The soft pack lithium battery is just the liquid lithium ion battery covered with a polymer shell. In the structure, the aluminum-plastic film packaging is used, and the soft-packed battery will only be vented and cracked in the event of a safety hazard.

　　Soft pack lithium battery parameters

　　Nominal voltage: 3.7V

　　Working voltage: 2.4~4.2V

　　The advantages of soft pack lithium battery

　　1. Good safety performance The soft-pack battery is structured with aluminum-plastic film packaging. In the event of potential safety hazards, the soft-pack battery will only swell and crack at most, unlike the steel shell aluminum shell battery cell that will explode.

　　2. Lightweight soft pack battery is 40% lighter than steel shell lithium battery of the same capacity, and 20% lighter than 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 soft-pack batteries is lower than that of lithium batteries. At present, the minimum internal resistance of domestic soft-pack battery cells can be less than 35mΩ, which greatly reduces the self-consumption of the battery.

　　5. The shape of the flexible design of the soft pack battery can be customized according to the needs of customers, and new battery cell models can be developed.

　　The disadvantages of soft pack lithium battery

　　The existing soft pack battery cell models are few and cannot meet the market demand;

　　The cost of developing new models is high.

　　Lithium battery production process:

　　The first step--preparation of electrode slurry

　　is mainly to mix electrode active materials, binders, solvents, etc. together, stir and disperse sufficiently to form a slurry.

　　The second step-coating

　　The slurry prepared in the first step is uniformly coated on the current collector (aluminum foil or copper foil, etc.) with a specified thickness, and the solvent is dried.

　　The third step-pole piece punching

　　Punch the pole piece produced in the previous step into the specified size and shape.

　　The fourth step-stacking

　　Assemble the positive and negative plates and the separator together, and form the pole core after the glue is applied.

　　Step 5-Assemble the soft pack battery

　　Put the pole core produced in the previous step into the aluminum-plastic film that has been flushed, and complete the top seal, side seal, etc. (and leave a mouth for injection) to form a soft pack battery without injection.

　　The sixth step-injection

　　Inject a specified amount of electrolyte into the soft-pack battery cell. Of course, the battery cell needs to be baked, and the liquid injection operation is carried out in a low humidity environment, too much moisture content is not good.

　　Step 7-battery sealing

　　The gas inside the cell is drawn out and sealed in a vacuum environment.

　　With the rapid development of electric vehicles and automobiles, the power supply on vehicles has also developed rapidly. However, there are many problems in the production of batteries, resulting in uneven quality of battery products in the market and the later cycle life of battery capacity. Failure to reach the designed service life has a lot to do with the unique production process of the battery in production. The structure of the battery is composed of a shell, an upper cover, a pole plate, a separator, a bus bar, a pole, a bridge protection plate, and a terminal.