Folded Multilayer Battery Cell Venting for Moisture Blocking

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Solution Overview

Problem

The challenge is to prevent moisture penetration into battery cells while effectively discharging generated gas, as increased gas generation due to higher energy density leads to venting issues and potential side reactions.

Innovation Solution

A battery cell design featuring a multilayer gas discharge unit with a folded structure, comprising a first layer adhered to the sealing portion and a second non-adhered layer forming a gas passage, along with a moisture absorption layer, to enhance gas discharge and moisture prevention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If energy density of the battery cell is increased, then battery performance is improved, but gas generation inside the battery cell increases leading to venting and moisture penetration

Engineering Contradiction:

Improveenergy densityVSAvoidmoisture penetration

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The sealing portion is divided into multiple functional layers: a base sealing layer and a gas discharge unit with moisture blocking layer. This segmentation allows each layer to perform its specific function - the base layer provides structural sealing while the gas discharge unit handles gas venting and moisture blocking, resolving the contradiction between maintaining seal integrity and allowing controlled gas discharge.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The gas discharge unit acts as an intermediary component between the battery interior and exterior environment. It provides a controlled interface that allows gas to escape while blocking moisture from entering, thus mediating between the need for gas discharge and moisture protection requirements.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-generated harmful factors

If a venting portion is added to discharge gas, then gas emission is improved, but moisture can penetrate through the venting portion causing performance deterioration

Engineering Contradiction:

Improvegas dischargeVSAvoidmoisture penetration

Core Design Contradiction:

Object-generated harmful factorsVSObject-affected harmful factors

Solution Approach 1:

The gas discharge unit is constructed as a composite structure with a moisture blocking layer (first layer) and a gas discharge layer (second layer). This composite material approach allows the unit to simultaneously provide moisture blocking functionality while maintaining gas discharge capability, resolving the contradiction between venting gas and preventing moisture ingress.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different regions of the sealing portion have different functional properties: the base sealing layer provides general sealing, while the gas discharge unit provides localized gas discharge and moisture blocking. This local differentiation of quality allows the system to handle both gas venting and moisture protection in specific areas where needed.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If the sealing portion is made more impermeable to prevent moisture, then moisture protection is improved, but gas discharge capability is reduced

Engineering Contradiction:

Improvemoisture blockingVSAvoidgas discharge

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The sealing portion is segmented into distinct functional units: the base sealing layer for moisture blocking and the gas discharge unit for gas venting. This segmentation allows the moisture blocking function to be enhanced without compromising gas discharge capability, as each segment performs its dedicated function independently.

Inventive Principle:

Principle #1Segmentation

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 design improves gas discharge efficiency and prevents moisture ingress, maintaining battery performance by ensuring effective gas emission and sealing.

Implementation Method 1

a gas discharge unit inserted into the sealing portion and fused together with the sealing portion

Methodology Applied

Scientific EffectGas discharge:

Implementation Method 2

incorporating a moisture absorption layer with getter materials to facilitate effective gas discharge and prevent moisture ingress

Methodology Applied

Scientific EffectMoisture absorption: Absorption (physical)

Implementation Method 3

the gas discharge unit is opened toward the inside of the battery case, and the first layer becomes an outer surface of the gas discharge unit so that the first layer and the sealing portion come into contact with each other

Methodology Applied

Scientific EffectFusion:

Data Source

PatentUS12609381B2Battery cell with folded multilayer gas discharge unit and battery module including the same

Publication Date: 2026.04.21 LG ENERGY SOLUTION LTD

AI summary

A battery cell includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery. A gas discharge unit can be inserted into the sealing portion and fused together with the sealing portion. The gas discharge unit includes a first layer and a second layer in a folded structure about a first border line. The gas discharge unit is open toward the inside of the battery case, and the first layer forms an outer surface of the gas discharge unit. The first layer and the sealing portion being in contact with each other.