Lithium strip assembling and rolling device of battery cathode machine

Abstract

The invention relates to a battery negative electrode machine lithium strip assembling and rolling device which comprises a negative electrode machine lithium strip winding and assembling device and a negative electrode machine lithium strip rolling device, and the negative electrode machine lithium strip winding and assembling device is wound in situ in a battery steel shell to form an annular lithium strip ring; the negative electrode lithium strip rolling device compacts the annular lithium strip ring in a rotary rolling manner; the negative electrode machine lithium strip winding and assembling device comprises an assembling mandrel; the compression roller is annularly arranged on the periphery of the assembly mandrel, and a lithium strip winding channel is formed between the compression roller and the assembly mandrel; the circular motion assembly comprises a rotating main body connected with the pressing roller and a driving motor for driving the rotating main body to do reciprocating circular motion around the axis of the assembling mandrel; and the lifting feeding mechanism is used for driving the whole assembly mandrel to lift, so that the wound lithium strip ring is fed into the battery steel shell to be assembled. The invention provides a lithium strip assembling and rolling device of a battery cathode machine, which can reduce the risk of material damage and improve the stability and the assembling precision of a winding process.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing equipment technology, and in particular to a lithium strip assembly and rolling device for a battery negative electrode machine. Background Technology

[0002] In the manufacturing process of cylindrical lithium batteries, precisely winding ultra-thin lithium strips into a ring structure of a specific diameter and securely assembling it into a metal casing is a critical and challenging step. Currently, the automated winding equipment commonly used in the industry typically operates based on a design principle of rotating mandrel combined with fixed pressure rollers. This design may face several technical challenges in practical applications: when the mandrel rotates at high speed, driving the lithium strip, localized stress concentration points can easily form in the contact area between the lithium strip and the fixed pressure rollers, posing a potential risk of inducing tensile deformation or even micro-cracks in the material; at the beginning of the winding process, due to insufficient static friction, the lithium strip may slip or shift, affecting the concentricity of the final wound structure; after winding, the formed ring-shaped lithium strip needs to be removed from the mandrel and then transferred and assembled into the battery's steel casing. This transfer process itself may cause the wound structure to loosen, deform, or become misaligned, affecting subsequent process quality and battery performance. Therefore, developing an alternative that can reduce the risk of material damage and improve the stability and assembly accuracy of the winding process is of great practical value for improving the manufacturing yield and reliability of high-energy-density lithium batteries. Summary of the Invention

[0003] In view of this, the present invention provides a battery negative electrode lithium strip assembly and rolling device, which can reduce the risk of material damage, improve the stability of the winding process and the assembly accuracy.

[0004] The objective of this invention is achieved through the following technical solution: A battery negative electrode lithium strip assembly and rolling device includes a negative electrode lithium strip winding assembly device and a negative electrode lithium strip rolling device. The negative electrode lithium strip winding assembly device winds an annular lithium strip ring in situ inside the battery steel shell. The negative electrode lithium strip rolling device compacts the annular lithium strip ring by rotary rolling. The negative electrode lithium strip winding assembly device includes an assembly mandrel; a pressure roller arranged around the outer periphery of the assembly mandrel, forming a lithium strip winding channel between the pressure roller and the assembly mandrel; a circumferential motion assembly including a rotating body connected to the pressure roller and a drive motor that drives the rotating body to reciprocate in a circular motion around the axis of the assembly mandrel; and a lifting and feeding mechanism for driving the assembly mandrel to lift as a whole, so as to feed the wound lithium strip ring into the battery steel shell to be assembled. The negative electrode lithium strip rolling device includes a rotating clamp assembly for positioning the battery steel shell, a rotary drive mechanism for driving its rotation, and a rolling head that is passively rotated by the friction force of the inner wall of the steel shell.

[0005] An integrated battery anode production apparatus significantly optimizes the production process and improves product quality by combining lithium strip assembly and rolling functions into a single system. The lithium strip winding assembly unit employs an in-situ winding design, forming a ring-shaped lithium strip directly inside the battery's steel casing. This feature helps eliminate the risk of secondary handling during lithium strip transfer, reducing material damage or deformation caused by physical contact, thereby maintaining the structural integrity and uniformity of the lithium strip and preventing tearing or wrinkling. The drive motor in the circular motion assembly drives the rotating body in reciprocating circular motion. This motion mode ensures that the pressure rollers apply uniform force around the assembly mandrel, promoting smooth forming of the lithium strip in the winding channel, creating a highly consistent ring, reducing localized stress concentration caused by unidirectional movement, and thus improving winding accuracy and the final performance of the battery anode. The addition of a lifting and feeding mechanism allows for vertical movement of the assembly mandrel, automatically feeding the wound lithium strip ring into the steel shell without manual intervention or additional equipment transfer. This not only speeds up production but also reduces operational complexity, enhances automation, and ensures precise fit between the lithium strip ring and the steel shell cavity, preventing assembly misalignment or loosening. Simultaneously, the rotary rolling method of the negative electrode machine's lithium strip rolling device further reinforces the lithium strip ring, improving its density and electrical contact stability through compaction, which helps reduce internal battery impedance and improve energy transfer efficiency. The overall device design embodies the advantages of modular collaboration, reducing equipment footprint and energy consumption, adapting to battery shells of different sizes, and enhancing the flexibility and scalability of the production line. Furthermore, the original feature combination can reduce potential failure points; for example, by reducing lithium strip exposure time through in-situ operation, it mitigates the negative impact of environmental factors (such as humidity or oxidation) on the material, indirectly extending battery life. These advantages collectively support the reliability and economy of battery manufacturing, meeting the modern industrial pursuit of efficient and low-waste production.

[0006] Preferably, the rotating body is connected to the drive motor via a belt, the rotating body has a rotating arm, and the pressure roller is mounted on the rotating arm.

