Laminated Battery Collector Slits for Delamination Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing batteries face issues with delamination due to air retention in laminated bodies, particularly in large-area or thin-layer configurations, leading to structural defects and reduced reliability.

Innovation Solution

Incorporating slits in the first collector that penetrate in the thickness direction and connect to the outer edge, facilitating air discharge from the central region to the outer edge during pressurization, thereby inhibiting delamination and enhancing structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a laminated battery is constructed with large-area or thin-layer electrodes, then the energy density and capacity are improved, but air remains trapped in the laminated body causing delamination and structural defects

Engineering Contradiction:

Improveenergy densityVSAvoidstructural integrity

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The collector is designed with slit-shaped pores extending from the inner region to the outer edge, creating a controlled porous structure that allows air to escape during lamination while maintaining the overall integrity and density of the electrode assembly

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The collector is segmented with multiple slits distributed across its surface, dividing the air escape function into multiple pathways that collectively resolve the air trapping problem across the entire large-area laminated structure

Inventive Principle:

Principle #1Segmentation

2Strength

If the collector is made solid without slits, then the structural strength is maintained, but air remains trapped causing delamination

Engineering Contradiction:

Improvecollector strengthVSAvoidair retention

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The collector incorporates slit-shaped pores that provide air escape pathways while maintaining sufficient structural strength through the remaining collector material and the anchoring effect of active material in the slits

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The slits, which initially appear to weaken the collector, actually convert the harmful air trapping effect into a beneficial air escape mechanism, allowing the collector to maintain both strength and air permeability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If slits are added to the collector to enable air discharge, then delamination is prevented, but the collector structure becomes more complex

Engineering Contradiction:

Improvedelamination resistanceVSAvoidcollector structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The collector is divided into multiple regions with slits distributed across the inner region, creating a segmented structure that provides multiple air escape pathways while maintaining overall structural simplicity and manufacturability

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12548780B2Battery and laminated battery

Publication Date: 2026.02.10 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A battery includes a first electrode, a second electrode, and a solid electrolyte layer located between the first electrode and the second electrode. The first electrode includes a first collector and a first active material layer located between the first collector and the solid electrolyte layer. The first collector has at least one first slit, the at least one first slit penetrating the first collector in a thickness direction and being connected to an outer edge of the first collector.