Welding device and battery production system

Abstract

The application relates to a welding device and a battery production system, which comprises a welding assembly, a shaping assembly and a rolling assembly. The welding assembly comprises a welding head and a pressing piece. The pressing piece is arranged on the welding head and can abut against a to-be-welded piece in a first direction; the shaping assembly is connected to the welding head and is arranged at a distance from the pressing piece in a second direction, and the second direction is arranged at an angle to the first direction; the shaping assembly comprises a floating shaping block and a telescopic piece. The telescopic piece is connected to the floating shaping block and can drive the floating shaping block to float up and down in the first direction according to the telescopic property of the telescopic piece; the rolling assembly is arranged on one side of the pressing piece in the second direction and is installed at one end of the shaping assembly facing the to-be-welded piece; the rolling assembly can rotate around a preset axis. When the tabs of a battery monomer are welded, the total length of the tabs that can be stretched and deformed during the welding process can be increased, the deformation amount borne by the tabs in a unit area is reduced, and finally the possibility of cracking of the tabs is reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to welding equipment and battery production systems. Background Technology

[0002] In the manufacturing process of a battery cell, multiple layers of tabs need to be welded together to facilitate subsequent electrical connection with the electrode terminals on the casing, thereby ultimately achieving the processing and assembly of the battery cell. However, during the welding process, due to the thinness of a single tab layer and the large number of tab layers to be welded, the tabs are prone to excessive stretching and deformation during friction with the welding head, leading to cracking. This weakens the current carrying capacity of the tabs, reduces the charge and discharge capacity of the battery cell, and ultimately reduces the reliability of the battery cell. Utility Model Content

[0003] In view of the above problems, this application provides a welding device and a battery production system that can reduce the cracking of the tabs during the welding process, effectively ensuring the current carrying capacity of the tabs and the charge and discharge capacity of the battery cells.

[0004] In a first aspect, this application provides a welding apparatus, comprising a welding assembly, a shaping assembly, and a rolling assembly. The welding assembly includes a welding head and a pressure-applying member. The pressure-applying member is disposed on the welding head and is capable of abutting against the workpiece to be welded along a first direction. The shaping assembly is connected to the welding head and is spaced apart from the pressure-applying member along a second direction, the second direction being at an angle to the first direction. The shaping assembly includes a floating shaping block and a telescopic member. The telescopic member is connected to the floating shaping block and is capable of driving the floating shaping block to float up and down along the first direction according to its own telescopicity. The rolling assembly is disposed along the second direction on one side of the pressure-applying member and installed on the end of the shaping assembly facing the workpiece to be welded; the rolling assembly is capable of rotating around a preset axis.

[0005] The welding apparatus provided in this application embodiment, when welding the tabs of a battery cell, involves a pressure member moving along a first direction. The tab located below the pressure member undergoes tensile deformation during the vibration and pressing of the pressure member, thus achieving welding. During the welding process, a shaping component connected to the welding head is provided on the outer periphery of the pressure member along a second direction. A rolling component is mounted on the shaping component. Since the rolling component can rotate around a preset axis and roll against the surface tab, the shaping component and the surface tab roll against each other during welding. This results in rolling friction between the shaping component and the surface tab, leading to lower frictional force. Furthermore, the tab between the rolling component and the pressure member also possesses a certain degree of free deformation capability during the welding process. This design allows the tab located below the pressure-applying component to transfer a portion of the tensile deformation during the stretching process to the tab between the rolling assembly and the pressure-applying component. This increases the total length of the tab that can undergo tensile deformation during welding, effectively reducing the amount of deformation per unit area and thus lowering the possibility of cracking during welding. This effectively ensures the current-carrying capacity of the tab and the charge / discharge capacity of the battery cell, ultimately resulting in higher reliability of the battery cell. Furthermore, during the tab welding process, a shaping assembly connected to the welding head is located on the outer periphery of the pressure-applying component. This shaping assembly includes a floating shaping block and a retractable component. The floating shaping block can float up and down in the first direction and roll against the surface tab through the rolling assembly. During welding, the shaping assembly moves synchronously with the welding head, and the tab between the shaping assembly and the pressure-applying component also has a certain degree of free deformation capability during welding. This allows the tab located below the pressure-applying component to transfer a portion of the tensile deformation to the tab between the shaping component and the pressure-applying component during the tensile deformation process. This increases the total length of the tab that can undergo tensile deformation during welding, thereby effectively reducing the amount of deformation borne by the tab per unit area. This reduces the possibility of the tab cracking during welding, effectively ensuring the current carrying capacity of the tab and the charging and discharging capacity of the battery cell, ultimately resulting in higher reliability of the battery cell.

[0006] In some embodiments, the rolling assembly includes a first rolling group; the first rolling group is disposed on the side of the floating shaping block opposite to the telescopic member. By installing the first rolling group on the side of the floating shaping block opposite to the telescopic member, when the floating shaping block floats up and down along a first direction during the welding process, the first rolling group can float up and down along the first direction under the drive of the floating shaping block and can abut against the surface electrode tab, thereby enabling the floating shaping block to achieve a rolling connection with the surface electrode tab through the first rolling group, reducing the friction between the shaping assembly and the surface electrode tab.

[0007] In some embodiments, the first rolling group is disposed at the edge of the floating shaping block near the pressure member along the second direction. By disposing the first rolling group at the edge of the floating shaping block near the pressure member along the second direction, the first rolling group can be closer to the welding area of ​​the tab. When the pressure member moves along the first direction, the first rolling group can roll and abut against the area of ​​the surface tab near the welding area under the floating action of the floating shaping block, thereby floating and shaping the deformation of the tab in that area. Since the floating and shaping area is close to the welding area with a large deformation, the possibility of cracking caused by excessive deformation per unit area during the welding process of the tab can be reduced.

[0008] In some embodiments, the dimension of the rolling portion in the first rolling group along the third direction is smaller than the dimension of the floating shaping block along the third direction; and the dimension of the rolling portion in the first rolling group along the third direction is larger than the dimension of the workpiece to be welded along the third direction; the third direction, the first direction, and the second direction intersect each other in pairs.

[0009] By setting the size of the rolling portion in the first rolling group along the third direction to be smaller than the size of the floating shaping block along the third direction, the size of the floating shaping block is made larger, which allows it to better contact the lower tab and thus perform the floating shaping function.

[0010] By setting the dimension of the rolling part in the first rolling group along the third direction to be larger than the dimension of the workpiece to be welded along the third direction, the rolling part can have a larger contact surface with the electrode in the third direction during the welding process. As a result, when the floating shaping block floats up and down to float and shape the electrode during the welding process, the force exerted on the electrode by the rolling part in the third direction has a larger contact area and less rolling friction, making it easier to increase the total length of the electrode that can undergo tensile deformation during the welding process.

[0011] By setting the dimension of the floating shaping block along the third direction to be greater than or equal to the dimension of the part to be welded along the third direction, when the electrode tabs to be welded are the electrode tabs of a wound battery cell, the floating shaping block can still cover all the electrode tabs well, even under the extreme misalignment between the electrode tab layers of the wound battery cell, thus ensuring a good shaping effect during the welding process.

[0012] In some embodiments, a first plane is formed on the side of the floating shaping block away from the telescopic member; the first plane is inclined upward from the side near the pressure member toward the side away from the pressure member, so as to be able to contact the area of ​​thickness variation in the workpiece to be welded.

[0013] Since the tabs need to be bent and smoothed after extending from the battery cell assembly before welding, the floating shaping block must be adapted to the bent shape of the tab when it floats against it to reduce the pressure per unit area of ​​the tab. When the tab is in the welding machine, the floating shaping block moves up and down, and the inclined first plane can achieve better conformal adaptation with the area of ​​thickness variation of the tab. At the same time, combined with the rolling friction effect achieved by the rolling part of the first rolling group against the tab, the tensile constraint of the floating shaping block on the tab during welding is greatly reduced, ensuring effective shaping of the tab, significantly reducing surface tab tensile damage during welding, and thus greatly improving the possibility of tab welding cracks.

[0014] In some embodiments, the dimension d1 of the orthographic projection of the first plane along the first direction along the second direction satisfies the condition: 1mm ≤ d1 ≤ 5mm. By setting the dimension d1 of the orthographic projection of the first plane along the first direction along the second direction to be greater than or equal to 1mm and less than or equal to 5mm, the dimension d1 of the orthographic projection of the first plane along the first direction along the second direction is more suitable. This effectively ensures the contact area between the first plane and the tab cluster formed by the appropriate number of tab layers. Consequently, the floating shaping area of ​​the tab during the welding process is more suitable, and the floating shaping block has a better floating shaping effect on the tab. This can reduce the possibility of excessive stretching of the surface tab during the welding process, which may lead to friction cracking. It can also reduce the need for excessively long tabs, thus reducing the possibility of unnecessary cost increases for the battery cell.

[0015] In some embodiments, the surface roughness of the first plane is less than or equal to 0.025 μm. By setting the surface roughness of the first plane to less than or equal to 0.025 μm, the first plane achieves a mirror-like bevel effect, effectively reducing the coefficient of friction between the first plane and the surface tab under high-frequency vibration during welding. This results in low-friction, high-quality welding, avoiding excessive stretching of the surface tab during welding and significantly improving weld quality reliability. Simultaneously, during the high-frequency vibration welding process, the floating shaping block effectively performs local longitudinal displacement, further reducing frictional and tensile damage to the surface tab and thus improving tab cracking.

[0016] In some embodiments, the first rolling group is disposed on the outer periphery of the edge of the first plane near the pressure member. By disposing the first rolling group on the outer periphery of the edge of the first plane near the pressure member, the first rolling group can be closer to the welding area of ​​the tab. When the pressure member moves along the first direction, the first rolling group can roll and abut against the area of ​​the surface tab near the welding area under the floating action of the floating shaping block, thereby floating and shaping the deformation of the tab in that area. Since the floating and shaping area is close to the welding area with a large deformation, the possibility of cracking caused by excessive deformation per unit area during the welding process of the tab can be reduced.

[0017] In some embodiments, the floating shaping block has a pre-welding state and a floating shaping state relative to the workpiece to be welded; in the pre-welding state, the floating shaping block can abut against the workpiece to be welded; in the floating shaping state, the floating shaping block can switch back and forth between abutting and separating states relative to the workpiece to be welded along a first direction.

[0018] In the pre-welding state, the floating shaping block can abut against the tab to be welded, thus creating a tab of a certain size between the floating shaping block and the pressure-applying component. In the floating shaping state, the floating shaping block can switch back and forth between the abutment and separation states along the first direction relative to the tab to be welded, thereby enabling the floating shaping block to effectively perform local longitudinal displacement, thereby reducing frictional and tensile damage to the surface tab caused by the pressure-applying component and improving tab cracking.

[0019] In some embodiments, the shaping assembly further includes a fixed shaping plate connected to the welding head, the fixed shaping plate being disposed between the pressure-applying member and the floating shaping block and spaced apart from each other. By providing the fixed shaping plate, and by disposing of the fixed shaping plate between the pressure-applying member and the floating shaping block and spaced apart from each other, the fixed shaping plate can intermittently abut against the surface electrode tab when the floating shaping block floats up and down to perform floating shaping on the electrode tab, so as to perform contact vibration damping on the electrode tab and prevent excessive deformation of the electrode tab.

[0020] In some embodiments, the distance d2 between the fixed shaping plate and the floating shaping block along the second direction satisfies the condition: 0.02mm ≤ d2 ≤ 0.05mm. By setting the distance d2 between the fixed shaping plate and the floating shaping block along the second direction to a range greater than or equal to 0.02mm and less than or equal to 0.05mm, the distance between the fixed shaping plate and the floating shaping block can be smaller, thereby enabling the fixed shaping plate to have a better vibration damping effect on the tab.

[0021] In some embodiments, a fixing shaping surface is formed at the end of the fixing shaping plate near the workpiece to be welded, and the fixing shaping surface includes at least a partially arcuate structure. By setting the fixing shaping surface to include at least a partially arcuate structure, the contact surface between the fixing shaping surface and the electrode tab is relatively smooth when they come into contact during vibration damping, making it less likely for the fixing shaping surface to puncture or cut the electrode tab, thus reducing the possibility of the electrode tab cracking.

