The pure water requirement for lithium battery industrial use stipulates that the water conductivity should be above 0.1 µS/cm (with a resistivity of over 10 megaohms). With the continuous advancement of water treatment processes in the market, ultra-pure water equipment used in the lithium battery industry employs reverse osmosis membrane technology, achieving water quality of up to 18.2 MΩ·cm and a desalination rate of approximately 99%.

 

The two-stage reverse osmosis water treatment process typically involves the following steps:

 

Raw water (tap water or groundwater) → Raw water pressurization pump → Multimedia filter → Activated carbon filter → Water softener → Precise filter → First-stage reverse osmosis → pH adjustment → Intermediate water tank → Second-stage reverse osmosis (with positively charged reverse osmosis membrane surface) → Purified water tank → Pure water pump → Micron filter → Water usage point.

 

Ultra-pure water for the lithium battery industry can also be produced using EDI (Electrodeionization) technology. The water production process is as follows:

 

Raw water (tap water or groundwater) → Raw water pressurization pump → Multimedia filter → Activated carbon filter → Water softener → Precise filter → First-stage reverse osmosis machine → Intermediate water tank → Intermediate pump → EDI system → Micron filter → Water usage point.

 

The ultra-pure water produced by this equipment can be used in various fields, including ultra-pure water for battery production, ultra-pure water for battery grid plates, and ultra-pure water for solar cell production.

 

The equipment operates in fully automatic mode and uses Dow's reverse osmosis membranes, achieving a water recovery rate of over 65%. This equipment is both cost-effective and labor-saving.