High power lithium ion batteries for a changing telecommunications world

In the wireline networks, 8-hour backup times are the norm and there is no need for a high-rate, short-duration discharge capability. However, times are changing, and with the advent of broadband and wireless communications, a case can be made for batteries with such a high-power capability. An examination of these two examples establishes the case for high-power batteries in telecommunications. Since many of these batteries will be installed in small outdoor enclosures with poor environmental control, these batteries will need to be light, compact and able to operate well at temperature extremes. They should also have a life expectancy that is compatible with the equipment that they are powering. High-power lithium ion batteries meet these needs. Developed in conjunction with the US Partnership for a New Generation of Vehicles (PNGV), a partnership of government and industry, the initial purpose of these batteries was to provide peak power for hybrid vehicles. However, the operating characteristics are also well suited for stationary applications such as telecommunications power. This paper evaluates the need for high power batteries and shows how lithium ion can meet this need more effectively than other types. It also describes the development of high-power lithium ion designs and provides details of their operating characteristics in the telecommunications environment.