[0022] In some embodiments, in the pre-welding state, the floating shaping block abuts against the workpiece to be welded, and the fixed shaping surface separates from the workpiece to be welded.

[0023] When in the pre-welding state, that is, before welding, the floating shaping block abuts against the tab, and the fixed shaping surface is separated from the tab. This allows a portion of the tab to be left between the floating shaping block and the pressure-applying component. During the tensile deformation process, the tab located below the pressure-applying component can transfer a portion of the tensile deformation to the tab between the floating shaping block and the pressure-applying component. This increases the total length of the tab that can undergo tensile deformation during welding, thereby effectively reducing the amount of deformation borne by the tab per unit area. This reduces the possibility of the tab cracking during welding, effectively ensuring the current carrying capacity of the tab and the charge and discharge capacity of the battery cell, ultimately resulting in higher reliability of the battery cell.

[0024] In some embodiments, in the pre-welding state, along the first direction, the rolling portion of the first rolling group has a gap between its contact surface with the workpiece to be welded and the fixed shaping surface. By providing a gap along the first direction between the rolling portion of the first rolling group and the contact surface of the tab, and between the fixed shaping surface, in the pre-welding state, the rolling portion of the first rolling group can contact the surface tab, while the fixed shaping surface is separated from the surface tab. This allows a portion of the tab to remain between the rolling portion of the first rolling group and the pressure-applying member, thereby increasing the total length of the tab that can undergo tensile deformation during the welding process.

[0025] In some embodiments, in the pre-welding state, along the first direction, the minimum distance d3 between the rolling portion in the first rolling group and the lowest contact surface of the workpiece to be welded and the fixed shaping surface satisfies the condition: 0.5mm≤d3≤1mm.

[0026] By setting the minimum spacing d3 to a range greater than or equal to 0.5 mm and less than or equal to 1 mm, the minimum spacing between the rolling part in the first rolling group and the lowest contact surface of the workpiece to be welded, and between the rolling part and the fixed shaping surface, becomes more suitable. When the floating shaping block moves up and down, the electrode tab can move up and down within a suitable range under the vibration damping and movement constraints of the fixed shaping block. This ensures that the floating range of the electrode tab is not too small, resulting in a weak floating shaping effect, nor too large, affecting the welding effect.

[0027] In some embodiments, the rolling assembly includes a second rolling group; the second rolling group is disposed on the side of the fixed shaping plate near the workpiece to be welded.

[0028] By setting a second rolling group on the side of the fixed shaping plate close to the workpiece to be welded, the fixed shaping plate and the surface tab can be abutted by the second rolling group, thereby forming rolling friction between the two. The friction force is small, which greatly reduces the tensile damage of the surface tab during the welding process, and thus greatly improves the possibility of tab welding cracking.

[0029] In some embodiments, in the pre-welding state, the first rolling group abuts against the workpiece to be welded, and the second rolling group separates from the workpiece to be welded. By providing the second rolling group on the side of the fixed shaping plate close to the workpiece to be welded, the fixed shaping plate and the surface tab can abut against each other through the second rolling group, thereby forming rolling friction between them. The friction force is small, which greatly reduces the tensile damage of the surface tab during the welding process, and thus greatly improves the possibility of tab welding cracking.

[0030] By setting a first rolling group on the side of the floating shaping block closest to the workpiece to be welded, and setting a second rolling group on the side of the fixed shaping plate closest to the workpiece to be welded, the floating shaping block achieves intermittent contact with the surface tab through the first rolling group, and the two engage in rolling friction during contact. Meanwhile, the fixed shaping plate achieves intermittent contact with the surface tab through the second rolling group, and the two engage in rolling friction during contact. This reduces the shaping friction force on the surface tab, significantly mitigating tensile damage to the surface tab during welding, and thus greatly reducing the possibility of tab welding cracking.

[0031] In some embodiments, in the pre-welding state, along the first direction, the minimum distance d4 between the rolling portion in the first rolling group and the lowest contact surface of the workpiece to be welded, and the second rolling group, satisfies the condition: 0.5mm≤d4≤1mm.

[0032] By setting the minimum spacing d4 to a range greater than or equal to 0.5 mm and less than or equal to 1 mm, the minimum spacing between the rolling part in the first rolling group and the lowest contact surface of the workpiece to be welded, and the minimum spacing between the second rolling group and the workpiece to be welded, is appropriately suitable. When the floating shaping block moves up and down, the electrode tab can move up and down within a suitable range under the vibration damping and movement constraints of the fixed shaping block. This avoids making the electrode tab's floating range too small, resulting in a weak floating shaping effect, or making the electrode tab's floating range too large, affecting the welding effect.

[0033] In some embodiments, the shaping assembly further includes a fixed shaping plate connected to the welding head, the fixed shaping plate being disposed between the pressure member and the floating shaping block and spaced apart from each other; the rolling assembly includes a second rolling group, the second rolling group being disposed on the side of the fixed shaping plate close to the workpiece to be welded; the floating shaping block having a pre-welding state relative to the workpiece to be welded, in the pre-welding state, the floating shaping block abutting against the workpiece to be welded, and the second rolling group separating from the workpiece to be welded.

[0034] By setting a fixed shaping plate, which is positioned between the pressure-applying component and the floating shaping block and spaced apart from each other, the fixed shaping plate can intermittently contact the surface electrode tab when the floating shaping block moves up and down to perform floating shaping on the electrode tab, thereby contacting and damping the electrode tab and preventing excessive deformation of the electrode tab.

[0035] By setting a second rolling group on the side of the fixed shaping plate close to the workpiece to be welded, the fixed shaping plate and the surface tab can be abutted by the second rolling group, thereby forming rolling friction between the two. The friction force is small, which greatly reduces the tensile damage of the surface tab during the welding process, and thus greatly improves the possibility of tab welding cracking.

[0036] In some embodiments, in the pre-welding state, along the first direction, the minimum abutment surface of the floating shaping block and the workpiece to be welded and the minimum distance d5 between the second rolling group satisfy the condition: 0.5mm≤d5≤1mm.

[0037] By setting the minimum spacing d5 to a range greater than or equal to 0.5 mm and less than or equal to 1 mm, the minimum distance between the lowest contact surface of the floating shaping block and the workpiece to be welded, and the minimum distance between the second rolling group, is appropriately suitable. When the floating shaping block floats up and down, the electrode tab can float within a suitable range under the vibration damping and movement constraints of the fixed shaping block. This avoids making the electrode tab's floating range too small, resulting in a weak floating shaping effect, or making the electrode tab's floating range too large, affecting the welding effect.

[0038] In some embodiments, the rolling assembly includes a shaft and rolling elements. The shaft extends along a third direction and is mounted on the shaping assembly, with the third direction, the first direction, and the second direction intersecting each other in pairs; the rolling elements are sleeved on the shaft and are rotatable relative to the axis of the shaft.

[0039] During the electrode welding process, when the floating shaping block is in a floating shaping state relative to the workpiece to be welded, the rolling element can intermittently abut against the surface electrode. At the same time, the rolling element rotates around the axis, so that the rolling element and the surface electrode are in rolling friction contact, and the friction between the two is small.

[0040] In some embodiments, the scrolling components include multiple sets; the multiple sets of scrolling components are spaced apart along a second direction and / or a third direction.

[0041] By setting multiple sets of rolling components, and spacing these multiple sets of rolling components along a second direction and / or a third direction, it becomes possible to achieve rolling contact with multiple areas of the surface tab through these multiple sets of rolling components.

[0042] In some embodiments, the welding head is configured with a clearance through-hole extending along a first direction; the pressure member extends from the clearance through-hole.

[0043] By providing a clearance through hole on the welding head and allowing the welding head with the pressure-applying component to extend out of the clearance through hole, the driving component can control the welding head to move up and down in the first direction when controlling the distance between the pressure-applying component and the workpiece to be welded, which is more convenient.

[0044] In some embodiments, the pressure-applying component is an ultrasonic welding tooth assembly. The ultrasonic welding tooth assembly includes multiple welding teeth arranged laterally and vertically. The ultrasonic welding tooth assembly transmits ultrasonic energy to the surface of the workpiece to be welded, and frictional heat is generated between the workpiece and the workpiece, causing the workpiece to melt and eventually cool and solidify to join together.

[0045] Secondly, this application also provides a battery production system, which includes the welding apparatus described in any of the above embodiments. When the battery production system provided in this application is used to weld the tabs of a battery cell, the pressure member moves along a first direction, and the tab located below the pressure member can undergo tensile deformation and welding during the vibration and pressing of the pressure member. During the welding process, a shaping component connected to the welding head is provided on the outer periphery of the pressure member along a second direction, and a rolling component is mounted on the shaping component. Since the rolling component can rotate around a preset axis and can roll against the surface tab, the shaping component and the surface tab roll against each other during the welding process. This results in rolling friction between the shaping component and the surface tab, with relatively low frictional force. Furthermore, the tab between the rolling component and the pressure member can also have a certain degree of free deformation capability during the welding process. This design allows the tab located below the pressure-applying component to transfer a portion of the tensile deformation during the stretching process to the tab between the rolling assembly and the pressure-applying component. This increases the total length of the tab that can undergo tensile deformation during welding, effectively reducing the amount of deformation per unit area and thus lowering the possibility of cracking during welding. This effectively ensures the current-carrying capacity of the tab and the charge / discharge capacity of the battery cell, ultimately resulting in higher reliability of the battery cell. Furthermore, during the tab welding process, a shaping assembly connected to the welding head is located on the outer periphery of the pressure-applying component. This shaping assembly includes a floating shaping block and a retractable component. The floating shaping block can float up and down in the first direction and roll against the surface tab through the rolling assembly. During welding, the shaping assembly moves synchronously with the welding head, and the tab between the shaping assembly and the pressure-applying component also has a certain degree of free deformation capability during welding. This allows the tab located below the pressure-applying component to transfer a portion of the tensile deformation to the tab between the shaping component and the pressure-applying component during the tensile deformation process. This increases the total length of the tab that can undergo tensile deformation during welding, thereby effectively reducing the amount of deformation borne by the tab per unit area. This reduces the possibility of the tab cracking during welding, effectively ensuring the current carrying capacity of the tab and the charging and discharging capacity of the battery cell, ultimately resulting in higher reliability of the battery cell.

[0046] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0048] Figure 1 A schematic diagram of an electrical device provided for some embodiments of this application.

[0049] Figure 2 for Figure 1 A schematic diagram of the battery device shown.

[0050] Figure 3 for Figure 2 A schematic diagram of a single battery cell is shown.

[0051] Figure 4 This is a schematic diagram of a welding apparatus provided in some embodiments of this application welding a single battery cell.

[0052] Figure 5 for Figure 4 A schematic diagram of the welding apparatus shown.

[0053] Figure 6 for Figure 5 A magnified view of a portion at point A shown.

[0054] Figure 7 The welding apparatus provided for other embodiments of this application is in Figure 5 A magnified view of a portion at point A shown.

[0055] Figure 8 The welding apparatus provided in some embodiments of this application is in Figure 5 A magnified view of a portion at point A shown.

[0056] Figure 9 for Figure 6 The diagram shows a top view of a portion of the structure of the welding device used to weld battery cells.

[0057] The reference numerals in the detailed embodiments are as follows:

[0058] 1000 - Vehicles;

[0059] 1100 - Battery assembly; 1110 - Housing; 1111 - First part; 1112 - Second part; 1120 - Individual battery cell; 1121 - End cap; 1121a - Electrode terminal; 1122 - Housing; 1123 - Cell assembly; 11231 - Cell body; 11232 - Tab; 11233 - Solder mark;

[0060] 1200-Controller;

[0061] 1300-motor;

[0062] 2000 - Welding equipment;

[0063] 100 - Welding assembly;

[0064] 110 - Welding head; 111 - Welding mating surface; 112 - Clearance through hole; 120 - Pressure application component;

[0065] 200-Shaping Components;

[0066] 210 - Floating shaping block; 211 - First plane; 220 - Telescopic component; 230 - Fixed shaping plate; 231 - Fixed shaping surface;

[0067] 300 - Scrolling component; 300a - First scrolling group; 300b - Second scrolling group;

[0068] 310 - Shaft; 320 - Rolling element;

[0069] 400-Driver. Detailed Implementation

[0070] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0073] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0075] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0076] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars. As the application areas of power batteries continue to expand, the market demand for them is also constantly increasing.

