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Agilent Technologies AN 372-2 manual

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Table of contents for the manual

  • Page 1

    Agilent AN 372-2 Battery T esting Application Note An electronic load can be used to discharge batteries of various chemistries to determine actual capacity , capacity retention, and internal impedance.[...]

  • Page 2

    2 Increasing demand for por table DC po wer has risen from impro vements in batt ery and mot or design technol- ogy. More than ev er before, portable DC powered products have become available in man y diverse applications. Rechargeable batt eries appear in all types of products from anal ytical electronic equipment to pow er tools and t o ys. In so[...]

  • Page 3

    3 Sev en standard t est procedures 1 are used t o verify cer tain electrical char- acteristics of secondar y batt eries: 1. Rated capacity 2. Capacity retention 3. Effective internal resistance 4. Discharge rate effect on capacity at –20°C 5. Discharge rate effect on capacity at 23°C 6. Life cycle performance 7. Extended overcharge Other miscel[...]

  • Page 4

    4 Capacity varies with the rate of dis- charge as sho wn in Figure 3. Testing for how discharge rate af f ects capacity is discussed later in more detail. Generally , low er discharge rates o ver longer periods of time yield higher values of tot al capacity. It is im por- tant to realize that since discharge rate affects how the value of C is deter[...]

  • Page 5

    5 Effective Internal Impedance Batter y impedance is dependent on temperature, its st ate of charge, and the load frequency. The effectiv e internal im pedance is low er f or a full y charged batter y than it is f or a dis- charged one. Having a lo w inter nal resistance is v er y im por tant when the batter y must support a high current for a shor[...]

  • Page 6

    6 Miscellaneous T ests In addition to t he tests already men- tioned, there are also other miscella- neous tests per f ormed on nick el- cadmium batteries. These t ests usually invol ve high rate charge and/or discharge. High rate discharge and charge of nickel-cadmium batteries is possible with t oda y’s ne w and better designed cells having adv[...]

  • Page 7

    7 From the various tests described so far , w e can see some common requirements for test equipment. All the tests require a discharge cycle using a constant current. A const ant discharge cur rent cannot be att ained with a simple resist or because the batter y voltage changes as current is drawn from it. An active device is required, such as an e[...]

  • Page 8

    Agilent T echnologies Electronic Loads are ideally suited for batter y test applications. Their man y f eatures ma k e t he test system easy to config- ure and pro vide safe, reliable, and repeatable operation. The A gilent 6060A Electronic Load and 6050A Electronic Load mainframe hav e the required constant-current modes as well as constant-resist[...]