In recent years, the rapid development of new energy vehicles has driven the development of the entire lithium battery industry. The production of plasma cells is closely linked by one process step. Generally speaking, the production of lithium batteries includes three parts: pole piece manufacturing, battery cell manufacturing, and battery assembly. There are several key processes in these three major processes, and the performance of batteries produced by different production processes varies greatly. Adding plasma cleaning to the three manufacturing processes can greatly improve the battery manufacturing process level.
Plasma applications in the lithium battery industry
One is the treatment of the aluminum foil and copper foil before the coating of the positive and negative plates ;
The positive and negative plates of the lithium battery are coated with lithium on a thin metal strip The battery is made of positive and negative electrode materials. When the metal thin strip is coated with the electrode material, the metal thin strip needs to be cleaned. The metal thin strip is generally thin aluminum or copper. The original wet ethanol cleaning is easy to cause damage to other parts of the lithium battery. damage. The plasma dry cleaning machine effectively solves the above problems.
Lithium battery pole piece
The surface of aluminum foil metal often has grease, oil and other organic matters and oxide layers. Before sputtering, painting, bonding, welding, brazing and PVD, CVD coating, it is necessary Carry out cleaning treatment to get a completely clean and oxide-free surface. However, most of the prior art uses chemical cleaning methods, which require solvents, are not environmentally friendly, and are prone to " hydrogen embrittlement" phenomenon, the decontamination effect is not ideal, the decontamination speed is slow, and easily affects the mechanical properties of the aluminum foil.
The first problem solution: aluminum foil copper foil corona machine (roll-to-roll plasma cleaning machine)
aluminum foil corona machine
equipment is mainly composed of unwinding unit, corona unit, winding unit, It is composed of ozone reduction unit, correction unit, tension unit and control unit. Through continuous corona on the front and back of the foil, the surface wettability of the aluminum foil is improved, and the dyne value of the aluminum foil is improved, so as to prepare for the next step.
The second is the treatment of battery tabs before spot welding of battery assembly
Automotive power lithium-ion battery cell processing is an important part of the production and assembly process. Cell processing includes cell edge sealing and tab finishing. flat. Plasma cleaning is performed after the tabs are leveled, which can remove organic matter and tiny particles and improve the reliability of subsequent laser welding.
Car power lithium batteries are divided into positive and negative poles. The tabs are the metal strips that lead the positive and negative poles from the battery core. In layman's terms, the ears of the positive and negative poles of the battery are the contact points during charging and discharging. Whether the surface of this contact point is clean will affect the reliability and durability of the electrical connection.
Lithium battery assembly spot welding pretreatment
Automotive power Lithium battery cells are often uneven, bent or even twisted during the delivery process, which will cause false welding during welding , False welding, short-circuit and other phenomena. After the cell tabs are flattened, a plasma cleaning processor is used to remove impurities such as organic matter and fine particles on the tab surface, and the welding surface is roughened to ensure a good tab welding effect.
Third, in order to prevent safety accidents of lithium batteries, it is generally necessary to apply glue to the lithium battery cells.
to play the role of insulation, to prevent the occurrence of short circuits, protect the circuit, and prevent scratches. Before the battery module is assembled, plasma cleaning ( plasma clean) is required. The main purpose is to remove surface dirt and improve surface energy. This is to prepare for the next gluing process.
The latter two solutions:
rotary jet plasma cleaning machine
rotary jet plasma cleaning machine
can be customized into various styles, widely used in mobile phone shell printing in the electronics industry, Pre-treatment of coating and dispensing, surface treatment of mobile phone screens: cleaning and cleaning the surface of aerospace connectors in the defense industry,Screen printing, transfer printing front processing in general industry, etc.
Features
can be equipped with multiple types of nozzles, used in different occasions, to meet the processing environment of various products
The equipment is small in size, convenient to carry and move, and save customer space
can be In-Line It can be installed in the customer’s equipment production line to reduce customer input costs
Low maintenance cost, convenient for customer cost control
Rely on the "5 functions" of the active particles in the plasma to enhance bonding, bonding, welding, coating The effect of covering, binding and removing glue. Through plasma treatment of these contaminants on the surface of the material, the performance and service life of the lithium battery can be significantly improved.
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