Wound Secondary Battery Insulation Layout for High-Current Reliability
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Solution Overview
Problem
There is a need for improving the reliability and improving the performance of secondary batteries, particularly in terms of their structural integrity and reliability.
Innovation Solution
The secondary battery includes a novel design with a specific configuration of electrodes and current collectors, an electrolyte, and a novel structure that includes a positive electrode current collector, a negative electrode current collector, and an insulating member that allows electrolyte permeability, with a through hole and a specific configuration of the electrode wound body, positive and negative electrodes, and a separator, enhancing structural integrity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a tabless structure is employed in the secondary battery, then the internal resistance is reduced and charging/discharging with large current is enabled, but the structural integrity and reliability deteriorate
Solution Approach 1:
The patent applies local quality by providing insulating members at specific locations (first and second end regions of the side surface) rather than uniformly throughout. The insulating members are strategically placed where the electrode wound body contacts the outer package to prevent short circuits locally, while maintaining the tabless structure's high current capability in the central regions.
Solution Approach 2:
The insulating members act as intermediary elements between the electrode wound body and the outer package. These intermediaries prevent direct contact between conductive components and the package wall, eliminating the reliability issue without modifying the tabless structure itself, thus preserving the high power capability.
2Quantity of substance
If the electrode wound body is tightly wound to improve energy density, then the space utilization increases, but the electrolyte permeability and structural integrity deteriorate
Solution Approach 1:
The patent extracts the electrolyte supply function from the bulk wound structure by introducing a through hole that extends from the first end face to the second end face. This extracted pathway ensures electrolyte can reach all parts of the electrode wound body regardless of winding tightness, maintaining permeability while allowing dense packing for high energy density.
Solution Approach 2:
The through hole introduces a new dimensional pathway (axial direction from first end face to second end face) for electrolyte flow, complementing the radial diffusion through the wound layers. This multi-dimensional electrolyte distribution enables tight winding for high density while maintaining adequate permeability through the axial channel.
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 novel configuration of the secondary battery enhances the structural integrity and reliability of the secondary battery, enhancing the structural integrity and reliability of the secondary battery, providing a battery pack that includes a secondary battery, a processor, and an outer package body, with a novel configuration of the electrode wound body, positive and negative electrodes, and a separator, improving the structural integrity and reliability.
Implementation Method 1
The insulating member has electrolytic solution permeability. The insulating member allows the electrolytic solution to pass through the insulating member.
Data Source
AI summary
A secondary battery includes an electrode wound body, a positive electrode current collector plate, a negative electrode current collector plate, an electrolytic solution, and an insulating member. The electrode wound body includes a stacked body including a positive electrode, a negative electrode, and a separator and being wound along a longitudinal direction thereof. The positive and negative electrode current collector plates are opposed to each other with the electrode wound body interposed therebetween in a width direction orthogonal to the longitudinal direction. The insulating member has electrolytic solution permeability. The electrode wound body has first and second end faces respectively facing the positive and negative electrode current collector plates in the width direction, and a side surface coupling the first and second end faces to each other. The insulating member is provided in a first end region, of the side surface, that is adjacent to the first end face.