A top pin crimping type battery cell clamping mechanism and a battery cell shell cover welding device

Abstract

The utility model relates to a kind of top pin crimping type battery cell clamping mechanism and battery cell shell cover welding device, and battery cell clamping mechanism includes battery cell clamping pedestal, battery cell carrier, top pin and top pin power unit;Battery cell carrier is fixed in the battery cell clamping pedestal and is equipped with with battery cell hollow structure coaxial alignment channel, for carrying the battery cell with the connecting piece of end connection;Top pin can be axially moved and penetrate the alignment channel, and its execution end is equipped with the crimping working surface for crimping connecting piece;Top pin power unit drives the axial motion of top pin relative to battery cell carrier.The utility model can improve the adhesion of connecting piece and shell cover contact surface, significantly improve welding quality and battery performance.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a pin-pressing battery cell clamping mechanism and a battery cell and casing welding device for assembling cylindrical battery cells and casings. Background Technology

[0002] In the manufacturing process of cylindrical lithium batteries, the assembly of the cell and the casing requires precisely pressing the connecting tabs at the end of the cell to the designated area of ​​the casing, as shown in the attached figure. Figure 5 As shown, the assembly to be assembled consists of a cylindrical battery cell Z1, a battery cell connecting piece Z2, and a casing Z3. The cylindrical battery cell has a hollow structure, with its hollow portion being a cylindrical cavity. The connecting piece is fixed to the end surface of the battery cell. During assembly, it is necessary to ensure that the connecting piece on the upper surface of the battery cell is tightly fitted to the casing for subsequent welding processes. However, in production, it has been found that traditional clamping mechanisms struggle to achieve a full fit between the connecting piece and the casing, resulting in small gaps between them. This not only reduces welding yield but may also lead to safety hazards such as battery leakage and increased internal resistance. Therefore, a clamping mechanism that can ensure a tight fit between the connecting piece and the casing is urgently needed. Utility Model Content

[0003] In view of this, the present invention provides a pin-pressing cell clamping mechanism, which can improve the fit between the connecting piece and the shell cover, and significantly improve the welding quality and battery performance.

[0004] The objective of this utility model is achieved through the following technical solution: A pin-pressing battery cell clamping mechanism includes a battery cell clamping base, a battery cell carrier, a pin, and a pin power unit. The battery cell carrier is fixed to the battery cell clamping base and has an alignment channel coaxial with the hollow structure of the battery cell for supporting a battery cell with a connecting piece connected to its end. The pin can move axially through the alignment channel, and its actuating end has a pressing working surface for pressing the connecting piece. The pin power unit drives the pin to move axially relative to the battery cell carrier.

[0005] By coordinating the alignment channel of the cell carrier with the axial movement of the ejector pin, triple positioning control of the cell connecting piece is achieved: First, the coaxial design of the alignment channel and the hollow structure of the cell ensures the radial positioning accuracy of the cell, avoiding positional displacement of the connecting piece due to skewness; second, the axial movement path of the ejector pin coincides with the axial direction of the cell, allowing the pressing surface to accurately contact the surface of the connecting piece along a preset trajectory; third, the linear driving force provided by the ejector pin power unit can precisely control the pressing force, ensuring uniform pressing of the connecting piece and the shell cover contact surface while preventing deformation of the thin connecting piece due to excessive pressure. This structure effectively improves the problem of incomplete welding caused by positioning deviation in traditional clamping mechanisms, and is especially suitable for the high-precision assembly requirements of hollow structure cells. The rigid fit of the mechanical structure significantly improves the flatness and conductivity of the welding joint surface, providing ideal interface conditions for subsequent laser welding processes, improving the consistency of welding penetration, and effectively reducing battery internal resistance fluctuations.

[0006] Preferably, it further includes a first pressure detection unit, a displacement monitoring unit, and a controller. The first pressure detection unit detects the contact pressure between the ejector pin and the connecting piece; the displacement monitoring unit is used to detect the axial displacement of the ejector pin; the signal input terminal of the controller is connected to the first pressure detection unit and the displacement monitoring unit respectively, and its command output terminal is connected to the ejector pin power unit.

[0007] The added pressure-displacement dual feedback system forms a complete closed loop for process control: the first pressure detection unit monitors the contact pressure between the ejector pin and the connecting piece in real time, and can dynamically adjust the output parameters of the ejector pin power unit to avoid uneven pressure distribution caused by uneven surface or material differences of the connecting piece; the displacement monitoring unit accurately records the ejector pin stroke trajectory, and can identify abnormal displacement deviations during assembly by comparing and analyzing with the preset displacement curve. The controller, by integrating pressure and displacement signals, can implement multiple control strategies: a low-speed displacement mode is used in the initial contact stage to ensure soft contact; constant pressure control is switched in the pressing stage to maintain stable contact force; and position locking is used in the final position to ensure the pressing state is maintained. This intelligent control mechanism not only effectively prevents plastic deformation of the connecting piece caused by overpressure, but also compensates for assembly errors caused by cell size tolerances, making it particularly suitable for flexible production of multiple cell models. Digital recording and analysis of process parameters provide reliable data support for process optimization, significantly improving product yield.

