Introduce the winding type lithium ion battery structure and advantages and disadvantages

Source: 2020 - 04 - 10 17:927 hits: time wound type lithium ion battery technology in the structure, advantages and disadvantages of the invention relates to a lithium battery and its manufacturing method, belonging to field of battery, especially relates to a kind of quick charge, is greater than the power of lithium battery and its manufacturing method. Technical background at present, there are mainly two kinds of structure forms of square lithium ion battery, one is the winding type, its advantages are simple structure, only have a positive and a negative electrode and the battery is greater than the energy, the downside is, stem length, battery resistance is large, go against large current charge and discharge, than power is small; Is another kind of fold type, its advantage is very short, battery internal resistance is relatively small, be helpful for large current charge and discharge, the disadvantage is that the battery pole piece, produce more of the material, the production efficiency is low, in addition, the multilayer thin plate welding is difficult, especially multilayer cathode, with good electrical conductivity, copper foil and copper foil is not good for resistance welding, copper foil high melting point, unfavorable and ultrasonic welding, can empty welding, welding without company, may also be a part of welding, weld damage or part of the welding is broken, a virtual welding and welding, will make some negative doesn't work, battery capacity is low, what's more, the positive effects and negative does not work, use lithium production safety accidents in the process. Battery is small in size, volume is small, not suitable for lamination production, such as lox20mm, - 50 mah batteries, because of small volume, operating difficulties. At present, the cylindrical lithium ion battery is a kind of winding structure, it has the advantages and disadvantages of winding structure. Local welding pole winding structure, adopting the ear, large current charge and discharge, regardless of the pole piece uniform coating, uneven distribution of current density is inevitable, large current charging ratio, the uneven distribution of charging current, lithium ion in cathode electronic speed, but the diffusion of lithium ions in the cathode active material speed control steps, due to the diffusion is not timely, easy to form lithium, especially in the current distribution in the densely populated place, so prone to accidents; Lithium lithium or precipitation into death, battery capacity is easy to decay, short cycle life. Power type lithium ion battery with high power for charging and discharging cycle, cycle is short, life cycle after security becomes poor, it is for this reason.