POWER ELECTRONICS HANDBOOK
The 40-year battery pack SOL JACOBS
TADIRAN BATTERIES
Not all primary batteries offer the low annual self-discharge rate needed for the lengthy lifespan of remote wireless devices consuming microamp-level currents. THE VAST MAJORITY OF remote wireless devices are powered by primary (non-rechargeable) batteries that range from consumer grade to industrial grade. Consumer-grade alkaline batteries deliver higher discharge rates of energy, resulting in a short operating life. Also available are consumer-grade lithium batteries that deliver medium-to-high discharge rates of energy with short-tomedium operating life, including iron disulfate (LiFeS2), and lithium manganese dioxide (LiMNO2) chemistries. Meanwhile, a growing number of industrial wireless sensors and devices are being designed to operate for decades without having to replace the battery. They typically require only a low rate of energy discharge and consume microamps of average current. Many of these devices sit in extreme environments and hard-to-access locations, often connected to the Industrial Internet of Things (IIoT).
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DESIGN WORLD — EE NETWORK
2 • 2020
Lithium-based batteries have high intrinsic negative potential, exceeding that of all other metals, with an operating current voltage (OCV) ranging from 2.7 to 3.6 V. Lithium batteries are also non-aqueous, with the absence of water enabling them to endure extreme temperatures without freezing. Among all commercially available available chemistries, bobbintype lithium thionyl chloride (LiSOCl2) cells are preferred for use in remote locations and extreme environments. Bobbin-type LiSOCl2 batteries feature the highest capacity and highest energy density of any lithium chemistry, along with an extremely low annual self-discharge rate (less than 1% per year), enabling certain devices to operate for up to 40 years. Bobbin-type LiSOCl2 chemistry also features the widest possible temperature range (-80 to 125°C), along with a glass-tometal hermetic seal that resists battery leakage. Common applications include AMR/AMI metering, M2M, SCADA, tank-level monitoring, asset tracking, and environmental sensors, to name a few. eeworldonline.com
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