Battery cover plate welding equipment and welding method

Abstract

The invention provides a battery cover plate welding device and method, and the device comprises a fixing ring which is clamped at the connection part of a to-be-welded battery cover plate and a housing; a table body; a feeding transmission mechanism; the fixing mechanism comprises a fixing table and a positioning protection assembly, the positioning protection assembly comprises a positioning plate and a pressing block, a protection through groove is formed in the center of the positioning plate, and the pressing block can abut against the fixing ring; the pressing mechanism comprises a pressing column, and the pressing column can abut against the battery cover plate to be machined; the welding mechanism comprises a welder; and the unlocking mechanism enables the fixing ring to be separated from the welded battery. The fixing ring is arranged at the joint of the battery cover plate and the shell in a sleeving mode for clamping and fixing, the cover plate and the shell are subjected to double positioning and pressing fit in cooperation with the positioning protection assembly and the pressing mechanism, accurate butt joint of the cover plate and the shell in the welding process is effectively guaranteed, the problem of poor welding caused by position deviation is avoided, and the welding quality is improved. And meanwhile, through cooperation of all the structures, the welding quality and production efficiency of battery products are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing, and specifically refers to a battery cover plate welding device and a welding method. Background Art

[0002] In the field of modern battery manufacturing, the quality and performance of a battery largely depend on the integrity of its internal structure and the connection quality between components. Among them, reliably welding the battery cover plate to the housing is a key link in the battery processing process.

[0003] Currently, in the welding process of the battery cover plate and the housing, there are many problems to be solved urgently. First of all, when welding, it is extremely difficult to accurately align the relative positions of the cover plate and the housing. Due to the extremely high dimensional accuracy requirements for the battery cover plate and the housing, even a tiny position deviation may have a significant impact on the welding quality. Existing positioning methods, whether mechanical positioning or manual-assisted positioning, are difficult to meet the high-precision position alignment requirements. This results in poor welding quality such as uneven welds, false welding, and missed welding in the actual welding process. Poor welding quality not only reduces the sealing performance of the battery, making the battery interior vulnerable to the external environment, thereby shortening the service life of the battery, but also may affect the electrical performance of the battery and even pose potential safety hazards.

[0004] Secondly, the battery processing process involves the coordinated operation of multiple mechanisms, such as a positioning mechanism, a welding mechanism, a conveying mechanism, etc. However, at the present stage, the degree of cooperation between the mechanisms is not ideal. The operating speeds and start-stop times of different mechanisms are difficult to accurately synchronize, resulting in the disruption of the coherence of the entire processing flow. For example, the welding mechanism starts working before the positioning mechanism has accurately positioned the cover plate and the housing, or the conveying mechanism transfers the uncompleted welded battery at an inappropriate time. These situations will seriously affect the processing efficiency, increase the production cost, and hinder the large-scale and high-efficiency development of battery production. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problems of low battery welding quality and efficiency in the prior art, and provide a battery cover plate welding device and a welding method.

[0006] To solve the above technical problems, the present invention provides a battery cover welding device, which includes: a fixing ring sleeved on a battery to be welded and clamped at the joint between the battery cover to be welded and the housing; a table body; a feeding and conveying mechanism disposed on the table body; a fixing mechanism. The battery to be processed enters the fixing mechanism through the feeding and conveying mechanism. The fixing mechanism includes a fixing table and a positioning and protecting assembly. Among them, the fixing table is disposed at the discharging end of the feeding and conveying mechanism, and the positioning and protecting assembly is disposed on one side of the fixing table and includes a positioning plate and a pressing block. The positioning plate can move towards / away from the fixing table, and a protecting through groove is provided at the center thereof. The pressing block is connected to the side of the positioning plate facing the fixing table and can abut against the fixing ring; a pressing-down mechanism disposed on the table body, which includes a pressing column that can pass through the protecting through groove and abut against the battery cover to be processed; a welding mechanism including a welding torch that can approach / away from the fixing table; an unlocking mechanism that disengages the fixing ring from the welded battery.

[0007] In an embodiment of the present invention, the feeding and conveying mechanism includes a first feeding module, a first sliding frame, a second feeding module, and a feeding plate. Among them, the first feeding module is disposed on the table body and extends along a first direction. The first sliding frame is slidably connected to the first feeding module. The second feeding module is disposed on the first sliding frame and extends along a second direction. The feeding plate is slidably connected to the second feeding module. The battery to be processed is supported on the feeding plate and moves synchronously with the feeding plate.

