Positive Electrode Tab Layer for Battery Overcharge Protection

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Solution Overview

Problem

Secondary batteries face issues with overcharging, which affect cycle performance and safety, necessitating effective overcharge protection mechanisms.

Innovation Solution

Incorporating an overcharge prevention layer on the positive electrode tab with an overcharge prevention additive that reacts at high voltages to prevent overcharging, while maintaining the performance of the positive electrode active layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If overcharge prevention additive is added to the positive electrode active layer, then overcharge protection is improved, but cycle performance deteriorates

Engineering Contradiction:

Improveovercharge protectionVSAvoidcycle performance

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent divides the positive electrode into two functional parts: the positive electrode active layer (for normal charge-discharge cycles) and the positive electrode tab with overcharge prevention layer (for overcharge protection). This segmentation allows each part to perform its specific function without interfering with the other, resolving the contradiction between overcharge protection and cycle performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The overcharge prevention additive is extracted from the positive electrode active layer and placed separately in the overcharge prevention layer on the positive electrode tab. This extraction ensures that the additive only activates during overcharge conditions and does not degrade the performance of the active layer during normal operation.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If overcharge prevention additive is added to the positive electrode, then overcharge protection is improved, but the performance of the positive electrode active layer deteriorates

Engineering Contradiction:

Improveovercharge protectionVSAvoidperformance of positive electrode active layer

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The overcharge prevention layer is applied locally on the positive electrode tab rather than throughout the entire positive electrode active layer. This localized application ensures that the overcharge prevention function is provided only where needed, without affecting the electrochemical performance of the active layer material.

Inventive Principle:

Principle #3Local quality

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

Enhances cycle performance and reduces the risk of overcharge runaway by providing timely overcharge protection without degrading the positive electrode active layer's performance.

Implementation Method 1

an increase in the potential of the positive electrode plate can induce a slow reaction of the overcharge prevention additive in the positive electrode tab connected thereto, thereby ensuring overcharge protection

Methodology Applied

Scientific EffectHigh voltage reaction:

Data Source

PatentUS20260024822A1Secondary battery and electric apparatus

Publication Date: 2026.01.22 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

This application relates to a secondary battery and an electric apparatus. The secondary battery includes a positive electrode plate and a positive electrode tab connected to the positive electrode plate, where the positive electrode tab includes a first current collector and an overcharge prevention layer, the overcharge prevention layer is disposed on a surface of the first current collector, and the overcharge prevention layer includes an overcharge prevention additive. The secondary battery can improve cycle performance while ensuring overcharge protection.