In order to improve the energy density, life and safety of the battery cells, in the future battery manufacturing process, the cylinder cells will still be the main winding process, while the prismatic cells and pouch cells will mainly use the stacking process. However, at present, there are two main problems in restricting the large-scale promotion of stacked cells: 1) The manufacturing efficiency is relatively low. 2) The manufacturing qualification rate is relatively low. Taking the Z-shape stacking process as an example, there are currently four problems in the application of battery electrode stacking machines to battery manufacturing: First, there will be wrinkles in the battery separator. These wrinkles will bring risks after cycling inside the battery and damage the performance of the battery. Second, it will cause irreversible deformation of the battery separator. Third, additional auxiliary time will be spent. Fourth, since the quality of stacked electrodes cannot be inspected in real time, the overall performance can only be judged after the battery electrodes are stacked. The above four problems limit the large-scale application of Z-shaped battery electrode stacking machines. However, for another electrode composite stacking process, although it can overcome the problems of the Z-shaped stacking process to a certain extent, it also has its own shortcomings: The battery winding and stacking integrated machine faces the limitation of the winding motor and is not suitable for the production of large cells. The stack structure of the battery electrode composite stacking machine will bring structural risks, because the composite unit is cut into a single piece, and the single piece will have problems such as the folding of the battery separator during the transportation process, which leads to safety risks in the battery cell. In summary, battery electrode stacking machines need to further improve stacking efficiency and pass rate to meet the needs of high-end battery production. WinAck Group can provide various types of battery electrode stacking machines according to customer's technical requirements. Come by, contact us for a solution that can help you succeed. For better batteries, Win & Ack!

The pouch cell tabs are compounded by heat adhesive film and metal strips. The heat adhesive film of pouch cell tabs is usually composed of three layers of materials by hot pressing together, including a middle framework layer and two surface modified PP layers, and the modified PP materials on the two surfaces are the same. Of course, there are some exceptions. For example, the single-layer modified PP composition produced by Toppan and Showa and the five-layer tab heat adhesive produced by ZACROS. For another example, in order to pursue ultra-high bonding strength between the adhesive layer and the metal tape, Hitachi and ZACROS have different modified PP materials on the two surfaces. One side is metal-philic modified PP, and the other surface is plastic-philic modified PP. This kind of heat adhesive, once the surface of the heat adhesive is reversed when making the pouch cell tabs, it will inevitably cause the battery cell to leak and swell. 1) Pouch cell tabs with black heat adhesive VS Pouch cell tabs with yellow heat adhesive 1.1) Pouch cell tabs with black heat adhesive DNP's pouch cell tabs with black heat adhesive are composed of PEN functional layer and PPa layer. There are many interfaces between different substances, and it will peel off after being soaked in electrolyte. The PEN functional layer has a melting point of 265°C, and the PPa layer has a melting point of 147°C. And there are 3 kinds of substances with different melting points in the PPa layer, melanin: 66℃, PE: 105℃, PP: 167℃, the interfaces are more unstable. 1.2) Pouch cell tabs with yellow heat adhesive The melting point of the yellow heat adhesive functional layer itself is above 300℃, so it will be better to operate during heat sealing. The PEN functional layer in the middle uses a non-woven fiber layer instead of the original polyethylene naphthalate. The interface fusion is better than black heat adhesive, but it still cannot solve the problem of complete fusion between different substances. Due to its own PPa layer technology, yellow heat adhesive will become extremely hard and lose flexibility after heat sealing. It is easy to cause the tab heat adhesive and tab metal to break when the battery is packaged and later processing (transferring nickel, adding plates). As a result, the battery leaks, swells, and so on. 2) Pouch cell tabs with yellow heat adhesive VS Pouch cell tabs with white heat adhesive The white heat adhesive is co-extruded by three layers of PP materials with different functions. The heat-sealing temperature of the functional layer is 165~167℃, which is slightly lower than the battery packaging temperature (180~220℃), which can effectively prevent the short-circuit problem of the section. The operating temperature range during battery packaging is increased, and the yield rate of battery production is improved. Since the materials used in the 3 functional layers belong to the same kind of material (PP), the white heat adhesive can still ma...

Lithium-ion battery tabs are a component of pouch cells, so they are also called pouch cell tabs. The battery cell contains a positive electrode and a negative electrode. The battery tabs are the metal conductors drawn from the positive and negative electrodes in the battery cell, and are the connection points for charging and discharging the battery. The battery tabs are compounded by heat adhesive and metal strips. 1) According to the material of the metal strips of the battery tabs, the battery tabs can be divided into three categories: 1.1) Aluminum battery tabs The Al battery tabs are usually used as the positive electrode tabs of the battery. If the battery's negative electrode material is lithium titanate, it can also be used as a negative electrode battery tabs. 1.2) Nickel battery tabs The Ni battery tabs are usually used as the negative electrode tabs of the battery. The Ni battery tabs are mainly used in small digital batteries, such as mobile phone batteries, mobile power bank batteries, tablet batteries, smart wearable device batteries, etc. 1.3) Nickel-plated copper battery tabs The Ni-Cu battery tabs are usually used as negative electrode tabs of the battery, which are mainly used in power batteries and high-rate batteries. 2) According to the material of the heat adhesive of the battery tabs, the battery tabs can be divided into three categories: 2.1) Battery tabs with black heat adhesive The heat adhesive of the battery tabs is black, which is usually used for digital batteries. 2.2) Battery tabs with yellow heat adhesive The heat adhesive of the battery tabs is yellow, which is usually used for power batteries and high-rate batteries. 2.3) Battery tabs with white heat adhesive The heat adhesive of the battery tabs is white, which is usually used for digital batteries, power batteries and high-rate batteries. WinAck Group can provide various types of lithium-ion battery tabs with customizable sizes. Come by, contact us for a solution that can help you succeed. For better batteries, Win & Ack!