[0008] Preferably, the assembly further includes a cover pressing assembly and a second pressure detection unit. The cover pressing assembly includes a cover top plate and a base driving unit. The cover top plate is configured to abut against the cover to be assembled. The base driving unit is connected to the cell clamping base and is used to drive the cell carrier to carry the cell to the cover top plate so that the cell is in close contact with the cover. The ejector pin is configured to carry the connecting piece to the cover top plate under the drive of the ejector pin power unit so that the connecting piece is in close contact with the cover. The second pressure detection unit detects the clamping force between the cell carrier and the cell. The controller signal input terminal is connected to the second pressure detection unit, and its command output terminal is connected to the base driving unit.

[0009] The innovatively designed top-pressing assembly and dual-pressure detection system work together to construct a multi-dimensional assembly force control system: when the base drive unit pushes the entire cell towards the top plate of the top plate, the second pressure detection unit monitors the pressing force between the cell carrier and the cell body in real time, avoiding damage to the internal structure of the cell due to excessive tightness in assembly; at the same time, the ejector pin system independently controls the pressing force of the connecting piece, ensuring that the interface contact quality is not affected by the assembly force of the cell body. This decoupled control method solves the technical problem of mutual interference between the pressure of the cell body and the pressure of the connecting piece in traditional assembly processes, enabling both the cell shell and the connecting piece to achieve the best pressing effect. The rigid support design of the top plate of the top plate provides a stable reaction force for the welding process, effectively suppressing the impact of vibration on assembly accuracy. The controller's multi-channel signal processing capability enables time-series coordinated control of the two pressure systems. For example, a step-by-step operation process can be set to complete the positioning of the cell body first and then perform the pressing of the connecting piece, significantly reducing the risk of stress accumulation during the assembly process.

[0010] Preferably, it also includes a base, wherein the cell clamping base is movably mounted on the base via a linear guide rail, and the base driving unit is a linear drive mechanism installed between the base and the cell clamping base.

[0011] The combined design of linear guides and a linear drive mechanism provides the battery cell clamping base with high-precision linear motion capability: the guiding effect of the linear guides eliminates radial wobble during the movement of the battery cell carrier, ensuring that the battery cell axis is perpendicular to the plane of the top plate of the casing; the linear drive mechanism (such as a servo cylinder or ball screw module) precisely controls the moving speed and displacement of the battery cell clamping base through a controller, achieving a gradual fit between the battery cell and the casing. This structure, through a rigid force transmission path design, directly transmits the output force of the base drive unit to the battery cell clamping base, reducing energy loss in intermediate transmission links and improving drive efficiency; the low-friction characteristics of the linear guides avoid the jamming problem of traditional sliding guides, ensuring stability during long-term operation. In addition, the base, as an overall load-bearing frame, provides an installation benchmark for the battery cell clamping base and the casing top pressing assembly, ensuring the relative positional accuracy between components and reducing assembly errors caused by structural deformation.

[0012] Preferably, the ejector pin power unit is a servo electric cylinder or a pneumatic-hydraulic booster cylinder, and its output end is rigidly connected to the ejector pin through a connector.

[0013] The choice between servo electric cylinders and pneumatic-hydraulic booster cylinders balances the need for high-precision control and high-thrust output: servo electric cylinders, driven by servo motors, can precisely control the displacement and speed of the ejector pin, suitable for precision assembly scenarios requiring fine-tuning of the pressing force; pneumatic-hydraulic booster cylinders utilize the principle of gas-hydraulic conversion to provide stable thrust, suitable for rapid pressing operations under high-load conditions. The use of connecting components ensures that the output force of the ejector pin power unit is transmitted to the ejector pin without delay, avoiding displacement lag caused by elastic deformation; simultaneously, the rigid connection structure can withstand the impact loads generated during pressing, improving system durability. This design reduces force loss in intermediate links and improves energy utilization through a direct force transmission path between the power unit and the ejector pin; the modular connection method facilitates quick replacement of the ejector pin assembly, adapting to the pressing requirements of different specifications of connecting plates.

[0014] Preferably, the connector has an axially extending detection protrusion on its outer periphery, and the displacement monitoring unit includes a grating sensor arranged parallel to the detection protrusion, which generates a displacement feedback signal for the ejector pin assembly by recognizing the displacement mark of the detection protrusion.

[0015] This non-contact measurement scheme using a detection ridge and grating sensor avoids the mechanical wear problems of traditional contact displacement sensors. The detection ridge extends axially along the connector, and its surface features equidistant reflective marks or magnetic codes that, in conjunction with the reading head of the grating sensor, can capture the absolute displacement of the ejector pin in real time. The high-resolution characteristics of the grating sensor (such as micron-level accuracy), combined with an anti-interference design, ensure stable acquisition of displacement signals under high-speed motion or vibration environments. This structure integrates the displacement detection unit with the power output mechanism, reducing the installation space requirements of additional detection devices. The axial arrangement of the detection ridge is consistent with the ejector pin's movement trajectory, eliminating detection errors caused by measurement reference offset. By directly monitoring the displacement of the connector rather than indirect calculation, the actual position of the ejector pin can be accurately reflected, avoiding the impact of transmission chain error accumulation on control accuracy. The generated displacement feedback signal and pressure detection data form multi-dimensional control parameters, providing the controller with more comprehensive operating condition information and optimizing the adaptive adjustment capability of the pressing process.