[0008] In an embodiment of the present invention, the fixing mechanism further includes a plurality of clamping jaws and an opening and closing driver. The opening and closing driver is disposed inside the fixing table and is connected to the plurality of clamping jaws. A plurality of opening and closing grooves are provided on the top plate of the fixing table, and the plurality of opening and closing grooves are arranged in one-to-one correspondence with the plurality of clamping jaws. The plurality of clamping jaws pass through the opening and closing grooves and are disposed above the fixing table and can move relatively closer / away to clamp / release the battery to be processed.

[0009] In an embodiment of the present invention, the positioning and protecting assembly further includes a first positioning module, a second sliding frame, a second positioning module, and a lifting frame. The first positioning module is disposed on the table body and extends along a first direction. The second sliding frame is slidably connected to the first positioning module. The second positioning module is disposed on the second sliding frame and extends along a third direction. The lifting frame is slidably connected to the second positioning module. The positioning plate is connected to the lifting frame and moves synchronously with the lifting frame.

[0010] In one embodiment of the present invention, the positioning and protection assembly also includes the plurality of protection gas connection nozzles, the plurality of protection gas connection nozzles are all connected to the positioning plate and are arranged around the protection groove, the plurality of protection gas connection nozzles are respectively externally connected to the protector generating device, and are respectively connected to the interior of the protection groove.

[0011] In one embodiment of the present invention, the pressing mechanism also includes a first adjusting module, a third slide and a second adjusting module. The first adjusting module is arranged on the platform and extends along the second direction. The third slide is slidably connected to the first adjusting module. The second adjusting module is arranged on the third slide and extends along the third direction.

[0012] In one embodiment of the present invention, the pressing mechanism also includes a slide plate and an extension member, the slide plate is slidably connected to the second adjustment module, one end of the extension member is connected to the slide plate, and the other end extends toward the fixed platform, the pressing column is arranged at the free end of the extension member, and moves synchronously with the extension member.

[0013] In one embodiment of the present invention, the welding mechanism also includes a bracket, a first welding module, a fourth slide and a second welding module, the bracket is supported on the table, the first welding module is arranged on the top of the bracket and extends along the second direction, the fourth slide is slidably connected to the first welding module, the second welding module is arranged on the fourth slide and extends along the third direction, and the welder is slidably connected to the second welding module.

[0014] In one embodiment of the present invention, the fixing ring includes two ring arms and a bolt, the two ring arms are detachably connected by the bolt, and the unlocking mechanism includes a rotating screwdriver, which can rotate around its central axis and can be inserted into the bolt to detach the fixing ring from the welded battery.

[0015] The present invention also provides a battery cover welding method, which adopts the above-mentioned battery cover welding equipment to perform welding processing on the battery cover and the shell, and comprises: step S1, sleeve a fixing ring on the battery to be welded, and clamp it at the joint between the battery cover and the shell; step S2, transfer the battery to be welded connected with the fixing ring to a fixing table, and fix and clamp it; step S3, press down and fix the fixing ring and the battery cover respectively to limit the relative position of the cover and the shell during welding; step S4, perform welding processing on the joint between the cover and the shell, and complete the welding process after static cooling; step S5, separate the fixing ring from the welded battery to obtain the target battery product after welding.

[0016] The above technical solution of the present invention has the following advantages compared with the prior art: The battery cover plate welding equipment and welding method of the present invention clamp and fix the connection between the battery cover plate and the housing through a fixing ring, and cooperate with a positioning and protection component and a pressing mechanism to perform double positioning and pressing on the cover plate and the housing, effectively ensuring the precise docking of the cover plate and the housing during the welding process, avoiding welding defects caused by position deviation, and having the steps of sleeving a fixing ring on the connection between the battery cover plate and the housing for clamping and fixing, cooperating with a positioning and protection component and a pressing mechanism to perform double positioning and pressing on the cover plate and the housing, effectively ensuring the precise docking of the cover plate and the housing during the welding process, avoiding welding defects caused by position deviation. At the same time, through the coordinated cooperation of a feeding and conveying mechanism, a fixing mechanism, a welding mechanism and an unlocking mechanism, the running coherence and operation efficiency of each processing mechanism are significantly improved, and the welding quality and production efficiency of battery products are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the content of the present invention easier to be clearly understood, the following further describes the present invention in detail according to specific embodiments of the present invention in conjunction with the drawings.

