Alkaline Cell Separator and Electrolyte Resistance Optimization
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Solution Overview
Problem
Conventional alkaline electrochemical cells face challenges in providing sufficient power capability and long service life for contemporary electronic devices due to high impedance, necessitating an improvement in alkaline electrolyte and separator combinations.
Innovation Solution
An alkaline electrochemical cell design featuring an anode and cathode with electrochemically active materials, an aqueous hydroxide-based electrolyte, and a separator with specific area-specific resistance between 100 mOhm-cm2 and 220 mOhm-cm2, optimizing the combination for reduced impedance and enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional alkaline electrolyte and separator combinations are used, then battery structure is simple and manufacturing is easy, but battery impedance is high resulting in insufficient power capability and short service life
Solution Approach 1:
The patent applies parameter changes by optimizing the area-specific resistance of the separator to fall within the range of 100-220 mOhm-cm2 and controlling the hydroxide concentration in the electrolyte between 25-35% by weight. These specific parameter ranges were determined to achieve the optimal balance between reducing battery impedance and maintaining acceptable manufacturing complexity. The separator's resistance parameter and electrolyte concentration parameter are carefully controlled to maximize power capability while keeping the overall system manageable.
Solution Approach 2:
The patent employs composite materials by combining a specifically engineered separator with controlled area-specific resistance (100-220 mOhm-cm2) and an aqueous electrolyte containing hydroxide at 25-35% concentration. This composite electrolyte-separator system works synergistically to reduce overall battery impedance. The separator material properties are optimized to work in conjunction with the electrolyte composition, creating a composite system that delivers superior power capability compared to conventional single-component approaches.
2Duration of action of stationary object
If conventional alkaline electrolyte and separator combinations are used, then manufacturing process is simple, but service life is short due to high impedance
Solution Approach 1:
The patent extends service life through parameter changes by controlling the separator's area-specific resistance within 100-220 mOhm-cm2 and the electrolyte's hydroxide concentration at 25-35% by weight. These optimized parameters reduce internal battery impedance, allowing for more efficient electrochemical reactions and reduced stress on battery components during discharge. The lower impedance enables better heat management and sustained performance over extended periods, directly contributing to longer service life in applications like motorized toys, remote controls, and clocks.
Solution Approach 2:
The patent applies local quality by optimizing specific regions and components of the battery system. The separator is engineered with a specific area-specific resistance range (100-220 mOhm-cm2) that is locally optimized for ion transport between electrodes. The electrolyte composition (25-35% hydroxide by weight) is also locally optimized in the cathode and anode regions to ensure efficient ionic conduction. This localized optimization of component properties throughout the battery structure enables extended service life without requiring complete redesign of the entire manufacturing process.
3Productivity
If separator with optimized area-specific resistance (100-220 mOhm-cm2) and electrolyte with 25-35% hydroxide concentration are used, then battery impedance is reduced and power capability is increased, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges (separator area-specific resistance: 100-220 mOhm-cm2; electrolyte hydroxide concentration: 25-35% by weight) that provide an optimal balance between discharge performance and manufacturing feasibility. These ranges are wide enough to accommodate normal manufacturing variations while still delivering significant improvements in productivity and power capability. The specified ranges enable manufacturers to achieve consistent performance without requiring ultra-precise control, making the technology practically implementable.
4Power
If conventional electrolyte and separator are used, then battery design is simple, but overall battery impedance is high limiting performance in electronic devices
Solution Approach 1:
The patent improves overall battery performance by changing key parameters: separator area-specific resistance is optimized to 100-220 mOhm-cm2 and electrolyte hydroxide concentration to 25-35% by weight. These parameter changes reduce internal impedance and enhance power delivery capability, enabling the battery to effectively power contemporary electronic devices such as motorized toys, remote controls, audio devices, and clocks. The design maintains relative simplicity by working within conventional battery architectures while optimizing specific component parameters.
Solution Approach 2:
The patent employs a composite approach by combining a separator with optimized area-specific resistance (100-220 mOhm-cm2) and an aqueous electrolyte with controlled hydroxide concentration (25-35%). This composite system works synergistically to reduce overall battery impedance without requiring fundamental redesign of the battery structure. The composite electrolyte-separator combination delivers enhanced power capability and performance while maintaining manufacturing simplicity and design elegance.
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
The proposed design results in improved power capability and extended service life for alkaline batteries, as demonstrated by increased discharge performance in various testing scenarios, such as the ANSI/IEC Motorized Toys, Remote Controls, and Clock/Radio Tests.
Implementation Method 1
An electrolyte in contact with the anode and the cathode contains ions that flow through the separator between the electrodes to maintain charge balance throughout the battery during discharge
Implementation Method 2
The anode contains an active material that can be oxidized. The anode active material is capable of reducing the cathode active material
Implementation Method 3
The cathode contains or consumes an active material that can be reduced. The anode active material is capable of reducing the cathode active material
Data Source
AI summary
An alkaline electrochemical cell having an anode including electrochemically active anode material, a cathode including electrochemically active cathode material, a separator between the anode and the cathode, and an electrolyte. The electrolyte includes a hydroxide dissolved in water. The separator in combination with the electrolyte has an initial area-specific resistance between about 100 mOhm-cm2 and about 220 mOhm-cm2.