Introduction to the structure and size specifications of cylindrical lithium-ion batteries

The structure of the cylindrical lithium-ion battery At present, the cylinder is mainly based on the steel shell cylindrical lithium iron phosphate lithium-ion battery. The performance of this battery is high capacity, high output voltage, good charge and discharge cycle performance, stable output voltage, and large current. Stable discharge, electrochemical performance, safe use, wide operating temperature range, and environmentally friendly. The structure of a typical cylindrical lithium-ion battery includes: a positive electrode cover, a safety valve, a PTC element, a current cut-off mechanism, a gasket, a positive electrode, a negative electrode, a separator, and a casing. 1. Common cylindrical lithium-ion batteries are composed of a shell, a cap, a positive electrode, a negative electrode, a separator, and electrolyte. Generally, the battery case is the negative electrode of the battery, and the cap is the positive electrode of the battery. The battery case is made of nickel-plated steel plate. 2. The important difference of the power cylindrical battery is the conductive connection structure of the battery, because the power lithium battery generally uses a relatively large current, and requires a special high-current structure design. In order to facilitate the combination and connection, on the basis of the original cylindrical lithium-ion battery structure, a special connection combination device is designed, such as designing internal threads or studs on the positive and negative electrodes of the battery, and the conductivity is also enhanced. Cylindrical lithium-ion battery size specification introduction Because the 18650 cylindrical lithium-ion battery has a long history, the market penetration rate is very high. The cylindrical lithium-ion battery adopts a fairly mature winding process, high degree of automation, stable product quality, and cost. relatively low. Cylindrical lithium-ion battery cell: usually represented by five digits. The first two digits refer to the diameter of the cell body, and the last three digits refer to the cell body height. For example, 14500 refers to an AA battery, which is approximately 14mm in diameter and 50mm in height. Common models: 14500, 14650, 17490, 18500, 18650, 26500. Cylindrical lithium-ion batteries are divided into lithium cobalt oxide, lithium manganese oxide, and ternary materials. The three material system batteries have different advantages. The batteries are widely used in: notebook computers, digital cameras, lighting fixtures, toy products, power tools, portable mobile energy and other fields. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.