[0007] The rotating arm structure provides a stable and adjustable mounting point for the pressure roller, enabling it to move precisely along a preset trajectory. The rigid design of the rotating arm can withstand radial pressure during winding, preventing trajectory deviations caused by vibration and ensuring the concentricity of the lithium strip winding. Simultaneously, the extension length of the rotating arm is flexibly adjustable, facilitating adaptation to assembly mandrels of different diameters and enhancing equipment versatility. This modular design also simplifies the maintenance and replacement process of the pressure roller, reducing downtime.

[0008] Preferably, it also includes a pressure motor that drives the pressure roller to move closer to or away from the assembly mandrel.

[0009] The introduction of the clamping motor enables dynamic adjustment and automated control of winding pressure. By precisely adjusting the distance between the pressure roller and the assembly mandrel, the optimal clamping force can be applied to lithium strips of different thicknesses, hardnesses, or surface properties. For example, thinner lithium strips require less pressure to avoid indentation damage, while harder lithium strips require more pressure to ensure interlayer adhesion. This design solves the problems of over- or under-pressure caused by traditional fixed pressure, significantly reducing the rate of defects such as winding wrinkles and breaks. The pressure adjustment process does not require manual intervention and is responded to in real time by programmed control to process changes, improving production continuity. The clamping motor can also be used in conjunction with circular motion to achieve pressure gradient control, such as using lower pressure in the initial stage of winding to avoid lithium strip slippage, and gradually increasing pressure in subsequent lamination stages to increase core density, thereby optimizing the overall winding quality.

[0010] Preferably, it also includes a lithium strip cutting unit, which is disposed on the radial feeding side of the assembly mandrel, including a cutting blade and a cutting control module linked to the cutting blade.

[0011] The lithium strip cutting unit is located close to the feeding side of the assembly mandrel, which minimizes the transmission distance of the cut lithium strip segments and reduces the risk of twisting during transmission. The linkage design between the cutting control module and the cutting blade allows the cutting action to be precisely triggered based on the real-time detected lithium strip length data, avoiding material waste caused by manual measurement errors.

[0012] Preferably, the cutting control module includes a photoelectric sensor, a cutting blade cylinder, and a controller electrically connected to the cutting blade cylinder.

[0013] Photoelectric sensors detect markings or edge positions on the lithium strip non-contactly, avoiding material damage caused by mechanical contact. The controller calculates the lithium strip conveying length in real time based on the sensor signals and sends an electrical signal to the cutting blade cylinder when the set value is reached, realizing closed-loop control of pneumatic cutting and length detection, and improving the consistency of cutting length.

[0014] Preferably, the lifting and feeding mechanism further includes a linear guide rail and a servo motor that drives the assembly spindle to move up and down along the guide rail.

[0015] Linear guides provide high-rigidity vertical motion guidance for the lifting and feeding mechanism, suppressing horizontal sway of the assembly mandrel during lifting. Servo motors precisely control the speed curve of the lifting trajectory, ensuring smooth acceleration of the wound material (lithium strip) during transfer, preventing structural loosening, and reducing the problem of the wound material loosening due to sudden stops.

[0016] Preferably, the surface of the pressure roller is covered with a polyurethane elastic layer.

[0017] The polyurethane elastic layer forms a flexible contact interface on the surface of the pressure roller, and its moderate elastic deformation can absorb local pressure fluctuations during the lithium strip winding process. Compared with metal roller surfaces, this material can reduce indentation damage to the lithium strip surface, while increasing the friction between the material and the lithium strip, thus improving the traction stability of the thin strip.

[0018] Preferably, it also includes a pneumatic push rod, the output end of which is provided with a lithium strip positioning suction cup, the suction cup being positioned facing the surface of the assembly mandrel.

[0019] The pneumatically driven lithium strip positioning suction cup can quickly adsorb the end of the lithium strip after cutting and push it onto the surface of the assembly mandrel. The negative pressure adsorption method avoids the risk of mechanical grippers damaging the thin strip, while the pneumatic actuation provides a stable linear propulsion force, ensuring reliable initial contact between the lithium strip end and the mandrel surface.

[0020] Preferably, the surface of the assembly mandrel is provided with staggered hemispherical protrusions.

[0021] Hemispherical protrusions form a microscopic anchor point structure on the surface of the assembly mandrel, increasing the static friction between the protrusions and the lithium strip by increasing surface roughness. The staggered distribution design disperses stress, making it less likely for the lithium strip to slip off the mandrel surface during the initial winding stage. At the same time, the controllable protrusion height prevents puncture damage to the lithium strip.

[0022] Preferably, it also includes a lithium strip unwinding system, which includes an unwinding roller, a guide roller group, and a tension detection roller.

[0023] The unwinding rollers provide a stable release source for the lithium strip coil, while the guide rollers constrain the lateral movement of the lithium strip in the transport path. Tension detection rollers monitor the strip tension in real time, generating feedback signals for the unwinding speed to prevent stretching deformation of the lithium strip due to excessive tension or wrinkling of the stacked material due to insufficient tension.

[0024] Preferably, the negative electrode lithium strip rolling device includes a rotary clamp assembly, a rotary drive mechanism for driving the rotary clamp assembly to rotate around its own axis, and a rolling head disposed above the rotary clamp assembly. The top of the rotary clamp assembly is provided with an annular groove for positioning the cylindrical steel shell. The lower end of the rolling head can extend into the inner cavity of the cylindrical steel shell and contact the lithium strip. The rolling head has no mechanical transmission connection with the rotary drive mechanism and can be passively rotated by the friction force of the inner wall of the cylindrical steel shell.

