Journal
JOURNAL OF POWER SOURCES
Volume 90, Issue 2, Pages 144-152Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0378-7753(00)00396-7
Keywords
Li-ion button cell; hearing aid cell; hearing aid; safety
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Rechargeable lithium-ion batteries were designed to meet the power requirements of hearing aid devices (HADs). The batteries were designed in a 312-button cell size, compatible with existing hearing aids. The batteries were tested to evaluate the design and the electrochemical performance, as they relate to a typical hearing aid application. The present report covers the pulse capabilities, cycle life and preliminary safety tests. The results are compared with other battery chemistries: secondary lithium-alloy and nickel-metal hydride batteries and primary Zn-air batteries. The cell AC impedance was stable over the frequency range between 1 and 50 kHz, ranging between 5 Omega at the higher frequency and 12 Omega at the lower extreme. Pulse tests were consistent with these values, as the cells were capable of providing a series of 100 mA pulses of 10-s duration. The safety tests suggest that the design is intrinsically safe with respect to the most common types of abuse conditions. (C) 2000 Elsevier Science S.A. All rights reserved.
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