[0016] A battery cell casing welding device includes the aforementioned pin-pressing battery cell clamping mechanism, a welding machine, and a casing clamping assembly. The welding gun working end of the welding machine is aligned with the joint area between the casing and the connecting piece. The casing clamping assembly includes a casing clamping base, multiple abutment posts, a push rod assembly, and a clamping drive unit. The casing clamping base and the battery cell clamping base are orthogonally arranged to form an axial assembly channel between the casing and the battery cell, and are provided with at least one casing groove for accommodating the casing. The multiple abutment posts are fixedly disposed on the first side of the casing groove. The push rod assembly includes a push rod slidably disposed on the casing clamping base and at least one abutment block linked with the push rod. The clamping drive unit is installed on the casing clamping base and drivenly connected to the push rod, for driving the abutment block to move to the second side of the casing groove, so that the abutment block and the abutment posts cooperate to clamp the casing.

[0017] The orthogonally arranged clamping base design enables axial alignment and assembly of the battery cell and casing: the casing clamping base and the battery cell clamping base form an L-shaped layout, with the axis of the casing groove perpendicularly intersecting the alignment channel of the battery cell clamping mechanism, ensuring precise alignment of the casing and the battery cell end face; the collaborative clamping mechanism of fixed abutment posts and movable abutment blocks can adapt to the rapid positioning needs of casings of different sizes. The welding gun of the welding machine is designed to align with the joining area, allowing welding operations to be performed immediately after the clamping mechanism completes the pressing of the battery cell and casing, forming a continuous production process; the multi-station casing groove design of the casing clamping assembly (such as single-station or multi-station matrix arrangement) supports batch production or mixed-flow operation of different casing models. The linkage design of the push rod assembly controls the synchronous movement of multiple abutment blocks through a single drive unit, simplifying the complexity of the clamping action; the clamping surfaces of the abutment posts and abutment blocks can be configured with flexible materials or contoured structures to avoid damage to the casing surface during clamping. This device integrates clamping and welding functions, significantly shortening the production cycle and improving the assembly and welding efficiency of battery cell casing components.

[0018] Preferably, the clamping drive unit is a linear cylinder, whose piston rod is rigidly connected to the push rod through a connecting block, and the abutment blocks are arranged at equal intervals at the drive end of the push rod.

[0019] The adoption of a linear cylinder drive system enables rapid response in the housing clamping action: the linear cylinder, controlled by a solenoid valve, can instantly output a large thrust, driving the push rod and abutment blocks to quickly complete the clamping or releasing action, shortening non-welding time; the rigid connection design of the piston rod and push rod (such as threaded fastening or welding) ensures lossless transmission of driving force, avoiding insufficient clamping force due to elastic deformation. The evenly spaced abutment block design ensures that the clamping force is evenly distributed to both sides of the housing, preventing housing deformation caused by stress concentration at a single point; the linear motion trajectory of the push rod is parallel to the housing groove axis, ensuring that the abutment blocks maintain perpendicular contact with the housing sidewall during movement, avoiding positioning offset caused by oblique force components. This structure, through modular design, allows adjustment of the abutment block spacing or number according to the housing size, improving the equipment's flexible production capabilities; the low maintenance cost and high reliability of the linear cylinder make it particularly suitable for long-term continuous operation requirements in industrial settings.

[0020] Preferably, the shell cover groove is a groove structure arranged in a multi-station matrix, and a number of abutment posts are provided on the first side of the shell cover groove, and a movable abutment block is provided on the second side.

[0021] The multi-station matrix arrangement of the cover slot design significantly improves production efficiency: multiple covers can be positioned and clamped in a single clamping operation, enabling continuous operation in conjunction with an automated loading and unloading system; the geometry of the groove structure matches the outer contour of the cover, providing a radial positioning reference and eliminating rotational freedom during cover placement. The symmetrical arrangement of fixed abutment posts and movable abutment blocks creates bidirectional constraints on the cover: the fixed abutment posts serve as a reference positioning surface, determining the initial position of the cover; the movable abutment blocks apply a controllable clamping force to the cover under the action of the drive unit, ensuring clamping stability while preventing overpressure damage. This design simplifies the complexity of the clamping mechanism through single-sided drive, while utilizing the matrix arrangement of stations to achieve a high-density layout, maximizing the use of equipment space; the combined clamping method of abutment posts and blocks can adapt to irregular structures on the cover surface (such as lugs or grooves), improving clamping compatibility.

[0022] Preferably, the welding machine is a laser welding machine, and its optical lens is mounted above the welding station via a three-dimensional adjustment frame.

