Lithium Battery Manufacture – Humidity Control
Lithium batteries are high energy, longer life batteries used in a wide range of applications, including portable electronics, torches and implanted medical devices. The demand for this type of battery has been growing significantly.
In the production of Lithium batteries, very specific humidity control is required. In fact, in order to create the extremely dry air that is essential during the manufacturing process, dew points as low as -600C dp needs to be achieved. This is the equivalent of less than 0.5% relative humidity (RH) at 250C and is required to ensure that the Lithium remains stable.
Some of the problem that we have come across in this industry include:
- The degradation of the Lithium material
- Minimising infiltration
- Coping with moisture from people and the process
- Improving existing installations.
The reason that it is necessary to maintain such a low humidity environment in the production of lithium batteries is that lithium reacts negatively with water (vapor), to produce lithium hydroxide, hydrogen, and heat. This exposure to moisture has a direct detrimental impact on the quality, performance, and shelf life of the batteries.
A specialist dry room is required for such a demanding application. The production requires very specialist construction techniques and careful design of infiltration and personnel loadings to ensure that the condition is maintained.
The use of dehum equipment in this case, including dehum desiccant dehumidifiers, is essential and works closely with associated cooling and heating systems, with close tolerance control assured by utilization of high volume flow rates and usually laminar flow across the room.
The dehum equipment itself is also re-designed to ensure maximum efficiency and minimise running costs. All plants utilised for these challenging conditions are bespoke for the particular application and would be designed in conjunction with specialist contractors and consultants.
With our knowledge and experience in this field, we have achieved and maintained dewpoints lower than -700C dewpoint beyond the capability of other suppliers and exceeded our clients’ expectations.