Alkaline Battery Protective Layer Anode Migration

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Solution Overview

Problem

Batteries face failure due to migration of anode material, leading to reduced conductivity and internal shorting, which is exacerbated by jarring forces during handling or storage.

Innovation Solution

An alkaline battery design featuring a housing with a cathode, anode, and separator, where the anode is deposited within a cathode cavity, and a protective layer is applied on the cathode's top surface, along with a gel plug containing electrolyte and a gellant, which minimizes anode material migration and maintains conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the battery is subjected to jarring forces during handling or storage, then the anode material migrates, but this migration causes reduced conductivity and internal shorting

Engineering Contradiction:

Improvebattery performance stabilityVSAvoidanode material position stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies a protective coating to the cathode surface before the anode material can migrate and cause damage. This preliminary protective measure prevents the harmful effects of anode migration when jarring forces are applied during handling or storage, maintaining both conductivity and preventing internal shorting.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The protective coating acts as an intermediary layer between the cathode and the migrating anode material. This intermediate layer prevents direct contact between the anode particles and cathode, thereby preventing internal shorting while allowing the battery to withstand jarring forces.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the anode material migrates due to jarring forces, then internal shorting occurs, but this reduces the battery's electrical conductivity

Engineering Contradiction:

Improvebattery operational reliabilityVSAvoidinternal shorting

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The protective coating serves as an intermediary barrier that prevents migrating anode material from making direct contact with the cathode. This intermediary layer eliminates the harmful effect of internal shorting while maintaining the battery's electrical conductivity and operational reliability under jarring conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potentially harmful migration of anode material into a benign process by providing a protective layer that allows the anode material to move without causing internal shorting or conductivity loss. The harmful migration is transformed into a controlled process that does not compromise battery performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS8168321B2Alkaline battery having a protective layer

Publication Date: 2012.05.01 DURACELL US OPERATIONS INC

AI summary

An alkaline battery can include a housing, a cathode within the housing, an anode, a separator between the anode and the cathode, and an alkaline electrolyte contacting the anode and the cathode. The cathode defines an anode cavity and the anode is deposited within the anode cavity. The cathode has a top surface adjacent to the anode cavity. The battery can include a protective layer deposited on the top surface of the cathode and/or a gel plug deposited over the anode. The protective layer can include a PVA layer coated over the top surface of the cathode.