[0025] A unique dynamic pressing structure is constructed through the coordinated design of a rotating clamp assembly and a passive pressing head. When the rotating clamp assembly drives the cylindrical steel shell to rotate actively, the pressing head passively rotates due to friction with the inner wall of the steel shell, creating relative motion. This motion mode allows the pressing head to continuously apply radial and tangential rolling pressure to the lithium strip, achieving uniform pressing of the lithium strip along the circumference of the inner wall of the steel shell. Compared to traditional static pressing, this structure completely solves the problem of loose adhesion between the lithium strip and the inner wall of the steel shell, avoiding localized gaps or stress concentrations, and significantly improving the battery's conductivity and structural reliability.

[0026] Meanwhile, the core innovation of this solution lies in the mechanical decoupling design between the rolling head and the rotary drive mechanism. This design allows the rolling head to be driven solely through physical contact, eliminating the need for additional transmission devices and significantly simplifying the mechanical structure. This simplification reduces equipment manufacturing costs and maintenance difficulty, and effectively avoids rolling head jamming caused by interference from the transmission mechanism. Under high-speed rotation conditions, the mechanical decoupling characteristic can also absorb the speed difference between the steel shell and the rolling head, preventing scratches on the lithium strip surface caused by forced transmission and ensuring the integrity of the electrode interface.

[0027] Preferably, the annular groove is provided with at least three radially adjustable clamping blocks in the circumferential direction.

[0028] By incorporating circumferentially distributed radially adjustable clamping blocks, the device can accommodate cylindrical steel shells of varying diameters. The radial adjustment capability of the clamping blocks allows the device to be compatible with multiple battery models without requiring fixture changes, significantly improving its versatility. The arrangement of at least three clamping blocks forms a stable three-point clamping structure, ensuring that the steel shell does not experience radial displacement or vibration during high-speed rotation. This clamping method is particularly suitable for thin-walled steel shells, as it evenly distributes clamping force, preventing deformation due to excessive localized stress, while maintaining the roundness accuracy of the steel shell and providing a stable reference positioning for subsequent rolling processes.

[0029] Preferably, the rolling head is connected to the output end of the pressure actuator via a rotating support.

[0030] The introduction of a rotating support is crucial for achieving passive rotation of the compaction head. This structure allows the compaction head to maintain free rotation while bearing axial pressure, ensuring it always follows the movement of the inner wall of the steel shell. Compared to a rigid connection, the rotating support effectively isolates the pressure actuator from the interference of the rotational torque, extending the service life of the power components. Furthermore, this design allows the compaction head to adaptively adjust its angle at a microscale. When there is slight non-roundness in the inner wall of the steel shell, the compaction head can automatically fine-tune its posture to maintain full contact, improving compaction uniformity.

[0031] Preferably, the pressure actuator is a linear power source, and its direction of motion is parallel to the axis of the compaction head.

[0032] A linear power source provides precise and controllable axial pressure, and its parallel axis design ensures that the pressure acts perpendicularly on the lithium strip surface. This arrangement avoids lateral force-induced roll head swaying and maintains the coaxiality of the roll head with the inner wall of the steel shell. The linear drive characteristic enables high repeatability of the pressure loading process, allowing for the setting of optimal rolling pressure for lithium strips of different thicknesses. Compared to rotary pressure mechanisms, this design significantly simplifies the control system, achieving precise matching of rolling process parameters through pressure-displacement dual closed-loop control.

[0033] Preferably, the rotary drive mechanism includes a drive motor, the output of which is coaxially connected to the rotary clamp assembly.

[0034] The coaxial connection between the drive motor and the rotating clamp assembly maximizes power transmission efficiency. This arrangement eliminates angle conversion links in the transmission chain, reducing rotational vibration and energy loss. The coaxial design maintains high stability of the rotation axis, providing a technical foundation for high-speed rotational operations. The direct drive mode also enables precise closed-loop control of the rotational speed, keeping the circumferential movement speed of the compaction head on the inner wall of the steel shell constant. This ensures consistent compaction intensity across the entire lithium belt, preventing uneven compaction caused by speed fluctuations.

[0035] Preferably, it also includes a frame, and a first height adjustment mechanism is provided between the rotating clamp assembly and the frame.

[0036] The height adjustment mechanism enables the rotary clamp assembly to be adjusted vertically. This design compensates for differences in steel shell heights, ensuring the rolling head is always inserted into the shell cavity with optimal stroke. The height adjustability also facilitates access to the work area during equipment maintenance, simplifying cleaning and component replacement operations. During production line changeovers, the height adjustment mechanism can quickly adapt to new battery models, reducing equipment repositioning time and improving production flexibility. The mechanism also provides a buffer function, allowing for a slight retraction to protect core components in the event of accidental overload.

[0037] Preferably, the working end face of the rolling head is a curved rolling structure.

[0038] The curved rolling structure optimizes stress distribution during the rolling process. The curved profile creates a gradual pressure transition in the initial contact area, avoiding shear damage to the lithium strip from right-angled edges. During dynamic rolling, the curved structure guides the lithium strip material to extend and flow tangentially, promoting microscopic adhesion between the lithium strip and the inner wall of the steel shell. Compared to planar structures, the curved design reduces rolling resistance by approximately 30%, lowering drive energy consumption. Its streamlined profile also prevents lithium strip material accumulation at the rolling edges, maintaining the cleanliness of the rolling interface, which is particularly important for the fabrication of high-purity lithium electrodes.

[0039] Preferably, the sidewall of the rolling head is provided with an axially extending anti-rotation protrusion.

