piece is a roller, inclined planes are arranged at two ends of the second butt joint piece along the length direction of the mounting plate, the two inclined planes are close to each other when outwards extending relative to the movable pressing plate, the inclined planes can be abutted with the roller, and guiding is provided for the roller to move towards the direction close to the battery cell.

The utility model has the beneficial effects that:

According to the welding pressing device, the plurality of groups of pressing mechanisms are arranged on the mounting plate at intervals along the length direction of the mounting plate, each group of pressing mechanisms can be lifted relative to the mounting plate, the movable pressing plate is arranged above the mounting plate and can move 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 groups of pressing mechanisms to move towards the direction close to the battery core relative to the mounting plate in the moving process, all the pressing mechanisms on the mounting plate can sequentially press the bus bar on the corresponding battery core under the driving of the movable pressing plate, the pressing force applied to the shell of the battery module or the battery pack and the cooling device can be reduced, the pressing efficiency of the bus bar and the battery core is improved while the protection of the shell of the battery module or the battery pack and the cooling device is improved, and the actual welding requirement is met; in addition, the lifting action of the driving pressure head of the movable module in the prior art can be omitted, and the movable pressure plate can continuously move along the length direction of the mounting plate 300, so that the welding efficiency of the bus bar and the battery cell is greatly improved.

Drawings

Fig. 1 is a schematic structural diagram of a welding pressing device and a battery cell according to an embodiment of the present utility model;

FIG. 2 is a side view of a welding hold-down device provided in an embodiment of the present utility model;

FIG. 3 is a schematic structural diagram of a mounting plate and a movable platen according to an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of section A-A of FIG. 2;

FIG. 5 is a schematic cross-sectional view of section B-B of FIG. 2;

fig. 6 is a schematic structural view of a pressing assembly according to an embodiment of the present utility model.

In the figure:

1000. welding a compacting device;

100. A compressing mechanism; 110. a compression assembly; 111. a first docking member; 112. a pressing member; 1121. a first avoidance port; 1122. a gas flow passage; 113. a connecting piece; 1131. a fourth avoidance port; 1132. a second through hole; 114. a fixing member; 115. an elastic member;

200. A movable pressing plate; 210. a second docking member; 220. a second avoidance port;

300. A mounting plate; 310. a third avoidance port; 320. a first pair of interfaces; 330. a first through hole;

2000. And a battery cell.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

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

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

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

In the process of assembling the battery cells into a battery module or a battery pack, the battery cells are required to be connected in a circuit, and the positive electrode and the negative electrode of each battery cell are connected in series and/or in parallel with the busbar in a welding mode. In the welding process, in order to ensure the welding quality, the pressure needs to be applied between the busbar and the battery core pole. Because the battery cells are integrated together, if all the bus bars are abutted against the battery cells at the same time, very large pressure is generated, and the battery module or the bottom shell and the internal cooling device in the battery pack are extremely damaged, only the bus bars on 3-4 battery cells need to be pressed at a time.

In order to solve the above-described problems, as shown in fig. 1 and 2, the present embodiment provides a welding press apparatus 1000. The welding pressing device 1000 comprises a mounting plate 300, a movable pressing plate 200 and 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 arranged on the mounting plate 300 in a lifting manner, the movable pressing plate 200 is positioned above the mounting plate 300 and can move along the length direction of the mounting plate 300, and at least two groups of adjacent pressing mechanisms 100 can be sequentially and simultaneously driven to move towards the direction close to the battery cells 2000 relative to the mounting plate 300 in the moving process of the movable pressing plate 200 so as to sequentially press the bus bars against the corresponding battery cells 2000.

According to the welding pressing device 1000, the plurality of groups of pressing mechanisms 100 are arranged on the mounting plate 300 along the length direction of the welding pressing device, each group of pressing mechanisms 100 can be lifted relative to the mounting plate 300, the movable pressing plate 200 is arranged above the mounting plate 300, the movable pressing plate 200 can move relative to the mounting plate 300 along the length direction of the mounting plate 300, and the movable pressing plate 200 can sequentially and simultaneously drive at least two groups of adjacent pressing mechanisms 100 to move relative to the mounting plate 300 towards the direction close to the battery cell 2000 in the moving process, so that all the pressing mechanisms 100 on the mounting plate 300 can sequentially press the busbar against the corresponding battery cell 2000 under the driving of the movable pressing plate 200, the pressing force applied to the shell of the battery module or the battery pack and the cooling device can be reduced, the protection of the shell of the battery module or the battery pack and the cooling device can be improved, the pressing efficiency of the busbar and the battery cell 2000 can be improved, and the actual welding requirement can be met; in addition, the lifting action of the driving pressure head of the movable module in the prior art can be omitted, and the movable pressure plate 200 can continuously move along the length direction of the mounting plate 300, so that the welding efficiency of the bus bar and the battery cell 2000 is greatly improved.

