What is the production process of lithium-ion battery soft pack cells.

What is the production process of lithium-ion battery soft pack cells.

Soft pack lithium battery cells are heat sealed, while metal shell battery cells are generally welded (laser welding). The reason why soft pack battery cells can be heat sealed is that they use aluminum-plastic packaging film as a material.

Step 1- Preparation of Electrode Slurry
The important thing is to mix the electrode active material, binder, solvent, etc. together, stir and disperse them thoroughly, and form a slurry;

Step 2- Coating
Apply the slurry prepared in the first step uniformly onto a current collector (such as aluminum foil or copper foil) with a specified thickness, and dry the solvent;

Step 3- Pole Punching
Punch the polarizer produced in the previous step into the specified size and shape;

Step 4- Stacking
Assemble the positive and negative electrode plates and the diaphragm together, and after the adhesive is applied, form the electrode core;

Step 5- Assemble the soft pack battery
Insert the electrode core produced in the previous step into the aluminum-plastic film that has already been punched, and complete the top seal, side seal, etc. (leaving a hole for liquid injection) to form an unfilled soft pack battery;

Step 6- Inject Fluid
Inject a specified amount of electrolyte into the interior of the soft pack battery cell;

Step 7- Battery Sealing
Extract and seal the gas inside the battery cell in a vacuum environment.

Advantages of soft pack lithium-ion batteries:
1. Good safety performance. The soft pack lithium-ion battery pack is structurally packaged with aluminum-plastic film. In the event of a safety hazard, the soft pack battery will only burst and crack at most, unlike steel and aluminum shell battery cells that can explode.

2. Lightweight, soft pack lithium-ion batteries are 40% lighter than steel shell lithium-ion batteries of the same capacity and 20% lighter than aluminum shell batteries.

3. Large capacity, the lithium-ion battery pack soft pack has a capacity 10-15% higher than steel shell batteries of the same size, and 5-10% higher than aluminum shell batteries.

4. Low internal resistance: The internal resistance of soft pack batteries is lower than that of lithium-ion batteries. Currently, the minimum internal resistance of domestic soft pack battery cells can be below 35m, greatly reducing the battery's self consumption.

5. Flexible design, the shape of the soft pack lithium-ion battery can be customized according to customer needs, and new battery cell models can be developed.