Wound Electrode Layout for Compact High-Voltage Energy Storage
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Solution Overview
Problem
Conventional electrical storage devices with multiple electrical storage functional units connected in series face complexity in structure, difficulty in manufacturing, increased component count, and size issues, particularly in high-voltage products.
Innovation Solution
A winding structure with a band-shaped intermediate electrode body and extending portions connected to external terminals, where electrode bodies are disposed in parallel and symmetrically around the intermediate electrode body, using separators to enhance insulation and reduce leakage, allowing easy manufacturing and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple cylindrical electrical storage functional units are arranged concentrically to achieve higher voltage, then voltage capability is improved, but structural complexity increases and manufacturing becomes difficult
Solution Approach 1:
The electrical storage device is segmented into multiple functional units (first and second electrical storage functional units) that are arranged in a specific spatial configuration. Each functional unit consists of electrode bodies and separators arranged in alternating layers, creating distinct storage regions that can be independently analyzed and manufactured while achieving higher overall voltage through series connection.
Solution Approach 2:
The patent transitions from conventional concentric radial arrangement to a planar layered arrangement where electrode bodies and separators are stacked in alternating layers. This dimensional change from radial to planar configuration simplifies the structural complexity while maintaining the series connection architecture for higher voltage capability.
2Power
If three or more electrode bodies including intermediate electrode are wound via same number of separators to achieve higher voltage, then voltage capability is improved, but the number of layers in winding structure increases causing size increase
Solution Approach 1:
The patent merges the intermediate electrode with the outer circumferential surfaces of the first and second electrode bodies, eliminating the need for separate intermediate electrode structures. This integration reduces the total number of discrete components and layers in the winding structure, thereby reducing device size while maintaining the series connection configuration for higher voltage.
Solution Approach 2:
The intermediate electrode serves multiple functions: it acts as an electrode for electrical storage and simultaneously provides structural support and separation between the first and second electrical storage functional units. This multi-functionality reduces the need for additional dedicated separator layers, compacting the overall device structure.
3Power
If multiple electrical storage functional units are connected in series to achieve higher voltage, then voltage capability is improved, but the number of components increases
Solution Approach 1:
The patent combines multiple electrode bodies and separators into an integrated winding structure where the intermediate electrode is merged with the outer circumferential surfaces of adjacent electrode bodies. This merging reduces the total component count while maintaining the series connection architecture necessary for higher voltage capability.
Solution Approach 2:
The winding structure employs a composite arrangement of conductive electrode bodies and insulating separators in alternating layers, creating a unified multi-functional structure. This composite architecture allows series connection of multiple functional units while reducing the number of discrete components through the integrated layered design.
Data Source
AI summary
Provided is an electrical storage device that is compact and can be manufactured easily, while allowing for use of higher voltages. In an electrical storage device, a winding structure comprises: a central electrode body in which a first extending part and a second extending part extending from either side of a central portion are wound around the central portion in the same direction; a first electrode body electrically connected to a first external terminal and extending toward an outer peripheral side from a vicinity of the central portion; a second electrode body electrically connected to a second external terminal and extending toward the outer peripheral side from a vicinity of the central portion; a first separator disposed between the central electrode body and the first electrode body; and a second separator disposed between the central electrode body and the second electrode body.