Alkaline Battery Rechargeability via Dynamic Voltage Window Control
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Solution Overview
Problem
Primary alkaline batteries are not rechargeable due to safety concerns and have limited cycle life, leading to frequent replacements and environmental issues from improper disposal, while rechargeable alkaline batteries face limitations in cycle life and proprietary charger restrictions, preventing mainstream adoption.
Innovation Solution
A method to determine and maintain an optimal voltage operating window for alkaline batteries by measuring ohmic and non-ohmic impedance, allowing for safe recharging and extended cycle life by operating within a narrow voltage range, which can be adjusted dynamically based on battery and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If primary alkaline batteries are recharged, then cycle life is extended, but safety hazards (acid leaks, fires, explosions) increase
Solution Approach 1:
The patent implements dynamic monitoring and adjustment of voltage operating windows during charge-discharge cycles. The system continuously measures battery voltage and impedance, dynamically adjusting the operating parameters to maintain safety while enabling rechargeability. This dynamic control prevents the safety hazards associated with static, fixed voltage limits.
Solution Approach 2:
The patent employs feedback mechanisms by continuously monitoring battery voltage, current, and impedance during operation. Based on this feedback, the system adjusts the charge-discharge parameters in real-time to prevent unsafe conditions while maximizing cycle life. The feedback loop ensures safety constraints are maintained even as the battery ages through multiple cycles.
2Use of energy by moving object
If rechargeable alkaline batteries use high depth of discharge, then energy capacity is maximized, but irreversible changes to electrochemical components occur
Solution Approach 1:
The patent changes the operating parameters by implementing optimized voltage operating windows and current profiles during charge-discharge cycles. Instead of using high depth of discharge, the system maintains voltage within specific ranges (e.g., 1.0-1.6V per cell) and controls charge/discharge rates to prevent irreversible electrochemical changes while still providing usable energy capacity.
Solution Approach 2:
The patent applies partial action by using moderate depth of discharge rather than full discharge. The system intentionally limits the discharge depth to preserve battery health and extend cycle life, accepting that not all available energy is utilized in each cycle. This partial utilization prevents the electrochemical damage that would occur with high depth of discharge.
3Reliability
If proprietary chargers are used for rechargeable alkaline batteries, then cycleability is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a universal charging methodology that can be applied to various alkaline battery types without requiring proprietary chargers. The charge protocol uses standardized voltage and current parameters that work across different battery chemistries and manufacturers, eliminating the need for device-specific charging equipment while maintaining good cycleability.
Solution Approach 2:
The patent enables batteries to be charged using simple, readily available power sources without requiring complex proprietary charging equipment. The charging method is designed to work with basic voltage sources and simple current limiting, allowing users to charge batteries with common devices rather than specialized chargers, thereby reducing overall system complexity.
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 enables primary alkaline batteries to cycle hundreds of times, extending their life and making them rechargeable, while secondary batteries achieve maximum state of health, reducing waste and environmental impact.
Implementation Method 1
measuring ohmic impedance, R and non-ohmic impedance, β of the battery
Implementation Method 2
Alkaline batteries contain manganese dioxide, graphite, steel, and zinc
Data Source
AI summary
Methods of using specific operational charge and discharge parameters to extend the life of alkaline batteries are disclosed. The methods can be used with any commercial primary or secondary alkaline battery, as well as with newer alkaline battery designs, including batteries with flowing electrolyte. The methods include cycling batteries within a narrow operating voltage window, with minimum and maximum cut-off voltages that are set based on battery characteristics and environmental conditions. The narrow voltage window decreases available capacity but allows the batteries to be cycled for hundreds or thousands of times.