[0040] The axial anti-rotation protrusion is a key feature ensuring compaction accuracy. This structure restricts the free rotation of the compactor head when not in operation, ensuring a controllable starting position for each compaction cycle. During insertion into the steel shell, the clearance fit between the anti-rotation protrusion and the inner wall of the shell provides guidance, preventing the compactor head from skewing and colliding with the inner wall. During operation, the protrusion generates a slight turbulence effect, which can promptly remove debris generated at the compaction interface. This design also enhances the torsional stiffness of the compactor head, maintaining structural stability under high-pressure conditions and preventing axial misalignment caused by torque impact.

[0041] Preferably, the bottom of the annular groove is provided with a clamping force detection unit.

[0042] The clamping force detection unit enables real-time monitoring of the clamping process. By detecting the actual pressure applied by the clamping blocks, the clamping force can be dynamically adjusted to the optimal range, ensuring reliable fixation of the steel shell while preventing deformation due to over-clamping. After the detection data is fed back to the control system, it can automatically compensate for clamping force attenuation caused by fixture wear, maintaining process consistency. This unit can also identify abnormal placement of the steel shell, such as vacant or tilted positions, triggering equipment protection procedures to avoid collisions, thus improving production safety and equipment uptime.

[0043] Preferably, the rolling head integrates a temperature control module.

[0044] The temperature control module expands process adaptability. By precisely controlling the operating temperature of the rolling head, the plasticity and flowability of the lithium material can be adjusted. Low-temperature conditions increase the stiffness of the lithium strip, which is beneficial for high-pressure densification, while medium-temperature conditions promote the diffusion bonding between the lithium strip and the steel shell. The temperature control capability allows the same equipment to process lithium strips with different alloy ratios without changing the rolling tools. The module adopts an internally integrated design, minimizing the heat conduction path and achieving millisecond-level temperature response. The closed thermal management also avoids interference from external heaters on the rotating mechanism, maintaining the dynamic balance accuracy of the equipment.

[0045] The advantages of this invention compared to the prior art are: The battery negative electrode lithium strip assembly and rolling device provided by this invention, through its specific structural design, exhibits many beneficial effects compared to the prior art, mainly reflected in the following aspects: 1. Enhanced Material Integrity and Assembly Precision: The core innovation of this device lies in its "in-situ winding" design. The lithium strip winding assembly device for the negative electrode assembly directly winds and forms the annular lithium strip ring inside the steel shell of the battery to be assembled. This method fundamentally avoids the critical step of transferring the lithium strip ring from the external winding mandrel to the steel shell in traditional processes. Therefore, it significantly reduces the risk of physical damage (such as tearing, wrinkling) or structural deformation (such as loosening, out-of-roundness) that may be caused by secondary handling, clamping, or positioning operations during the transfer of the lithium strip, better maintaining the structural integrity of the lithium strip and the accuracy of the initial assembly position.

[0046] 2. Optimized Stability and Uniformity of the Winding Process: This device employs a unique motion mode. Its circumferential motion component drives the pressure roller (rather than the mandrel) to reciprocate in a circular motion around the fixed assembly mandrel axis. This motion allows the pressure roller to apply continuous and uniform pressure along the outer circumference of the mandrel. The lithium strip is "passively" drawn and shaped within the winding channel formed by the pressure roller and the mandrel, which helps reduce stress concentration within the lithium strip, particularly avoiding the localized high-stress points that may occur when the fixed pressure roller engages with the high-speed rotating mandrel. The reciprocating motion also contributes to a uniform layering effect, reducing the possibility of slippage or wrinkling of the lithium strip during winding, thereby improving the stability of the winding process and the uniformity and concentricity of the resulting annular lithium strip coil.

[0047] 3. Achieving efficient and non-destructive assembly integration: The design of the lifting and feeding mechanism is key to the device's "in-situ assembly." This mechanism drives the entire assembly mandrel (along with the lithium strip coil just wound on it) as a single unit to move up and down. After winding, the mandrel and lithium strip coil can rise directly and smoothly into the pre-positioned inner cavity of the battery steel shell. This "integrated lifting and feeding" method seamlessly connects the winding and shell-mounting processes, eliminating traditional transfer steps and their associated risks, significantly simplifying the operation process, improving assembly efficiency and reliability, and ensuring the precise positioning of the lithium strip coil within the steel shell cavity.

[0048] 4. Enhanced Process Adaptability and Synergy: This device integrates lithium strip winding and assembly with subsequent rolling and compaction functions. The lithium strip rolling device in the negative electrode machine compacts the lithium strip rings already installed in the steel shell through rotational rolling, further improving its structural density and contact effect with the inner wall of the steel shell. This integrated design not only reduces the space occupied by the equipment, but more importantly, because the lithium strip rings are wound in situ and directly compacted, it avoids the quality loss that may be caused by intermediate steps. This allows the winding and compaction processes to work more closely and efficiently, helping to improve the overall quality and performance consistency of the final battery negative electrode.

[0049] In summary, this lithium strip assembly and rolling device for the battery negative electrode machine, through its specific structural combination (in-situ winding, circumferential motion of the pressure roller, overall lifting of the mandrel, and integrated rolling), offers potential technical advantages in reducing the risk of lithium strip processing damage, improving the stability and precision of the winding and assembly process, and optimizing production process efficiency. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a structural diagram of a negative electrode lithium strip winding and assembly device according to an embodiment of the present invention.

[0052] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0053] Figure 3 This is a structural diagram of a negative electrode lithium strip winding and assembly device according to an embodiment of the present invention from another perspective.

[0054] Figure 4 for Figure 3 A magnified view of region B in the middle.

[0055] Figure 5 This is a structural diagram of a negative electrode lithium strip rolling device according to an embodiment of the present invention.

[0056] Figure 6 for Figure 5 A magnified view of region C in the middle.

