The power of hearing aids

In the field of hearing aid system design, the integration of interdisciplinary knowledge is crucial, encompassing key disciplines such as electrochemistry, electrical engineering, and audio engineering. This article will focus on the intersection of electrochemistry and electrical engineering, exploring how they work together to enhance the performance of hearing aids. As a core nonlinear component, the battery's performance is maximized by achieving a precise match with the electrical characteristics of the hearing aid—voltage, discharge rate, and internal resistance.

With continuous technological innovation, the "675" type button cell, with its outstanding performance, has become the preferred power source for most behind-the-ear hearing aids. When hearing aids require more power, people turn to the larger, but less specialized LR6 "penlight" batteries.

Although a higher voltage can theoretically improve circuit efficiency, the promotion of 3V lithium-based batteries in the market still faces some challenges. Lithium-based batteries are favored for their high energy density, but there are still some technical issues to be resolved. Looking to the future, the market may prefer low-voltage metal-air batteries that are both environmentally friendly and have a long service life. In particular, the recently introduced zinc-air battery system, with its environmental characteristics and potential, is expected to become the mainstream battery technology in the future, gradually replacing traditional mercury batteries and alkaline batteries.