Saft High Temp Li-ion
Saft has launched the world's first Li-ion (lithium-ion) cell capable of operating at temperatures of up to +125°C from the current maximum of +65°C - an innovation that opens up exciting new possibilities for the design of MWD (Measurement While Drilling) tools. At the same time, Saft has also launched a new D-size primary lithium cell.
The launch of the new VL 25500-125 Li-ion cell and the new LSH 20-150 primary cell is a major development in the design of reliable, cost-effective power sources for electronic equipment operating under the high levels of shock, vibration and pressure and extreme temperatures experienced by MWD tools in the oil and gas exploration industry.
To complement its growing range of lithium cells for MWD tools, Saft operates a dedicated battery design, development, testing and volume production facility at its factory in Poitiers, France. Here, the lithium cells are integrated into bespoke, ruggedised cylindrical MWD battery systems, known as 'Staves'.
As well as ensuring that the lithium cells have reliable electrical connections, a key element in the stave design is to provide complete mechanical integrity, even under extreme temperatures, vibrations and pressures. This involves careful selection of the construction materials and specialised manufacturing techniques, such as the cross-ply tape wrapping process. The staves also incorporate electronic controls, such as diodes to protect primary cells or balancing circuits to manage rechargeable cells.
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