Meaning
Non-rechargeable power sources utilize lithium chemistry to achieve high energy density and long shelf lives in industrial applications. A primary lithium cell is designed to provide stable voltage throughout its life, making it suitable for devices that must operate unattended for years. These cells are widely used in remote sensors, smart meters, and tracking devices.
Electrochemical Composition
Internal components feature a lithium anode and various cathode materials, such as manganese dioxide or thionyl chloride. These materials allow the primary lithium cell to maintain a low self-discharge rate of less than two percent per year. This chemistry ensures that the stored energy remains available even after years of inactivity.
Discharge Profile
Output voltage remains remarkably flat across most of the service life of the battery. However, the primary lithium cell can experience transient voltage drops under high pulse currents, a phenomenon known as passivation. Designers use parallel supercapacitors to mitigate this drop during radio transmissions.
Application Integration
Selection of this power source requires careful calculation of the total lifetime energy budget of the product. The primary lithium cell must be matched to the sleep and active current profiles of the hardware to avoid premature failure. In outdoor environments, temperature fluctuations can affect the available capacity, demanding that the operating temperature range of the cell matches the environment of the installation.
