Wound Battery Cell Termination Insulation for Adhesion and Energy Density
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Solution Overview
Problem
Conventional wound battery cell structures face issues with energy density loss and cost due to uncoated foil regions not participating in ion intercalation reactions, and poor adhesion between the electrode assembly and the accommodating component, leading to stability and corrosion problems.
Innovation Solution
The battery cell features an electrode assembly with a negative electrode terminating section having an insulating layer directly adhered to the accommodating component, reducing the need for additional adhesives and minimizing uncoated foil regions, while using a combination of polyolefin and polyurethane or polyamide adhesive layers for enhanced adhesion and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional adhesive layer is arranged between the electrode assembly and the accommodating component, then adhesion performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the insulating layer and adhesive layer into a single integrated insulating layer that possesses both insulation and adhesion properties. This eliminates the need for a separate adhesive layer, reducing structural complexity while maintaining both insulation and adhesion performance.
Solution Approach 2:
The insulating layer is designed to perform multiple functions simultaneously: electrical insulation and adhesion. By making the insulating layer adhesive, the patent achieves multi-functionality, allowing one component to replace what would traditionally require two separate components.
2Ease of manufacture
If uncoated foil regions are increased to simplify manufacturing, then ease of manufacture is improved, but energy density decreases due to loss of active substance
Solution Approach 1:
The patent applies different properties to different regions of the electrode assembly. The insulating layer is made adhesive only at the terminating section where it contacts the accommodating component, while maintaining insulation properties elsewhere. This localized functional differentiation allows manufacturing simplicity without sacrificing energy density.
3Reliability
If the insulating layer thickness is increased to improve insulation performance, then insulation capability is improved, but energy density decreases due to increased thickness direction loss
Solution Approach 1:
The patent optimizes the thickness parameter of the insulating layer to achieve the minimum required value that provides sufficient insulation performance. By precisely controlling the thickness parameter rather than using excessive thickness, the patent maintains insulation capability while maximizing energy density.
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 reducing thickness-related energy losses and preventing corrosion, while also simplifying the manufacturing process and enhancing the adhesion between the electrode assembly and the accommodating component.
Implementation Method 1
the insulating layer is adhesively fixed to the accommodating component
Implementation Method 2
an insulating layer is provided on an outer side surface of the negative electrode terminating section
Data Source
Figure 1~3
Figure 4
AI summary
Some embodiments of this application provide a battery cell and an electric device. The battery cell includes an electrode assembly (100), where the electrode assembly (100) is configured as a wound structure; and an accommodating component, where an installation space for accommodating the electrode assembly (100) is provided in the accommodating component; where the electrode assembly (100) includes a positive electrode plate (110) and a negative electrode plate (120). The negative electrode plate (120) includes a negative electrode terminating section (123). The negative electrode terminating section (123) is disposed at an outermost circle of the electrode assembly (100), an insulating layer (130) is provided on an outer side surface of the negative electrode terminating section (123), and the insulating layer (130) is adhesively fixed to the accommodating component.