[0018] Figure 1 is a three-dimensional structural schematic diagram of the battery cover plate welding equipment in a preferred embodiment of the present invention; Figure 2 is Figure 1 the top view of the battery cover plate welding equipment shown; Figure 3 is Figure 1 the three-dimensional structural schematic diagram of the feeding and conveying mechanism in the battery cover plate welding equipment shown; Figure 4 is Figure 1 the three-dimensional structural schematic diagram of the fixing table, clamping jaws and opening and closing driver in the battery cover plate welding equipment shown; Figure 5 is Figure 1 the three-dimensional structural schematic diagram of the fixing mechanism in the battery cover plate welding equipment shown; Figure 6 is Figure 1 the three-dimensional structural schematic diagram of the pressing mechanism in the battery cover plate welding equipment shown; Figure 7 is Figure 1 the three-dimensional structural schematic diagram of the welding mechanism in the battery cover plate welding equipment shown; Figure 8 is Figure 2 the enlarged structural schematic diagram at position A in

[0019] Description of the reference numerals in the drawings of the specification: 100, table body; 200, loading and conveying mechanism; 210, first loading module; 220, first carriage; 221, second loading module; 230, loading plate; 300, fixing mechanism; 310, fixing table; 311, top plate; 312, opening and closing groove; 320, clamping jaw; 330, opening and closing driver; 340, positioning and protection component; 341, first positioning module; 342, second carriage; 343, second positioning module; 344, lifting frame; 345, positioning plate; 3451, protection through groove; 346, pressing block; 347, protective gas connection nozzle; 400, pressing-down mechanism; 410, first adjustment module; 420, second carriage; 430, second adjustment module; 440, sliding plate; 450, extension piece; 460, pressing column; 500, welding mechanism; 510, first welding module; 520, fourth carriage; 530, second welding module; 540, welder; 550, bracket; 600, fixing ring; 700, unlocking mechanism; 710, rotary screwdriver; 800, battery to be processed; X, first direction; Y, second direction; Z, third direction. Detailed implementation manners

[0020] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited are not intended to limit the present invention.

[0021] Embodiment 1:

[0022] Refer to Figure 1 and Figure 2As shown in the figure, this embodiment provides a battery cover plate welding device, which includes: a fixing ring 600 sleeved on the battery to be welded and clamped at the joint of the battery cover plate to be welded and the housing; a table body 100; a feeding and conveying mechanism 200 arranged on the table body 100; a fixing mechanism 300. The battery 800 to be processed enters the fixing mechanism 300 through the feeding and conveying mechanism 200. The fixing mechanism 300 includes a fixing table 310 and a positioning and protection component 340. Among them, the fixing table 310 is arranged at the discharging end of the feeding and conveying mechanism 200, and the positioning and protection component 340 is arranged on one side of the fixing table 310. It includes a positioning plate 345 and a pressing block 346. The positioning plate 345 can move towards / away from the fixing table 310, and a protection through groove 3451 is provided at its center. The pressing block 346 is connected to the side of the positioning plate 345 facing the fixing table 310 and can abut against the fixing ring 600; a pressing-down mechanism 400 arranged on the table body 100, which includes a pressing column 460 that can pass through the protection through groove 3451 and abut against the battery cover plate to be processed; a welding mechanism 500 including a welding torch 540 that can approach / away from the fixing table 310; an unlocking mechanism 700 that disengages the fixing ring 600 from the welded battery.

[0023] It should be noted that for the convenience of description, in this embodiment, the extending direction of the feeding and conveying mechanism 200 is defined as the first direction X, the direction perpendicular to the first direction X in the horizontal plane is defined as the second direction Y, and the height direction of this device is defined as the third direction Z. Among them, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs, and the first direction X and the second direction Y are in the same plane.

