Flexible customized pole piece die-cutting equipment, empowering lithium battery production process to improve quality-customized processing solution of lithium battery pole piece die-cutting machine

In the manufacturing process of lithium batteries, die-cutting of pole pieces is the core process that determines the safety, yield and consistency of batteries. The burr, powder drop and size deviation of pole ear forming and slicing will directly bury the quality hidden dangers such as short circuit and cyclic attenuation of batteries. With the rapid iteration of power lithium battery, energy storage battery, consumer battery and new sodium ion battery technology, the iteration speed of battery specifications is accelerated, and it is increasingly difficult for standardized die-cutting equipment to adapt to differentiated process requirements. Non-standard customized pole piece die cutting machine can be developed according to the customer's production line layout, pole piece formula and battery structure, and realize seamless connection between equipment and production line. Relying on the R&D and manufacturing capability of precision machinery, we provide integrated customized processing services for die-cutting machine for lithium battery pole pieces from scheme evaluation, structure customization, mold matching, visual inspection and dust removal system to on-site debugging and long-term maintenance, which helps new energy enterprises stabilize the quality of production and improve the flexible production capacity of production lines.

Die-cutting of lithium electrode plate has strict requirements on tension control, cutting accuracy and dust control of equipment. The positive and negative pole pieces are composed of copper foil, aluminum foil and active coating. The material is thin and the coating is easy to fall off, and the tension fluctuation in the cutting process can easily cause the pole pieces to stretch, fold and deviate. Facing the special working conditions such as thick coating, high load, special-shaped lug and narrow sheet, the fixed die and belt structure of traditional standard equipment are prone to problems such as excessive burr, dust accumulation and long mold changing time. The core of customized development is to re-optimize the tape path, die-cutting actuator, tension closed-loop system and dust removal structure around the customer's battery product drawings, pole piece width, pole ear style and production beat, taking into account the cutting accuracy, feeding stability and dust collection efficiency, and adapting to different technical routes such as formula-shaped soft bags, columns and laminated batteries.

The first step of customized processing is pre-process docking and scheme design. The technical team deeply docked with the customer's R&D and process department, and confirmed the pole piece material, foil thickness, coating formula, cutting contour, production capacity target, workshop installation space, and upstream and downstream docking equipment interfaces. According to the design scheme of small batch sample production line, pilot production line and large-scale mass production line in the laboratory, the small test machine pursues small and flexible, convenient mold changing and meets the verification requirements of new materials; Mass production of high-speed models strengthens fuselage rigidity, servo synchronous control and continuous operation stability, and supports long-term uninterrupted production. The equipment structure is divided into unwinding unit, tension control unit, die-cutting and cutting unit, visual inspection unit, dust removal unit and receiving and sorting unit. Functional modules can be increased or decreased as required, such as on-line CCD size detection, burr sampling, NG automatic rejection, pole piece stacking and receiving, diaphragm protection and other functions, so as to avoid unnecessary configuration from raising the equipment cost.

Core cutting and die system are the key points of customization, and the pole piece technology is strictly matched. Die-cutting dies are made of high-performance die steel. After precise grinding and heat treatment, the die gap is controlled, the cutting burr is stably controlled within the industry standard, and the peeling of active substances is reduced. For the production line of high-frequency mold changing, the quick-change mold frame structure is adopted to reduce the calibration time of mold disassembly; For special arc-shaped pole pieces, multi-pole pieces connected in parallel, and notched special-shaped pole pieces, a customized die is developed separately to ensure the consistency of the outline of each batch of pole pieces. Multi-stage servo tension closed-loop control is adopted in the tape transport system to distinguish multi-stage tension before unwinding, cutting and winding, so as to reduce the tensile stress for thick coated pole pieces with high adhesion and prevent the coating from peeling off; Aiming at ultra-thin foil pole piece, tension fluctuation is reduced, and tension deformation of pole piece is avoided.

Dust removal system is an indispensable part of customized scheme. The active powder produced by pole piece cutting has strong conductivity, and it is accumulated in guide rails, servo motors and electrical cabinets, which is easy to cause short circuit and jamming. In the customized processing stage, the negative pressure dust suction structure is designed according to the die-cutting position and feeding speed, the dust suction port is close to the cutting edge, the pipeline direction is optimized, and the dead angle of dust accumulation is reduced. With the functions of dust concentration monitoring and filter element pressure difference alarm, dust overflow is prevented from polluting the workshop and pole pieces. The electrical control system is customized and developed synchronously, and MES interface is reserved, which can upload the production count, yield data, equipment alarm and cutting parameters to the factory digital system, realize the traceability of production data, and meet the requirements of intelligent manufacturing and quality control in lithium battery industry.

Before the whole machine leaves the factory, the long-term copying and sample trial cutting verification are completed in the factory, the process debugging is carried out by using the customer's incoming materials, the cutting speed, tension parameters, dust removal air volume are optimized, the repeated positioning accuracy, dimensional tolerance and burr level are verified, and the products are disassembled and delivered after all the indicators meet the standards. In the field installation and debugging stage, the engineer rechecks the docking height and delivery rhythm of the production line, and calibrates the upstream and downstream linkage time sequence to avoid the interference of receiving and feeding; Simultaneously carry out training for operation and maintenance personnel, explain mold replacement, tension parameter adjustment, dust removal and maintenance, daily routine inspection specifications, and deliver electrical drawings, spare parts list and process parameter files. At the same time, a long-term after-sales response mechanism is established to support remote debugging, on-site maintenance, mold repair and iterative upgrade, and the equipment transformation can be quickly completed when customers develop new batteries.

The new energy track continues to iterate, the battery material and structural scheme are constantly updated, and the flexibility of production line equipment has become the key to enterprise competition. The customized processing of die-cutting machine for lithium battery pole pieces is not only a simple modification of the overall dimensions of the equipment, but also a process-oriented, all-round adaptation to the individual needs of customers from the aspects of mechanical structure, control logic, dust removal matching and data interaction, so as to solve the pain points of standard equipment process mismatch, slow model change and large yield fluctuation.

In the future, we will continue to deeply cultivate the customized track of lithium battery production equipment, constantly optimize the tension control, precision cutting and online detection technologies, improve the compatibility of equipment, and adapt to the development needs of new energy storage batteries such as lithium battery and sodium battery, so as to help new energy enterprises accelerate the iteration of new products, stabilize product quality and empower the high-quality development of new energy industry with customized and highly reliable pole piece die-cutting equipment.