[0057] Labeling Explanation: 01 Battery Steel Shell, 02 Lithium Strip, 1000 Negative Electrode Lithium Strip Winding Assembly Device, 1100 Assembly Mandrel, 1200 Pressure Roller, 1300 Circular Motion Assembly, 1310 Rotating Body, 1311 Rotating Arm, 1320 Drive Motor, 1340 Pressing Motor, 1400 Lifting and Feeding Mechanism, 1410 Linear Guide Rail, 1420 Servo Motor, 1500 Lithium Strip Cutting Unit, 1510 Cutting Blade, 1520 Cutting Blade Cylinder, 1600 Lithium Strip Unwinding System, 1610 Unwinding Roller, 1620 Guide Roller Group; 2000 Negative Electrode Lithium Strip Rolling Device, 2100 Rotary Clamp Assembly, 2110 Annular Groove, 2200 Rotary Drive Mechanism, 2210 Drive Motor, 2400 Rolling Head, 2410 Rotary Support Component. Detailed Implementation

[0058] 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.

[0059] 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.

[0060] 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.

[0061] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0062] The technical solutions in this application will now be described with reference to the accompanying drawings. Example 1

[0063] A battery negative electrode lithium strip assembly and rolling device includes a negative electrode lithium strip winding assembly device 1000 and a negative electrode lithium strip rolling device 2000. The negative electrode lithium strip winding assembly device 1000 winds an annular lithium strip ring 02 in situ inside the battery steel shell 01. The negative electrode lithium strip rolling device 2000 compacts the annular lithium strip ring 02 by rotary rolling. The negative electrode lithium strip winding assembly device 1000 includes an assembly mandrel 1100 and a pressure roller 1200 circumferentially arranged around the assembly mandrel 1100. A lithium strip 02 winding channel is formed between the pressure roller 1200 and the assembly mandrel 1100 on the outer periphery of 100; a circular motion assembly 1300 includes a rotating body 1310 connected to the pressure roller 1200 and a drive motor 1320 that drives the rotating body 1310 to reciprocate in a circular motion around the axis of the assembly mandrel 1100; a lifting and feeding mechanism 1400 is used to drive the assembly mandrel 1100 to lift as a whole so as to send the wound lithium strip ring 02 into the battery steel shell 01 to be assembled.

[0064] An integrated battery anode production apparatus significantly optimizes the production process and improves product quality by integrating lithium strip 02 assembly and rolling functions into a single system. The lithium strip winding assembly unit 1000 employs an in-situ winding design, directly forming annular lithium strip rings 02 inside the battery steel casing 01. This feature helps eliminate the risk of secondary handling of the lithium strip 02 during transfer, reducing material damage or deformation caused by physical contact, thereby maintaining the structural integrity and uniformity of the lithium strip 02 and preventing tearing or wrinkling. The drive motor 1320 in the circular motion assembly 1300 drives the rotating body 1310 in reciprocating circular motion. This motion mode ensures that the pressure roller 1200 applies uniform force around the assembly mandrel 1100, promoting smooth formation of the lithium strip 02 in the winding channel, forming highly consistent annular rings, reducing localized stress concentration caused by unidirectional movement, and thus improving winding accuracy and the final performance of the battery anode. The addition of the lifting and feeding mechanism 1400 allows the assembly mandrel 1100 to move vertically as a whole, automatically feeding the wound lithium strip ring 02 into the steel shell 01 without manual intervention or additional equipment transfer. This not only speeds up the production cycle but also reduces operational complexity, enhances automation, and ensures precise fit between the lithium strip ring 02 and the inner cavity of the steel shell 01, preventing assembly misalignment or loosening. Simultaneously, the rotary rolling method of the negative electrode machine's lithium strip rolling device 2000 further reinforces the lithium strip ring 02, improving its density and electrical contact stability through compaction, which helps reduce internal battery impedance and improve energy transfer efficiency. The overall device design embodies the advantages of modular collaboration, reducing equipment footprint and energy consumption, adapting to battery steel shells 01 of different sizes, and enhancing the flexibility and scalability of the production line. Furthermore, the original feature combination can reduce potential failure points, such as reducing the exposure time of the lithium strip 02 through in-situ operation, mitigating the negative impact of environmental factors (such as humidity or oxidation) on the material, and indirectly extending battery life. These advantages collectively underpin the reliability and economy of battery manufacturing, aligning with modern industry's pursuit of efficient and low-waste production.

[0065] In this embodiment, the rotating body 1310 is connected to the drive motor 1320 via a belt. The rotating body 1310 has a rotating arm 1311, and the pressure roller 1200 is mounted on the rotating arm 1311.

[0066] The rotating arm 1311 provides a stable and adjustable mounting point for the pressure roller 1200, enabling it to move precisely along a preset trajectory. The rigid design of the rotating arm 1311 withstands radial pressure during winding, preventing trajectory deviations caused by vibration and ensuring the concentricity of the lithium strip 02 winding. Simultaneously, the extension length of the rotating arm 1311 is flexibly adjustable to accommodate assembly mandrels 1100 of different diameters, enhancing equipment versatility. This modular design also simplifies the maintenance and replacement process of the pressure roller 1200, reducing downtime.

[0067] In this embodiment, a pressure motor 1340 is also included, which drives the pressure roller 1200 to approach or move away from the assembly mandrel 1100.

[0068] The introduction of the pressure motor 1340 enables dynamic adjustment and automated control of winding pressure. By precisely adjusting the distance between the pressure roller 1200 and the assembly mandrel 1100, the optimal pressing force can be applied to lithium strips 02 with different thicknesses, hardness, or surface characteristics. For example, thinner lithium strips 02 require less pressure to avoid indentation damage, while harder lithium strips 02 require greater pressure to ensure interlayer adhesion. This design solves the problems of overpressure or underpressure caused by traditional fixed pressure, significantly reducing the rate of defects such as winding wrinkles and breakage. The pressure adjustment process does not require manual intervention by stopping the machine; it responds to process changes in real time through programmed control, improving production continuity. The pressure motor 1340 can also work with the circumferential motion component 1300 to achieve pressure gradient control, such as using lower pressure in the initial stage of winding to avoid slippage of the lithium strip 02, and gradually increasing the pressure in the subsequent layering stage to increase the core density, thereby optimizing the overall winding quality.