[0079] In the manufacturing process of power battery cells, multiple layers of tabs need to be welded together to facilitate subsequent electrical connection with the electrode terminals on the casing, thereby ultimately achieving the processing and assembly of the battery cell. However, during the welding process, due to the thinness of a single tab layer and the large number of tab layers to be welded, the tabs are prone to excessive stretching and deformation during friction with the welding head, leading to cracking. This weakens the current carrying capacity of the tabs, reduces the charge and discharge capacity of the battery cell, and ultimately reduces the reliability of the battery cell.

[0080] Based on the above considerations, in order to reduce the possibility of cracking due to excessive stretching deformation of the tab during the friction with the welding head, this application provides a welding device that increases the total length of the tab that can undergo stretching deformation during the welding process, thereby reducing the possibility of cracking of the tab during the welding process, and thus effectively ensuring the overcurrent capacity of the tab and the charge and discharge capacity of the battery cell, ultimately resulting in higher reliability of the battery cell.

[0081] The power battery ultimately formed by the battery cells welded using the welding apparatus disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0082] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0083] Please refer to Figure 1 , Figure 1 The diagram illustrates an electrical device provided in some embodiments of this application. The electrical device can be a vehicle 1000, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 1100 is installed inside the vehicle 1000, and the battery device 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1100 can be used to power the vehicle 1000; for example, the battery device 1100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 controls the battery device 1100 to supply power to the motor 1300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0084] In some embodiments of this application, the battery device 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0085] Please refer to Figure 2 , Figure 2 It shows Figure 1 The diagram shows a schematic of a battery device 1100. The battery device 1100 includes a housing 1110 and a battery cell 1120, with the battery cell 1120 housed within the housing 1110. The housing 1110 provides a space for the battery cell 1120, and the housing 1110 can have various structures. In some embodiments, the housing 1110 may include a first portion 1111 and a second portion 1112, which overlap each other, and together define a space for accommodating the battery cell 1120. The second part 1112 can be a hollow structure with one end open, and the first part 1111 can be a plate-like structure. The first part 1111 covers the open side of the second part 1112 so that the first part 1111 and the second part 1112 together define the accommodating space. Alternatively, the first part 1111 and the second part 1112 can both be hollow structures with one side open, and the open side of the first part 1111 covers the open side of the second part 1112. Of course, the box 1110 formed by the first part 1111 and the second part 1112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0086] In the battery device 1100, there can be multiple battery cells 1120. These multiple battery cells 1120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cells 1120 are connected in both series and parallel. The multiple battery cells 1120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 1120 is housed within the housing 1110. Alternatively, the battery device 1100 can also consist of multiple battery cells 1120 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 1110. The battery device 1100 may also include other structures; for example, the battery device 1100 may also include a busbar component for realizing the electrical connection between the multiple battery cells 1120.

[0087] Each battery cell 1120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 1120 can be cylindrical, flat, cuboid, or other shapes.

[0088] Please see Figure 3 , Figure 3 It shows Figure 2 The diagram shows a single battery cell 1120. The single battery cell 1120 refers to the smallest unit that makes up a battery. Figure 3The battery cell 1120 includes an end cap 1121, a housing 1122, a cell assembly 1123, and other functional components.

[0089] End cap 1121 refers to a component that covers the opening of housing 1122 to isolate the internal environment of battery cell 1120 from the external environment. The shape of end cap 1121 can be adapted to the shape of housing 1122 to fit it. Optionally, end cap 1121 can be made of a material with a certain hardness and strength, so that end cap 1121 is not easily deformed under pressure or impact, allowing battery cell 1120 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 1121a can be provided on end cap 1121. Electrode terminals 1121a can be used for electrical connection with cell assembly 1123 to output or input electrical energy from battery cell 1120. In some embodiments, end cap 1121 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 1120 reaches a threshold. The end cap 1121 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating structure may also be provided on the inner side of the end cap 1121. The insulating structure can be used to isolate the electrical connection components inside the housing 1122 from the end cap 1121 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0090] The housing 1122 is a component used to cooperate with the end cap 1121 to form the internal environment of the battery cell 1120. This internal environment can accommodate the cell assembly 1123, electrolyte, and other components. The housing 1122 and the end cap 1121 can be independent components. An opening can be provided on the housing 1122, and the end cap 1121 can be used to close the opening to form the internal environment of the battery cell 1120. Alternatively, the end cap 1121 and the housing 1122 can be integrated. Specifically, the end cap 1121 and the housing 1122 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 1122, the end cap 1121 closes the housing 1122. The housing 1122 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 1122 can be determined according to the specific shape and size of the cell assembly 1123. The shell 1122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0091] The cell assembly 1123 is the component in the battery cell 1120 where the electrochemical reaction occurs. The casing 1122 may contain one or more cell assemblies 1123. The cell assembly 1123 is mainly formed by thermally bonding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive and negative electrode sheets to form a composite strip, and then stacking the composite strip. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly 1123, while the portions of the positive and negative electrode sheets without active material each constitute a tab 11232. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 11232 connect to the electrode terminals 1121a to form a current circuit.

[0092] Please see Figures 4-8 , Figure 4 A schematic diagram is shown of the welding apparatus 2000 provided in some embodiments of this application welding a battery cell 1120. Figure 5 It shows Figure 4 A schematic diagram of the welding apparatus 2000 shown. Figure 6 It shows Figure 5 A magnified view of a portion at point A shown. Figure 7 The welding apparatus 2000 provided in other embodiments of this application is shown in... Figure 5 A magnified view of a portion at point A shown. Figure 8 The welding apparatus 2000 provided in some other embodiments of this application is shown in... Figure 5 A magnified view of a portion at point A shown.

[0093] This application provides a welding apparatus 2000 according to some embodiments, which includes a welding assembly 100, a shaping assembly 200, and a rolling assembly 300. The welding assembly 100 includes a welding head 110 and a pressure applying member 120. The pressure applying member 120 is disposed on the welding head 110 and is capable of abutting against the workpiece to be welded along a first direction; exemplarily, the first direction may be the thickness direction of the welding area of ​​the workpiece to be welded, exemplarily, the first direction may be... Figures 4-8 In the zz' direction, the shaping component 200 is connected to the welding head 110 and is spaced apart from the pressure member 120 along the second direction, which is angled to the first direction; for example, the second direction can be Figures 4-8 The xx' direction in the first direction. The shaping component 200 includes a floating shaping block 210 and a retractable member 220. The retractable member 220 is connected to the floating shaping block 210 and can drive the floating shaping block 210 to float up and down along the first direction according to its own retractability.

[0094] The rolling assembly 300 is disposed on one side of the pressure member 120 along the second direction and installed on the end of the shaping assembly 200 facing the workpiece to be welded; the rolling assembly 300 is capable of rotating around a preset axis.

[0095] The second direction can be perpendicular to the first direction, meaning the angle between the second direction and the first direction is 90°. Of course, in other embodiments, the second direction can also be any value of 88°, 85°, 80°, 75° or greater than 0° and less than or equal to 90° with the first direction, without any special limitation.

[0096] Both the second direction and the first direction can be located at... Figures 4-8 The plane shown is parallel to the xx'zz' plane.

[0097] The welding head 110 can be made of high-strength gray cast iron or other materials that are not easily deformed, which makes the structure of the welding head 110 more stable and the movement control precision of the pressure member 120 more precise when controlling the movement of the welding pressure member 120.

[0098] The high-frequency vibration applied by the welding head 110 to the workpiece to be welded can be in any direction, without any particular limitation. In some embodiments, the welding head 110 can be along... Figure 4 The longitudinally extending direct-pressure structure in the zz' direction allows the welding head 110 to vibrate up and down along the first direction, thereby subjecting the workpiece to high-frequency vibration waves along the first direction and generating frictional heat to achieve a welding connection. In some embodiments, the welding head 110 may also be a longitudinally extending direct-pressure structure in the zz' direction. Figure 4 The cantilever beam structure extending in the xx' direction allows the welding head 110 to vibrate laterally along the second direction, thereby causing the workpiece to be welded to be subjected to high-frequency vibration waves along the second direction and generate frictional heat to achieve a welding connection.

[0099] In some embodiments, the welding apparatus 2000 further includes a welding base, which is disposed opposite to the welding head 110. The workpiece to be welded is disposed above the welding base, and the welding base serves to longitudinally support the workpiece to be welded.

[0100] The pressure-applying component 120 can be an ultrasonic welding tooth assembly, which includes multiple welding teeth spaced apart from each other. When the welding tooth assembly vibrates at high frequency under the drive of the drive component 400, it can apply a vertically downward force in the longitudinal direction, thereby transmitting the high-frequency vibration mechanical energy on the welding teeth to the welding surface of the workpiece to be welded, thereby driving the high-frequency displacement of the workpiece to be welded. The welding surface melts due to frictional heat generation and finally cools and solidifies together.

[0101] The shaping component 200 may include a fixed structure and / or a floating structure. Since it is spaced apart from the pressure member 120 along the second direction, a portion of the tab 11232 may remain between the shaping component 200 and the pressure member 120 during the welding process. This allows the tab 11232 to bear a portion of the tensile deformation during the subsequent welding process, thereby increasing the total length of the tab 11232 that can undergo tensile deformation during the welding process.

[0102] The floating shaping block 210 can have its own elastic deformation capability, thereby enabling the floating shaping block 210 to move along the first direction. The floating shaping block 210 can also achieve movement along the first direction by means of the stretchable deformation capability of the telescopic member 220, without any special limitation.

[0103] The expandable component 220 can be an elastic component with its own elastic deformation capability, such as a spring or elastic washer. It can expand and contract along the first direction through its own elastic deformation capability, thereby changing its size along the first direction.

[0104] In some embodiments, the telescopic member 220 is a spring, and the diameter of the spring can be greater than or equal to 1 mm and less than or equal to 5 mm. In some embodiments, the telescopic member 220 is a spring, and the diameter of the spring can be greater than or equal to 2 mm and less than or equal to 3 mm.

[0105] In some embodiments, the telescopic member 220 is a spring with a stiffness greater than or equal to 10 N / mm and less than or equal to 30 N / mm. By setting the stiffness of the telescopic member 220 to a range greater than or equal to 10 N / mm and less than or equal to 30 N / mm, the stiffness range of the telescopic member 220 is made more suitable. This allows for better up-and-down floating frequency and amplitude of the fixed shaping block, resulting in a better floating shaping effect on the tab 11232. It also reduces the excessive consumption of welding energy by the fixed shaping block during the welding process.

[0106] By connecting the retractable component 220 to the floating shaping block 210, the retractable component 220 can drive the floating shaping block 210 to float up and down along the first direction, which is relatively simple.

[0107] The rolling assembly 300 may include a rotating shaft 310 and a rolling element 320. The rotating shaft 310 is mounted on the end of the forming assembly 200 facing the workpiece to be welded, and the rolling element 320 is mounted on the rotating shaft 310 and can rotate relative to the rotating shaft 310. The rolling element 320 may be a rolling ball and / or a rolling column, etc., and there is no special limitation, as long as it can rotate around a preset axis and roll against the workpiece to be welded.

[0108] The component to be welded can be the tab 11232 of the battery cell 1120, thereby welding the multiple layers of tabs 11232 of the battery cell 1120 together to facilitate subsequent electrical connection with the electrode terminals 1121a on the housing 1122. Of course, the component to be welded can also be other structures, and there is no special limitation on this. For example, the battery cell 1120 has 72 layers of tabs 11232, and these 72 layers of tabs 11232 need to be welded together. During the welding process, the tab 11232 that is closest to and abuts against the pressure applying member 120 is called the surface tab 11232. The following example uses the tab 11232 as the component to be welded.

