FAILURE MECHANISMS AND ACCELERATED LIFE TESTS FOR BATTERIES,
Abstract
This report consists of a general conceptual framework, including definitions of terms and methods of analysis, for accelerated life tests of batteries. In Part I, the principal methods suitable for analysis of accelerated test data are reviewed and classified as empirical, statistical, or physical. Strengths and weaknesses of each approach are indicated. The use of three approaches is recommended. Part II consists of specific definitions of the following terms for batteries: within-cycle quality, degradation of quality between cycles, stress factor, and failure. Quantitative measures are given for the temperature quality, voltage quality, and pressure quality of a battery within a charge or discharge cycle. The physical concepts which underlie these definitions are discussed in Part III in an attempt to provide a correlation between failure mechanisms and stress levels for accelerated life tests. Four stresses for an accelerated test are suggested to be temperature, voltage, gas pressure, and mechanical stress. Each stress is subject to control through the control of an appropriate strain or rate of strain, either externally or internally to the battery. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1968
- Accession Number
- AD0838775
Entities
People
- Earl W. Roeger Jr
- John Mccallum
- Ralph E. Thomas
Organizations
- Battelle Memorial Institute