[0024] In the prior art, there are technical bottlenecks of insufficient positioning accuracy and poor mechanism coordination in the welding link between the cover plate and the housing during the battery manufacturing process. The traditional welding process relies on manual or simple mechanical positioning, and it is difficult to eliminate the tiny displacement between the cover plate and the housing, resulting in uneven weld quality. For example, on a cylindrical lithium battery production line, operators need to repeatedly adjust the position of the workpiece, but due to the error of visual inspection and judgment, it is easy to cause insufficient airtightness after welding. In addition, it is difficult to accurately match the action timing of the positioning mechanism and the welding equipment. Often, when the welding head moves, the workpiece is not completely fixed, leading to the risk of processing interruption or equipment collision, thus increasing the product defect rate.

[0025] Based on this, the present application in this embodiment proposes a battery cover welding device including a fixing ring 600, a frustum 100, a feeding and conveying mechanism 200, a fixing mechanism 300, a pressing mechanism 400, a welding mechanism 500, and an unlocking mechanism 700. The fixing ring 600 is sleeved at the joint of the cover and the housing of the battery to be welded, and an initial positioning reference is established through physical clamping. The frustum 100 serves as the basic platform of the device and integrates various functional modules. The feeding and conveying mechanism 200 realizes automatic battery conveying. The fixing mechanism 300 includes a fixing table 310 and a positioning and protection component 340, and forms double positioning through a movable positioning plate 345 and a pressing block 346. The pressing mechanism 400 is configured with a pressing column 460 to apply continuous pressure to the cover. The welding mechanism 500 performs welding through a welding torch 540 with adjustable distance. The unlocking mechanism 700 releases the constraint of the fixing ring 600.

[0026] The frustum 100 in this embodiment is used to provide an installation and connection platform for other structures. The fixing ring 600 is configured to be realized as a split metal ring structure and forms a closed ring body through bolt connection. Its function is to establish a rigid constraint before welding to prevent radial offset between the cover and the housing. Specifically, any of the fixing rings 600 includes two ring arms and bolts, and the two ring arms are detachably connected through the bolts. Further, the two ring arms in this embodiment refer to annular clamping components formed through a split structure. The split structure design enables the fixing ring 600 to be disassembled without overall removal, thereby reducing interference with the welding part.

[0027] See Figure 3As shown, the loading and conveying mechanism 200 includes a first loading module 210, a first carriage 220, a second loading module 221, and a loading plate 230. Among them, the first loading module 210 is disposed on the table 100 and extends along the first direction X. The first carriage 220 is slidably connected to the first loading module 210. The second loading module 221 is disposed on the first carriage 220 and extends along the second direction Y. The loading plate 230 is slidably connected to the second loading module 221. The battery 800 to be processed is supported on the loading plate 230 and moves synchronously with the loading plate 230. Further, in this embodiment, the battery is conveyed to the fixing table 310 through the loading and conveying mechanism 200. Among them, the first carriage 220 refers to the moving base that carries the second loading module 221, and can be specifically implemented by a sliding platform with a linear guide rail. It moves along the first direction X to form a basic positioning layer. The second loading module 221 refers to the secondary moving track installed on the first carriage 220, and can be specifically implemented by a ball screw drive device. It extends along the second direction Y to form a secondary positioning layer. The loading plate 230 refers to the moving carrier that carries the battery, and can be specifically implemented by a flat plate structure with a vacuum adsorption function. Its sliding connection relationship with the second loading module 221 ensures the precise positioning of the battery in the two-dimensional plane. Based on the above structure, when the first carriage 220 moves along the first direction X, the position of the battery in this axial direction can be adjusted; when the second loading module 221 drives the loading plate 230 to move along the second direction Y, the position deviation of the battery in the vertical direction can be corrected. Through the alternating control of the two-stage modules, the plane coordinate error of the battery is eliminated layer by layer, and finally the precise alignment with the working position of the fixing mechanism 300 is achieved.