[0069] In this embodiment, a lithium strip cutting unit 1500 is also included, which is disposed on the radial feeding side of the assembly mandrel 1100 and includes a cutting blade 1510 and a cutting control module that is linked to the cutting blade 1510.

[0070] The lithium strip cutting unit 1500 is located close to the feeding side of the assembly mandrel 1100, which can minimize the transmission distance of the cut lithium strip 02 segment and reduce the risk of twisting during transmission. The linkage design between the cutting control module and the cutting blade 1510 enables the cutting action to be precisely triggered based on the real-time detected length data of the lithium strip 02, avoiding material waste caused by manual measurement errors.

[0071] In this embodiment, the cutting control module includes a photoelectric sensor, a cutting blade cylinder 1520, and a controller electrically connected to the cutting blade cylinder 1520.

[0072] The photoelectric sensor detects the markings or edge positions on the lithium strip 02 in a non-contact manner, avoiding material damage caused by mechanical contact. The controller calculates the conveying length of the lithium strip 02 in real time based on the sensor signal, and sends an electrical signal to the cutting blade cylinder 1520 when the set value is reached, realizing closed-loop control of pneumatic cutting and length detection, and improving the consistency of cutting length.

[0073] In this embodiment, the lifting and feeding mechanism 1400 also includes a linear guide rail 1410 and a servo motor 1420 that drives the assembly spindle 1100 to move up and down along the guide rail.

[0074] The linear guide 1410 provides high-rigidity vertical motion guidance for the lifting and feeding mechanism 1400, suppressing the horizontal sway of the assembly mandrel 1100 during the lifting process. The servo motor 1420 ensures that the winding body (lithium strip 02) accelerates smoothly during transfer by precisely controlling the speed curve of the lifting trajectory, avoiding structural loosening and reducing the problem of winding body loosening caused by sudden stops.

[0075] In this embodiment, a lithium strip unwinding system 1600 is also included, which includes an unwinding roller 1610, a guide roller group 1620, and a tension detection roller.

[0076] The unwinding roller 1610 provides a stable release source for the lithium strip 02 coil, while the guide roller group 1620 constrains the lateral movement of the lithium strip 02 in the transport path. The tension detection roller monitors the strip tension in real time, generating a feedback signal for the unwinding speed to avoid stretching deformation of the lithium strip 02 due to excessive tension or material wrinkling caused by insufficient tension.

[0077] In this embodiment, the negative electrode lithium strip rolling device 2000 includes a rotary clamp assembly 2100, a rotary drive mechanism 2200 that drives the rotary clamp assembly 2100 to rotate around its own axis, and a rolling head 2400 disposed above the rotary clamp assembly 2100. The top of the rotary clamp assembly 2100 is provided with an annular groove 2110 for positioning the cylindrical steel shell 01. The lower end of the rolling head 2400 can extend into the inner cavity of the cylindrical steel shell 01 and contact the lithium strip 02. The rolling head 2400 has no mechanical transmission connection with the rotary drive mechanism 2200 and can be passively rotated by the friction force of the inner wall of the cylindrical steel shell 01. The sidewall of the rolling head 2400 is covered with a high friction coefficient material layer (such as a polyurethane-silicon carbide composite coating) to ensure that the friction force with the inner wall of the steel shell is sufficient to drive its synchronous rotation.

[0078] A unique dynamic pressing structure is constructed through the coordinated design of the rotating clamp assembly 2100 and the passive pressing head 2400. When the rotating clamp assembly 2100 drives the cylindrical steel shell 01 to rotate actively, the pressing head 2400 is passively rotated due to the friction with the inner wall of the steel shell 01, forming relative motion. This motion mode allows the pressing head 2400 to continuously apply radial and tangential rolling pressure to the lithium strip 02, achieving uniform pressing of the lithium strip 02 along the circumference of the inner wall of the steel shell 01. Compared with traditional static pressing, this structure completely solves the problem of loose adhesion between the lithium strip 02 and the inner wall of the steel shell 01, avoids localized poor connections or stress concentration, and significantly improves the battery's conductivity and structural reliability.

[0079] Meanwhile, the core innovation of this solution lies in the mechanical decoupling design between the rolling head 2400 and the rotary drive mechanism 2200. This design allows the rolling head 2400 to be driven solely through physical contact, eliminating the need for additional transmission devices and significantly simplifying the mechanical structure. This simplification reduces equipment manufacturing costs and maintenance difficulty, and effectively avoids the rolling head 2400 jamming problem caused by interference from the transmission mechanism. Under high-speed rotation conditions, the mechanical decoupling characteristic can also absorb the speed difference between the steel shell 01 and the rolling head 2400, preventing scratches on the surface of the lithium strip 02 due to forced transmission and ensuring the integrity of the electrode interface.

[0080] In this embodiment, the annular groove 2110 is provided with at least three radially adjustable clamping blocks in the circumferential direction.

[0081] By incorporating circumferentially distributed radially adjustable clamping blocks, the device can accommodate cylindrical steel shells 01 of varying diameters. The radial adjustment capability of the clamping blocks allows the device to be compatible with multiple battery models without requiring fixture replacement, significantly improving its versatility. The arrangement of at least three clamping blocks forms a stable three-point clamping structure, ensuring that the steel shell 01 does not experience radial displacement or vibration during high-speed rotation. This clamping method is particularly suitable for thin-walled steel shells 01, as it evenly distributes clamping force, preventing deformation due to excessive localized stress, while maintaining the roundness accuracy of the steel shell 01 and providing a stable reference positioning for subsequent rolling processes.

