Why is aluminum foil used for the cathode? It is mainly divided into three aspects. The first is the electrochemical aspect. As a metal material, aluminum has a middle activity. It will form an aluminum oxide protective film in the air, which has high electrochemical potential and good corrosion resistance; secondly, in terms of mechanical properties , easy to process, good mechanical strength, weldable and riveted, and good thermal and electrical conductivity; again in terms of cost, the reserve is large, the cost is low, it is not a heavy metal, and it is not a strategic resource; therefore, it has been used as a collector of cathode electrodes for so many years. 2) Inspection of aluminum foil: The inspection of incoming materials by general battery companies includes outer packaging, appearance, thickness, width, areal density, material, welding performance, tensile strength, elongation, etc., depending on the thickness and material of aluminum foil. There are internal testing standards, and the testing is relatively simple, so I won’t go into details here. 3) The technological development of aluminum foil: With the improvement of the energy density of power batteries, the aluminum foil as the current collector is getting thinner and thinner, so it is required to have lower impurity content, less self-discharge, better thickness uniformity, Higher surface tension, better bonding performance, thinner thickness, higher strength, higher conductivity, suitable elongation and other requirements. At the same time, in order to increase the content of active substances, aluminum foil surface coating technology It is also developing very quickly. The following will briefly introduce these new technologies. A. Coating technology: The use of functional coatings for surface treatment of battery conductive substrates is a breakthrough technological innovation. Carbon-coated aluminum foil is to coat dispersed nano-conductive graphite and carbon coated particles uniformly and delicately On aluminum foil. It can provide excellent static electrical conductivity, collect the micro current of the active material, which can greatly reduce the contact resistance between the material and the current collector, and can improve the adhesion between the two, which can reduce the use of adhesives In turn, the overall performance of the battery is significantly improved. B. Porous aluminum foil: With the development of technology, porous aluminum foil technology has also emerged, which can carry more active materials and make the contact between active material particles closer. As far as the current technology is concerned, porous aluminum foil has not been applied in large quantities, and there are still problems in coating, low tensile strength, rolling press broken tape, and large burrs leading to large self-discharge. Further research and solutions are needed. There are some small soft package data that can significantly increase the energy density, but we believe ...

Today we finally finished our American customer 18650 cell PVC film shrink wrap machine. After we discuss with our customer server days and then we had a big improve of the machine safety part. This machine product rate can arrive 50 ppm, with high effective accurate and high safety. This battery PVC film wrapping machine have automatic film feeding and automatic battery feeding function. Just need manually received the battery that been filmed. And we can also provide automatic battery clean function and automatic battery feeding. And if you want add any other function, we can also customized. Performance characteristics of automatic 18650 cell PVC film shrink wrap machine: 1. The whole box of batteries is put into the battery tray, and the battery is automatically sucked out by a powerful magnet. 2. A single battery is fixed by a precision clamp on the conveyor belt, and the positioning is accurate. 3. The whole roll of casing is automatically discharged, and the casing is automatically fed by a stepping motor from the vertical direction, and the casing is automatically cut. 4. Set up multiple bushings and battery positioning devices to ensure the accuracy and consistency of the battery bushings. 5. The automatic battery PVC film covering machine has a scientific and reasonable design of the heating air duct. A single battery can rotate in the heating zone to ensure uniform shrinkage of the casing. 6. The fully automatic battery wrapping machine adopts programmable controller PLC to realize fully automatic control, the machine runs stably and the degree of automation is high. We are TOB New Energy,we are not only provide the equipment of the battery,but also provide the knowledge of battery. Contacts: Miss carol(Sales&Engineer) E-mail:tob.mae@tobmachine.com Skype:583432443@qq.com Wechat:TOB-005

Electrolytic copper foil is an important material for the manufacture of copper clad laminates (CCL), printed circuit boards (PCB), and lithium-ion batteries. In today's rapid development of the electronic information industry, electrolytic copper foil is called the "neural network" of electronic product signal and power transmission and communication.Why use copper foil for anode electrode of lithium battery? 1. Copper and aluminum foil has good conductivity, soft texture and low cost. 2. Copper foil and aluminum foil is relatively stable in the air. 3. The positive and negative potentials of lithium batteries determine the aluminum foil for the cathode electrode and the copper foil for the anode electrode. TOB NEW ENERGY LIMITED is specialized in lithium battery industry, our company can provide you a turnkey project, if you are interested in it, feel free to contact us! Contact person:Gavin Zhu (Engineer & Sales) Email:tob.gavin@tobmachine.com Skype: tob.gavin@tobmachine.com Wechat: TOB-007

