Current Collector Mixture Layer for Battery OCV Stability

Solution Overview

Problem

The exposed portion of the current collector in non-aqueous electrolyte secondary batteries, lacking a mixture layer, is prone to deformation when the lead is bent, leading to poor battery performance and decreased open-circuit voltage (OCV).

Innovation Solution

A non-aqueous electrolyte secondary battery design where a mixture layer is formed on at least one surface of the current collector adjacent to the exposed portion, enhancing the rigidity and reducing deformation of the current collector.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the lead is bent to connect to the battery case, then the electrical connection is achieved, but the exposed portion of the current collector deforms due to low rigidity

Engineering Contradiction:

Improveelectrical connectionVSAvoidexposed portion deformation

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent applies local quality by forming a mixture layer only at specific end portions of the current collector where leads are bonded, rather than uniformly across the entire current collector. This localized mixture layer reinforcement provides rigidity exactly where the lead bending causes deformation, while maintaining the exposed portion design for electrical connection elsewhere.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining the current collector with a mixture layer at the end portions. This composite structure enhances the rigidity of the current collector at critical locations where leads are attached, preventing deformation during lead bending while maintaining the overall electrode structure.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If the exposed portion is formed over the full width of the current collector, then the lead bonding is simplified, but the rigidity is reduced and deformation increases

Engineering Contradiction:

Improvelead bondingVSAvoidcurrent collector rigidity

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent applies local quality by forming a mixture layer only at specific end portions of the current collector where leads are bonded, rather than uniformly across the entire current collector. This localized mixture layer reinforcement provides rigidity exactly where the lead bending causes deformation, while maintaining the exposed portion design for electrical connection elsewhere.

Inventive Principle:

Principle #3Local quality

3Strength

If the mixture layer is formed adjacent to the exposed portion, then the rigidity is enhanced and deformation is reduced, but the manufacturing complexity increases

Engineering Contradiction:

Improvecurrent collector rigidityVSAvoidmixture layer formation

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent applies local quality by forming a mixture layer only at specific end portions of the current collector where leads are bonded, rather than uniformly across the entire current collector. This localized mixture layer reinforcement provides rigidity exactly where the lead bending causes deformation, while maintaining the exposed portion design for electrical connection elsewhere.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11552374B2Electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

Publication Date: 2023.01.10 PANASONIC ENERGY CO LTD

AI summary

The present disclosure provides a non-aqueous electrolyte secondary battery having a stable open-circuit voltage. An electrode for a non-aqueous electrolyte secondary battery according to one embodiment includes a belt-like current collector, a mixture layer formed on each surface of the current collector, and a lead bonded to an exposed portion of the current collector where the surfaces of the current collector are exposed, the lead extending from one end of the current collector, the one end and another end constituting both ends of the current collector in the width direction. In an electrode for a non-aqueous electrolyte secondary battery according to one embodiment, a mixture layer is formed on at least one surface of a current collector in the width direction of the current collector and adjacent to an exposed portion on one end side.