[0109] The welding apparatus 2000 provided in this application embodiment, when welding the tabs 11232 of a battery cell 1120, involves a pressure member 120 moving along a first direction. The tabs 11232 located below the pressure member 120 undergo tensile deformation during the vibration and pressing of the pressure member 120, thus achieving welding. During the welding process, a shaping component 200 connected to a welding head 110 is provided on the outer periphery of the pressure member 120 along a second direction. A rolling component 300 is mounted on the shaping component 200. Since the rolling component 300 can rotate around a preset axis and roll against the surface tabs 11232, the shaping component 200 and the surface tabs 11232 roll against each other during welding. This results in rolling friction between the shaping component 200 and the surface tabs 11232, with relatively low frictional force. Furthermore, the tabs 11232 between the rolling component 300 and the pressure member 120 also possess a certain degree of free deformation capability during the welding process. This allows the tab 11232 located below the pressure member 120 to transfer a portion of the tensile deformation during the tensile deformation process to the tab 11232 between the rolling assembly 300 and the pressure member 120. This increases the total length of the tab 11232 that can undergo tensile deformation during welding, thereby effectively reducing the amount of deformation borne by the tab 11232 per unit area. This reduces the possibility of cracking of the tab 11232 during welding, effectively ensuring the current carrying capacity of the tab 11232 and the charging and discharging capacity of the battery cell 1120, ultimately resulting in higher reliability of the battery cell 1120. Furthermore, during the welding process of the tab 11232, a shaping assembly 200 connected to the welding head 110 is provided on the outer periphery of the pressure member 120. The shaping assembly 200 includes a floating shaping block 210 and a retractable assembly. Therefore, the floating shaping block 210 can float up and down along the first direction and roll against the surface tab 11232 through the rolling assembly 300. During the welding process, the shaping component 200 moves synchronously with the welding head 110, and the tab 11232 between the shaping component 200 and the pressure-applying component 120 also has a certain degree of free deformation capability during the welding process. This allows the tab 11232 located below the pressure-applying component 120 to transfer a portion of the tensile deformation to the tab 11232 between the shaping component 200 and the pressure-applying component 120 during the tensile deformation process. This increases the total length of the tab 11232 that can undergo tensile deformation during the welding process, effectively reducing the amount of deformation borne by the tab 11232 per unit area, thereby reducing the possibility of cracking of the tab 11232 during the welding process. This effectively ensures the current carrying capacity of the tab 11232 and the charging and discharging capacity of the battery cell 1120, ultimately resulting in higher reliability of the battery cell 1120.

[0110] The welding device 2000 provided in this application embodiment, through the cooperation of the shaping component 200 and the rolling component 300, can not only block the transmission path of high-frequency vibration, but also pre-compress and bind the tab 11232, forming a certain shape on the tab 11232, such as an arc or L-shaped crease, so that the tab 11232 is less likely to be poorly inserted when it is inserted into the shell later.

[0111] The structure of the welding apparatus 2000 will be described in detail below.

[0112] In some embodiments, the shaping component 200 includes a guide extending in a first direction, and a telescopic member 220 sleeved on the outer periphery of the guide; one end of the guide is fixedly connected to the welding head 110, and the other end is slidably connected to the floating shaping block 210; or one end of the guide is fixedly connected to the floating shaping block 210, and the other end is slidably connected to the welding head 110.

[0113] In some embodiments, the guide member can be a guide post, and the diameter of the guide post can be greater than or equal to 1 mm and less than or equal to 5 mm.

[0114] By setting guide members, the telescopic member 220 can be telescopically deformed along the extension direction of the guide members during the telescopic deformation process, thereby making the deformation direction accuracy of the telescopic member 220 high, which is beneficial to ensuring the accuracy of the moving direction of the floating shaping block 210.

[0115] Please see Figure 6 and Figure 7 In some embodiments, the rolling assembly 300 includes a first rolling group 300a; the first rolling group 300a is disposed on the side of the floating shaping block 210 opposite to the retractable member 220.

[0116] The first rolling assembly 300a may include a rotating shaft 310 and a rolling element 320. The rotating shaft 310 is mounted on the side of the floating shaping block 210 opposite to the telescopic member 220, and the rolling element 320 is mounted on the rotating shaft 310 and can rotate relative to the rotating shaft 310. The rolling element 320 may be a rolling ball and / or a rolling sleeve, etc., and there is no special limitation, as long as it can rotate around a preset axis and roll against the surface tab 11232.

[0117] By installing a first rolling assembly 300a on the side of the floating shaping block 210 away from the telescopic member 220, when the floating shaping block 210 floats up and down along the first direction during the welding process, the first rolling assembly 300a can float up and down along the first direction under the drive of the floating shaping block 210 and can abut against the surface tab 11232. This allows the floating shaping block 210 to achieve rolling connection with the surface tab 11232 through the first rolling assembly 300a, reducing the friction between the shaping assembly 200 and the surface tab 11232.

[0118] Please see Figure 6 and Figure 7 In some embodiments, the first rolling group 300a is disposed at the edge of the floating shaping block 210 on the side close to the pressure member 120 along the second direction.

[0119] The floating shaping block 210 may be provided with a mounting groove on the side of the floating shaping block 210 near the pressure member 120 along the second direction. The first rolling group 300a can be partially accommodated in the mounting groove and can be connected to the groove wall of the mounting groove, so that the first rolling group 300a can be provided at the edge of the floating shaping block 210 near the pressure member 120 along the second direction.

[0120] By positioning the first rolling assembly 300a at the edge of the floating shaping block 210 along the second direction near the pressure member 120, the first rolling assembly 300a can be positioned closer to the welding area of ​​the tab 11232. When the pressure member 120 moves along the first direction, the first rolling assembly 300a can roll and abut against the area of ​​the surface tab 11232 near the welding area under the floating action of the floating shaping block 210, thereby floating and shaping the deformation of the tab 11232 in that area. Since the floating and shaping area is close to the welding area with a large deformation, the possibility of cracking caused by excessive deformation per unit area of ​​the tab 11232 during the welding process can be reduced.

[0121] Please see Figure 9 , Figure 9 It shows Figure 6 The diagram shows a top view of a portion of the structure of the welding apparatus 2000 during welding of battery cell 1120. In some embodiments, the dimension L2 of the rolling portion in the first rolling group 300a along a third direction is smaller than the dimension L3 of the floating shaping block 210 along a third direction; and the dimension L2 of the rolling portion in the first rolling group 300a along a third direction is larger than the dimension L1 of the workpiece to be welded along a third direction; the third direction, the first direction, and the second direction intersect each other in pairs; exemplarily, the third direction can be... Figure 9 The yy' direction in the middle.

[0122] The third direction can be a direction perpendicular to the direction from the cell body 11231 to the tab 11232, that is, the width direction of the tab 11232. In some embodiments, the third direction, the first direction, and the second direction are perpendicular to each other.

[0123] The dimension of the part to be welded along the third direction is the dimension of the tab 11232 along the third direction, which can also be understood as the width dimension of the tab 11232.

[0124] The first rolling assembly 300a may include a rotating shaft 310 and a rolling element 320 mounted on the rotating shaft 310. The rolling element 320 may be at least one of the rolling structures such as a rolling column, a rolling sleeve, or a rolling ball.

[0125] The rolling portion in the first rolling group 300a can be understood as follows: when the first rolling group 300a includes a rolling column group consisting of at least one rolling column, the rolling portion in the first rolling group 300a can be that rolling column group. For example, when the first rolling group 300a includes one rolling column, the dimension of the rolling portion in the first rolling group 300a along the third direction is the dimension of that rolling column along the third direction. When the first rolling group 300a includes multiple rolling columns, the dimension of the rolling portion in the first rolling group 300a along the third direction is the dimension of the multiple rolling columns as a whole along the third direction.

[0126] When the first rolling group 300a includes a rolling ball group consisting of multiple rolling balls arranged along a third direction, the rolling portion in the first rolling group 300a can be the dimension of the whole consisting of multiple rolling ball groups arranged along a third direction along the third direction.

[0127] The dimension L2 of the rolling portion in the first rolling group 300a along the third direction is smaller than the dimension L3 of the floating shaping block 210 along the third direction. This can be understood as the orthographic projection of the rolling portion in the first rolling group 300a along the first direction being located within the orthographic projection of the floating shaping block 210 along the first direction.

[0128] The dimension L2 of the rolling portion in the first rolling group 300a along the third direction is greater than the dimension L1 of the workpiece to be welded along the third direction. This can be understood as the dimension of the orthographic projection of the rolling portion in the first rolling group 300a along the first direction in the third direction being greater than the dimension of the orthographic projection of the workpiece to be welded along the first direction in the third direction.

[0129] The dimension L3 of the floating shaping block 210 along the third direction can be greater than or equal to the dimension L1+2mm of the workpiece to be welded along the third direction and less than or equal to L1+10mm. This can effectively ensure the floating shaping effect of the floating shaping block 210 on the tab 11232 along the third direction.

[0130] The dimension L3 of the floating shaping block 210 along the third direction can be greater than or equal to the dimension L2+1mm and less than or equal to L2+5mm of the rolling part in the first rolling group 300a along the third direction. This can effectively ensure the floating shaping effect of the floating shaping block 210 on the tab 11232 along the third direction.

[0131] By setting the size L2 of the rolling portion in the first rolling group 300a along the third direction to be smaller than the size L3 of the floating shaping block 210 along the third direction, the size of the floating shaping block 210 is made larger, and it can better float and abut against the tab 11232 below, thereby performing the floating shaping function.

[0132] By setting the dimension L2 of the rolling portion in the first rolling group 300a along the third direction to be larger than the dimension L1 of the workpiece to be welded along the third direction, the rolling portion of the tab 11232 can have a larger contact surface with the tab 11232 along the third direction during the welding process. As a result, when the floating shaping block 210 floats up and down to float and shape the tab 11232 during the welding process, the force exerted on the tab 11232 by the rolling portion along the third direction not only has a larger contact area but also a smaller rolling friction, making it easier to increase the total length of the tab 11232 that can undergo tensile deformation during the welding process.

[0133] By setting the dimension L3 of the floating shaping block 210 along the third direction to be greater than or equal to the dimension L1 of the part to be welded along the third direction, when the electrode 11232 to be welded is the electrode 11232 of the wound battery cell, considering the extreme misalignment between the layers of the electrode 11232 of the wound battery cell, the floating shaping block 210 can still cover all the electrodes 11232 well, thereby ensuring a good shaping effect during the welding process.

[0134] Please see Figures 6-8 In some embodiments, the floating shaping block 210 has a first plane 211 formed on the side opposite to the telescopic member 220; the first plane 211 is inclined upward from the side near the pressure member 120 toward the side away from the pressure member 120 so as to be able to contact the area of ​​thickness variation in the workpiece to be welded.

[0135] like Figures 6-8 As shown, along the zz' direction in the figure, the first plane 211 is inclined upward from the side closer to the pressure member 120 toward the side away from the pressure member 120, that is, it is inclined from the side closer to the pressure member 120 toward the root of the tab 11232, so that the first plane 211 can better fit with the area of ​​thickness variation of the tab 11232, and the two have a larger contact area.

[0136] Since the tab 11232 needs to be extended from the battery cell assembly 1123, it needs to undergo the following process: Figure 4 The bending and smoothing operation is performed before welding. Therefore, when the floating shaping block 210 floats and abuts against the tab 11232, it needs to be adapted to the bending shape of the tab 11232 to reduce the pressure per unit area of ​​the tab 11232. When the tab 11232 is in the welding machine, the floating shaping block 210 floats up and down, and the inclined first plane 211 can achieve better conformal adaptation with the area of ​​thickness variation of the tab 11232. Figure 4 As shown in the figure, the rolling friction effect achieved by the rolling part of the first rolling group 300a abutting against the tab 11232 is combined with the rolling friction effect achieved by the floating shaping block 210 to greatly reduce the tensile constraint of the tab 11232 during the welding process, ensuring the effective shaping of the tab 11232, greatly reducing the tensile damage of the surface tab 11232 during the welding process, and thus greatly improving the possibility of welding cracking of the tab 11232.

[0137] Please see Figures 6-8 In some embodiments, the orthographic projection of the first plane 211 along the first direction along the second direction has a dimension d1 that satisfies the condition: 1mm≤d1≤5mm.

[0138] Considering the welding effect, when welding multiple layers of tabs 11232 together, the number of layers of tabs 11232 needs to be within a certain range. If the number of tabs 11232 layers is too small, burn-through is likely to occur, and the weld pool penetration may affect other structures below the tabs 11232. If the number of tabs 11232 layers is too large, some layers of tabs 11232 may not achieve effective welding connection. Therefore, it is necessary to ensure that the number of tabs 11232 layers welded in each instance is within a certain range, and thus the size of the thickness variation area of ​​the tabs 11232 also needs to be within a certain range.

