Battery Charging Termination Parameter Based on Previous Session Duration
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Solution Overview
Problem
Existing battery charging techniques fail to efficiently manage the increase in battery impedance as it approaches full charge, leading to potential voltage rises that can cause swelling, and do not adapt to changing battery conditions over time.
Innovation Solution
The method involves charging the battery during a top-off period by reducing the charging current based on the battery's state of charge and capacity, using a determined charging termination parameter that accounts for the duration and amount of charge from previous sessions, to maintain optimal voltage and ensure full charge without swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging current is reduced during top-off period, then battery voltage stability is improved, but charging time increases
Solution Approach 1:
The charging current is dynamically adjusted based on real-time battery impedance measurements. During the top-off period, when impedance increases, the system automatically reduces charging current to maintain voltage stability, while still completing the charging process efficiently
Solution Approach 2:
The system changes charging parameters (current level) based on battery state (impedance, state of charge). By monitoring battery impedance and state of charge, the system transitions from constant current charging to reduced current charging when appropriate, resolving the contradiction between charging speed and voltage stability
2Device complexity
If charging termination parameter is fixed, then charging process is simple, but battery conditions over time are not adapted
Solution Approach 1:
The system uses feedback from battery impedance measurements and state of charge monitoring to automatically adjust the charging termination parameter. This adaptive feedback mechanism allows the system to account for battery aging and changing conditions without requiring complex manual intervention
Solution Approach 2:
The charging system performs self-adjustment by monitoring its own battery conditions and automatically modifying charging parameters. The system serves itself by detecting battery aging through impedance changes and adapting the charging profile accordingly, eliminating the need for external recalibration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for safe and efficient full charging of batteries in implantable medical devices by managing impedance increases and adapting to changing battery conditions, ensuring reliable operation without voltage-related issues.
Implementation Method 1
Battery charging termination parameter based on previous charging session duration
Implementation Method 2
During charging, an impedance of the battery may increase as the battery reaches full charge. To avoid a corresponding rise in voltage
Data Source
AI summary
This disclosure describes techniques for a method of charging a battery. In an example, the method includes charging the battery during a first charging session until a first charging termination parameter value is reached. The method also includes determining, for a second charging session, a second charging termination parameter value based on a duration of the first charging session, wherein the second charging termination parameter value is different than the first charging termination parameter value. The method also includes charging the battery during the second charging session until the second charging termination parameter value is reached.