[0028] See Figure 4 and Figure 5As shown, the fixing mechanism 300 in this embodiment further includes a plurality of clamping jaws 320 and an opening / closing driver 330. The opening / closing driver 330 is disposed inside the fixing table 310 and is connected to the plurality of clamping jaws 320. The top plate 311 of the fixing table 310 is provided with a plurality of opening / closing slots 312. The plurality of opening / closing slots 312 are arranged in one-to-one correspondence with the plurality of clamping jaws 320. The plurality of clamping jaws 320 are disposed above the fixing table 310 through the opening / closing slots 312 and can move relatively closer to / away from each other to clamp / release the battery 800 to be processed. Specifically, the fixing table 310 is configured to adopt a metal tabletop with pneumatic clamping jaws 320, and the clamping jaws 320 are controlled by the opening / closing driver 330 to clamp the battery housing. The positioning plate 345 is disposed on the top of the fixing table 310, and the diameter of the protective through slot 3451 thereon is slightly larger than the outer diameter of the pressing column 460. The pressing block 346 refers to the positioning component that contacts the fixing ring 600, and specifically can be implemented by a combined structure of a polyurethane buffer pad and a metal base, and the assembly error is absorbed through elastic deformation. The clamping jaw 320 refers to the mechanical component that directly contacts the battery surface to achieve clamping, and specifically can be implemented by a metal fixture with anti-slip patterns, and its shape matches the outer contour of the battery to ensure the maximum contact area. The opening / closing driver 330 is configured as a linear motor or a cylinder structure, and its output end is linked with all the clamping jaws 320 through a linkage mechanism to achieve synchronous movement. The opening / closing slot 312 refers to the through slot structure provided on the top plate 311 of the fixing table 310, and specifically can be implemented by a rectangular or arc-shaped notch, and its width is slightly larger than the cross-sectional dimension of the moving component of the clamping jaw 320 to provide a movement guiding function. Specifically, when the battery 800 to be processed is sent to the fixing table 310 by the feeding and conveying mechanism 200, the opening / closing driver 330 drives all the clamping jaws 320 to move synchronously inward along the trajectory of the opening / closing slot 312 through the internal transmission mechanism, forming a uniform clamping force around the circumference of the battery. Since the plurality of clamping jaws 320 are linked by the same driving source, their movement speeds and displacement amounts are exactly the same, avoiding the battery deflection caused by asynchronous clamping. In the clamping state, the contact surfaces of the clamping jaws 320 form a multi-point symmetric support with the battery housing, eliminating the moment imbalance caused by unilateral pressing. When the battery needs to be released after welding is completed, the opening / closing driver 330 operates in the reverse direction to drive the clamping jaws 320 to move outward synchronously. At this time, the clamping jaws 320 completely withdraw from the battery contact area, ensuring that the battery can be smoothly transferred to the next station. The present invention does not make specific limitations on the specific number and position of the clamping jaws 320.

[0029] In this embodiment, the positioning and protection component 340 further includes a first positioning module 341, a second carriage 342, a second positioning module 343, and a lifting frame 344. The first positioning module 341 is disposed on the table body 100 and extends along the first direction X. The second carriage 342 is slidably connected to the first positioning module 341. The second positioning module 343 is disposed on the second carriage 342 and extends along the third direction Z. The lifting frame 344 is slidably connected to the second positioning module 343. The positioning plate 345 is connected to the lifting frame 344 and moves synchronously with the lifting frame 344. Specifically, the first positioning module 341 refers to a linear drive mechanism that provides horizontal lateral movement, and can specifically be implemented by a combination of a linear guide rail and a servo motor. Its function is to provide the positioning and protection component 340 with the ability to move in the first direction X as a reference. The second carriage 342 refers to a sliding bearing structure connected to the first positioning module 341, and can specifically be implemented by an aluminum alloy frame and a slider assembly. Its function is to expand the movement range of the positioning plate 345 in the first direction X. The second positioning module 343 refers to a linear drive mechanism that provides vertical movement, and can specifically be implemented by a combination of a ball screw and a stepping motor. Its function is to form a three-dimensional adjustment space through the movement dimension in the third direction Z. The lifting frame 344 refers to a vertical movement platform connected to the second positioning module 343, and can specifically be implemented by a rigid bracket and a guide rod structure. Its function is to transfer the vertical movement of the second positioning module 343 to the positioning plate 345.