[0139] This application sets the dimension d1 of the orthographic projection of the first plane 211 along the first direction along the second direction to be greater than or equal to 1 mm and less than or equal to 5 mm. This makes the dimension d1 of the orthographic projection of the first plane 211 along the first direction along the second direction more suitable, which can effectively ensure the contact area between the first plane 211 and the cluster of tabs 11232 formed by the appropriate number of tab layers 11232. As a result, the floating shaping area of ​​the tabs 11232 during the welding process is more suitable, and the floating shaping block 210 has a better floating shaping effect on the tabs 11232. This can reduce the possibility of excessive stretching of the surface tabs 11232 during the welding process, which may lead to friction cracking. It can also reduce the need for the tabs 11232 to be too long, thus reducing the possibility of unnecessary cost increases for the battery cell.

[0140] In some embodiments, the orthographic projection of the first plane 211 along the first direction has a dimension d1 along the second direction of 1 mm. This makes the dimension d1 smaller and the dimension occupied by the entire floating block along the second direction smaller. When the number of electrode tabs 11232 to be welded is small, it is not easy for a single layer of electrode tab 11232 to bear a large floating shaping area.

[0141] In some embodiments, the orthographic projection of the first plane 211 along the first direction along the second direction has a size d1 of 5 mm. This allows the size of d1 to be larger, so that when there are many layers of tabs 11232 to be welded, each layer of tabs 11232 can achieve better floating shaping with a larger contact area.

[0142] In some embodiments, the orthographic projection of the first plane 211 along the first direction along the second direction has a size d1 of 3 mm, which makes the size d1 more moderate, and the floating shaping area of ​​the tab 11232 during the welding process more moderate.

[0143] In some embodiments, the dimension d1 of the orthographic projection formed by the first plane 211 along the first direction along the second direction is 1.5mm, 2mm, 2.5mm, 3.5mm, 4mm, 4.5mm or any value between 1mm and 5mm, without any special limitation.

[0144] Please see Figures 6-8 In some embodiments, the orthographic projection of the first plane 211 along the first direction has a dimension d1 along the second direction that satisfies the condition: 2mm ≤ d1 ≤ 3mm. By further limiting the dimension d1 of the orthographic projection of the first plane 211 along the first direction to a range greater than or equal to 2mm and less than or equal to 3mm, the dimension d1 of the orthographic projection of the first plane 211 along the first direction is made more suitable. This effectively ensures the contact area between the first plane 211 and the cluster of tabs 11232 formed by a suitable number of tab layers 11232, thereby making the floating shaping area of ​​the tabs 11232 more suitable during the welding process, and the floating shaping block 210 has a better floating shaping effect on the tabs 11232.

[0145] In some embodiments, the surface roughness of the first plane 211 is less than or equal to 0.025 μm.

[0146] The floating shaping block 210 can be made of hard and brittle materials that can be machined with ultra-precision and some high-gloss plastics, so that the surface roughness of the first plane 211 can be processed to a low value.

[0147] The first plane 211 can also be coated with an ultra-thin coating, such as a diamond-like coating, thereby achieving a lower roughness through the mirror effect of the coating.

[0148] This embodiment sets the surface roughness of the first plane 211 to less than or equal to 0.025 μm, thus making the first plane 211 a mirror-like inclined surface. This effectively reduces the coefficient of friction between the first plane 211 and the surface tab 11232 under high-frequency vibration during welding, achieving low-friction, high-quality welding. This also avoids excessive stretching of the surface tab 11232 during welding, greatly improving welding quality reliability. Simultaneously, during the high-frequency vibration welding process of the welding head 110, the floating shaping block 210 can effectively perform local longitudinal displacement, thereby reducing frictional and tensile damage to the surface tab 11232 and improving the cracking of the tab 11232.

[0149] In some embodiments, the surface of the first plane 211 is coated with a diamond-like coating.

[0150] Diamond-like carbon (DLC) coating is a high-performance surface engineering material with excellent hardness and wear resistance, and a low coefficient of friction.

[0151] By coating the surface of the first plane 211 with a diamond-like coating, the first plane 211 is able to form a mirror effect and has a low surface roughness.

[0152] In some embodiments, the thickness of the diamond-like carbon coating is greater than or equal to 0.02 mm and less than or equal to 0.03 mm. If the thickness of the diamond-like carbon coating is too large, the processing cost will be high, while if the thickness of the diamond-like carbon coating is too small, it will be difficult to form a uniform film layer on the surface of the first plane 211.

[0153] By setting the thickness of the diamond-like carbon coating to a range greater than or equal to 0.02 mm and less than or equal to 0.03 mm, the material cost of the diamond-like carbon coating itself is not too high, and the uniformity of the film layer is also better.

[0154] Please see Figures 6-8 In some embodiments, the first rolling group 300a is disposed on the outer periphery of the edge of the first plane 211 near the pressure member 120.

[0155] A receiving groove may be provided on the side of the first plane 211 near the pressure member 120. The first rolling assembly 300a can be partially received in the receiving groove and can be connected to the groove wall, so that the first rolling assembly 300a can be disposed on the outer periphery of the edge of the first plane 211 near the pressure member 120. The receiving groove can be disposed on the first plane 211 or adjacent to the first plane 120, without special limitation.

[0156] By setting the first rolling assembly 300a on the outer periphery of the edge of the first plane 211 near the pressure member 120, the first rolling assembly 300a can be closer to the welding area of ​​the tab 11232. When the pressure member 120 moves along the first direction, the first rolling assembly 300a can roll and abut against the area of ​​the surface tab 11232 near the welding area under the floating action of the floating shaping block 210, thereby floating and shaping the deformation of the tab 11232 in that area. Since the floating and shaping area is close to the welding area with a large deformation, the possibility of cracking caused by excessive deformation per unit area of ​​the tab 11232 during the welding process can be reduced.

[0157] In this embodiment, by setting the first plane 211 as an inclined surface and setting the first rolling group 300a on the side of the first plane 211 near the pressure member 120, the friction between the floating shaping block 210 and the electrode 11232 during the electrode tab 11232 welding process is adjusted to rolling friction. Combined with the longitudinal micro-movement of the floating shaping block 210 along the first direction, the tensile constraint effect on the electrode tab 11232 is greatly reduced. This ensures that when the welding head drives the electrode tab 11232 to undergo longitudinal displacement, the constraint of the floating shaping block 210 on the electrode tab 11232 is greatly reduced, but it can still play a good shaping role for the electrode tab 11232, which greatly improves the quality and reliability of the ultrasonic welding process of power battery.

[0158] In some embodiments, the floating shaping block 210 has a pre-welding state and a floating shaping state relative to the workpiece to be welded; in the pre-welding state, the floating shaping block 210 can abut against the workpiece to be welded; in the floating shaping state, the floating shaping block 210 can switch back and forth between abutting and separating states relative to the workpiece to be welded along a first direction.

[0159] When the workpiece to be welded is moved to the welding station of the welding device 2000, and the welding operation can be performed on the workpiece after the drive unit 400 of the welding device 2000 is activated, the state of the floating shaping block 210 relative to the workpiece to be welded is called the pre-welding state. After the drive unit 400 of the welding device 2000 is activated, the state of the floating shaping block 210 relative to the workpiece to be welded is called the floating state.

[0160] In the pre-welding state, the floating shaping block 210 can abut against the tab 11232 to be welded, thereby creating a tab 11232 of a certain size between the floating shaping block 210 and the pressure member 120. In the floating shaping state, the floating shaping block 210 can switch back and forth between the abutment and separation states along the first direction relative to the workpiece to be welded, thereby enabling the floating shaping block 210 to effectively perform local longitudinal displacement, thus reducing the frictional and tensile damage of the pressure member 120 to the surface tab 11232, and improving the cracking of the tab 11232.

[0161] In some embodiments, when the floating shaping block 210 is in a pre-welding state relative to the workpiece to be welded, the height of the telescopic member 220 is within the range of greater than or equal to 0.5 mm and less than or equal to 4 mm, and the travel distance of the telescopic member 220 on the side close to the floating shaping block 210 can be within the range of greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0162] Please see Figures 4-8 In some embodiments, the shaping assembly 200 further includes a fixed shaping plate 230 connected to the welding head 110, the fixed shaping plate 230 being disposed between the pressure member 120 and the floating shaping block 210 and spaced apart from each other.

[0163] The fixed shaping plate 230 can be fixedly connected to the welding head 110, so that the fixed shaping plate 230 can be stably fixed relative to the tab 11232. The fixed shaping plate 230 can be integrally formed with the welding head 110.

[0164] By setting a fixed shaping plate 230, which is positioned between the pressure-applying member 120 and the floating shaping block 210 and spaced apart from each other, the fixed shaping plate 230 can intermittently contact the surface tab 11232 when the floating shaping block 210 floats up and down to perform floating shaping on the tab 11232, thereby contacting and damping the tab 11232 and preventing excessive deformation of the tab 11232.

[0165] Please see Figures 6-8 In some embodiments, the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction satisfies the condition: 0.02mm≤d2≤0.05mm.

[0166] Considering processing errors, assembly difficulty, and motion interference between the floating shaping block 210 and the fixed shaping plate 230, this application sets the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction to be greater than or equal to 0.02 mm and less than or equal to 0.05 mm. This makes the distance between the fixed shaping plate 230 and the floating shaping block 210 smaller, thereby making the fixed shaping plate 230 have a better vibration damping effect on the tab 11232.

[0167] In some embodiments, the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction is 0.02 mm, which makes the distance between the two smaller and the fixed shaping plate 230 has a better vibration damping effect on the tab 11232.

[0168] In some embodiments, the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction is 0.05mm, which makes the distance between the two larger, making their assembly more convenient, and the floating shaping block 210 less likely to interfere with the fixed shaping plate 230 during the up-and-down floating process.

[0169] In some embodiments, the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction is 0.035mm. This makes the distance between the two more moderate, which not only makes the assembly of the two more convenient, but also makes it less likely for the floating shaping block 210 to interfere with the fixed shaping plate 230 during the up and down floating process. At the same time, it also makes the fixed shaping plate 230 have a better vibration damping effect on the tab 11232.

[0170] In some embodiments, the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction is 0.025mm, 0.03mm, 0.04mm, 0.045mm or any value between 0.02mm and 0.05mm, and there is no special limitation thereto.

[0171] In some embodiments, the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction satisfies the condition: 0.02mm ≤ d2 ≤ 0.03mm. By further limiting the distance d2 between the fixed shaping plate 230 and the floating shaping block 210 along the second direction to a range greater than or equal to 0.02mm and less than or equal to 0.03mm, the distance between the fixed shaping plate 230 and the floating shaping block 210 is smaller, thereby enabling the fixed shaping plate 230 to have a better vibration damping effect on the tab 11232.

[0172] Please see Figures 6-8 In some embodiments, the end of the fixing shaping plate 230 near the workpiece to be welded is formed with a fixing shaping surface 231, which includes at least a partial arcuate structure.

[0173] The fixed shaping surface 231 can be at least partially circular arc structure, such as a semi-circular arc structure, which makes the processing of the fixed shaping surface 231 more convenient.

[0174] By setting the fixed shaping surface 231 to include at least a partially curved structure, the contact surface between the fixed shaping surface 231 and the tab 11232 is relatively smooth when they come into contact during vibration damping. The fixed shaping surface 231 is less likely to puncture or cut the tab 11232, thus reducing the possibility of the tab 11232 cracking.

[0175] In some embodiments, in the pre-welding state, the floating shaping block 210 abuts against the workpiece to be welded, and the fixed shaping surface 231 separates from the workpiece to be welded.

[0176] When in the pre-welding state, that is, before welding, the floating shaping block 210 abuts against the tab 11232, and the fixed shaping surface 231 separates from the tab 11232. This allows a portion of the tab 11232 to be pre-reserved between the floating shaping block 210 and the pressure applying member 120. As a result, during the tensile deformation process, the tab 11232 located below the pressure applying member 120 can transfer a portion of the tensile deformation to the tab 11232 between the floating shaping block 210 and the pressure applying member 120. This increases the total length of the tab 11232 that can undergo tensile deformation during welding, thereby effectively reducing the amount of deformation borne by the tab 11232 per unit area. This reduces the possibility of the tab 11232 cracking during welding, effectively ensuring the current carrying capacity of the tab 11232 and the charging and discharging capacity of the battery cell 1120, ultimately resulting in higher reliability of the battery cell 1120.