[0023] The application of laser welding technology significantly improves welding quality and efficiency: the high-energy-density laser beam enables instantaneous fusion of the casing and connecting piece, resulting in narrow and deep welds with a small heat-affected zone, avoiding deformation problems caused by traditional arc welding; the three-dimensional adjustment frame supports precise displacement of the optical lens in the X / Y / Z axes, allowing flexible adjustment of the welding path and focal point to adapt to different joint types (such as lap or butt joints). The non-contact welding characteristics of the optical lens avoid mechanical interference between the welding torch and the workpiece, making it particularly suitable for welding complex spatial structures; through preset welding programs, it can automatically complete circumferential welds, straight welds, or multi-point welding tasks, ensuring the consistency of the welding trajectory. The high-rigidity structural design of the three-dimensional adjustment frame ensures the positioning accuracy of the optical lens during high-speed movement; the closed-loop feedback system corrects the lens position in real time, compensating for thermal deformation or mechanical errors, and improving the reliability of the welding process. This solution achieves high-quality sealing welding through precise control of process parameters (such as power, frequency, and scanning speed), meeting the airtightness requirements of the battery cell casing.

[0024] Preferably, it also includes a visual positioning system, comprising a CCD camera positioned above the welding station and an image processing module connected to the controller, for identifying the alignment status of the cover and the connecting piece.

[0025] The introduction of a vision positioning system enables precise alignment detection before welding: a CCD camera captures real-time images of the cover and connecting piece, and the image processing module extracts feature points (such as edge contours and positioning holes), calculates the positional deviation between the two, and feeds it back to the controller; the controller then adjusts the motion parameters of the clamping mechanism or welding machine accordingly to ensure precise alignment of the joining area. The system's non-contact measurement characteristics avoid physical damage to the workpiece and support high-speed online inspection; multi-source illumination schemes (such as ring LEDs or coaxial lights) optimize image contrast and adapt to workpieces with different surface reflectivity. The image processing module uses edge detection, template matching, and other algorithms, combined with calibration parameters, to convert pixel coordinates into mechanical coordinates, improving positioning accuracy; historical data recording functionality allows for statistical analysis of alignment deviation trends, providing a basis for process optimization. The closed-loop control of the vision positioning system, clamping mechanism, and welding machine forms a complete intelligent welding production line, significantly reducing the need for manual intervention and improving product qualification rate.

[0026] The advantages of this utility model compared to the prior art are: By coordinating the alignment channel of the cell carrier with the axial movement of the ejector pin, triple positioning control of the cell connector is achieved. Specifically, the coaxial design of the alignment channel and the hollow structure of the cell ensures the radial positioning accuracy of the cell; the axial movement path of the ejector pin coincides with the axial direction of the cell, ensuring that the pressing surface accurately contacts the connector; and the ejector pin power unit precisely controls the pressing force, ensuring a good fit between the connector and the casing and preventing deformation of the connector. This comprehensive positioning control effectively improves the problem of incomplete welding caused by positioning deviation in traditional clamping mechanisms, significantly improving the flatness and conductivity of the welded joint surface. The flat welded joint surface provides ideal interface conditions for subsequent laser welding processes, effectively reducing battery internal resistance fluctuations, thereby improving the overall performance and stability of the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural diagram of a battery cell casing welding device according to an embodiment of the present invention.

[0029] Figure 2 This is a structural diagram of a pin-pressing battery cell clamping mechanism according to an embodiment of the present invention.

[0030] Figure 3 for Figure 2 A magnified view of region A in the middle.

[0031] Figure 4 This is a structural diagram of a shell and cover clamping assembly according to an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the assembly structure consisting of a battery cell, a connecting piece, and a shell cover according to an embodiment of the present invention.

[0033] Labeling Explanation: Battery Cell - Z1, Connecting Plate - Z2, Shell Cover - Z3, Ejector Pin Press-Type Battery Cell Clamping Mechanism - 1, Battery Cell Clamping Base - 11, Battery Cell Carrier - 12, Alignment Channel - 121, Ejector Pin - 13, Press-Firing Working Surface - 131, Ejector Pin Power Unit - 14, Connector - 141, Detection Protrusion - 1411, First Pressure Detection Unit - 15, Displacement Monitoring Unit - 16, Grating Sensor - 16 1. Second pressure detection unit - 17. Shell cover top pressure assembly - 18. Shell cover top plate - 181. Base drive unit - 182. Base - 19. Linear guide rail - 191. Shell cover clamping assembly - 2. Shell cover clamping base - 21. Shell cover groove - 22. Abutment post - 23. Push rod assembly - 24. Push rod - 241. Abutment block - 242. Clamping drive unit - 25. Piston rod - 251. Connecting block - 252. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not 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 this application.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0038] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0039] This embodiment provides a battery cell casing welding device for processing the attached... Figure 5 The image shows a component to be assembled, consisting of a battery cell Z1, a connecting piece Z2, and a casing Z3. The battery cell / casing / welding device includes a pin-press type battery cell clamping mechanism 1, a welding machine, and a casing / casing / welding assembly 2. The welding torch of the welding machine is aligned with the mating area between the casing / casing and the connecting piece. The casing / casing / welding assembly 2 includes a casing / casing / welding base 21, multiple abutment posts 23, a push rod assembly 24, and a clamping drive unit 25. The casing / casing / welding base 21 is orthogonally arranged to the battery cell clamping base 11, forming an axial assembly channel between the casing / casing and the battery cell. It is provided with at least one [unclear - possibly a device for accommodating the casing / casing]. The cover groove 22; a plurality of abutment posts 23 are fixedly disposed on the first side of the cover groove 22; the push rod assembly 24 includes a push rod 241 slidably disposed on the cover clamping base 21 and at least one abutment block 242 linked with the push rod 241; the clamping drive unit 25 is installed on the cover clamping base 21 and drivenly connected to the push rod 241, for driving the abutment block 242 to move to the second side of the cover groove 22, so that the abutment block 242 and the abutment posts 23 cooperate to clamp the cover.

