Micro-perforated adhesive electrode lead for pouch battery safety

Solution Overview

Problem

Pouch-shaped secondary batteries face safety risks due to potential explosions from gas generation and swelling, especially during overcharge or abnormal states, as existing protection circuits and current interrupt devices are inadequate in preventing short circuits and maintaining energy density.

Innovation Solution

A pouch-shaped secondary battery design featuring a micro-perforated electrode lead with adhesive properties that allows for a short circuit to occur between the electrode lead and the battery case when the battery swells, using a perforated line to partition the electrode lead into parts that adhere differently to the battery case units, ensuring safety without additional components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a protection circuit or current interrupt device is added to prevent short circuits during battery swelling, then safety is improved, but device complexity and energy density are worsened

Engineering Contradiction:

ImprovesafetyVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electrode lead itself performs the protection function through its own adhesive properties and micro-perforated structure. When the battery case swells, the adhesive bond breaks at the micro-perforations, causing the electrode lead to disconnect and stop current flow automatically, without requiring external protection circuits or current interrupt devices

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The protection function is merged with the electrode lead structure itself. The electrode lead is designed with adhesive properties and micro-perforations that enable it to serve both as an electrical conductor and as a safety mechanism that automatically disconnects when the battery case swells, combining multiple functions into a single component

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If a current interrupt device is added to prevent short circuits during battery swelling, then safety is improved, but energy density is worsened

Engineering Contradiction:

ImprovesafetyVSAvoidenergy density

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The electrode lead itself performs the protection function through its own adhesive properties and micro-perforated structure. When the battery case swells, the adhesive bond breaks at the micro-perforations, causing the electrode lead to disconnect and stop current flow automatically, without requiring external protection circuits or current interrupt devices

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The protection function is merged with the electrode lead structure itself. The electrode lead is designed with adhesive properties and micro-perforations that enable it to serve both as an electrical conductor and as a safety mechanism that automatically disconnects when the battery case swells, combining multiple functions into a single component

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the electrode lead is made adhesive to prevent short circuits, then safety is improved, but manufacturing precision is worsened

Engineering Contradiction:

ImprovesafetyVSAvoidmanufacturing precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The electrode lead has different properties at different locations: the surface has adhesive properties for bonding to the battery case, while the interior maintains electrical conductivity. The micro-perforations are strategically located to control where adhesive bonding occurs, allowing the adhesive property to be localized to specific regions rather than uniformly distributed

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The electrode lead incorporates a micro-perforated structure that creates controlled porous regions. These micro-perforations allow the adhesive to bond at specific locations while maintaining electrical conductivity through the non-perforated portions, using a porous structure to achieve spatially differentiated functionality

Inventive Principle:

Principle #31Porous 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

This design effectively prevents current flow during abnormal states and maintains energy density by allowing the electrode lead to short circuit and disconnect, thereby preventing explosions and ensuring safety without reducing the battery's energy storage capacity.

Implementation Method 1

a pouch-shaped secondary battery including a micro-perforated electrode lead having adhesive properties

Methodology Applied

Scientific EffectAdhesive: Adhesive

Data Source

PatentUS10535859B2Pouch-shaped secondary battery including micro-perforated electrode lead having adhesive properties

Publication Date: 2020.01.14 LG ENERGY SOLUTION LTD

AI summary

Disclosed herein is a pouch-shaped secondary battery including a micro-perforated electrode lead having adhesive properties that is capable of enabling a short circuit to occur in the pouch-shaped secondary battery using the adhesive properties of the micro-perforated electrode lead with respect to a pouch-shaped battery case in order to secure the safety of the pouch-shaped secondary battery when the pouch-shaped secondary battery swells due to gas generated in the pouch-shaped secondary battery while the pouch-shaped secondary battery is in an abnormal state or when the pouch-shaped secondary battery is overcharged. Current is prevented from flowing in the pouch-shaped secondary battery when the pouch-shaped secondary battery is overcharged or when the pouch-shaped secondary battery is in an abnormal state.