[0177] Please see Figures 6-8 In some embodiments, in the pre-welding state, along the first direction, the rolling portion in the first rolling group 300a has a gap between the contact surface of the workpiece to be welded and the fixed shaping surface 231.

[0178] By setting a gap along the first direction between the contact surface of the rolling part in the first rolling group 300a and the tab 11232 and the fixed shaping surface 231, the rolling part in the first rolling group 300a can contact the surface tab 11232 in the pre-welding state, while the fixed shaping surface 231 is separated from the surface tab 11232. This allows a portion of the tab 11232 to remain between the rolling part in the first rolling group 300a and the pressure member 120, thereby increasing the total length of the tab 11232 that can undergo tensile deformation during the welding process.

[0179] Please see Figures 6-8In some embodiments, in the pre-welding state, along the first direction, the minimum distance d3 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded and the fixed shaping surface 231 satisfies the condition: 0.5mm≤d3≤1mm.

[0180] In the pre-welding state, the rolling portion in the first rolling group 300a may have multiple contact points with the workpiece to be welded (tab 11232). In this case, the lowest point of contact between the rolling portion in the first rolling group 300a and the surface tab 11232 along the first direction is selected. Figure 9 A plane parallel to the xx'yy' plane, along with the fixed shaping surface 231. Figures 6-8 The lowest point in the zz' direction and Figure 9 The distance between planes parallel to the xx'yy' plane is the minimum spacing d3.

[0181] By setting the minimum spacing d3 to a range greater than or equal to 0.5 mm and less than or equal to 1 mm, the minimum spacing between the rolling part in the first rolling group 300a and the lowest contact surface of the workpiece to be welded, and between the rolling part and the fixed shaping surface 231, is appropriately suitable. When the floating shaping block 210 floats up and down, the tab 11232 can float up and down within a suitable range under the vibration damping and movement constraints of the fixed shaping block. This ensures that the floating range of the tab 11232 is neither too small, resulting in a weak floating shaping effect, nor too large, affecting the welding effect.

[0182] In some embodiments, the minimum distance d3 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded and the fixed shaping surface 231 is 0.5mm, so that the contact vibration damping effect of the fixed shaping plate 230 to the tab 11232 is better.

[0183] In some embodiments, the minimum distance d3 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded and the fixed shaping surface 231 is 1mm, so that when the floating shaping block 210 floats up and down, the tab 11232 has a large floating shaping deformation.

[0184] In some embodiments, the minimum distance d3 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded and the fixed shaping surface 231 is 0.75mm. This allows the tab 11232 to have a more suitable floating shaping deformation amount when the floating shaping block 210 floats up and down, and the fixed shaping plate 230 also has a better contact vibration damping effect on the tab 11232.

[0185] In some embodiments, the minimum distance d3 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded, and between the rolling portion and the fixed shaping surface 231, is 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or any value between 0.5mm and 1mm, without any special limitation.

[0186] Please see Figure 7 In some embodiments, the rolling assembly 300 includes a second rolling group 300b; the second rolling group 300b is disposed on the side of the fixed shaping plate 230 near the workpiece to be welded.

[0187] The second rolling group 300b has the same structure as the first rolling group 300a, but it may also be different; no special restrictions are placed on this.

[0188] The second rolling assembly 300b may include a rotating shaft 310 and rolling columns mounted on the rotating shaft 310.

[0189] By setting a second rolling group 300b on the side of the fixed shaping plate 230 close to the workpiece to be welded, the fixed shaping plate 230 and the surface tab 11232 can abut against each other through the second rolling group 300b, thereby forming rolling friction between the two. The friction force is small, which greatly reduces the tensile damage of the surface tab 11232 during the welding process, and thus greatly improves the possibility of welding cracking of the tab 11232.

[0190] In some embodiments, in the pre-welding state, the first rolling group 300a abuts against the workpiece to be welded, and the second rolling group 300b separates from the workpiece to be welded.

[0191] In the pre-welding state, the first rolling assembly 300a abuts against the tab 11232, while the second rolling assembly 300b separates from the tab 11232. This allows a portion of the tab 11232 to be reserved between the first rolling assembly 300a and the pressure member 120 in the pre-welding state, thereby increasing the total length of the tab 11232 that can undergo tensile deformation during the welding process. The second rolling assembly 300b will not affect the abutment between the first rolling assembly 300a and the part to be welded in the pre-welding state.

[0192] By setting a first rolling group 300a on the side of the floating shaping block 210 close to the workpiece to be welded, and setting a second rolling group 300b on the side of the fixed shaping plate 230 close to the workpiece to be welded, the floating shaping block 210 achieves intermittent contact with the surface tab 11232 through the first rolling group 300a, and the two engage in rolling friction during contact. Meanwhile, the fixed shaping plate 230 achieves intermittent contact with the surface tab 11232 through the second rolling group 300b, and the two engage in rolling friction during contact. This reduces the shaping friction force on the surface tab 11232, significantly mitigating tensile damage to the surface tab 11232 during welding, and thus greatly reducing the possibility of welding cracks in the tab 11232.

[0193] Please see Figure 7 In some embodiments, in the pre-welding state, along the first direction, the minimum distance d4 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded, and the second rolling group 300b, satisfies the condition: 0.5mm≤d4≤1mm.

[0194] In the pre-welded state, the rolling portion in the first rolling group 300a may have multiple contact points with the tab 11232. In this case, the lowest point of contact between the rolling portion in the first rolling group 300a and the surface tab 11232 along the first direction is selected. Figure 9 The plane parallel to the xx'yy' plane, and along the second rolling group 300b Figures 6-8 The lowest point in the zz' direction and Figure 9 The distance between planes parallel to the xx'yy' plane is the minimum spacing d4.

[0195] By setting the minimum spacing d4 to a range greater than or equal to 0.5 mm and less than or equal to 1 mm, the minimum spacing between the rolling part in the first rolling group 300a and the lowest contact surface of the workpiece to be welded, and between the rolling part and the second rolling group 300b, is appropriately suitable. When the floating shaping block 210 floats up and down, the tab 11232 can float up and down within a suitable range under the vibration damping and movement constraints of the fixed shaping block. This ensures that the floating range of the tab 11232 is neither too small, resulting in a weak floating shaping effect, nor too large, affecting the welding effect.

[0196] In some embodiments, the minimum distance d4 between the rolling portion of the first rolling group 300a and the lowest contact surface of the workpiece to be welded and the second rolling group 300b is 0.5mm, so that the second rolling group 300b has a better contact vibration damping effect on the tab 11232.

[0197] In some embodiments, the minimum distance d4 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded and the second rolling group 300b is 1mm, so that when the floating shaping block 210 floats up and down, the tab 11232 has a large floating shaping deformation amount.

[0198] In some embodiments, the minimum distance d4 between the rolling portion of the first rolling group 300a and the lowest contact surface of the workpiece to be welded and the second rolling group 300b is 0.75mm. This allows the tab 11232 to have a more suitable floating shaping deformation amount when the floating shaping block 210 floats up and down, and the second rolling group 300b also has a better contact vibration damping effect on the tab 11232.

[0199] In some embodiments, the minimum distance d4 between the rolling portion in the first rolling group 300a and the lowest contact surface of the workpiece to be welded, and the second rolling group 300b, is 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or any value between 0.5mm and 1mm, without any special limitation.

[0200] Please see Figure 8 In some embodiments, the shaping assembly 200 further includes a fixed shaping plate 230 connected to the welding head 110. The fixed shaping plate 230 is disposed between the pressure member 120 and the floating shaping block 210 and spaced apart from each other. The rolling assembly 300 includes a second rolling group 300b, which is disposed on the side of the fixed shaping plate 230 close to the workpiece to be welded. The floating shaping block 210 has a pre-welding state relative to the workpiece to be welded. In the pre-welding state, the floating shaping block 210 abuts against the workpiece to be welded, and the second rolling group 300b separates from the workpiece to be welded.

[0201] By setting a fixed shaping plate 230, which is positioned between the pressure-applying member 120 and the floating shaping block 210 and spaced apart from each other, the fixed shaping plate 230 can intermittently contact the surface tab 11232 when the floating shaping block 210 floats up and down to perform floating shaping on the tab 11232, thereby contacting and damping the tab 11232 and preventing excessive deformation of the tab 11232.

[0202] By setting a second rolling group 300b on the side of the fixed shaping plate 230 close to the workpiece to be welded, the fixed shaping plate 230 and the surface tab 11232 can abut against each other through the second rolling group 300b, thereby forming rolling friction between the two. The friction force is small, which greatly reduces the tensile damage of the surface tab 11232 during the welding process, and thus greatly improves the possibility of welding cracking of the tab 11232.

[0203] Please see Figure 8 In some embodiments, in the pre-welding state, along the first direction, the minimum distance d5 between the lowest contact surface of the floating shaping block 210 and the workpiece to be welded and the second rolling group 300b satisfies the condition: 0.5mm≤d5≤1mm.

[0204] In the pre-welding state, the floating shaping block 210 and the workpiece to be welded (tie 11232) may have multiple contact points. In this case, the lowest point of contact between the floating shaping block 210 and the surface tie 11232 along the first direction is selected. Figure 9 The plane parallel to the xx'yy' plane, and along the second rolling group 300b Figures 6-8 The lowest point in the zz' direction and Figure 9 The distance between planes parallel to the xx'yy' plane is the minimum spacing d5.

[0205] By setting the minimum spacing d5 to a range greater than or equal to 0.5 mm and less than or equal to 1 mm, the minimum spacing between the lowest contact surface of the floating shaping block 210 and the workpiece to be welded, and between the floating shaping block 210 and the second rolling group 300b, becomes more suitable. When the floating shaping block 210 floats up and down, the tab 11232 can float within a suitable range under the vibration damping and movement constraints of the fixed shaping block. This ensures that the floating range of the tab 11232 is neither too small, resulting in a weak floating shaping effect, nor too large, affecting the welding effect.

[0206] In some embodiments, the minimum distance d5 between the lowest contact surface of the floating shaping block 210 and the workpiece to be welded and the second rolling group 300b is 0.5mm, so that the second rolling group 300b has a better contact vibration damping effect on the tab 11232.

[0207] In some embodiments, the minimum distance d5 between the lowest contact surface of the floating shaping block 210 and the workpiece to be welded and the second rolling group 300b is 1mm, so that the tab 11232 has a large floating shaping deformation amount when the floating shaping block 210 floats up and down.

[0208] In some embodiments, the minimum distance d5 between the lowest contact surface of the floating shaping block 210 and the workpiece to be welded and the second rolling group 300b is 0.75mm. This allows the tab 11232 to have a more suitable floating shaping deformation amount when the floating shaping block 210 floats up and down, and the contact vibration damping effect of the fixed shaping plate 230 on the tab 11232 is also better.

[0209] In some embodiments, the minimum distance d5 between the lowest contact surface of the floating shaping block 210 and the workpiece to be welded and the second rolling group 300b is 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or any value between 0.5mm and 1mm, without any special limitation.

[0210] Please see Figures 6-8 In some embodiments, the rolling assembly 300 includes a pivot 310 and a rolling element 320. The pivot 310 extends along a third direction and is mounted on the shaping assembly 200, wherein the third direction, the first direction, and the second direction intersect each other in pairs; exemplaryly, the third direction may be perpendicular to both the first direction and the second direction, such as... Figure 9 The yy' direction is shown; the rolling element 320 is sleeved on the rotating shaft 310 and can rotate relative to the axis of the rotating shaft 310.

[0211] The third direction can be set at a 90° angle to the plane containing the first and second directions, or it can be set at any value of 60°, 75°, 80°, 85° or greater than 0 and less than or equal to 90° to the plane containing the first and second directions, without any special limitation.

