Introduction to the structural characteristics of soft-pack lithium-ion batteries and cylindrical lithium-ion batteries

The structural characteristics of soft-pack lithium-ion batteries The key materials used in soft-pack lithium-ion batteries: positive electrode materials, negative electrode materials, and separators are not much different from traditional steel-case and aluminum-case lithium-ion batteries. The biggest difference lies in the soft packaging materials. This is the most critical and technically difficult material in soft-packed lithium-ion batteries. The packaging material and structure of the soft pack lithium-ion battery give it a series of advantages. According to the summary of the public account of the electric zhijia, for example, the safety performance is good. The soft pack battery is structured with aluminum-plastic film packaging. Batteries generally swell and rupture, and do not explode like steel or aluminum cells. Lightweight, the soft-pack lithium-ion battery is 40% lighter than the steel-case lithium-ion battery of the same capacity, and 20% lighter than the aluminum-case lithium-ion battery; the internal resistance is small, and the internal resistance of the soft-pack battery is smaller than that of the lithium-ion battery. Greatly reduce the self-consumption of the battery; good cycle performance, longer cycle life of the soft pack battery, 100 cycles attenuation less than 4% to 7% than the aluminum shell; flexible design, variable shape, can be thinner, can be Customize according to customer needs and develop new battery cell models. The shortcomings of soft-packed lithium-ion batteries are poor consistency, high cost, and easy leakage. High cost can be solved by large-scale production, and liquid leakage can be solved by improving the quality of aluminum plastic film. Structural characteristics of cylindrical lithium-ion batteries Cylindrical lithium-ion batteries are a common form of battery structure. Ni/MH, lithium ion batteries, etc. all have a cylindrical structure, and the newly developed power lead-acid battery also has a cylindrical structure. Cylindrical lithium-ion batteries have formed a series of internationally unified standard specifications and models, and the technology is relatively mature and suitable for continuous mass production. The cylindrical lithium-ion battery shell has high pressure resistance, and there will be no phenomena such as square, flexible packaging battery expansion during use. (1) A common cylindrical lithium-ion battery is composed of an outer shell, a cap, a positive electrode, a negative electrode, a separator, and an electrolyte. Generally, the battery case is the negative electrode of the battery, the cap is the positive electrode of the battery, and 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. Cylindrical lithium-ion batteries generally have a relatively high degree of pressure resistance. For example, conventional Ni-MH D-shaped cylindrical batteries, the opening pressure of the safety valve is generally 1~3MPa, so when the battery has safety problems, the possibility of explosion is greater . Lithium-ion battery packs made of cylindrical batteries will have a larger volume. 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. Previous: Do you know the correct use of 18650 lithium-ion batteries?