[0040] The orthogonally arranged clamping base design enables axial alignment and assembly of the battery cell and the casing: the casing clamping base 21 and the battery cell clamping base 11 form an L-shaped layout, and the axis of the casing groove 22 intersects perpendicularly with the alignment channel 121 of the battery cell clamping mechanism 1, ensuring precise alignment of the casing and the battery cell end face; the cooperative clamping mechanism of the fixed abutment post 23 and the movable abutment block 242 can adapt to the rapid positioning requirements of casings of different sizes. The design of the welding gun of the welding machine aligning with the joining area allows welding operations to be performed immediately after the clamping mechanism completes the pressing of the battery cell and the casing, forming a continuous production process; the multi-station casing groove 22 design of the casing clamping assembly 2, such as single-station or multi-station matrix arrangement, supports batch production or mixed-flow operation of different models of casings. The linkage design of the push rod assembly 24 controls the synchronous movement of multiple abutment blocks 242 through a single drive unit, simplifying the complexity of the clamping action. The clamping surfaces of the abutment post 23 and the abutment block 242 can be configured with flexible materials or contoured structures to avoid damage to the shell surface during clamping. By integrating clamping and welding functions, this device significantly shortens the production cycle and improves the assembly and welding efficiency of the battery cell shell assembly.

[0041] The ejector pin pressing type battery cell clamping mechanism 1 includes a battery cell clamping base 11, a battery cell carrier 12, an ejector pin 13, and an ejector pin power unit 14. The battery cell carrier 12 is fixed to the battery cell clamping base 11 and has an alignment channel 121 coaxial with the hollow structure of the battery cell for carrying a battery cell with a connecting piece connected to its end. The ejector pin 13 can move axially through the alignment channel 121, and its execution end has a pressing working surface 131 for pressing the connecting piece. The ejector pin power unit 14 drives the ejector pin 13 to move axially relative to the battery cell carrier 12.

[0042] The alignment channel 121 of the cell carrier 12 and the axial movement of the ejector pin 13 achieve triple positioning control of the cell connecting piece: First, the coaxial design of the alignment channel 121 and the hollow structure of the cell ensures the radial positioning accuracy of the cell, avoiding positional displacement of the connecting piece due to skewness; second, the axial movement path of the ejector pin 13 coincides with the axial direction of the cell, enabling the pressing working surface 131 to accurately contact the surface of the connecting piece along a preset trajectory; third, the linear driving force provided by the ejector pin power unit 14 can precisely control the pressing force, ensuring uniform pressing of the connecting piece and the shell cover contact surface, and preventing deformation of the thin connecting piece due to excessive pressure. This structure effectively improves the problem of incomplete welding caused by positioning deviation in traditional clamping mechanisms, and is especially suitable for the high-precision assembly requirements of hollow structure cells. The rigid fit of the mechanical structure significantly improves the flatness and conductivity of the welding joint surface, providing ideal interface conditions for subsequent laser welding processes, improving the consistency of welding penetration, and effectively reducing battery internal resistance fluctuations.

[0043] In this embodiment, a first pressure detection unit 15, a displacement monitoring unit 16, and a controller are also included. The first pressure detection unit 15 detects the contact pressure between the ejector pin 13 and the connecting piece. The displacement monitoring unit 16 is used to detect the axial displacement of the ejector pin 13. The signal input terminal of the controller is connected to the first pressure detection unit 15 and the displacement monitoring unit 16 respectively, and its command output terminal is connected to the ejector pin power unit 14.

[0044] The added pressure-displacement dual feedback system forms a complete closed loop for process control: the first pressure detection unit 15 monitors the contact pressure between the ejector pin 13 and the connecting piece in real time, and can dynamically adjust the output parameters of the ejector pin power unit 14 to avoid uneven pressure distribution caused by uneven surface or material differences of the connecting piece; the displacement monitoring unit 16 accurately records the stroke trajectory of the ejector pin 13, and can identify abnormal displacement deviations during assembly by comparing and analyzing with the preset displacement curve. The controller can realize multiple control strategies by integrating pressure and displacement dual parameter signals: a low-speed displacement mode is used in the initial contact stage to ensure soft contact, a constant pressure control is switched in the pressing stage to maintain stable contact force, and a position lock is used in the final position to ensure the pressing state is maintained. This intelligent control mechanism not only effectively prevents plastic deformation of the connecting piece caused by overpressure, but also compensates for assembly errors caused by cell size tolerances, and is particularly suitable for flexible production of multiple cell models. Through digital recording and analysis of process parameters, reliable data support is provided for process optimization, resulting in a significant improvement in product qualification rate.

