1. The difference of electrolyte between 18650 lithium battery and soft pack lithium battery
As the two mainstream lithium batteries in the current market, 18650 lithium battery and lithium polymer soft pack battery are distinguished according to the shell packaging material. 18650 lithium battery is generally enclosed in a steel shell (18 means diameter of 18mm, 65 means length of 65mm, and 0 means cylindrical battery). The structure of the internal electrode sheet and the separator are twirled. Aluminum plastic film is used for the outer packaging of lithium polymer flexible battery, and the internal electrode sheet and separator are stacked (stacked layer by layer).
The main difference between 18650 lithium battery and soft pack lithium battery lies in the different shapes of the electrolyte in the internal materials of the battery: the electrolyte in lithium polymer soft pack battery is polymer, generally gel or solid, while the electrolyte in 18650 lithium battery is generally liquid.
2. The application fields of 18650 lithium battery and soft packe lithium battery are different
At present, 18650 lithium battery has high degree of automatic production, and its consistency and safety have reached a high level. In addition, the battery itself is small in size and light in weight, so it has unique advantages in the modularization and standardization of system development. Many people believe that adopting 18650 lithium battery as the power source of new energy electric vehicles is a better choice at this stage.
Compared with 18650 lithium battery, lithium polymer soft pack battery has higher single capacity, and has the advantages of being thinned, having an arbitrary area and having an arbitrary shape (ultrathin batteries of 0.33mm, 0.50mm and other models can be manufactured). Based on the characteristics of lithium polymer soft pack batteries, lithium polymer soft pack batteries are increasingly used in mobile phones, notebook computers, mobile power supplies and other fields.
3. The high current discharge performance of 18650 lithium battery is different from that of soft pack lithium battery
In terms of the high current discharge performance of the lithium battery, soft pack lithium battery can achieve higher rate than 18650 lithium battery. Meanwhile, in terms of the high current discharge stability performance, soft pack lithium battery has better performance. In terms of the same discharge requirements and capacity, the soft pack lithium battery can be customized according to the space shape of the product battery compartment to achieve a more portable form.