The Aluminum laminated film is mainly a composite material composed of ON/AL/CPP (outer nylon layer/middle aluminum foil layer/inner heat-sealing layer), and the layers are bonded by an adhesive. Aluminum laminated film is one of the key materials for pouch cell lithium battery packaging.It plays a role in protecting the internal battery cell material. It has strict requirements in terms of barrier properties, cold stamping formability, puncture resistance, chemical stability and insulation. Compared with cylindrical and square aluminum shells, soft-pack batteries have obvious advantages in energy density, safety and flexibility, and have been widely used in 3C consumer, new energy vehicles and energy storage fields. TOB NEW ENERGY provide battery Aluminum laminated film pouch cell packaging materials for lithium-ion polymer pouch cell cases. The functional structure of aluminum laminated film is generally 3 layers, including the outer nylon layer (ON layer), the middle aluminum foil layer (AL layer), and the inner heat seal layer (CPP layer or PP layer). The main raw materials include nylon, aluminum foil, and polypropylene. CPP and adhesives, etc. The outer ON layer protects the AL layer from scratches, and requires the outer material to be puncture-resistant and impact-resistant; the AL layer acts as a barrier to prevent moisture intrusion and block oxygen to protect the battery contents; the inner layer is an electrolyte-resistant layer to prevent leakage The electrolyte corrodes the AL layer, requiring high composite strength with the aluminum foil layer. The key to the production of aluminum laminated film is to press and bond the three layers of functional materials uniformly and firmly through adhesive additives between the layers. Therefore, the thickness of conventional aluminum laminated films on the market is generally divided into three levels of 88μm, 113μm, and 153μm, of which 88μm and 113μm are used for consumer electronics, and 153μm is used for new energy vehicle power lithium batteries and industrial energy storage fields. Contacts: Miss carol(Sales&Engineer) E-mail:tob.mae@tobmachine.com Skype:583432443@qq.com Wechat:TOB-005

The vacuum oven plays a particularly important role in the baking of materials, pole pieces, and batteries in the production process of lithium batteries.  It fully removes water and ensures the high performance of the battery. A batch of vacuum oven for the cylindrical lithium battery production line has been completed. They will be sent to the customer's factory soon. Vacuum ovens are widely used in chemical, electronics, food, light industry, medicine, and other industries, and can dry materials under vacuum. It has the advantages of fast drying speed, low pollution and no damage to the internal quality of the dried items. The special vacuum oven for lithium batteries is a vacuum oven specially designed for the baking process of lithium-ion batteries. Its working principle: the boiling point decreases with the decrease of air pressure. The boiling point of water is significantly reduced under negative pressure. When the pressure drops to -0.089Mpa, the theoretical boiling point can be reduced to 45°C. In a negative pressure environment, moisture is easier to vaporize. After the special oven for lithium battery is heated for a period of time under normal pressure, the moisture in the battery or pole piece is converted into water vapor; after the moisture evaporates, vacuum can be used to extract the water vapor; nitrogen is filled to break the vacuum to maintain a dry environment. In the actual baking process, the above three steps are different according to different processes, and generally require multiple cycles. TOB NEW ENERGY LIMITED is specialized in lithium battery industry, our company can provide you a turnkey project, if you are interested in it, feel free to contact us! Contact person:Gavin Zhu (Engineer & Sales) Email:tob.gavin@tobmachine.com Skype: tob.gavin@tobmachine.com Wechat: TOB-007

