Dynamic Battery Reserve Capacity Control for Medical Devices
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Solution Overview
Problem
Battery-powered medical devices, such as electronic stimulation systems, face inefficiencies in managing battery capacity, as existing methods reserve excess energy and fail to maintain a constant reserve capacity throughout a battery's life, leading to reduced operational capacity and potential device malfunction.
Innovation Solution
A battery control system that uses a processor and software to dynamically adjust and maintain a constant reserve capacity by monitoring parameters like output voltage, recharge cycles, and age, allowing for actions such as reducing therapy or switching to low-power mode when the reserve threshold is reached, ensuring sufficient power for device functionality and safe battery operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed voltage-level threshold is used to reserve battery capacity, then the device ensures minimum operational power at the end of battery life, but it reserves excess energy during normal operation reducing usable capacity
Solution Approach 1:
The patent implements a dynamic reserve capacity management system that adjusts the reserve threshold based on battery state of health (SOH). Instead of using a fixed voltage-level threshold, the system continuously monitors battery parameters (voltage, current, temperature, cycle count) to estimate SOH and dynamically calculates an appropriate reserve capacity threshold. This allows the system to optimize usable capacity during early battery life while ensuring sufficient reserve at end-of-life, directly resolving the contradiction between reliability and energy utilization.
Solution Approach 2:
The system changes the reserve capacity threshold parameter based on battery aging state. By monitoring battery degradation through parameters like cycle count, voltage characteristics, and impedance changes, the system adjusts the reserve threshold to match the current battery capacity. This dynamic parameter adjustment enables maximum usable capacity during healthy battery operation while maintaining adequate reserves as the battery ages, resolving the fixed-threshold inefficiency.
2Stability of the object's composition
If a fixed voltage-level threshold is used to reserve battery capacity, then the device maintains consistent reserve policy, but it reserves larger-than-required capacity when the device is new
Solution Approach 1:
The system transitions from a static fixed-voltage policy to a dynamic SOH-based policy. The reserve threshold is continuously adjusted based on real-time battery state assessment, including cycle count, voltage characteristics, and temperature history. This dynamic approach maintains policy stability in terms of ensuring adequate reserve while optimizing usable capacity at each stage of battery life, resolving the contradiction between policy consistency and energy efficiency.
Solution Approach 2:
The system implements feedback mechanisms that continuously monitor battery performance parameters and adjust the reserve threshold accordingly. By measuring actual battery capacity through discharge tests or impedance spectroscopy and comparing it to the initial capacity, the system calculates SOH and adjusts the reserve threshold to maintain an appropriate reserve margin. This feedback loop ensures the reserve policy adapts to battery aging while maintaining reliability, resolving the contradiction between stable policy and efficient energy use.
3Duration of action of moving object
If the battery capacity is completely depleted, then maximum operational time is achieved, but the device becomes nonfunctional and system settings may be lost
Solution Approach 1:
The system performs preliminary actions by proactively managing battery capacity before complete depletion occurs. It continuously estimates remaining capacity based on SOH and usage patterns, and takes preventive actions such as notifying the user, reducing power consumption, or initiating recharging procedures when the reserve threshold is approached. This preliminary management ensures the device maintains functionality and preserves system settings while maximizing operational time, resolving the contradiction between duration and reliability.
Solution Approach 2:
The system creates a protective cushion by maintaining a dynamic reserve capacity threshold based on battery SOH. This cushion prevents complete battery depletion by ensuring sufficient capacity remains to maintain device functionality and preserve settings. The cushion size is optimized based on battery health - larger when healthy, reduced appropriately as battery ages - thereby maximizing operational time without compromising reliability, resolving the contradiction between duration and functionality.
Data Source
AI summary
Techniques are disclosed which provide a substantially constant battery reserve capacity with respect to therapeutic medical devices. Accordingly, a battery control system may be operable to maintain a substantially constant reserve capacity throughout the life of the battery. The battery reserve capacity activation threshold may be set and continuously or periodically updated so that a battery's remaining capacity equals the predetermined reserve capacity when the measured parameter reaches the activation threshold, thereby allowing a maximum amount of a battery's total capacity to be employed for therapeutic use and reserve only that portion of that capacity determined to provide for a desired level and/or period of device function after reaching the reserve threshold.