THE THERMAL PROPERTIES AND BEHAVIOR OF NICKEL-CADMIUM AND SILVER-ZINC CELLS AND THEIR COMPONENTS.
Abstract
The literature and data concerning the thermal properties of nickel-cadmium and silver-zinc cells was collected and summarized. Methods of optimizing the thermal properties and dimensions of such cells and batteries are given. Formulae are derived to describe the heat balance of two types of thermal models, one a homogeneous (thermally isotropic), system; the other a thermally anisotropic system which resembles more closely the actual cells in question. The importance, under certain conditions, of heat losses through the lead wires is stressed. Such losses may be large enough to help assure that temperature rise during discharge is reasonable. A thermal resistance-capacitance network analog model is also given which reveals that high thermal resistance (low ability to dissipate the heat generated) is largely associated with the gas gaps inside the cells, and the poor thermal conductivity of the cell case material. Examples are given of how this high thermal resistance may be reduced to improve operational performance. The concept of a thermal time constant is introduced as a measure of the rate of change of internal cell temperatures, and the ability to dissipate the heat generated.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1968
- Accession Number
- AD0834300
Entities
People
- Eric. W. Brooman
- John Mccallum
Organizations
- Battelle Memorial Institute