[0045] Coaxial positioning: The alignment channel of the battery cell carrier is coaxial with the hollow structure of the battery cell, ensuring that the ejector pin moves along the battery cell axis; Displacement closed-loop control: The controller compares the actual displacement of the ejector pin with the preset value to compensate for mechanical errors; Dynamic adjustment: When the pressure or displacement exceeds the threshold, the controller adjusts the ejector pin speed or stroke in real time.

[0046] In this embodiment, a cover pressing assembly 18 and a second pressure detection unit 17 are also included. The cover pressing assembly 18 includes a cover top plate 181 and a base driving unit 182. The cover top plate 181 is configured to abut against the cover to be assembled. The base driving unit 182 is connected to the cell clamping base 11 and is used to drive the cell carrier 12 to carry the cell to the cover top plate 181 so that the cell is in close contact with the cover. The ejector pin 13 is configured to carry the connecting piece to the cover top plate 181 under the drive of the ejector pin power unit 14 so that the connecting piece is in close contact with the cover. The second pressure detection unit 17 detects the clamping force between the cell carrier 12 and the cell. The controller signal input terminal is connected to the second pressure detection unit 17, and its command output terminal is connected to the base driving unit 182.

[0047] The innovatively designed top-pressing assembly 18, working in conjunction with a dual-pressure detection system, constructs a multi-dimensional assembly force control system: when the base drive unit 182 pushes the entire battery cell towards the top plate 181 of the top plate, the second pressure detection unit 17 monitors the pressing force between the battery cell carrier 12 and the battery cell body in real time, preventing damage to the internal structure of the battery cell due to excessive tightness in assembly; simultaneously, the ejector pin system independently controls the pressing force of the connecting piece, ensuring that the interface contact quality is not affected by the assembly force of the battery cell body. This decoupled control method solves the technical problem of mutual interference between the pressure of the battery cell body and the pressure of the connecting piece in traditional assembly processes, enabling both the battery cell shell and the connecting piece to achieve the best pressing effect. The rigid support design of the top plate 181 of the top plate provides a stable reaction force for the welding process, effectively suppressing the impact of vibration on assembly accuracy. The controller's multi-channel signal processing capability enables time-series coordinated control of the two pressure systems. For example, a step-by-step operation process can be set to complete the positioning of the battery cell body first and then perform the pressing of the connecting piece, significantly reducing the risk of stress accumulation during the assembly process.

[0048] In this embodiment, a base 19 is also included. The cell clamping base 11 is movably mounted on the base 19 via a linear guide rail 191. The base driving unit 182 is a linear driving mechanism installed between the base 19 and the cell clamping base 11.

[0049] The combined design of the linear guide rail 191 and the linear drive mechanism provides the battery cell clamping base 11 with high-precision linear motion capability: the guiding effect of the linear guide rail 191 eliminates radial swaying during the movement of the battery cell carrier 12, ensuring that the battery cell axis is perpendicular to the plane of the top plate 181 of the housing cover; the linear drive mechanism, such as a servo cylinder or ball screw module, precisely controls the moving speed and displacement of the battery cell clamping base 11 through a controller, achieving a gradual fit between the battery cell and the housing cover. This structure, through a rigid force transmission path design, directly transmits the output force of the base drive unit 182 to the battery cell clamping base 11, reducing energy loss in intermediate transmission links and improving drive efficiency; the low friction characteristics of the linear guide rail 191 avoid the jamming problem of traditional sliding guide rails, ensuring stability during long-term operation. In addition, the base 19, as an overall load-bearing frame, provides an installation reference for the battery cell clamping base 11 and the housing cover pressing assembly 18, ensuring the relative positional accuracy between the components and reducing assembly errors caused by structural deformation.

[0050] In this embodiment, the ejector power unit 14 is a servo electric cylinder or a pneumatic-hydraulic booster cylinder, and its output end is rigidly connected to the ejector 13 through a connector.

[0051] The choice between a servo electric cylinder and a pneumatic-hydraulic booster cylinder balances the requirements of high-precision control and high-thrust output: the servo electric cylinder, driven by a servo motor, can precisely control the displacement and speed of the ejector pin 13, suitable for precision assembly scenarios requiring fine-tuning of the pressing force; the pneumatic-hydraulic booster cylinder utilizes the principle of gas-hydraulic conversion to provide stable thrust, suitable for rapid pressing operations under high-load conditions. The use of connector 141 ensures that the output force of the ejector pin power unit 14 is transmitted to the ejector pin 13 without delay, avoiding displacement lag caused by elastic deformation; at the same time, the rigid connection structure can withstand the impact load generated during the pressing process, improving system durability. This design reduces force loss in intermediate links and improves energy utilization through the direct force transmission path between the power unit and the ejector pin 13; the modular connection method facilitates quick replacement of the ejector pin assembly and adapts to the pressing requirements of different specifications of connecting pieces.

[0052] In this embodiment, the connector 141 has an axially extending detection protrusion 1411 on its outer periphery, and the displacement monitoring unit 16 includes a grating sensor 161 arranged parallel to the detection protrusion 1411. The sensor generates a displacement feedback signal of the ejector pin assembly by recognizing the displacement mark of the detection protrusion 1411.

