Silver-Zinc Battery Charging Current Control
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Solution Overview
Problem
Conventional rechargeable battery charging systems for silver-zinc batteries suffer from capacity fade due to asymmetric cycling, leading to reduced service life and performance.
Innovation Solution
A method involving controlled charging currents to maintain specific voltage plateaus, with first and second charging currents applied until the battery reaches predetermined voltages, ensuring minimal deviation within set limits to mitigate polarization peaks and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional charging methods are used for silver-zinc batteries, then charging speed is maintained, but capacity fade occurs due to asymmetric cycling
Solution Approach 1:
The charging method dynamically adjusts the charging current based on the battery's voltage plateau detection. When a voltage plateau is detected, the charging current is reduced to a lower level to maintain that plateau, creating a dynamic charging profile that adapts to the battery's state rather than using a fixed asymmetric charging pattern. This dynamic adjustment prevents capacity fade while maintaining acceptable charging speed.
Solution Approach 2:
The invention changes the charging current parameter in response to detected voltage plateaus. By detecting when the battery voltage stabilizes at a plateau level and then adjusting the charging current accordingly (reducing it to maintain the plateau), the system modifies charging parameters to prevent capacity fade. This parameter change strategy resolves the contradiction by allowing flexible current adjustment rather than rigid asymmetric charging.
2Productivity
If charging current is increased to reduce charging time, then productivity improves, but polarization peaks increase causing capacity fade
Solution Approach 1:
The charging system incorporates feedback by continuously monitoring battery voltage to detect polarization peaks and voltage plateaus. When a polarization peak is detected (indicating excessive charging current), the system provides feedback to reduce the charging current. This feedback mechanism allows the system to maintain higher charging currents when safe and reduce them when polarization peaks occur, resolving the contradiction between charging speed and polarization control.
Solution Approach 2:
The system takes preliminary anti-action by detecting voltage plateaus before excessive polarization occurs. When a voltage plateau is detected, the charging current is proactively reduced to prevent the formation of harmful polarization peaks. This preventive approach allows the system to maintain faster charging overall while avoiding the harmful effects of excessive polarization.
3Power
If asymmetric cycling is used during usage, then device performance is maintained, but capacity fade accelerates reducing battery life
Solution Approach 1:
The charging method performs preliminary action by detecting voltage plateaus during charging and adjusting the charging profile accordingly. By maintaining voltage plateaus through current reduction, the system prepares the battery for more symmetric cycling behavior during subsequent discharge cycles. This preliminary conditioning during charging helps mitigate the harmful effects of asymmetric cycling during device operation, allowing both performance and longevity to be improved.
Data Source
AI summary
The present invention provides a novel method for charging silver-zinc rechargeable batteries and an apparatus for practicing the charging method. The recharging apparatus includes recharging management circuitry; and one or more of a silver-zinc cell, a host device or a charging base that includes the recharging management circuitry. The recharging management circuitry provides means for regulating recharging of the silver-zinc cell, diagnostics for evaluating battery function, and safety measures that prevent damage to the apparatus caused by charging batteries composed of materials that are not suited for the charging method (e.g., non-silver-zinc batteries).