Secondary Battery Electrode with Grooved Conducting Layer

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Solution Overview

Problem

The existing electrode members in secondary batteries face issues with stress concentration and the risk of the conducting layer falling off during the rolling process due to the difference in elastic moduli between the insulating substrate and the conducting layer, affecting the performance and safety of the battery.

Innovation Solution

The electrode member incorporates a first conducting layer with a stripe-shape groove that extends in the height direction, reducing stress concentration and the risk of the conducting layer falling off by allowing stress release, and includes a protecting layer to enhance the structural integrity and current collection capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the insulating substrate is made from softer material with lower elastic modulus to improve extensibility, then the extensibility is improved, but the conducting layer may fall off from the insulating substrate due to stress concentration

Engineering Contradiction:

ImproveextensibilityVSAvoidconducting layer attachment

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The conducting layer is segmented into multiple strips separated by grooves, allowing each strip to independently accommodate stress during extension without causing delamination of the entire layer from the insulating substrate

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conducting layer has different structural properties in different regions: continuous in some areas for electrical conduction, and segmented in other areas for stress relief, optimizing both electrical performance and mechanical reliability

Inventive Principle:

Principle #3Local quality

2Quantity of substance

If the active material layer is rolled to become thinner to improve energy density, then the energy density is improved, but stress concentration increases causing the conducting layer to fall off

Engineering Contradiction:

Improveenergy densityVSAvoidstress concentration

Core Design Contradiction:

Quantity of substanceVSStress or pressure

Solution Approach 1:

The conducting layer is divided into multiple strips by grooves, creating stress relief zones that prevent stress concentration during the rolling process, allowing the active material layer to be rolled thinner without causing delamination

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The groove structure introduces a vertical dimension feature into the conducting layer, creating depth variations that serve as stress concentration relief zones during the rolling process

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11101493B2Secondary battery and electrode member thereof

Publication Date: 2021.08.24 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

The present disclosure provides a secondary battery and an electrode plate thereof. The electrode member comprises an insulating substrate, a first conducting layer and an active material layer; the first conducting layer is provided on a surface of the insulating substrate, the active material layer is provided at a side of the first conducting layer away from the insulating substrate; the first conducting layer is provided with a stripe-shape groove extending in a height direction, the stripe-shape groove is used for releasing stress of the first conducting layer. The secondary battery comprises an electrode assembly, the electrode assembly comprises the electrode member.