[0053] The non-contact measurement scheme of the detection ridge 1411 and the grating sensor 161 avoids the mechanical wear problem of traditional contact displacement sensors. The detection ridge 1411 extends axially along the connector 141, and its surface is provided with equidistant reflective marks or magnetic codes, which, in conjunction with the reading head of the grating sensor 161, can capture the absolute displacement of the ejector pin 13 in real time. The high-resolution characteristics of the grating sensor 161, such as micron-level precision, combined with anti-interference design, ensure stable acquisition of displacement signals in high-speed motion or vibration environments. This structure integrates the displacement detection unit 16 with the power output mechanism, reducing the installation space requirements of additional detection devices. The axial arrangement of the detection ridge 1411 is consistent with the movement trajectory of the ejector pin 13, eliminating detection errors caused by measurement reference offset. By directly monitoring the displacement of the connector 141 rather than indirect calculation, the actual position of the ejector pin 13 can be accurately reflected, avoiding the impact of transmission chain error accumulation on control accuracy. The generated displacement feedback signal and pressure detection data form multi-dimensional control parameters, providing the controller with more comprehensive operating condition information and optimizing the adaptive adjustment capability of the pressing process.

[0054] In this embodiment, the clamping drive unit 25 is a linear cylinder, and its piston rod 251 is rigidly connected to the push rod 241 through the connecting block 252. The abutment blocks 242 are arranged at equal intervals at the drive end of the push rod 241.

[0055] The adoption of a linear cylinder drive system enables rapid response in the housing clamping action: the linear cylinder, controlled by a solenoid valve, can instantly output a large thrust, driving the push rod 241 and the abutment block 242 to quickly complete the clamping or releasing action, shortening non-welding time; the rigid connection design between the piston rod 251 and the push rod 241, such as threaded fastening or welding, ensures lossless transmission of driving force and avoids insufficient clamping force due to elastic deformation. The evenly spaced abutment blocks 242 design distributes the clamping force evenly to both sides of the housing, preventing housing deformation caused by stress concentration at a single point; the linear motion trajectory of the push rod 241 is parallel to the axis of the housing groove 22, ensuring that the abutment blocks 242 maintain perpendicular contact with the side wall of the housing during movement, avoiding positioning offset caused by oblique force components. This structure, through modular design, allows adjustment of the spacing or number of abutment blocks 242 according to the housing size, improving the equipment's flexible production capabilities; the low maintenance cost and high reliability of the linear cylinder make it particularly suitable for long-term continuous operation requirements in industrial settings.

[0056] In this embodiment, the shell cover groove 22 is a groove structure and is arranged in a multi-station matrix. The first side of the shell cover groove 22 is provided with a number of abutment posts 23, and the second side is provided with a movable abutment block 242.

[0057] The multi-station matrix arrangement of the cover groove 22 design greatly improves production efficiency: multiple covers can be positioned and clamped in one clamping, and continuous operation can be achieved with the help of an automated loading and unloading system; the geometry of the groove structure matches the outer contour of the cover, providing a radial positioning reference and eliminating the rotational degree of freedom when the cover is placed.

[0058] The symmetrical arrangement of the fixed abutment post 23 and the movable abutment block 242 forms a two-way constraint on the shell cover: the fixed abutment post 23 serves as a reference positioning surface to determine the initial position of the shell cover; the movable abutment block 242 applies a controllable clamping force to the shell cover under the action of the drive unit, ensuring clamping stability while avoiding overpressure damage to the shell cover. This design simplifies the complexity of the clamping mechanism through single-sided drive, while utilizing a matrix arrangement of workstations to achieve a high-density layout and maximize the use of equipment space; the combined clamping method of the abutment post 23 and the abutment block 242 can adapt to irregular structures on the surface of the shell cover, such as lugs or grooves, improving clamping compatibility.

[0059] In this embodiment, the welding machine is a laser welding machine, and its optical lens is mounted above the welding station via a three-dimensional adjustment frame.

[0060] The application of laser welding technology significantly improves welding quality and efficiency: the high-energy-density laser beam enables instantaneous fusion of the casing and connecting piece, resulting in narrow and deep welds with a small heat-affected zone, avoiding deformation problems caused by traditional arc welding; the three-dimensional adjustment frame supports precise displacement of the optical lens in the X / Y / Z axes, allowing flexible adjustment of the welding path and focal point to adapt to different joint types such as lap or butt joints. The non-contact welding characteristics of the optical lens avoid mechanical interference between the welding torch and the workpiece, making it particularly suitable for welding complex spatial structures; through preset welding programs, it can automatically complete circumferential welds, straight welds, or multi-point welding tasks, ensuring the consistency of the welding trajectory. The high-rigidity structural design of the three-dimensional adjustment frame ensures the positioning accuracy of the optical lens during high-speed movement; the closed-loop feedback system corrects the lens position in real time, compensating for thermal deformation or mechanical errors, and improving the reliability of the welding process. This solution achieves high-quality sealing welding through precise control of process parameters such as power, frequency, and scanning speed, meeting the airtightness requirements of the battery cell casing.

[0061] In this embodiment, a visual positioning system is also included, comprising a CCD camera disposed above the welding station and an image processing module connected to the controller, for identifying the alignment status of the shell cover and the connecting piece.

