Battery Case Corrosion Measurement Without Plating Damage

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Solution Overview

Problem

Existing methods for evaluating the corrosion resistance of secondary battery cases are inaccurate due to damage or peeling of the plating layer, which disrupts the initial state of the case, making it difficult to accurately assess corrosion characteristics.

Innovation Solution

A characteristic measurement apparatus is developed with a sealing member, washers, an auxiliary electrode, and a reference electrode, allowing for non-destructive evaluation of the secondary battery case by maintaining the case's initial state and using electrolyte immersion to measure corrosion characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the case is dismantled, bent, or planarized for electrochemical evaluation, then the evaluation can be conducted, but the plating layer is damaged or peeled off, compromising measurement accuracy

Engineering Contradiction:

Improvecorrosion resistance measurement accuracyVSAvoidcase surface state integrity

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary action by installing the measurement electrode assembly into the case before the case is subjected to bending or planarization during battery assembly. This allows corrosion measurements to be taken on the case in its initial, undamaged state, before any plating layer damage occurs from subsequent handling.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a measurement electrode assembly as an intermediary device that enables corrosion measurement without requiring direct manipulation or damage to the case surface. The assembly includes electrodes that contact the electrolyte and case to measure corrosion electrochemically, eliminating the need for physical sampling or surface disruption.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the case is sampled for corrosion evaluation, then corrosion characteristics can be determined, but the initial state of the case is altered, introducing measurement errors

Engineering Contradiction:

Improvecorrosion characteristic accuracyVSAvoidcase material integrity

Core Design Contradiction:

Measurement precisionVSLoss of substance

Solution Approach 1:

The case serves itself in the measurement process by acting as one of the electrodes (working electrode) in the electrochemical cell. The case's own corrosion behavior is measured through electrochemical reactions between the case, electrolyte, and reference/counter electrodes, eliminating the need to remove or sample case material for separate analysis.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces mechanical sampling or physical inspection methods with electrochemical measurement. Instead of mechanically removing case material or visually inspecting the surface, the system uses electrochemical reactions to measure corrosion rates and characteristics, substituting a non-contact, non-destructive measurement approach.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If the case shape is changed for evaluation, then access for measurement is improved, but the corrosion characteristic measurement becomes inaccurate due to altered surface state

Engineering Contradiction:

Improvemeasurement accessibilityVSAvoidcorrosion resistance data accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The measurement electrode assembly is nested inside the case, with electrodes positioned within the internal volume of the case. The reference electrode and counter electrode are arranged around the working electrode (case interior surface), creating a compact electrochemical cell that fits within the case without requiring external modification or shape change.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 apparatus enables accurate and non-destructive measurement of corrosion characteristics, minimizing errors by maintaining the case's shape and structure, and providing precise data on corrosion resistance.

Implementation Method 1

a reference electrode insulated from the auxiliary electrode and configured to be positioned between the washers... the reference electrode and auxiliary electrode may be configured installed to be immersed in the electrolyte

Methodology Applied

Scientific EffectElectrochemical reaction: Redox Reactions

Data Source

PatentUS20250321199A1Characteristic measurement device for secondary battery case

Publication Date: 2025.10.16 SAMSUNG SDI CO LTD

AI summary

A characteristic measurement apparatus for a secondary battery case includes a sealing member configured to seal an entrance of a metal case for a secondary battery whose characteristics are to be measured; a pair of washers connected to the sealing member and configured to be installed facing each other in the case; an auxiliary electrode configured to be positioned between the washers; and a reference electrode insulated from the auxiliary electrode and configured to be positioned between the washers.