Soft-pack Battery

Manufacturing Method of Vacuum-filled Seal for Soft-pack Battery

Soft pack battery is another name for lithium-ion battery. Compared with lead-acid battery, it has many advantages. They are small size, light weight, high specific energy, high safety, flexible design and so on.

In the production process of the soft pack battery, before injecting the electrolyte, the main body of the soft pack battery needs to be dried. Because the separator in the main body of the soft pack battery is not resistant to high temperature.

Its drying temperature is not suitable to be too high. As we all know, under normal pressure, the evaporation temperature of water is above 100 ° C. And the separator in the main body of the soft battery is easily deteriorated above 90 ° C.  The battery performance will decrease, the capacity will decrease, and the defective rate will increase.

Reduced economic benefits.

Therefore, in the prior art, we need dry the main body of the soft pack.  Batteries under vacuum conditions, which can reduce the drying temperature. They avoid damage to the main body of the soft pack battery under high temperature conditions. And they reduce the defective rate.

In the prior art, when injecting the electrolyte into the dried flexible battery body (i.e., the battery cell). It is performed in a positive pressure and dry environment.

The process of Soft-pack Battery

The worker need to inject he trace moisture in the environment into the battery cell with the electrolyte. The excess moisture will reduce the performance of the battery. It will increase the rate of defective products. And it also  increases production costs. And it reduces economic benefits. And there is a need for improvement.

In order to overcome the above defects, we can provide an automatic production line for lithium batteries, an integrated production line. They include an oven, a cooling glove box, a liquid injection glove box. They also contain a buffer glove box, a squeeze (static) vacuum box, a sealed glove box and a discharge vacuum.

The workers connect the oven and the glove box to achieve continuous production.

After baking, the battery core is always kept in a water-free and oxygen-free glove box environment. The entire production line includes a cooling glove box. It has a fast cooling speed and low cost. It ensures the battery cells baked from filling to filling.

It operates the sealing process in a controlled anhydrous and oxygen-free environment. And  provides the most solid protection for the quality of the battery. It can realize the automatic production of batteries, greatly improve production efficiency. It can save human capital, and configure the MES manufacturing execution system to realize informatized production.

Customers do not need to build a drying room and purchase a rotary dehumidification system. It  saves investment costs and operating costs.

Effectively improve production efficiency, suitable for large-scale popularization and application.  In addition, the lithium battery automatic production line can realize full-automatic code scanning-injection-weighing-rehydration-sealing operation.  The super purification glove box can avoid moisture in the air.  As injecting the electrolyte into the cells, it guarantees the performance of the soft-pack battery.

And it reduce the defective rate,  the degree of automation is high, and it can improve the economic benefits.