Which one is better for soft pack lithium batteries than aluminum shell lithium batteries?

1. Soft pack lithium battery Soft pack lithium battery The soft pack lithium battery is a liquid lithium battery covered with a polymer shell. The biggest difference from other batteries is the soft packaging material (aluminum-plastic composite film), which is also a soft pack lithium battery The most critical and most technically difficult material in the field. Flexible packaging materials are usually divided into three layers, namely outer barrier layer (usually an outer protective layer composed of nylon BOPA or PET), barrier layer (middle layer aluminum foil) and inner layer (multifunctional high barrier layer). The packaging materials and structure of the soft-packed lithium battery make it have the following series of advantages: 1. Good safety performance The soft-packed lithium battery is structured with aluminum-plastic film packaging, and the soft-packed battery will only swell at most in the event of a safety hazard. Crack, unlike the steel shell aluminum shell cell will explode. 2. 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 battery. 3. The capacity of a large-capacity soft pack battery is 10~15% higher than that of a steel shell battery of the same size and 5~10% higher than that of an aluminum shell battery. 4. Small internal resistance The internal resistance of the soft-pack battery is small. At present, the minimum internal resistance of the domestic soft-pack battery cell can be less than 35mQ, which greatly reduces the self-consumption of the battery. 5. Flexible design. The shape of the soft pack battery can be customized according to the needs of customers, and new battery cell models can be developed. Especially in the shape of the shape, various irregular rectangular batteries can be customized, which can well meet the current smart wearable electronics. Equipment requirements. 2. Square lithium battery Square lithium battery usually refers to aluminum shell or steel shell square battery. The popularity of square battery is very high in China. With the rise of automobile power lithium-ion battery in recent years, the contradiction between automobile mileage and battery capacity It is becoming increasingly obvious that domestic power lithium battery manufacturers mostly use square aluminum shell lithium batteries with higher battery energy density, because the structure of square batteries is relatively simple, unlike cylindrical batteries that use high-strength stainless steel as the shell and have explosion-proof safety valves. And other accessories, so the overall accessory weight should be lighter, and the relative energy density is higher. The square battery adopts two different processes: winding and lamination. Square lithium batteries But because square lithium batteries can be customized according to the size of the product, there are thousands of models on the market, and because there are too many models, it is difficult to unify the process. There is no problem using square batteries in general electronic products, but for industrial equipment products that require multiple series and parallel connections, it is best to use standardized processing cylindrical lithium batteries, so that the processing technology is guaranteed, and it will be easier to find replacements in the future. battery. In general, prismatic batteries and soft-pack batteries have their own advantages and disadvantages. Each battery has its own dominant category. For example, there are more lithium iron phosphate batteries in prismatic batteries, and more ternary batteries in soft-pack batteries. some. With the introduction of the new subsidy policy for new energy vehicles, the system energy density of the battery has become an important assessment indicator. For example, the new subsidy policy requires pure electric passenger vehicles to have a driving range of not less than 200 kilometers, battery system energy density to be higher than 85Wh/kg, and the total mass of the battery system to account for no more than 20% of the vehicle's curb weight. These all indicate that the subsidy is towards weight. The direction of the ternary battery that is lighter and has a higher cruising range has changed. The capacity of the ternary soft pack battery is 10-15% higher than that of the steel shell lithium battery of the same size and 5-10% higher than the aluminum shell battery, but the weight is lighter than the steel shell battery and aluminum shell battery of the same capacity specification. Therefore, subsidies The New Deal is more beneficial to the ternary soft pack battery. 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: Can the lithium battery of the sweeping robot be replaced? How to replace