In this embodiment, when the battery cells 2000 are assembled into the battery module or the battery pack, the battery cells 2000 are arranged in an array, the length direction of the mounting plate 300 is the row arrangement direction of the battery cells 2000, and the plurality of groups of pressing mechanisms 100 are arranged at intervals along the length direction of the mounting plate 300 and can be lifted, so that the bus bars can be pressed between the plurality of battery cells 2000. And the movable pressing plate 200 can drive the three groups of adjacent pressing mechanisms 100 to move towards the direction approaching to the battery cells 2000 at the same time, namely, the welding pressing device 1000 can simultaneously press the three groups of battery cells 2000 against corresponding bus bars. In other embodiments, the arrangement direction of the plurality of electric cores 2000 in rows may be adjusted according to the actual requirement, which only needs to ensure that the arrangement direction of the plurality of electric cores 2000 in rows is the same as the arrangement direction of the plurality of groups of pressing mechanisms 100 on the mounting plate 300 and the moving direction of the moving pressing plate 200, and the specific number of the moving pressing plates 200 that synchronously drive the pressing mechanisms 100 to move towards the direction close to the electric cores 2000 may also be adjusted according to the actual requirement.

Specifically, in the present embodiment, as shown in fig. 1, the movable platen 200, the mounting plate 300, the pressing mechanism 100, and the battery cells 2000 are sequentially arranged from top to bottom, and the battery cells 2000 are arranged in rows in the front-rear direction. In other embodiments, the movable platen 200, the mounting plate 300, the pressing mechanism 100, and the battery cells 2000 may be sequentially disposed along other directions, which is not particularly limited in this embodiment.

Further, each set of pressing mechanism 100 includes at least two pressing assemblies 110, where the pressing end of each pressing assembly 110 is disposed opposite to the pole of the corresponding battery cell 2000, and the bus bar can be abutted between the pressing end of the pressing assembly 110 and the pole of the battery cell 2000. By abutting the buss bar between the compression end of the compression assembly 110 and the pole of the battery cell 2000, it is possible to facilitate the subsequent welding equipment to weld-fix the buss bar to the pole of the battery cell 2000. It should be noted that, since the battery cell 2000 is generally provided with a positive electrode terminal and a negative electrode terminal, in this embodiment, the pressing mechanism 100 includes two pressing assemblies 110. The two compressing assemblies 110 are respectively opposite to the positive electrode post and the negative electrode post on the battery core 2000, so that the structure of the compressing mechanism 100 is simplified on the basis of ensuring the normal propping of the compressing mechanism 100 on the busbar. In other embodiments, three, four or more compression assemblies 110 may be disposed in each set of compression mechanism 100, each pole is disposed corresponding to a plurality of compression assemblies 110, and the compression ends of the plurality of compression assemblies 110 together support the bus bar against the same pole, which is not particularly limited in this embodiment.

In this embodiment, each pressing assembly 110 is provided with a first butt joint part 111, and the movable pressing plate 200 is provided with a second butt joint part 210, where the second butt joint part 210 can abut against the first butt joint part 111 and drive the first butt joint part 111 to move towards the direction approaching the battery cell 2000. By arranging the first butt joint part 111 on each group of pressing assemblies 110 and arranging the second butt joint part 210 on the movable pressing plate 200, the effect of driving the pressing assemblies 110 to move towards the direction approaching the battery cells 2000 is achieved by the butt joint of the second butt joint part 210 and the first butt joint part 111 and driving the first butt joint part 111 to move towards the direction approaching the battery cells 2000.

Specifically, the first butt-joint part 111 is a roller, two ends of the second butt-joint part 210 along the length direction of the mounting plate 300 are respectively provided with an inclined surface, the two inclined surfaces are close to each other while extending outwards relative to the movable pressing plate 200, the inclined surfaces can be abutted against the roller and provide guidance for the roller to move towards the direction close to the battery cell 2000, meanwhile, friction generated when the second butt-joint part 210 presses the first butt-joint part 111 can be reduced, abrasion of the two parts is reduced, and therefore the service life of the whole pressing assembly 110 is prolonged.

It should be noted that, in the present embodiment, since the welding pressing device 1000 can simultaneously press the three groups of the battery cells 2000 against the corresponding bus bars, the extending distance of the abutting surface of the second abutting 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 extending distance of the second docking member 210 along the length direction of the mounting plate 300 may be adjusted according to actual requirements.

