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System to Safely Use High Voltage Cells in Hearing Aids while Maintaining Compatibility to Zn-Air Cells

IP.com Disclosure Number: IPCOM000208591D
Original Publication Date: 2011-Jul-13
Included in the Prior Art Database: 2011-Jul-13
Document File: 1 page(s) / 66K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

There are new cells for energy storage upcoming that exceed todays NiMH (Nickel-Metal Hydride) cells in energy density and cycle life. To employ such cells in hearing aids, it has to be made sure that the new cells, which typically are of much higher voltage, can not be inserted into older hearing aids that are designed for low voltages so that these hearing aids are protected. Furthermore, it has to be ensured that Zn-Air (Zn: Zinc) cells in the sizes available worldwide can be used in new hearing aids also so that the availability of energy is ensured in all situations.

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System to Safely Use High Voltage Cells in Hearing Aids while Maintaining Compatibility to Zn-Air Cells

Idea: Dr. Simon Hüttinger, DE-Erlangen

There are new cells for energy storage upcoming that exceed todays NiMH (Nickel-Metal Hydride) cells in energy density and cycle life. To employ such cells in hearing aids, it has to be made sure that the new cells, which typically are of much higher voltage, can not be inserted into older hearing aids that are designed for low voltages so that these hearing aids are protected. Furthermore, it has to be ensured that Zn-Air (Zn: Zinc) cells in the sizes available worldwide can be used in new hearing aids also so that the availability of energy is ensured in all situations.

The idea to solve the problem is to construct the new cells with the same diameter as the cells available today but slightly higher, e.g. 0.5mm. This prevents the new cells from being inserted into older hearing aids. To make novel hearing aids compatible with standard cells, the hearing aids are equipped with an additional adapter plate that is built up of a conductive metal piece with a thickness equal to the height difference between the standard cell and the new cell. With this adapter plate, a standard cell can apply electrical contact in a battery compartment designed for the new higher cells.

The adapter plate solves the problem ment...