[0030] Furthermore, the positioning and protection assembly 340 also includes the plurality of protective gas connection nozzles 347, which are all connected to the positioning plate 345 and arranged around the protective groove 3451. The plurality of protective gas connection nozzles 347 are respectively connected to the external protector generator and are respectively connected to the inside of the protective groove 3451. The protective gas connection nozzle 347 refers to an interface device for conveying protective gas, which is used to form a gas protection layer in the welding area. Among them, the protective groove 3451 refers to a through groove structure arranged at the center of the positioning plate 345, which can be specifically implemented in the form of a circular through hole, and its size is adapted to the moving path of the pressing column 460, which is used to make the pressing column 460 penetrate the positioning plate 345 while maintaining the protective gas coverage area. Among them, the protector generator refers to a gas supply device for generating inert gas, which can be specifically implemented by an argon or nitrogen gas storage tank in combination with a pressure reducing valve, and is connected to the protective gas connection nozzle 347 through a hose, and is used to continuously supply the protective gas required for the welding process. Furthermore, multiple shielding gas connection nozzles 347 are distributed in a ring shape or symmetrically around the shielding slot 3451, so that the shielding gas forms a uniform coverage in the contact area between the pressing column 460 and the battery cover. The inside of the shielding slot 3451 is connected to the shielding gas connection nozzle 347 through an air path to ensure that the shielding gas directly acts on the welding work surface. When the pressing column 460 penetrates the shielding slot 3451, the shielding gas forms an air curtain barrier at the edge of the slot to isolate the outside air from entering the welding pool area. Through the continuous supply of shielding gas, the high temperature welding area is always in an inert gas environment to avoid the occurrence of metal oxidation reaction.

[0031] See also Figure 6 As shown, the pressing mechanism 400 also includes a first adjustment module 410, a third slide 420 and a second adjustment module 430. The first adjustment module 410 is arranged on the platform 100 and extends along the second direction Y. The third slide 420 is slidably connected to the first adjustment module 410. The second adjustment module 430 is arranged on the third slide 420 and extends along the third direction Z. The first adjustment module 410 drives the third slide 420 to move along the second direction Y, so that the second adjustment module 430 and the pressing column 460 connected thereto are positioned within the horizontal lateral range. The second adjustment module 430 independently controls the lifting and lowering of the pressing column 460 along the third direction Z to achieve vertical position calibration. Through the coordinated action of two sets of orthogonally arranged adjustment modules, the plane coordinates of the pressing column 460 can be accurately adjusted to align with the protective through groove 3451 to ensure that the axis of the pressing column 460 coincides with the center of the battery cover. When the battery is shifted due to assembly error or specification difference, the two-dimensional adjustment system can compensate for the deviation in real time, so that the pressing column 460 always accurately abuts the cover surface in a vertical posture, avoiding lateral force causing misalignment between the shell and the cover.

[0032] Further, the pressing mechanism 400 further includes a sliding plate 440 and an extension member 450. The sliding plate 440 is slidably connected to the second adjustment module 430. One end of the extension member 450 is connected to the sliding plate 440, and the other end extends toward the fixed table 310. The pressing column 460 is disposed at the free end of the extension member 450 and moves synchronously with the extension member 450. The sliding plate 440 refers to a moving platform mounted on the second adjustment module 430. The extension member 450 refers to a rigid support structure connecting the sliding plate 440 and the pressing column 460, and can be specifically implemented by an L-shaped steel cantilever structure. Its extension direction is perpendicular to the moving direction of the second adjustment module 430, forming a space avoidance structure.

[0033] See Figure 7 As shown, the welding mechanism 500 in this embodiment further includes a bracket 550, a first welding module 510, a fourth carriage 520, and a second welding module 530. The bracket 550 is supported on the table body 100. The first welding module 510 is disposed at the top of the bracket 550 and extends along the second direction Y. The fourth carriage 520 is slidably connected to the first welding module 510. The second welding module 530 is disposed on the fourth carriage 520 and extends along the third direction Z. The welder 540 is slidably connected to the second welding module 530. Among them, the bracket 550 refers to a basic support structure for carrying and fixing the welding mechanism 500, which provides a stable installation reference for subsequent moving parts. Among them, the first welding module 510 refers to a linear motion mechanism extending horizontally in the transverse direction, and can be specifically implemented by a ball screw linear module. It drives the fourth carriage 520 to translate along the second direction Y through a servo motor, forming the transverse motion trajectory of the welder 540 on the horizontal plane. Among them, the fourth carriage 520 refers to a transitional bearing structure connecting the first welding module 510 and the second welding module 530. Its bottom is provided with a slider matching the first welding module 510, and the top reserves an installation interface for the second welding module 530 to realize the mechanical connection of the transverse and longitudinal motion transmission. Among them, the second welding module 530 refers to a linear motion mechanism extending in the vertical direction, and can be specifically implemented by a synchronous belt linear module. It drives the welder 540 to lift along the third direction Z through a stepping motor, forming the precise positioning ability of the welder 540 in the vertical direction.