When the moving platen 200 moves along the length direction of the mounting plate 300 relative to the mounting plate 300, after the second butt joint part 210 on the moving platen 200 contacts with the first butt joint part 111 on the pressing assembly 110, until the inclined surface at the end of the second butt joint part 210 abuts against the first butt joint part 111, as the moving platen 200 continues to move, the pressing force exerted by the second butt joint part 210 on the first butt joint part 111 is gradually increased, and the inclined surface converts the pressing force exerted by the second butt joint part 210 on the first butt joint part 111 into the pushing force extending along the moving direction of the second butt joint part 210 and the pressing force extending towards the direction approaching the battery cell 2000, so that the first butt joint part 111 is driven to move towards the direction approaching the battery cell 2000 while rotating relative to the inclined surface, and the effect that the moving platen 200 drives the pressing assembly 110 to move towards the direction approaching the battery cell 2000 is realized.

As the moving platen 200 continues to move, the moving platen 200 moves to another group of the pressing assemblies 110 adjacent to the pressing assemblies 110, repeats the up-down driving process, and drives the pressing assemblies 110 to move in a direction approaching the battery cells 2000.

In this embodiment, as shown in fig. 1 to 3, the mounting plate 300 is provided with a first pair of interfaces 320, and the first docking member 111 extends upward out of the first pair of interfaces 320 to abut against the second docking member 210, and during the moving process of the moving platen 200 above the mounting plate 300, the second docking member 210 drives the first docking member 111 to move downward.

As an alternative, as shown in fig. 4 to 6, each set of compression assemblies 110 includes a compression member 112 and a buffer structure, where the compression member 112 can compress the bus bar on the corresponding pole, and the buffer structure can provide a buffer for the abutment between the compression member 112 and the bus bar. Through setting up buffer structure and providing the buffering for the butt of clamp 112 and busbar, prevent clamp 112 and strike busbar and the electric core 2000 that is located the busbar below with great force, can further improve the protection to electric core 2000 and busbar.

Specifically, the buffer structure includes a fixing member 114 and an elastic member 115, where the fixing member 114 is disposed through the mounting plate 300 and can slide along a vertical direction relative to the mounting plate 300, the bottom of the fixing member 114 is connected to the pressing member 112, the elastic member 115 is sleeved outside the fixing member 114, two ends of the elastic member 115 respectively abut against the mounting plate 300 and the pressing member 112, and the elastic deformation of the elastic member 115 is utilized to provide buffer for the abutment between the pressing member 112 and the bus.

In this embodiment, the buffering structure further includes a connecting member 113, the first abutting member 111 is fixed on the connecting member 113, and two ends of the elastic member 115 are respectively abutted against the connecting member 113 and the pressing member 112. After the pressing member 112 abuts against the bus bar, if the second abutting member 210 continues to drive the first abutting member 111 to move downward (toward the direction approaching the battery cell 2000), the connecting member 113 moves downward along with the first abutting member 111, so as to compress 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 abutting member 111 to provide a buffer for the abutting between the pressing member 112 and the bus bar.

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 in clearance fit with the first through hole 330 and the second through hole 1132, the diameter of the nut of the bolt is larger than that of the first through hole 330, so as to ensure that the nut of the bolt can be fixed to the mounting plate 300 in an abutting manner, the threaded portion of the bolt is threaded with the pressing member 112 after passing through the first through hole 330 and the second through hole 1132, the spring is sleeved on the threaded portion of the bolt, and two ends of the spring are respectively fixed to the connecting member 113 and the pressing member 112. The spring and the bolt have simple structure and convenient assembly.

To further enhance the structural strength of the compression assembly 110, a plurality of fasteners 114 are provided within each cushioning structure. The bottoms of the fixing pieces 114 are connected with the pressing piece 112 after penetrating through the mounting plate 300 from top to bottom, and each fixing piece 114 is correspondingly arranged with one elastic piece 115, so that the buffer effect of the elastic piece 115 on the pressing piece 112 can be improved while the connection strength between the pressing piece 112 and the connecting piece 113 is improved. It should be noted that, in the present embodiment, 4 fixing members 114 are disposed in the buffer structure, the bottoms of the four fixing members 114 are connected to the pressing 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 the fixing members 114 in the buffer structure may be adjusted according to actual requirements, which is not limited in this embodiment.

For the convenience of welding and fixing the bus bar abutted together and the tab of the battery cell 2000 by the subsequent welding equipment, as shown in fig. 3 to 6, a first avoidance port 1121 is formed in the pressing member 112, a second avoidance port 220 is formed in the movable pressing plate 200, a third avoidance port 310 is formed in the mounting plate 300, a fourth avoidance port 1131 is formed in the connecting member 113, the second avoidance port 220, the third avoidance port 310, the fourth avoidance port 1131 and the first avoidance port 1121 are mutually communicated, and the welding equipment can sequentially pass through the second avoidance port 220, the third avoidance port 310, the fourth avoidance port 1131 and the tab of the battery cell 2000 and then weld and fix the bus bar and the tab of the battery cell 2000. It should be noted that, in this embodiment, the welding device welds and fixes the busbar and the pole by using a welding manner of laser flying welding, and specific welding of the laser flying welding technology belongs to the prior art, and no description is repeated here. In other embodiments, the bus bar and the pole may be welded and fixed by other welding methods, which is not limited in this embodiment.