[0062] The introduction of a vision positioning system enables precise alignment detection before welding: a CCD camera captures real-time images of the cover and connecting piece, and the image processing module extracts feature points such as edge contours and positioning holes, calculates the positional deviation between the two, and feeds it back to the controller; the controller then adjusts the motion parameters of the clamping mechanism or welding machine to ensure precise alignment of the joining area. The system's non-contact measurement characteristics avoid physical damage to the workpiece and support high-speed online inspection; multi-source illumination schemes, such as ring LEDs or coaxial lights, optimize image contrast and adapt to workpieces with different surface reflectivity. The image processing module uses edge detection, template matching, and other algorithms, combined with calibration parameters, to convert pixel coordinates into mechanical coordinates, achieving sub-pixel accuracy; historical record recording can analyze alignment trends, providing a basis for process optimization. The vision positioning system, along with the closed-loop control of the clamping mechanism and welding machine, forms a complete intelligent production line, significantly reducing intervention requirements and improving product qualification rates.

[0063] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pin-pressing type battery cell clamping mechanism, characterized in that, include: Battery cell clamping base (11); The battery cell carrier (12) is fixed to the battery cell clamping base (11) and has an alignment channel (121) coaxial with the hollow structure of the battery cell, for carrying the battery cell with connecting pieces connected to its end; The ejector pin (13) is axially movable through the alignment channel (121), and its execution end is provided with a crimping working surface (131) for crimping the connecting piece. The ejector power unit (14) drives the ejector (13) to move axially relative to the battery cell carrier (12).

2. The electrode-pressing type battery cell clamping mechanism according to claim 1, characterized in that, Also includes The first pressure detection unit (15) detects the contact pressure between the ejector pin (13) and the connecting piece; The displacement monitoring unit (16) is used to detect the axial displacement of the ejector pin (13); The controller has its signal input terminals connected to the first pressure detection unit (15) and the displacement monitoring unit (16) respectively, and its command output terminal connected to the ejector pin power unit (14).

3. The electrode-pressing type battery cell clamping mechanism according to claim 1, characterized in that, It also includes a cover pressure assembly (18) and a second pressure detection unit (17), the cover pressure assembly (18) comprising: The top plate of the housing cover (181) is configured to abut against the housing cover to be assembled; The base drive unit (182) is connected to the cell clamping base (11) and is used to drive the cell carrier (12) to carry the cell to the top plate (181) of the shell cover so that the cell is in close contact with the shell cover; The ejector pin (13) is configured to carry the connecting piece to the top plate (181) of the shell cover under the drive of the ejector pin power unit (14) so ​​that the connecting piece is in close contact with the shell cover; The second pressure detection unit (17) detects the clamping force between the battery cell carrier (12) and the battery cell; The controller signal input terminal is connected to the second pressure detection unit (17), and its command output terminal is connected to the base drive unit (182).

4. The pin-pressing battery cell clamping mechanism according to claim 3, characterized in that, It also includes a base (19), the cell clamping base (11) is movably mounted on the base (19) via a linear guide rail (191), and the base drive unit (182) is a linear drive mechanism installed between the base (19) and the cell clamping base (11).

5. The pin-pressing battery cell clamping mechanism according to claim 2, characterized in that, The ejector power unit (14) is a servo electric cylinder or a pneumatic-hydraulic booster cylinder, and its output end is rigidly connected to the ejector (13) through a connector (141).

6. The electrode-pressing type battery cell clamping mechanism according to claim 5, characterized in that, The connector (141) has an axially extending detection protrusion (1411) on its outer periphery. The displacement monitoring unit (16) includes a grating sensor (161) arranged parallel to the detection protrusion (1411). The displacement feedback signal of the ejector pin assembly is generated by identifying the displacement mark of the detection protrusion (1411).

7. A battery cell casing welding device, characterized in that, include: The pin-pressing cell clamping mechanism as described in any one of claims 1-6; The welding machine, with the working end of its welding torch aligned with the joint area between the housing cover and the connecting piece; The cover clamping assembly (2) includes: The cover clamping base (21) is orthogonally arranged with the cell clamping base (11) and forms an axial assembly channel for the cover-cell, and is provided with at least one cover groove (22) for accommodating the cover. Multiple abutment posts (23) are fixedly installed on the first side of the shell cover groove (22); The push rod assembly (24) includes a push rod (241) slidably disposed on the cover clamping base (21) and at least one abutment block (242) linked with the push rod (241). The clamping drive unit (25) is installed on the cover clamping base (21) and driven to connect with the push rod (241). It is used to drive the abutment block (242) to move to the second side of the cover groove (22) so that the abutment block (242) and the abutment post (23) cooperate to clamp the cover.

8. The cell casing welding device according to claim 7, characterized in that, The clamping drive unit (25) is a linear cylinder, and its piston rod (251) is rigidly connected to the push rod (241) through the connecting block (252).

9. The cell casing welding device according to claim 7, characterized in that, The abutment blocks (242) are arranged at equal intervals at the drive end of the push rod (241).

10. The cell casing welding device according to claim 7, characterized in that, The shell cover groove (22) is a groove structure and is arranged in a multi-station matrix. The first side of the shell cover groove (22) is provided with several abutting posts (23), and the second side is provided with a movable abutting block (242).

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