Applications: Lithium-ion Batteries

Lithium-ion battery research and production facilities

DST are the market leaders in the design and supply of climate control systems for ultra-low dew point applications. Air dewpoints as low as minus 120°Cdp can be achieved by utilising the Seibu Giken DLR Zeolite desiccant rotors.

The processes used for manufacturing Lithium batteries are very similar to those used in the production of Nickel Cadmium cells and Nickel Metal Hydride cells with some key differences associated with the higher reactivity of the chemicals used in the Lithium cells. The anodes and cathodes in Lithium cells are of similar form and are made by similar processes.

The electrolyte filling and sealing stage of cell manufacture must be carried out in a “dry room” since the electrolyte is highly reactive with moisture. Moisture will cause the electrolyte to decompose with the emission of toxic gases. Lithium Hexafluoride (LiPF6) for instance, one of the most commonly used electrolyte materials, when exposed to moisture results in an exothermic chemical reactivation and the formation of toxic hydrofluoric acid (HF), Lithium Hydroxide and Hydrogen Gas.

Crucially moisture sealed inside the battery can continue to react after the battery is completed significantly reducing its lifespan. Recent research demonstrates that the ambient moisture present in the manufacturing room can degrade the “memory” characteristic of lithium and the newer advanced polymer-based batteries.

The construction method and design philosophy of the climate control system and dry room are crucial to achieving and maintaining a stable low relative humidity. The dry room and climate control equipment should be designed to achieve:-

•ISO Class 6/7 with air change rates ranging from 60 to 240 AC/H with a uniform air flow

•As close to near vapour tight construction as practicable

•Supply air of less than -60°Cdp (0.006 g/kg) with return air of less than -45.0°Cdp (equivalent to less than 0.5% RH at 25.0°Cdb) in order to achieve optimal conditions

•Access to the space via ante room and airlock air showers

•Optimised fresh air introduction to space for workers and pressurisation

Contact us today to see how we can provide your business with humidity control solutions.