Hearing Instrument Rechargeable Battery Management
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Solution Overview
Problem
Hearing instruments with rechargeable batteries face issues such as short service life, sensitivity to temperature, and incorrect end-of-life detection, particularly with Li-ion batteries, which require optimized management to ensure reliable operation and extended battery life.
Innovation Solution
A hearing instrument system with an accumulator system that includes an energy transfer interface and communication interface, allowing for constant voltage supply and state of charge information transfer, enabling continuous monitoring and adjustment of operating parameters to optimize battery performance and extend service life, even for sensitive Li-ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If Li-ion batteries are used in hearing instruments, then energy density and service life are improved, but sensitivity to temperature and charging conditions worsens
Solution Approach 1:
A control facility is introduced as an intermediary between the Li-ion battery and the hearing instrument system. This control facility monitors temperature, charge state, and charging current, and adjusts charging parameters accordingly to protect the battery from temperature-related damage while maximizing service life
Solution Approach 2:
The control facility implements feedback mechanisms by continuously monitoring battery temperature, charge state, and charging current. Based on this feedback, the system dynamically adjusts charging parameters to prevent overheating and optimize battery performance, resolving the temperature sensitivity issue
2Loss of time
If rechargeable batteries are used in hearing instruments, then frequent battery replacement is reduced, but incorrect end-of-life detection occurs
Solution Approach 1:
The patent replaces simple voltage-based end-of-life detection with an electrochemical model that uses multiple parameters including charge state, temperature, and charging current. This substitution of the detection mechanism enables accurate determination of battery age and remaining capacity, preventing both premature and delayed replacement
3Adaptability or versatility
If NiMH accumulators are used in hearing instruments, then voltage level compatibility is maintained, but service life and capacity are limited
Solution Approach 1:
The control facility dynamically adjusts charging parameters such as charge current, voltage limits, and charging cycles based on the specific battery type (NiMH or Li-ion). This parameter optimization enables Li-ion batteries to achieve extended service life while maintaining voltage compatibility with existing hearing instrument systems
Data Source
AI summary
A hearing instrument system with a rechargeable battery or accumulator is optimized for everyday use, in particular for EOL detection, and the performance and service life of the accumulator. A hearing instrument, an accumulator system, and a charging system each have an energy transfer interface and a communication interface. The energy transfer interface and communication interface on the accumulator side can establish an energy transfer link and/or communication link on the charge and hearing instrument side. The accumulator system provides energy to the hearing instrument and transmits state of charge information generated by an accumulator control facility to the hearing instrument by way of the respective communication link. The transmission of the state of charge information enables a reliable state of charge detection in the case of batteries, whose state of charge cannot be identified on their voltage, for instance Li-ion systems with closed-loop controlled voltage.