What are the structural characteristics of soft-pack lithium batteries and cylindrical lithium batteries?

The structural characteristics of the soft-pack lithium battery The key materials used in the soft-pack lithium battery positive electrode material, negative electrode material and separator are not much different from the traditional steel shell and aluminum shell lithium battery. The biggest difference lies in the soft packaging material, which is soft. The most critical and technically difficult material in lithium batteries. The packaging material and structure of the soft-pack lithium battery make it have a series of advantages. According to the summary of the public number of the electric zhijia, for example, the safety performance is good. The soft-pack battery adopts aluminum-plastic film packaging in the structure. When a safety problem occurs, the soft-pack battery Generally, it will swell and rupture, instead of exploding like a steel shell or aluminum shell battery cell. Lightweight, the weight of the soft-pack lithium battery is 40% lighter than the steel-shell lithium battery of the same capacity, and 20% lighter than the aluminum-shell lithium battery; the internal resistance is small, and the internal resistance of the soft-pack battery is smaller than that of the lithium battery, which can greatly reduce the battery The self-consumption of electricity; good cycle performance, longer cycle life of the soft-pack battery, 100-cycle attenuation is 4% to 7% less than that of the aluminum shell; flexible design, variable shape, thinner, can be customized according to customer needs Customize and develop new battery cell models. The disadvantages of soft-packed lithium batteries are poor consistency, high cost, and easy leakage. High cost can be solved by large-scale processing, and liquid leakage can be solved by improving the quality of aluminum plastic film. Structural characteristics of cylindrical lithium batteries Cylindrical lithium batteries are a common form of battery structure. Ni/MH, lithium batteries, etc. have a cylindrical structure, and the newly developed power lead-acid battery also has a cylindrical structure. Cylindrical lithium batteries have formed a series of internationally unified standard specifications and models. The technology is relatively mature and suitable for continuous processing in large quantities. The cylindrical lithium battery shell has high pressure resistance, and there will be no phenomena such as square, flexible packaging battery expansion during use. (1) Common cylindrical lithium storage batteries are composed of a 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, 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 lies in the conductive connection structure of the battery, because the power lithium-ion battery generally uses a relatively large current, and requires a special high-current structure design. Cylindrical lithium batteries generally have a relatively high degree of pressure resistance. For example, conventional nickel-hydrogen 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 battery packs made of cylindrical batteries will have a larger volume. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to buy lead-acid batteries for electric vehicles?