[0082] In this embodiment, the rolling head 2400 is connected to the output end of the pressure actuator via a rotating support 2410.

[0083] The introduction of the rotating support 2410 is a key guarantee for the passive rotation of the compaction head 2400. This structure allows the compaction head 2400 to maintain free rotation while bearing axial pressure, ensuring that it always follows the movement of the inner wall of the steel shell 01. Compared to a rigid connection, the rotating support 2410 effectively isolates the mutual interference between the pressure actuator and the rotational torque, extending the service life of the power components. In addition, this design allows the compaction head 2400 to adaptively adjust its angle at a microscale. When there is slight non-roundness in the inner wall of the steel shell 01, the compaction head 2400 can automatically fine-tune its posture to maintain full contact, improving the uniformity of compaction.

[0084] In this embodiment, the pressure actuator is a linear power source, and its direction of motion is parallel to the axis of the rolling head 2400.

[0085] A linear power source provides precise and controllable axial pressure, and its parallel axis design ensures that the pressure acts perpendicularly on the surface of the lithium strip 02. This arrangement avoids swaying of the compaction head 2400 caused by lateral forces, maintaining the coaxiality of the compaction head 2400 and the inner wall of the steel shell 01. The linear drive characteristic enables high repeatability of the pressure loading process, allowing for the setting of optimal compaction pressure for lithium strips 02 of different thicknesses. Compared to a rotary pressure mechanism, this design significantly simplifies the control system, achieving precise matching of compaction process parameters through pressure-displacement dual closed-loop control.

[0086] In this embodiment, the rotary drive mechanism 2200 includes a drive motor 2210, the output of which is coaxially connected to the rotary clamp assembly 2100.

[0087] The coaxial connection between the drive motor 2210 and the rotary clamp assembly 2100 maximizes power transmission efficiency. This arrangement eliminates angle conversion links in the transmission chain, reducing rotational vibration and energy loss. The coaxial design maintains high stability of the rotation axis, providing a technical basis for high-speed rotational conditions. The direct drive mode also enables precise closed-loop control of the rotational speed, keeping the circumferential movement speed of the compaction head 2400 on the inner wall of the steel shell 01 constant, ensuring that the entire lithium belt 02 bears consistent compaction intensity, and avoiding uneven compaction caused by speed fluctuations.

[0088] In this embodiment, a frame is also included, and a first height adjustment mechanism is provided between the rotating clamp assembly 2100 and the frame.

[0089] The height adjustment mechanism enables the rotary clamp assembly 2100 to be adjusted vertically. This design compensates for differences in the height of the steel shell 01, ensuring that the rolling head 2400 is always inserted into the inner cavity of the steel shell 01 with optimal stroke. The height adjustability also facilitates access to the work area during equipment maintenance, simplifying cleaning and component replacement operations. During production line changeovers, the height adjustment mechanism can quickly adapt to new battery models, reducing equipment repositioning time and improving production flexibility. The mechanism also provides a buffer function, allowing for slight retraction to protect core components in the event of accidental overload.

[0090] In this embodiment, the working end face of the rolling head 2400 is a curved rolling structure.

[0091] The curved rolling structure optimizes stress distribution during the rolling process. The curved profile creates a gradual pressure transition in the initial contact area, avoiding shear damage to the lithium strip O2 from right-angled edges. During dynamic rolling, the curved structure guides the lithium strip O2 material to extend and flow tangentially, promoting microscopic adhesion between the lithium strip O2 and the inner wall of the steel shell O1. Compared to the planar structure, the curved design reduces rolling resistance by approximately 30%, lowering drive energy consumption. Its streamlined profile also prevents the accumulation of lithium strip O2 material at the rolling edge, maintaining the cleanliness of the rolling interface, which is particularly important for the fabrication of high-purity lithium electrodes.

[0092] In this embodiment, the sidewall of the rolling head 2400 is provided with an axially extending anti-rotation protrusion.

[0093] The axial anti-rotation protrusion is a key feature ensuring compaction accuracy. This structure restricts the free rotation of the compaction head 2400 when not in operation, ensuring a controllable starting position for each compaction cycle. During insertion into the steel shell 01, the clearance fit between the anti-rotation protrusion and the inner wall of the steel shell 01 provides a guiding function, preventing the compaction head 2400 from deviating and colliding with the inner wall. During operation, the protrusion generates a slight turbulence effect, which can promptly remove debris generated at the compaction interface. This design also enhances the torsional stiffness of the compaction head 2400, maintaining structural stability under high-pressure conditions and preventing axial misalignment caused by torque impact.

[0094] In this embodiment, a clamping force detection unit is provided at the bottom of the annular groove 2110.

[0095] The clamping force detection unit enables real-time monitoring of the clamping process. By detecting the actual pressure applied by the clamping blocks, the clamping force can be dynamically adjusted to the optimal range, ensuring reliable fixation of the steel shell 01 while preventing deformation due to over-clamping. After the detection data is fed back to the control system, it can automatically compensate for the clamping force attenuation caused by fixture wear, maintaining process consistency. This unit can also identify abnormal placement of the steel shell 01, such as vacant or tilted positions, triggering equipment protection programs to avoid collision accidents, improving production safety and equipment uptime.

[0096] In this embodiment, the rolling head 2400 integrates a temperature control module.