[0212] A bearing can be installed on the rotating shaft 310. The inner ring of the bearing is fixedly connected to the rotating shaft 310, and the outer ring of the bearing is fixedly connected to the rolling element 320. The inner ring of the bearing can rotate relative to the outer ring, thereby enabling the rolling element 320 to rotate relative to the axis of the rotating shaft 310.

[0213] In some embodiments, the rolling element 320 may be a rolling column, and the diameter of the rolling column may be greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0214] In some embodiments, the rolling element 320 may be a rolling column, and the diameter of the rolling column may be greater than or equal to 1 mm and less than or equal to 1.5 mm.

[0215] During the welding process of tab 11232, that is, when the floating shaping block 210 is in a floating shaping state relative to tab 11232, the rolling element 320 can intermittently abut against the surface tab 11232. At the same time, the rolling element 320 rotates around the rotating shaft 310, so that the rolling element 320 and the surface tab 11232 are in rolling friction contact, and the friction between the two is small.

[0216] In some embodiments, the scrolling component 300 includes multiple sets; the multiple sets of scrolling components 300 are spaced apart along a second direction and / or a third direction.

[0217] By setting multiple sets of rolling components 300, and the multiple sets of rolling components 300 are spaced apart along the second direction and / or the third direction, it is possible to achieve rolling contact with multiple areas of the surface tab 11232 through the multiple sets of rolling components 300.

[0218] Please see Figure 7 In some embodiments, the rolling component 300 includes two sets of rolling components 300 arranged at intervals along the second direction, wherein one set of rolling components 300 is disposed on the floating shaping block 210 and the other set of rolling components 300 is disposed on the fixed shaping plate 230.

[0219] In some embodiments, the rolling assembly 300 includes three sets of rolling assemblies 300 arranged at intervals along the second direction, wherein two sets of rolling assemblies 300 are disposed on the floating shaping block 210, and one set of rolling assemblies 300 is disposed on the fixed shaping plate 230.

[0220] In some embodiments, the scrolling component 300 includes N groups (N is a positive integer greater than or equal to 2), and the N groups of scrolling components 300 are spaced apart on the floating shaping block 210 along a third direction.

[0221] In some embodiments, the rolling component 300 includes N groups (N is a positive integer greater than or equal to 2), and the N groups of rolling components 300 are spaced apart on the fixed shaping plate 230 along a third direction.

[0222] In some embodiments, the rolling component 300 includes M groups (M is a positive integer greater than or equal to 2), N groups of rolling components 300 are spaced apart on the floating shaping block 210 along a third direction, and P groups of rolling components 300 are spaced apart on the fixed shaping plate 230 along a third direction (N is a positive integer greater than or equal to 2, P is a positive integer greater than or equal to 2, N+P=M).

[0223] In some embodiments, a plurality of spaced-apart scrolling components 300 are provided on the first plane 211 of the floating shaping block 210.

[0224] This embodiment of the application sets up a floating shaping block 210 and a rolling component 300 on the floating shaping block 210. At the same time, the first plane 211 in contact with the tab 11232 is mirror-finished. This greatly reduces the constraint of the floating shaping block 210 on the surface tab 11232 during ultrasonic welding. That is, by reducing the constraint of the tab 11232 in the shaping block area, the tab 11232 located between the shaping block and the solder mark 11233 can be well subjected to small-scale tensile deformation during welding. This allows the deformation to be distributed over a longer distance, reducing the local stress concentration of the tab 11232 and greatly improving the cracking of the tab 11232.

[0225] Please see Figure 9 In some embodiments, the welding head 110 is configured with a clearance through hole 112 extending along a first direction; the pressure member 120 extends out of the clearance through hole 112.

[0226] Please see Figure 5 In some embodiments, a welding abutment surface 111 is formed on the side of the welding head 110 near the pressure member 120. The welding abutment surface 111 is the surface of the welding head 110 near the workpiece to be welded, and the welding abutment surface 111 can abut against the welding surface of the workpiece to be welded.

[0227] The size of the clearance through hole 112 is larger than the size of the welding contact surface 111, so that the welding head of the mounting pressure member 120 can extend out of the clearance through hole 112.

[0228] By providing a clearance through hole 112 on the welding head 110 and allowing the welding head with the pressure-applying member 120 installed to extend out of the clearance through hole 112, the driving member 400 can control the welding head to move up and down in the first direction when controlling the distance between the pressure-applying member 120 and the workpiece to be welded, which is more convenient.

[0229] Please see Figure 9 In some embodiments, the dimension d7 of the avoidance through hole 112 along the second direction is greater than the dimension d6 of the solder mark 11233 along the second direction. For example, d7 = d6 + (2-6) mm. The dimension L5 of the avoidance through hole 112 along the third direction is greater than the dimension L4 of the solder mark 11233 along the third direction. For example, L5 = L4 + (2-6) mm. By limiting the dimensional relationship between the avoidance through hole 112 and the solder mark 11233, the distance between the floating shaping block 210 and the solder mark 11233 is more suitable, which can achieve a good floating shaping effect. The distance between the fixed shaping plate 230 and the solder mark 11233 is also more suitable, which can achieve a good contact vibration damping effect. Furthermore, the assembly of the welding head of the mounting pressure member 120 and the avoidance through hole 112 is also more suitable, and the hole wall of the avoidance through hole 112 and the welding head are less likely to interfere with each other, reducing the possibility of incomplete soldering.

[0230] In some embodiments, the pressure-applying element 120 is an ultrasonic welding tooth assembly. The ultrasonic welding tooth assembly includes a plurality of welding teeth arranged laterally and vertically. The ultrasonic welding tooth assembly transmits ultrasonic energy to the surface of the workpiece to be welded, and frictional heat is generated between the workpiece and the workpiece, causing the workpiece to melt and eventually cool and solidify to join together.

[0231] The welding apparatus 2000 provided in this application embodiment includes a welding assembly 100, a shaping assembly 200, and a rolling assembly 300. The welding assembly 100 includes a welding head 110 and a pressure applying member 120. The pressure applying member 120 is disposed on the welding head 110 and is capable of abutting against the workpiece to be welded along a first direction; exemplarily, the first direction can be the thickness direction of the welding area of ​​the workpiece to be welded. Figures 4-8 In the zz' direction, the shaping component 200 is connected to the welding head 110 and is spaced apart from the pressure member 120 along the second direction, which is angled to the first direction; for example, the second direction can be Figures 4-8 The rolling assembly 300 is disposed along the second direction on one side of the pressure member 120 and installed on the end of the shaping assembly 200 facing the workpiece to be welded; the rolling assembly 300 can rotate around a preset axis. The shaping assembly 200 includes a floating shaping block 210 and a telescopic member 220, the telescopic member 220 is connected to the floating shaping block 210 and can drive the floating shaping block 210 to float up and down along the first direction according to its own telescopicity. The rolling assembly 300 includes a first rolling group 300a; the first rolling group 300a is disposed on the side of the floating shaping block 210 away from the telescopic member 220. The size of the rolling portion in the first rolling group 300a along the third direction is smaller than the size of the floating shaping block 210 along the third direction; and the size of the rolling portion in the first rolling group 300a along the third direction is larger than the size of the workpiece to be welded along the third direction; the third direction, the first direction and the second direction intersect each other in pairs; for example, the third direction can be Figure 9 The floating shaping block 210 has a first plane 211 formed on the side opposite to the telescopic member 220. The first plane 211 is inclined upward from the side near the pressure member 120 toward the side away from the pressure member 120, so as to be able to contact the area with thickness variation in the workpiece to be welded. The floating shaping block 210 has a pre-welding state and a floating shaping state relative to the workpiece to be welded. In the pre-welding state, the floating shaping block 210 can abut against the workpiece to be welded. In the floating shaping state, the floating shaping block 210 can switch back and forth between the abutment and separation states relative to the workpiece to be welded along the first direction. The shaping assembly 200 also includes a fixed shaping plate 230 connected to the welding head 110. The fixed shaping plate 230 is disposed between the pressure member 120 and the floating shaping block 210 and spaced apart from each other.

[0232] The welding apparatus 2000 provided in this application embodiment, when welding the tabs 11232 of a battery cell 1120, involves a pressure member 120 moving along a first direction. The tabs 11232 located below the pressure member 120 undergo tensile deformation during the vibration and pressing of the pressure member 120, thus achieving welding. During the welding process, a shaping component 200 connected to a welding head 110 is provided on the outer periphery of the pressure member 120 along a second direction. A rolling component 300 is mounted on the shaping component 200. Since the rolling component 300 can rotate around a preset axis and roll against the surface tabs 11232, the shaping component 200 and the surface tabs 11232 roll against each other during welding. This results in rolling friction between the shaping component 200 and the surface tabs 11232, with relatively low frictional force. Furthermore, the tabs 11232 between the rolling component 300 and the pressure member 120 also possess a certain degree of free deformation capability during the welding process. This allows the tab 11232 located below the pressure member 120 to transfer a portion of the tensile deformation during the tensile deformation process to the tab 11232 between the rolling assembly 300 and the pressure member 120. This increases the total length of the tab 11232 that can undergo tensile deformation during the welding process, thereby effectively reducing the amount of deformation borne by the tab 11232 per unit area. This reduces the possibility of the tab 11232 cracking during the welding process, effectively ensuring the current carrying capacity of the tab 11232 and the charging and discharging capacity of the battery cell 1120, ultimately resulting in higher reliability of the battery cell 1120.

[0233] During the welding process, a shaping component 200 connected to the welding head 110 is provided on the outer periphery of the pressure-applying component 120. The shaping component 200 includes a floating shaping block 210 and a telescopic component. Therefore, the floating shaping block 210 can float up and down along the first direction and roll against the surface tab 11232 via the rolling component 300. During the welding process, the shaping component 200 moves synchronously with the welding head 110, and the tab 11232 between the shaping component 200 and the pressure-applying component 120 also has a certain degree of free deformation capability during welding. This allows the tab 11232 located below the pressure-applying component 120 to transfer a portion of the tensile deformation during the tensile deformation process to the tab 11232 between the shaping component 200 and the pressure-applying component 120. This increases the total length of the tab 11232 that can undergo tensile deformation during the welding process, thereby effectively reducing the amount of deformation borne by the tab 11232 per unit area. This reduces the possibility of the tab 11232 cracking during the welding process, effectively ensuring the current carrying capacity of the tab 11232 and the charging and discharging capacity of the battery cell 1120, ultimately resulting in higher reliability of the battery cell 1120.

[0234] By positioning the first rolling assembly 300a at the edge of the floating shaping block 210 along the second direction near the pressure member 120, the first rolling assembly 300a can be positioned closer to the welding area of ​​the tab 11232. When the pressure member 120 moves along the first direction, the first rolling assembly 300a can roll and abut against the area of ​​the surface tab 11232 near the welding area under the floating action of the floating shaping block 210, thereby floating and shaping the deformation of the tab 11232 in that area. Since the floating and shaping area is close to the welding area with a large deformation, the possibility of cracking caused by excessive deformation per unit area of ​​the tab 11232 during the welding process can be reduced.

[0235] By setting the size of the rolling portion in the first rolling group 300a along the third direction to be smaller than the size of the floating shaping block 210 along the third direction, the size of the floating shaping block 210 is made larger, and it can better float and abut against the tab 11232 below, thereby performing the floating shaping function.

[0236] By setting the dimension of the rolling portion in the first rolling group 300a along the third direction to be larger than the dimension of the workpiece to be welded along the third direction, the rolling portion of the tab 11232 can have a larger contact surface with the tab 11232 along the third direction during the welding process. As a result, when the floating shaping block 210 floats up and down to float and shape the tab 11232 during the welding process, the force exerted on the tab 11232 by the rolling portion along the third direction not only has a larger contact area but also a smaller rolling friction, making it easier to increase the total length of the tab 11232 that can undergo tensile deformation during the welding process.

[0237] Since the tab 11232 needs to be adjusted after it extends from the battery cell assembly 1123, the following steps are required: Figure 4 The bending and smoothing operation is performed before welding. Therefore, when the floating shaping block 210 floats and abuts against the tab 11232, it needs to be adapted to the bending shape of the tab 11232 to reduce the pressure per unit area of ​​the tab 11232. When the tab 11232 is in the welding machine, the floating shaping block 210 floats up and down, and the inclined first plane 211 can achieve better conformal adaptation with the area of ​​thickness variation of the tab 11232. Figure 4 As shown in the figure, the rolling friction effect achieved by the rolling part of the first rolling group 300a abutting against the tab 11232 is combined with the rolling friction effect achieved by the floating shaping block 210 to greatly reduce the tensile constraint of the tab 11232 during the welding process, ensuring the effective shaping of the tab 11232, greatly reducing the tensile damage of the surface tab 11232 during the welding process, and thus greatly improving the possibility of welding cracking of the tab 11232.

