Insulating Base Electrode Member with Through-Holes for Nail Penetration Safety

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Solution Overview

Problem

Lithium-ion battery electrode members made of aluminum or copper foils are prone to burr formation during nail penetration tests, leading to potential short-circuits, fires, or explosions, and the insulating base in new electrode members with conductive layers on an insulating base results in poor conductivity and welding difficulties.

Innovation Solution

An electrode member with an insulating base and a conductive layer having a first portion coated with active material and a second uncoated portion, where the insulating base has through-holes to enhance conductivity and facilitate welding by forming current paths and allowing easier penetration of welding energy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If aluminum foil or copper foil is used as electrode member, then good conductivity is achieved, but burr formation occurs during nail penetration test causing short-circuit risk

Engineering Contradiction:

Improvesafety in nail penetration testVSAvoidburr formation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the harmful metal foil material (aluminum or copper) from the electrode member structure and replaces it with an insulating base material, eliminating the burr formation problem during nail penetration tests while maintaining electrical functionality through alternative means

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent creates a composite structure combining insulating base material with conductive layers, forming a new type of electrode member that integrates both insulation properties (to prevent burr-related short circuits) and conductivity (to maintain battery function)

Inventive Principle:

Principle #40Composite materials

2Reliability

If insulating base is used in electrode member, then safety is improved, but welding difficulty increases

Engineering Contradiction:

Improvesafety in nail penetration testVSAvoidwelding process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the traditional welding process with a chemical bonding process using conductive adhesive, eliminating the need for welding equipment and simplifying the manufacturing process while maintaining connection integrity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS10804526B2Electrode member, electrode assembly and rechargeable battery

Publication Date: 2020.10.13 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

The present invention relates to the technical field of rechargeable batteries and, in particular, to an electrode member, an electrode assembly and a rechargeable battery. The electrode member of the present invention includes an electrode body. The electrode body includes an insulating base and a conductive layer disposed on a surface of the insulating base. The conductive layer has a first portion and a second portion extending from the first portion, the first portion is adapted to be coated with an active material and the second portion is uncoated with the active material. A portion of the insulating base corresponding to the second portion is provided with a first through-hole throughout a thickness direction.