[0034] Further, based on the above design, the present application can realize the multi-dimensional coordinated movement of the welder 540 in three-dimensional space, ensure that the welded part moves precisely along the preset trajectory, eliminate the welding path deviation caused by insufficient degrees of freedom of movement, effectively improve the welding uniformity at the joint of the cover plate and the housing, and avoid the occurrence of virtual welding or weld misalignment.

[0035] See Figure 8As shown, the unlocking mechanism 700 includes a rotary screwdriver 710. The rotary screwdriver 710 can rotate around its central axis and can penetrate into the bolt to disengage the fixing ring 600 from the welded battery. Further, after welding is completed, the rotary screwdriver 710 moves axially to the position of the bolt head, and the tool tip is aligned with the thread groove or the head structure of the bolt. Subsequently, the rotary screwdriver 710 rotates clockwise or counterclockwise around the central axis, and the bolt is gradually screwed out through thread engagement, so that the connection force between the two ring arms is released. When the bolt is completely disengaged, the two ring arms can be separated under the drive of an external mechanism, thereby releasing the clamping of the connection between the battery cover plate and the housing. The axial feeding action and the rotation action of the rotary screwdriver 710 are coordinated through timing control. For example, it first axially penetrates to a set depth and then starts to rotate to avoid the phenomenon of slipping teeth caused by the tool tip not being fully inserted. The loosening process of the bolt is completed by mechanical drive without manual intervention, ensuring the standardization of the disassembly operation. In some specific embodiments, the tool tip of the rotary screwdriver 710 can be replaced with different specifications to adapt to bolts of different sizes, such as equipped with a cross-shaped, flat-shaped or hexagon socket head type tool tip, and the present invention does not make specific limitations on this.

[0036] Embodiment 2:

[0037] This embodiment provides a method for welding a battery cover plate, which uses the battery cover plate welding device described in Embodiment 1 to perform welding processing on the battery cover plate and the housing, and includes: Step S1: Sleeving the fixing ring on the battery to be welded and clamping it at the connection between the battery cover plate to be welded and the housing; Step S2: Transmitting the battery to be welded with the fixing ring to the fixing table and performing fixed clamping; Step S3: Pressing and fixing the fixing ring and the battery cover plate respectively to limit the relative position of the cover plate and the housing during welding; Step S4: Performing welding processing on the connection between the cover plate and the housing, and completing the welding process after static cooling; Step S5: Disengaging the fixing ring from the welded battery to obtain the welded target battery product.

[0038] In summary, for the battery cover welding equipment and welding method of the present invention, the clamping ring 600 is used to clamp and fix the connection between the battery cover and the housing. In cooperation with the positioning and protection assembly 340 and the pressing mechanism 400, double positioning and pressing of the cover and the housing are performed, effectively ensuring the precise docking of the cover and the housing during the welding process, avoiding welding defects caused by position deviation. It has the clamping and fixing by sleeving the clamping ring 600 on the connection between the battery cover and the housing. In cooperation with the positioning and protection assembly 340 and the pressing mechanism 400, double positioning and pressing of the cover and the housing are performed, effectively ensuring the precise docking of the cover and the housing during the welding process, avoiding welding defects caused by position deviation. At the same time, through the coordinated cooperation of the feeding and conveying mechanism 200, the fixing mechanism 300, the welding mechanism 500, and the unlocking mechanism 700, the running coherence and operation efficiency of each processing mechanism are significantly improved, ensuring the welding quality and production efficiency of battery products.

[0039] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. The obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A battery cover plate welding device, characterized in that: Comprising: A fixed ring, which is sleeved on the battery to be welded and clamped at the joint of the battery cover plate and the housing to be welded; A table body; A feeding and conveying mechanism, which is arranged on the table body; A fixing mechanism. The battery to be processed enters the fixing mechanism through the feeding and conveying mechanism. The fixing mechanism includes a fixing table and a positioning and protection component. Among them, the fixing table is arranged at the discharging end of the feeding and conveying mechanism, and the positioning and protection component is arranged on one side of the fixing table. It includes a positioning plate and a pressing block. The positioning plate can move towards / away from the fixing table, and a protection through groove is provided at its center. The pressing block is connected to the side of the positioning plate facing the fixing table and can abut against the fixed ring; A pressing-down mechanism, which is arranged on the table body and includes a pressing column. The pressing column can pass through the protection through groove and abut against the battery cover plate to be processed; A welding mechanism, which includes a welding torch that can approach / away from the fixing table; An unlocking mechanism, which disengages the fixed ring from the welded battery.

