#Inside a d battery serial number

#Inside a d battery serial number

The finished cell is labeled with a batch or serial number on the case. By applying a pressure profile to the cell (supply of inert gas and/or generation of a vacuum in alternating operation), the capillary effect in the cell is activated (wetting the separator). The electrolyte is filled with a high-precision dosing needle. This process is carried out in a dry room since moisture will cause the electrolyte to decompose with the emission of toxic gases. This is followed by filling the housed cell with the electrolyte and sealing it. The sub-assembly is then inserted into the cell housing (pouch or metal case, depending on the cell design) which is then sealed in a laser welding or heating process leaving an opening for injecting the electrolyte. In the next step, the assembled cell structure is connected to the terminals or cell tabs, together with any safety devices, using an ultrasonic or laser welding process.

Cell assembly is usually carried out on highly automated equipment. Two basic electrode structures are used depending on the type of cell case: stacking is done for pouch cells, and winding is done for prismatic and cylindrical cells. (Active materials, conductive additives, solvents, and binders, as well as the aluminum foil and copper foil, are usually purchased components for the cell manufacturer.)Īfter the electrodes have been prepared, they are sent to the dry room for the sub-assembly process where the separator is layered between the anode and the cathode to form the internal structure of the cell. The coils are then sent to a vacuum oven to remove the residual moisture and solvent. This process helps adjust the physical properties (bonding, conductivity, density, porosity, etc.) of the electrodes.Īfter calendaring, the finished electrodes are cleaned and fed into slitting machines to be cut into narrow strips and recoiled. This is followed by the calendaring process where the coated foils are compressed by a rotating pair of rollers. From the water-based anode coating, the harmless vapor is exhausted to the ambient environment directly.) (The highly flammable solvent contained in the cathode coating is recovered or used for thermal recycling. The coated foil is fed directly into a long drying oven to evaporate the solvent. The thickness of the electrode coating can be controlled in the coating machine. The slurry is then coated either continuously or intermittently on both sides of the current collector (Al foil for cathode and Cu foil for the anode) using an application tool (e.g. To avoid contamination between the two active materials, the anodes and cathodes are usually processed in different rooms.) (The anode material is a form of Carbon and the cathode is a Lithium metal oxide. The first stage is to mix the electrode materials with a conductive binder to form a uniform slurry with the solvent.