Conductive Adhesive Capacitor Electrode Sheet Without Weld Defects

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Solution Overview

Problem

Poor welding results such as weld point perforation and excessive height of weld points in capacitor electrode sheets lead to reduced strength, conductivity, and safety risks, affecting the performance and safety of capacitors.

Innovation Solution

A capacitor electrode sheet with a conductive adhesive layer composited with the electrode active material layer, enhancing conductivity and mechanical properties, and eliminating the need for conventional welding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If welding is used to connect electrode sheets to capacitor shell, then structural stability is improved, but weld point perforation and excessive height occur reducing strength and conductivity

Engineering Contradiction:

Improvestructural stabilityVSAvoidwelding quality

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent replaces the mechanical welding process with an adhesive bonding system. The electrode sheet includes a conductive adhesive layer that bonds the electrode active material layer to the capacitor shell through adhesive forces rather than mechanical welding, eliminating weld point defects while maintaining structural stability and electrical conductivity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The electrode sheet is designed as a composite structure with multiple layers including a conductive adhesive layer, electrode active material layer, and protective layer. This composite structure combines the bonding properties of adhesives with the conductive properties of electrode materials, achieving both structural stability and reliable electrical connection without welding.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If welding is used to prevent relative displacement, then structural stability is improved, but excessive weld point height increases risk of piercing separator

Engineering Contradiction:

Improvestructural stabilityVSAvoidseparator piercing risk

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical welding process with an adhesive bonding system. The conductive adhesive layer provides sufficient bonding strength to prevent relative displacement between electrode sheets and capacitor shell without creating protruding weld points that could pierce the separator, thereby eliminating the harmful effect while maintaining structural stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If conventional welding process is used, then connection strength is achieved, but conductivity and cycling stability are reduced

Engineering Contradiction:

Improveconnection strengthVSAvoidconductivity and cycling stability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The electrode sheet is designed as a composite structure with a conductive adhesive layer that combines bonding and conducting functions. This composite design maintains strong connection between electrode sheets and capacitor shell while ensuring excellent electrical conductivity and cycling stability through the inherent properties of the conductive adhesive material.

Inventive Principle:

Principle #40Composite materials

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 electrode sheet improves energy density, cycling stability, and safety of capacitors, while simplifying the production process and enabling miniaturization.

Implementation Method 1

coating the conductive adhesive material on a surface of the electrode active material layer; and curing and rolling pressing to obtain the capacitor electrode sheet

Methodology Applied

Scientific EffectCuring:

Implementation Method 2

a conductive adhesive layer composited with the electrode active material layer... possesses good conductivity

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentEP4715852A1Capacitor electrode sheet and preparation method therefor, and capacitor using same

Publication Date: 2026.03.25 EVE ENERGY CO LTD

Figure 1~3

AI summary

The present application provides a capacitor electrode sheet, a preparation method therefor, and a capacitor using the same. The capacitor electrode sheet includes an electrode active material layer and a conductive adhesive layer composited with the electrode active material layer. The capacitor electrode sheet possesses good conductivity and mechanical properties, and can enhance the energy density and cycling stability of the capacitors using the same.