2. The battery cover welding device according to claim 1, characterized in that: The feeding and conveying mechanism includes a first feeding module, a first sliding frame, a second feeding module and a feeding plate. Among them, the first feeding module is arranged on the table body and extends along a first direction. The first sliding frame is slidably connected to the first feeding module. The second feeding module is arranged on the first sliding frame and extends along a second direction. The feeding plate is slidably connected to the second feeding module. The battery to be processed is supported on the feeding plate and moves synchronously with the feeding plate.

3. The battery cover plate welding device according to claim 1, wherein: The fixing mechanism further includes a plurality of clamping jaws and an opening and closing driver. The opening and closing driver is arranged inside the fixing table and is connected to the plurality of clamping jaws. A plurality of opening and closing grooves are provided on the top plate of the fixing table. The plurality of opening and closing grooves are arranged in one-to-one correspondence with the plurality of clamping jaws. The plurality of clamping jaws pass through the opening and closing grooves and are arranged above the fixing table and can relatively approach / away from each other to clamp / release the battery to be processed.

4. The battery cover welding device according to claim 1, characterized in that: The positioning and protection component further includes a first positioning module, a second sliding frame, a second positioning module and a lifting frame. The first positioning module is arranged on the table body and extends along a first direction. The second sliding frame is slidably connected to the first positioning module. The second positioning module is arranged on the second sliding frame and extends along a third direction. The lifting frame is slidably connected to the second positioning module. The positioning plate is connected to the lifting frame and moves synchronously with the lifting frame.

5. The battery cover plate welding device according to claim 1, wherein: The positioning and protection component further includes a plurality of protective gas connecting nozzles. The plurality of protective gas connecting nozzles are all connected to the positioning plate and are arranged around the protection through groove. The plurality of protective gas connecting nozzles are respectively externally connected to a protector generating device and are respectively communicated with the inside of the protection through groove.

6. The battery cover welding device according to claim 1, wherein: The pressing-down mechanism further includes a first adjusting module, a third sliding frame and a second adjusting module. The first adjusting module is arranged on the table body and extends along a second direction. The third sliding frame is slidably connected to the first adjusting module. The second adjusting module is arranged on the third sliding frame and extends along a third direction.

7. The battery cover plate welding device according to claim 6, characterized in that: The pressing mechanism further includes a sliding plate and an extension member. The sliding plate is slidably connected to the second adjustment module. One end of the extension member is connected to the sliding plate, and the other end extends towards the fixed table. The pressing column is disposed at the free end of the extension member and moves synchronously with the extension member.

8. The battery cover plate welding device according to claim 1, characterized in that: The welding mechanism further includes a bracket, a first welding module, a fourth carriage, and a second welding module. The bracket is supported on the table body. The first welding module is disposed at the top of the bracket and extends along a second direction. The fourth carriage is slidably connected to the first welding module. The second welding module is disposed on the fourth carriage and extends along a third direction. The welder is slidably connected to the second welding module.

9. The battery cover plate welding device according to claim 1, wherein: The fixing ring includes two ring arms and a bolt. The two ring arms are detachably connected by the bolt. The unlocking mechanism includes a rotary screwdriver. The rotary screwdriver can rotate around its central axis and can penetrate into the bolt to detach the fixing ring from the welded battery.

10. A method for welding a battery cover plate, characterized in that: Using the battery cover welding device according to any one of claims 1 to 9 for welding the battery cover and the housing, it includes: Step S1: Sleeving the fixing ring on the battery to be welded and clamping it at the joint between the battery cover to be welded and the housing. Step S2: Transmitting the battery to be welded with the fixing ring to the fixed table and performing fixed clamping. Step S3: Pressing and fixing the fixing ring and the battery cover respectively to limit the relative position between the cover and the housing during welding. Step S4: Performing welding on the joint between the cover and the housing, and completing the welding process after static cooling. Step S5: Detaching the fixing ring from the welded battery to obtain the welded target battery product.

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