Wound Battery Cell Insulating Layer for Secure Electrode Fixing

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Solution Overview

Problem

Conventional battery cell wound structures face issues with energy density loss and stability due to uncoated foil regions not participating in ion intercalation, and poor adhesion between the electrode assembly and the accommodating component, leading to potential movement and corrosion during use.

Innovation Solution

The battery cell incorporates an insulating layer directly on the negative electrode terminating section, which is adhesively fixed to the accommodating component, reducing energy density loss and enhancing stability by eliminating the need for additional adhesive layers and minimizing the thickness of the electrode assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an additional adhesive layer is added to fix the electrode assembly to the accommodating component, then the adhesion strength is improved, but the thickness of the electrode assembly increases and energy density is reduced

Engineering Contradiction:

Improveadhesion strengthVSAvoidthickness of electrode assembly

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The insulating layer is designed to serve dual functions: providing electrical insulation and providing adhesion to fix the electrode assembly to the accommodating component. This merging of functions eliminates the need for a separate adhesive layer, reducing overall thickness while maintaining both insulation and adhesion requirements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The insulating layer is engineered with multi-functionality, simultaneously performing insulation, adhesion, and structural support roles. By making the insulating layer adhesive, the patent eliminates redundant components and reduces the total thickness of the electrode assembly while ensuring reliable fixation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Stability of the object's composition

If the negative electrode terminating section is made thicker with additional coating, then the structural stability is improved, but the energy density loss increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidenergy density

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The adhesion function is merged into the insulating layer itself, eliminating the need for additional adhesive layers that would increase thickness. This reduces energy density loss while maintaining structural stability through the adhesive properties of the insulating layer.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent optimizes the thickness and adhesive properties of the insulating layer to achieve the minimum necessary thickness for both insulation and adhesion functions. By carefully controlling the parameters of the insulating layer, structural stability is maintained while minimizing thickness and energy density loss.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the insulating layer is made thicker to ensure sufficient adhesion, then the adhesion performance is improved, but the energy density of the battery cell is reduced

Engineering Contradiction:

Improveadhesion performanceVSAvoidenergy density

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent optimizes the thickness parameter of the insulating layer to achieve the minimum necessary value for sufficient adhesion performance. By carefully controlling the thickness within an optimal range, the patent ensures adequate adhesion while minimizing the volume occupied by non-active materials, thereby preserving energy density.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The insulating layer is designed as a composite material that combines insulation properties with adhesive properties. This composite structure allows the layer to provide both electrical insulation and strong adhesion simultaneously, eliminating the need for additional adhesive layers and maximizing energy density.

Inventive Principle:

Principle #40Composite 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 configuration improves the stability and energy density of the battery cell by ensuring the electrode assembly is securely fixed within the accommodating component, reducing the risk of movement and corrosion, and enhancing the overall performance and user experience of electronic devices.

Implementation Method 1

the insulating layer is adhesively fixed to the accommodating component

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS20250023110A1Battery cell and electric device

Publication Date: 2025.01.16 NINGDE AMPEREX TECHNOLOGY LTD

AI summary

A battery cell includes an electrode assembly, where the electrode assembly is configured as a wound structure; and an accommodating component, where an installation space for accommodating the electrode assembly is provided in the accommodating component; where the electrode assembly includes a positive electrode plate and a negative electrode plate. The negative electrode plate includes a negative electrode terminating section. The negative electrode terminating section is disposed at an outermost circle of the electrode assembly, an insulating layer is provided on an outer side surface of the negative electrode terminating section, and the insulating layer is adhesively fixed to the accommodating component.