Silver Zinc Battery Capacity Segmentation for Service Life Extension
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Solution Overview
Problem
Silver-zinc batteries offer higher energy density than lithium-ion batteries but have a short service life due to rapid capacity drop-off with charge/discharge cycles, making them unsuitable for long-term use in mobile devices like laptops.
Innovation Solution
Implementing a battery capacity manager that defines a reserve capacity in silver-zinc batteries, allowing temporary increases in capacity as needed without compromising long-term cycle life, mimicking the performance of lithium-ion batteries while leveraging the advantages of silver-zinc batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silver-zinc battery chemistry is used to increase energy density, then battery capacity is improved, but service life deteriorates due to rapid capacity drop-off with charge/discharge cycles
Solution Approach 1:
The patent segments the battery capacity into two distinct parts: a base capacity that is always available and a reserve capacity that can be temporarily accessed. This segmentation allows the battery management system to control how capacity is delivered to the device, enabling temporary boosts from the reserve portion without permanently depleting the base capacity, thereby extending service life while maintaining high energy density benefits
Solution Approach 2:
The patent implements dynamic capacity management where the available battery capacity is not fixed but can be temporarily increased by drawing from the reserve capacity portion. The battery management system dynamically adjusts the available capacity based on device needs, allowing temporary access to higher capacity levels without permanently committing the battery to a reduced base capacity, thus resolving the trade-off between initial capacity and service life
2Duration of action of stationary object
If initial battery capacity is set at a lower level to extend service life, then cycle life is improved, but initial energy density advantage is lost
Solution Approach 1:
The patent segments the total battery capacity into a base capacity portion and a reserve capacity portion. The base capacity is set at a level that ensures long service life, while the reserve capacity provides additional energy that can be temporarily accessed when needed. This segmentation allows the battery to maintain a lower base capacity (extending service life) while still offering high initial capacity availability through the reserve portion
Solution Approach 2:
The patent performs preliminary action by pre-allocating a portion of the total battery capacity as reserve capacity during manufacturing or initial setup. This reserve capacity is set aside in advance and can be temporarily accessed when the device requires additional energy, allowing the battery to start with an effective high capacity while the managed base capacity ensures long service life
Data Source
AI summary
The provision of a mode in silver zinc batteries where a user can access extra capacity as an emergency reserve for times when extra capacity is needed. While this temporarily increases capacity, it does not detrimentally affect cycle life over the longer term, and it permits a silver zinc battery to essentially mimic the long term capacity and cycle life characteristics of a lithium ion battery while still affording inherent advantages associated with silver zinc batteries. In a variant embodiment, this ability to temporarily increase capacity is optimally employed at the end of a battery life cycle in a controlled “roll-off” that accords additional cycles of battery service life. In another variant embodiment, the general capability to control capacity is employed to gradually decrease the available capacity of a battery over the life of the battery, to thereby extend the battery service life.