Maximize the Energy from Long-Life Batteries

　　電池壽命是無線傳感器節點，將填充物聯網產業發展的一個主要考慮因素（IIoT）。在許多應用中，傳感器節點將需要安裝在很難達到的位置，更遑論服務。傳感器節點需要在能源方面的自主性，因為它是太昂貴和難以運行電力線，他們或有維修工人定期更換電池。

　　除了處理電子產品的低功耗外，電池本身還需要支持非常長的服務時間：可能長達20年。許多電池化學不能支持這樣一個長期的使用壽命，即使當支持專門的低能量電子，因為它們的自放電率。

　　Lithium thionyl chloride chemistry， however， has a very low self-discharge rate. As a result， the chemistry provides the longest life and highest energy autonomy seen so far for primary battery technology that is suitable for IoT sensor nodes and other equipment where small size is important. The service life of the lithium thionyl chloride chemistry has been demonstrated over a period of close to 40 years. AA-size cells have exhibited a service life of more than 20 years in utility meters.

　　However， as the applications for long-lifetime battery-powered systems widen， it is important to take into account the characteristics of the lithium thionyl chloride chemistry. The addition of wireless communications to sensor nodes as well as actuation functions – such as the ability to open and close gas or liquid valves – increases the peak current required from the battery.