Wound Electrode Assembly With Timed Separator Viscosity Loss

Solution Overview

Problem

Lithium precipitation in batteries leads to reduced electrical performance and safety hazards due to dendrite formation, which affects the overall safety and efficiency of battery operations.

Innovation Solution

A wound electrode assembly with a separator attached to the electrode plate in the bent region, which loses viscosity within a preset time to prevent ion intercalation and reduce lithium precipitation, thereby enhancing battery safety and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separator is attached to the electrode plate in the bent region to prevent lithium precipitation, then battery safety is improved, but the separator may cause wrinkling of the electrode plate during subsequent reshaping processes due to viscosity

Engineering Contradiction:

Improvebattery safetyVSAvoidelectrode plate wrinkling

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The separator is attached to the electrode plate in advance during the winding process, before the reshaping process occurs. This preliminary attachment ensures that the separator is already in position to prevent lithium precipitation at the bent region, while the subsequent loss of viscosity during reshaping allows the electrode plate to be formed without wrinkling.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The separator exhibits dynamic viscosity characteristics where it maintains viscosity during the winding process to prevent ion intercalation, then loses viscosity within a preset time to allow electrode plate reshaping without wrinkling. This time-dependent viscosity change enables the separator to adapt to different process requirements.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the separator maintains viscosity to prevent ion intercalation through the separator, then lithium precipitation is avoided, but the electrode plate may wrinkle during subsequent reshaping processes

Engineering Contradiction:

Improveprevention of lithium precipitationVSAvoidelectrode plate wrinkling

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The separator is attached to the electrode plate in advance during the winding process, before the reshaping process occurs. This preliminary attachment ensures that the separator is already in position to prevent lithium precipitation at the bent region, while the subsequent loss of viscosity during reshaping allows the electrode plate to be formed without wrinkling.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The separator exhibits dynamic viscosity characteristics where it maintains viscosity during the winding process to prevent ion intercalation, then loses viscosity within a preset time to allow electrode plate reshaping without wrinkling. This time-dependent viscosity change enables the separator to adapt to different process requirements.

Inventive Principle:

Principle #15Dynamics

3Speed

If deintercalated ions from the positive electrode plate are allowed to move freely, then charge-discharge rate is improved, but lithium precipitation occurs in the negative electrode plate due to lack of vacancies

Engineering Contradiction:

Improvecharge-discharge rateVSAvoidlithium precipitation

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The separator is extracted or removed from the path of ion transport in the bent region, or its function is taken out by providing alternative ion pathways. This allows ions to bypass the separator restriction in the bent region, maintaining charge-discharge rate while preventing lithium precipitation by controlling ion distribution.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The separator acts as an intermediary that selectively controls ion transport. It allows ion movement in regions where vacancies are available while blocking or redirecting ions in the bent region where the positive electrode plate has greater area and generates more deintercalated ions than the negative electrode plate can accommodate.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution effectively prevents lithium precipitation and dendrite formation, improving battery safety and performance by maintaining the integrity of the electrode assembly and preventing short circuits.

Implementation Method 1

the separator losing viscosity between the separator and the electrode plate within a preset time

Methodology Applied

Scientific EffectViscosity loss:

Data Source

PatentUS20250023087A1Wound electrode assembly, battery cell, battery, power consuming device, and winding apparatus

Publication Date: 2025.01.16 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

A wound electrode assembly, a battery cell, a battery, a power consuming device, and a winding apparatus are disclosed. The wound electrode assembly includes: an electrode plate; and a separator attached to the electrode plate and located in a bent region of the electrode plate, the separator losing viscosity between the separator and the electrode plate within a preset time. With the solution described hereine performance of the battery can be improved.