[0238] In the pre-welding state, the floating shaping block 210 can abut against the tab 11232 to be welded, thereby creating a tab 11232 of a certain size between the floating shaping block 210 and the pressure member 120. In the floating shaping state, the floating shaping block 210 can switch back and forth between the abutment and separation states along the first direction relative to the workpiece to be welded, thereby enabling the floating shaping block 210 to effectively perform local longitudinal displacement, thus reducing the frictional and tensile damage of the pressure member 120 to the surface tab 11232, and improving the cracking of the tab 11232.

[0239] By setting a fixed shaping plate 230, which is positioned between the pressure-applying member 120 and the floating shaping block 210 and spaced apart from each other, the fixed shaping plate 230 can intermittently contact the surface tab 11232 when the floating shaping block 210 floats up and down to perform floating shaping on the tab 11232, thereby contacting and damping the tab 11232 and preventing excessive deformation of the tab 11232.

[0240] The welding apparatus 2000 provided in this embodiment is provided with a floating shaping block 210 and a fixed shaping plate 230. When welding the tabs 11232 of the battery cell 1120, the floating shaping block 210 and the fixed shaping plate 230, positioned between the end face of the tab 11232 and the welding area, perform shaping and vibration damping of the tab 11232. Simultaneously, to achieve good shaping and vibration damping effects, the floating shaping block 210 will preferentially contact the tab 11232 before the pressure member 120. During the entire welding process of the multi-layer tabs 11232 by the pressure member 120, the tabs 11232 located in the area between the fixed shaping plate 230 and the solder mark 11233 are in a constrained state. However, due to the high-frequency vibration of the pressure member 120 during ultrasonic welding, the multi-layer tabs 11232 rub against each other, resulting in a softened connection. During the entire welding process, the tabs 11232 in the forming block and the solder mark 11233 area undergo longitudinal displacement, resulting in frictional tensile deformation of the tabs 11232. The surface tabs 11232 experience the greatest deformation, and cracking occurs when the stretch exceeds the tensile strength of the tab 11232 foil. In this application, by making the floating forming block 210 in contact with the tabs 11232 a structure that can float longitudinally, when the welding head stretches the tabs 11232 and moves them longitudinally downwards, the surface tabs 11232 located between the floating forming block 210 and the welding head 110 become taut and straightened. At this time, the floating forming block 210 will undergo upward longitudinal displacement, significantly improving the constraint state of the surface tabs 11232. The deformation of the surface tabs 11232 is then dispersed over a longer distance, reducing stress concentration and tearing, thereby significantly improving the cracking situation of the tabs 11232 during the welding process.

[0241] Secondly, this application also provides a battery production system, which includes the welding apparatus 2000 described in any of the above embodiments. When the battery production system provided in this application is used to weld the tabs 11232 of the battery cell 1120, the pressure member 120 moves along a first direction, and the tabs 11232 located below the pressure member 120 can undergo tensile deformation and welding during the vibration and pressing of the pressure member 120. During the welding process, a shaping component 200 connected to the welding head 110 is provided on the outer periphery of the pressure member 120 along a second direction, and a rolling component 300 is mounted on the shaping component 200. Since the rolling component 300 can rotate around a preset axis, it can roll and abut against the surface tabs 11232. Therefore, during the welding process, the shaping component 200 and the surface tab 11232 are in rolling contact, resulting in rolling friction between them. This reduces frictional force, and the tab 11232 between the rolling component 300 and the pressure-applying component 120 also possesses a certain degree of free deformation capability during welding. This allows the tab 11232 located below the pressure-applying component 120 to transfer a portion of its tensile deformation to the tab 11232 between the rolling component 300 and the pressure-applying component 120 during tensile deformation. This increases the total length of the tab 11232 that can undergo tensile deformation during welding, effectively reducing the deformation per unit area and thus lowering the possibility of cracking during welding. This effectively ensures the current-carrying capacity of the tab 11232 and the charging and discharging capacity of the battery cell 1120, ultimately resulting in higher reliability of the battery cell 1120. Furthermore, during the welding process of the tab 11232, a shaping component 200 connected to the welding head 110 is provided on the outer periphery of the pressure member 120, and the shaping component 200 includes a floating shaping block 210 and a telescopic component. Therefore, the floating shaping block 210 can float up and down along the first direction and roll against the surface tab 11232 through the rolling component 300. During the welding process, the shaping component 200 moves synchronously with the welding head 110, and the tab 11232 between the shaping component 200 and the pressure member 120 can also have a certain degree of free deformation capability during the welding process. This allows the tab 11232 located below the pressure-applying component 120 to transfer a portion of the tensile deformation during the tensile deformation process to the tab 11232 between the shaping component 200 and the pressure-applying component 120. This increases the total length of the tab 11232 that can undergo tensile deformation during the welding process, thereby effectively reducing the amount of deformation borne by the tab 11232 per unit area. This reduces the possibility of the tab 11232 cracking during the welding process, effectively ensuring the current carrying capacity of the tab 11232 and the charging and discharging capacity of the battery cell 1120, ultimately resulting in higher reliability of the battery cell 1120.

[0242] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding apparatus, characterized in that, The welding apparatus includes: Welding assembly (100), comprising: Welding head (110); and A pressure-applying element (120) is disposed on the welding head (110) and is capable of abutting against the workpiece to be welded in a first direction; A shaping assembly (200) is connected to the welding head (110) and spaced apart from the pressure application member (120) along a second direction, the second direction being angled to the first direction; the shaping assembly (200) includes: Floating shaping block (210); and A retractable component (220) is connected to the floating shaping block (210) and can, based on its own retractability, cause the floating shaping block (210) to float up and down along the first direction; and A rolling assembly (300) is disposed on one side of the pressure member (120) along the second direction and mounted on the end of the shaping assembly (200) facing the workpiece to be welded; the rolling assembly (300) is capable of rotating about a preset axis.

2. The welding apparatus according to claim 1, characterized in that, The rolling assembly (300) includes a first rolling group (300a); the first rolling group (300a) is disposed on the side of the floating shaping block (210) away from the retractable member (220).

3. The welding apparatus according to claim 2, characterized in that, The first rolling group (300a) is located at the edge of the floating shaping block (210) along the second direction near the side of the pressure member (120).

4. The welding apparatus according to claim 2, characterized in that, The dimension of the rolling portion in the first rolling group (300a) along the third direction is smaller than the dimension of the floating shaping block (210) along the third direction; and the dimension of the rolling portion in the first rolling group (300a) along the third direction is larger than the dimension of the workpiece to be welded along the third direction. The third direction, the first direction, and the second direction intersect each other in pairs.

5. The welding apparatus according to claim 2, characterized in that, The floating shaping block (210) has a first plane (211) on the side opposite to the telescopic member (220). The first plane (211) is inclined upward from the side near the pressure member (120) toward the side away from the pressure member (120) so as to be able to contact the area of ​​thickness variation in the workpiece to be welded.

6. The welding apparatus according to claim 5, characterized in that, The orthographic projection of the first plane (211) along the first direction along the second direction has a dimension d1 that satisfies the condition: 1mm≤d1≤5mm.

7. The welding apparatus according to claim 5, characterized in that, The surface roughness of the first plane (211) is less than or equal to 0.025 μm.

8. The welding apparatus according to claim 5, characterized in that, The first rolling assembly (300a) is disposed on the outer periphery of the edge of the first plane (211) near the pressure member (120).

9. The welding apparatus according to claim 2, characterized in that, The floating shaping block (210) has a pre-welding state and a floating shaping state compared to the workpiece to be welded; In the pre-welding state, the floating shaping block (210) can abut against the workpiece to be welded; In the floating shaping state, the floating shaping block (210) can switch back and forth between abutting and separating states relative to the workpiece to be welded along the first direction.

10. The welding apparatus according to claim 9, characterized in that, The shaping assembly (200) also includes a fixed shaping plate (230) connected to the welding head (110), the fixed shaping plate (230) being disposed between the pressure member (120) and the floating shaping block (210) and spaced apart from each other.

11. The welding apparatus according to claim 10, characterized in that, The distance d2 between the fixed shaping plate (230) and the floating shaping block (210) along the second direction satisfies the following condition: 0.02mm≤d2≤0.05mm.

12. The welding apparatus according to claim 10, characterized in that, The fixed shaping plate (230) has a fixed shaping surface (231) formed at the end near the side of the workpiece to be welded, and the fixed shaping surface (231) includes at least a partial arc surface structure.

13. The welding apparatus according to claim 12, characterized in that, In the pre-welding state, the floating shaping block (210) abuts against the workpiece to be welded, and the fixed shaping surface (231) separates from the workpiece to be welded.

14. The welding apparatus according to claim 13, characterized in that, In the pre-welding state, along the first direction, the rolling portion in the first rolling group (300a) has a distance between the contact surface of the workpiece to be welded and the fixed shaping surface (231).

15. The welding apparatus according to claim 14, characterized in that, In the pre-welding state, along the first direction, the minimum distance d3 between the rolling portion in the first rolling group (300a) and the lowest contact surface of the workpiece to be welded, and the minimum distance d3 between the rolling portion and the fixed shaping surface (231) satisfies the following condition: 0.5mm≤d3≤1mm.

16. The welding apparatus according to claim 10, characterized in that, The rolling assembly (300) includes a second rolling group (300b); the second rolling group (300b) is disposed on the side of the fixed shaping plate (230) near the workpiece to be welded.

17. The welding apparatus according to claim 16, characterized in that, In the pre-welding state, the first rolling assembly (300a) abuts against the workpiece to be welded, and the second rolling assembly (300b) separates from the workpiece to be welded.

18. The welding apparatus according to claim 17, characterized in that, In the pre-welding state, along the first direction, the minimum distance d4 between the rolling portion of the first rolling group (300a) and the lowest contact surface of the workpiece to be welded, and the minimum distance d4 between the rolling portion and the second rolling group (300b) satisfies the following condition: 0.5mm≤d4≤1mm.

19. The welding apparatus according to claim 1, characterized in that, The shaping assembly (200) further includes a fixed shaping plate (230) connected to the welding head (110), the fixed shaping plate (230) being disposed between the pressure member (120) and the floating shaping block (210) and spaced apart from each other; The rolling assembly (300) includes a second rolling group (300b), which is disposed on the side of the fixed shaping plate (230) near the workpiece to be welded; The floating shaping block (210) has a pre-welding state relative to the workpiece to be welded. In the pre-welding state, the floating shaping block (210) abuts against the workpiece to be welded, and the second rolling assembly (300b) separates from the workpiece to be welded.

20. The welding apparatus according to claim 19, characterized in that, In the pre-welding state, along the first direction, the lowest contact surface of the floating shaping block (210) abutting the workpiece to be welded, and the minimum distance d5 between the second rolling group (300b) and the workpiece to be welded satisfy the following condition: 0.5mm≤d5≤1mm.

21. The welding apparatus according to any one of claims 1-20, characterized in that, The scrolling component (300) includes: A pivot (310) extends along a third direction and is mounted on the shaping assembly (200), wherein the third direction, the first direction, and the second direction intersect each other in pairs; and A rolling element (320) is sleeved on the rotating shaft (310) and is able to rotate relative to the axis of the rotating shaft (310).

22. The welding apparatus according to claim 21, characterized in that, The rolling component (300) includes multiple sets; the multiple sets of the rolling component (300) are spaced apart along the second direction and / or the third direction.

23. The welding apparatus according to any one of claims 1-20, characterized in that, The welding head (110) is constructed with a clearance through hole (112) extending along the first direction. The pressure-applying element (120) extends from the clearance through hole (112).

24. The welding apparatus according to any one of claims 1-20, characterized in that, The pressure-applying component (120) is an ultrasonic welding tooth assembly.

25. A battery production system, characterized in that, The welding apparatus includes any one of claims 1-24.

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