To improve the welding protection of the bus bars and the poles during welding, as shown in fig. 4 and 5, a gas flow passage 1122 is provided in the pressing member 112, and a shielding gas can be injected onto the bus bars along the gas flow passage 1122. By providing the gas flow channels 1122 for the shielding gas input in the pressing member 112, the shielding gas can be injected toward the busbar during the welding process of the busbar and the pole by the welding equipment, so that the oxidation of the busbar and the pole during the welding process is avoided. In this embodiment, the shielding gas is carbon dioxide, and in other embodiments, the shielding gas may be other inert gases, which is not particularly limited.

Further, an annular opening is disposed at an end of the pressing member 112 abutting against the bus bar, the annular opening is in communication with the gas flow passage 1122, and the shielding gas in the gas flow passage 1122 can be sprayed onto the bus bar along the annular opening. Through seting up annular opening at the one end that compresses tightly 112 and busbar butt, with the protection gas in the gas runner 1122 along annular opening injection on the busbar, guarantee that the protection gas can evenly spray in the welded area of busbar and utmost point post, further improve the welding protection to busbar and utmost point post.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

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

A mounting plate (300);

The plurality of groups of pressing mechanisms (100) are arranged at intervals along the length direction of the mounting plate (300) and are arranged on the mounting plate (300) in a lifting manner; and

The movable pressing plate (200) is positioned above the mounting plate (300) and can move along the length direction of the mounting plate (300), and at least two groups of adjacent pressing mechanisms (100) can be sequentially and simultaneously driven to move towards the direction close to the battery cell (2000) relative to the mounting plate (300) in the moving process of the movable pressing plate (200) so as to sequentially press the bus bar against the corresponding battery cell (2000).

2. The welding press as claimed in claim 1, wherein each set of press mechanisms (100) comprises:

And the compression ends of the compression assemblies (110) are opposite to the corresponding poles of the battery cells (2000), and the bus bars can be abutted between the compression ends of the compression assemblies (110) and the poles of the battery cells (2000).

3. The welding press as claimed in claim 2, wherein each press assembly (110) comprises:

a pressing member (112), the pressing member (112) being capable of pressing the bus bar against the corresponding pole; and

And the buffer structure can provide buffer for the abutting connection between the pressing piece (112) and the bus bar.

4. A welding hold-down device according to claim 3, wherein the cushioning structure comprises:

The fixing piece (114) is arranged in the mounting plate (300) in a penetrating mode and can slide along the vertical direction relative to the mounting plate (300), and the bottom of the fixing piece (114) is connected with the pressing piece (112);

The elastic piece (115) is sleeved outside the fixing piece (114), and two ends of the elastic piece (115) are respectively abutted against the mounting plate (300) and the pressing piece (112).

5. The welding pressing device according to claim 4, wherein the pressing member (112) is provided with a first avoiding opening (1121), the moving pressing plate (200) is provided with a second avoiding opening (220), and the mounting plate (300) is provided with a third avoiding opening (310);

The second avoidance port (220), the third avoidance port (310) and the first avoidance port (1121) are communicated with each other;

welding equipment can pass in proper order second dodge mouth (220) third dodge mouth (310) and first dodge behind mouth (1121) will the busbar with the utmost point post welded fastening of electric core (2000).

6. The welding press as claimed in claim 4, wherein a gas flow passage (1122) is provided in the press member (112), and a shielding gas can be sprayed onto the busbar along the gas flow passage (1122).

7. The welding press as claimed in claim 6, wherein an end of the press member (112) abutting against the busbar is provided with an annular opening, the annular opening being in communication with the gas flow passage (1122), the shielding gas in the gas flow passage (1122) being able to be sprayed on the busbar along the annular opening.

8. The welding press as claimed in claim 4, wherein a plurality of said fixtures (114) are provided in each of said buffer structures.

9. Welding press according to claim 1, characterized in that each set of press mechanism (100) is provided with a first abutment (111), the moving press plate (200) is provided with a second abutment (210), the second abutment (210) being able to abut against the first abutment (111) and drive the first abutment (111) to move towards the direction close to the cell (2000).

10. The welding pressing device according to claim 9, wherein the first abutting member (111) is a roller, both ends of the second abutting member (210) along the length direction of the mounting plate (300) are provided with inclined surfaces, the two inclined surfaces are drawn close to each other while extending outwards relative to the movable pressing plate (200), and the inclined surfaces can abut against the roller and provide guidance for movement of the roller in a direction approaching the battery cell (2000).