Abstract
“The Hearing Aid Compatibility Act of 1988 (HAC Act) generally requires that the Federal Communications Commission (FCC) ensure that telephones manufactured or imported for use in the United States after August 1989, and all ‘essential’ telephones, are hearing aid-compatible”. The electromagnetic field (EMF) emission is generated by electrical currents in the phones’ circuit boards and components, including the battery. Here, we have investigated design changes to reduce the EMF from Lithium Ion (Li-ion) batteries. Changes mainly include: (1) Li-ion cell internal positive/negative tab location and length on cathode/anode layers; and (2) Li-ion cell external positive/negative connectors spacing. Results show that the cell’s internal tab locations and spacing between the cell’s external connectors play critical roles in reduction of battery EMF emissions. It is important that cells’ design changes are compatible with the manufacturing processes.
Highlights
The Hearing Aid Compatibility Act of 1988 (HAC Act) generally requires the FederalCommunications Commission (FCC) to ensure mobile phone service providers achieve compliance with the new hearing aid requirements (ANSI-C63.19-2011) [1]
The T-hearing aidiscompatibility (HAC) probe (R100), frequency analyzer, electronics load and scanner were used for data collection in X, Y and/or Z direction while the probe coil center was electronics load and scanner were used for data collection in X, Y and/or Z direction while the probe positioned mm above the sample top surface
Today’s smart phones, due to their high functionality, are tightly packed with control electronics and the battery occupies about 25% of the phone total volume
Summary
The Hearing Aid Compatibility Act of 1988 (HAC Act) generally requires the Federal. Communications Commission (FCC) to ensure mobile phone service providers achieve compliance with the new hearing aid requirements (ANSI-C63.19-2011) [1]. Per the HAC Act, mobile phone service providers (carriers) and manufacturers must ensure that a defined percentage of their product portfolio meets the requirements for “T-HAC” compatibility. Li-ions to shuttle between anode andhigh cathode duringpulse charging and that ionic increase with increasing current, in particular under current applications Electrical currents in such cell/battery assemblies generate electromagnetic field (EMF). Cell design parameters, in particular, cathode (+) and anode (−) tab locations structures the cell andthe battery, EMF can be substantially “cancelled”, interference in thewithin jelly-roll or in cut-stacked electrode layers. Studies were first based on bare copper (Cu) foils for T-HAC friendly batteries by changing the cell’s internal tab locations and lengths on cathode and simulating cathode and anode layers to form a “model jelly-roll.”. “magnetic noise (MN)” because of its undesirable impact on audio quality of the phone speaker and/or hearing aids
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