Cylindrical Battery Cell Gel Core to Prevent Electrode Collapse
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Solution Overview
Problem
The central collapse of the electrode assembly in cylindrical battery cells poses a significant risk, reducing the service life of the battery cell due to structural weakness and deformation during charging and discharging.
Innovation Solution
A gel-state central column is formed by packing a gel material into the roll core cavity of the electrode assembly, which coagulates to provide structural support and act as an elastic cushion, reducing the risk of central collapse and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a roll core cavity is formed at the center of the electrode assembly by winding, then the electrode assembly structure is simplified and manufacturing is easier, but the structural strength at the center is reduced and collapse risk increases
Solution Approach 1:
A central column is introduced as an intermediary component to fill the roll core cavity and provide structural support to the electrode assembly, resolving the contradiction between simplified manufacturing (which creates the cavity) and structural strength (which requires support against collapse)
Solution Approach 2:
The central column changes the physical parameters of the roll core cavity by filling it with a material that provides mechanical support, transforming the cavity from a void that compromises strength into a supported structure that maintains both manufacturing simplicity and structural integrity
2Adaptability or versatility
If the electrode assembly is allowed to swell and squeeze during charging and discharging, then the battery cell operates normally, but the electrode assembly deforms and service life is reduced
Solution Approach 1:
The central column acts as a pre-positioned cushioning element that accommodates the swelling and squeezing of the electrode assembly during charging and discharging, providing beforehand protection against deformation that would otherwise reduce service life
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 gel-state central column enhances the deformation resistance of the electrode assembly, reduces the risk of central collapse, and extends the service life of the battery cell by adapting to the swelling and squeezing during charging and discharging.
Implementation Method 1
a gel-state central column packed in the roll core cavity and formed by coagulation
Data Source
AI summary
A battery cell, a battery, and an electrical device are described. The battery cell includes an electrode assembly. The electrode assembly is wound along a winding direction to form a jelly-roll structure containing a roll core cavity in a central region. The battery cell further includes a gel-state central column packed in the roll core cavity and formed by coagulation. The central roll core cavity formed by winding the electrode assembly is packed with the gel material that coagulates to form a gel-state central column. In this way, the central column can support the electrode assembly after coagulating in shape, thereby improving the deformation resistance of the electrode assembly, and reducing the risk of central collapse of the electrode assembly. In addition, when the electrode assembly is squeezed, the central column can serve as an elastic cushion to some extent.