Recently we are customizing an extrusion coating machine for a customer for the cylindrical battery production line. The equipment will be completed soon and sent to the customer's factory. The key technology of high-speed, high-precision intelligent lithium battery coating machine mainly includes extrusion coating, fast drying, tension correction and real-time film thickness monitoring feedback closed-loop control. Optimization of extrusion coating die parameters through finite element simulation, using suspension drying technology and aerodynamic design technology to achieve rapid drying, tension correction adopts fully closed loop tension control and fully automatic EPC real-time correction. Comprehensive use of motion control, servo drive, sensors, computer technology and other disciplines and technologies, Realize the multi-functional composite integrated structure of unwinding, deviation correction, tension control, slurry conveying, coating, drying, winding, etc. TOB NEW ENERGY LIMITED is specialized in lithium battery industry, our company can provide you a turnkey project, if you are interested in it, feel free to contact us! Contact person:Gavin Zhu (Engineer & Sales) Email:tob.gavin@tobmachine.com Skype: tob.gavin@tobmachine.com Wechat: TOB-007

Today, one semi-automatic battery stacking machine will be sent to our customer, this battery stacking machine will be used for laboratory polymer lithium battery research. The stacking machine is generally composed of ten mechanisms, namely: feeding mechanism, positive electrodes box, negative electrodes box, positive secondary positioning mechanism, negative secondary positioning mechanism, positive electrodes feeding mechanism, negative electrodes feeding mechanism, laminating platform, paste glue mechanism, discharging mechanism. The working principle of the semi-automatic battery stacking machine is to load the positive and negative sheets into the material box, and the manipulator moves left and right to pick up the electrodes in the positive and negative material boxes. After the second positioning, the positive and negative plates are alternately placed on the lamination table . The separator unwinds actively, and the lamination table drives the separator to reciprocate left and right to form a Z-shaped stack. After the lamination is completed, it is cut according to the set length, the battery core is automatically sent out, and the glue is manually applied. By the way, we also have full automatic stacking machine or manual stacking machine, if you are interested in it, feel free to contact me. Thank you for reading! Contact person:Gavin Zhu (Engineer & Sales) Email : tob.gavin@tobmachine.com Skype : tob.gavin@tobmachine.com Wechat : TOB-007

The vacuum drying is to put the materials to be dried in an enclosed space, use vacuum equipment to reduce the air pressure in the enclosed space to an atmospheric pressure, and at the same time continuously heat the materials. In this way, the water molecules in the material gradually diffuse to the surface of the material due to the effects of pressure difference and concentration difference. After obtaining sufficient kinetic energy on the surface of the material, the binding of the intermolecular attraction is gradually overcome, and it escapes into the vacuum chamber of low pressure and then passes The vacuum pump is discharged into the atmosphere. Vacuum drying processes: The first is the heat transfer process, the material absorbs heat through the heat source, heats up and vaporizes the internal moisture; Secondly, in the process of liquid mass transfer inside the material, the water inside the material moves to the surface in the form of liquid, and then vaporizes on the surface; Finally, during the gaseous mass transfer process of the moisture on the surface of the material, the water vapor vaporized on the surface of the material gradually escapes into the inside of the vacuum chamber and flows to the outside through the vacuum chamber. To complete the above heat and mass transfer process, temperature, pressure and concentration are the key control factors; Temperature: The temperature of the heat source should be significantly greater than the temperature of the material to meet the energy required for its own temperature increase and vaporization of moisture. The higher the temperature, the faster the drying. Concentration: The so-called concentration refers to the concentration of moisture in the material. The internal concentration of the material is higher than the surface concentration of the material. Under the action of capillary force and concentration difference, it migrates to the surface and eventually reduces the concentration of moisture. Pressure: The steam pressure on the surface of the material is higher than the partial pressure of steam in the drying oven, which is the core theory of vacuum drying. Vacuum drying thermodynamics mainly studies the relationship between the vaporization temperature of water, the saturated vapor pressure and the degree of vacuum. The theoretical basis can be Clapron. Clausius formula expression The vaporization temperature of water is positively correlated with saturated vapor pressure and negatively correlated with vacuum degree. The smaller the saturated vapor pressure, the lower the vaporization temperature of water. Similarly, the greater the vacuum degree, the lower the vaporization temperature of water. Therefore, it can be seen that water is easier to achieve low-temperature vaporization in a vacuum environment. When the temperature is maintained at a certain value, increasing the vacuum in the drying chamber can convert more moisture on the surface of the material into water v...