[0097] The temperature control module expands process adaptability. By precisely controlling the 2400°C operating temperature of the rolling head, the plasticity and flowability of the lithium material can be adjusted. Low-temperature conditions increase the stiffness of the lithium strip O2, which is beneficial for high-pressure densification, while medium-temperature conditions promote the diffusion bonding between the lithium strip O2 and the steel shell O1. The temperature control capability allows the same equipment to process lithium strip O2 with different alloy ratios without changing the rolling tools. The module adopts an internally integrated design with the shortest heat conduction path, achieving millisecond-level temperature response. The closed thermal management also avoids interference from external heaters on the rotating mechanism, maintaining the dynamic balance accuracy of the equipment. Example 2

[0098] Based on Example 1, the surface of the pressure roller 1200 in this example is covered with a polyurethane elastic layer.

[0099] The polyurethane elastic layer forms a flexible contact interface on the surface of the pressure roller 1200. Its moderate elastic deformation can absorb local pressure fluctuations during the winding process of the lithium strip 02. Compared with the metal roller surface, this material can reduce indentation damage to the surface of the lithium strip 02, while increasing the friction between the material and the lithium strip 02, thus improving the traction stability of the thin strip. Example 3

[0100] Based on Embodiment 1, this embodiment also includes a pneumatic push rod, the output end of which is provided with a lithium strip positioning suction cup, the suction cup being positioned facing the surface of the assembly mandrel 1100.

[0101] A pneumatically driven lithium strip positioning suction cup can quickly adsorb the end of the lithium strip 02 after cutting and push it onto the surface of the assembly mandrel 1100. The negative pressure adsorption method avoids the risk of mechanical grippers damaging the thin strip, while the pneumatic actuation provides a stable linear propulsion force, ensuring the initial adhesion reliability between the end of the lithium strip 02 and the mandrel surface. Example 4

[0102] Based on Example 1, the surface of the assembly mandrel 1100 in this example is provided with staggered hemispherical protrusions.

[0103] The hemispherical protrusions form a microscopic anchor point structure on the surface of the assembly mandrel 1100, increasing the static friction between the mandrel and the lithium strip 02 by increasing the surface roughness. The staggered distribution design disperses stress, making it less likely for the lithium strip 02 to slip off the mandrel surface during the initial stage of winding. At the same time, the controllable height of the protrusions will not cause puncture damage to the lithium strip 02.

[0104] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery negative electrode machine lithium ribbon assembling and rolling device, characterized in that, The application relates to a negative electrode lithium strip winding and assembling device (1000) and a negative electrode lithium strip rolling device (2000), wherein the negative electrode lithium strip winding and assembling device (1000) winds a lithium strip into a ring-shaped lithium strip coil in a battery steel shell; the negative electrode lithium strip rolling device (2000) compacts the ring-shaped lithium strip coil through a rotary rolling mode; the negative electrode lithium strip winding and assembling device comprises an assembling mandrel (1100); a compression roller (1200) arranged on the outer periphery of the assembling mandrel (1100), and a lithium strip winding channel is formed between the compression roller (1200) and the assembling mandrel (1100); a circumferential motion assembly (1300) comprising a rotating body (1310) connected with the compression roller (1200) and a driving motor (1320) for driving the rotating body (1310) to make reciprocating circumferential motion around the axis of the assembling mandrel (1100); a lifting feeding mechanism (1400) for driving the assembling mandrel (1100) to lift as a whole so as to send the lithium strip coil after winding into a battery steel shell to be assembled; the negative electrode lithium strip rolling device (2000) comprises a rotary clamp assembly (2100) capable of positioning the battery steel shell, a rotary driving mechanism (2200) for driving the rotary clamp assembly (2100) to rotate, and a rolling head (2400) passively rotating under the friction force of the inner wall of the steel shell.

2. The apparatus of claim 1, wherein, The rotating body (1310) is in transmission connection with the driving motor (1320) through a belt (1312), and the rotating body (1310) has a rotating arm (1311), and the compression roller (1200) is mounted on the rotating arm (1311).

3. The apparatus of claim 1, wherein, A compression motor (1340) is further arranged, and the compression motor (1340) drives the compression roller to move close to or away from the assembling mandrel (1100).

4. The apparatus of claim 1, wherein, A lithium strip cutting unit (1500) is further arranged on the radial feeding side of the assembling mandrel (1100), and the lithium strip cutting unit (1500) comprises a cutting knife (1510), a cutting knife cylinder (1520) and a cutting control module connected with the cutting knife cylinder.

5. The apparatus of claim 1, wherein, A lithium strip unwinding system (1600) is further arranged, and the lithium strip unwinding system (1600) comprises an unwinding wheel (1610), a guide roller group (1620) and a tension detection roller.

6. The apparatus of claim 1, wherein, The negative electrode lithium strip rolling device (2000) comprises: a rotary clamp assembly (2100) provided with an annular groove (2110) at the top for positioning a cylindrical steel shell (01); a rotary driving mechanism (2200) for driving the rotary clamp assembly (2100) to rotate around the axis of the rotary clamp assembly (2100); a rolling head (2400) arranged above the rotary clamp assembly (2100), and the lower end of the rolling head (2400) can extend into the inner cavity of the cylindrical steel shell (201) and contact the lithium strip (02); the rolling head (2400) is not in mechanical transmission connection with the rotary driving mechanism (2200), and can passively rotate under the friction force of the inner wall of the cylindrical steel shell (201).

7. The apparatus of claim 6, wherein, the rolling head (2400) is connected with the output end of a pressure executing mechanism through a rotating support (2410).

8. The apparatus of claim 6, wherein, the rotary driving mechanism (2200) comprises a driving motor (2210), and the output end of the driving motor (2210) is coaxially and in transmission connection with the rotary clamp assembly (2100).

9. The apparatus of claim 6, wherein, at least three radially adjustable clamping blocks are circumferentially arranged on the annular groove (2110).

10. The apparatus of claim 6, wherein, A rack is further included, and a first height adjusting mechanism is arranged between the rotating clamp assembly (2100) and the rack.

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