Multi-Core Button Battery Electrode Assembly for Lower Internal Resistance
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Solution Overview
Problem
Conventional button-type electrode assemblies in button batteries suffer from poor conduction, leading to increased internal resistance and unstable energy, which affects charging and discharging performance.
Innovation Solution
The button battery design includes a first winding core with electrode layers of opposite polarities connected via a tab and a current collector, allowing for increased contact area and reduced internal resistance. Additional winding cores with parallel connections further enhance this, simplifying assembly and ensuring reliable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional winding type electrode assembly is used, then the battery structure is simple, but the conduction is poor resulting in increased internal resistance
Solution Approach 1:
The electrode assembly is divided into multiple independent winding cores (first winding core, second winding core, etc.), each with its own electrode layers and diaphragms. These segmented cores are arranged in parallel within the sealing cavity, allowing each core to contribute independently to conduction while maintaining structural simplicity. This segmentation resolves the contradiction by improving conduction through multiple parallel pathways without requiring a fundamentally complex assembly structure.
Solution Approach 2:
The patent transitions from a single winding core design to a multi-core parallel arrangement, adding spatial dimensionality to the electrode assembly. By arranging multiple winding cores side-by-side in the sealing cavity rather than stacking them sequentially, the design increases contact area and conduction pathways in the radial direction, thereby improving conduction performance without significantly increasing axial height or overall structural complexity.
2Reliability
If the contact area is increased to reduce internal resistance, then charging and discharging performance improves, but the device complexity increases
Solution Approach 1:
Multiple winding cores are merged in parallel within a single sealing cavity, sharing common battery housing, battery cover, and electrolyte environment. The first tab connects multiple positive electrode layers to the battery cover, while the first current collector connects multiple negative electrode layers to the battery housing, creating integrated conduction pathways. This merging approach increases contact area and improves charging/discharging performance while avoiding the complexity of multiple separate battery units.
3Productivity
If multiple winding cores are used to reduce internal resistance, then fast charging capability improves, but the sealing structure may be compromised
Solution Approach 1:
Each winding core is equipped with its own diaphragm (first diaphragm, second diaphragm, etc.) that provides localized separation and sealing between adjacent electrode layers within that core. The diaphragms are positioned at specific locations around the winding cores, providing targeted sealing quality where needed most. This localized approach ensures sealing integrity is maintained even with multiple cores, while allowing the overall structure to support fast charging through increased conduction area.
Data Source
AI summary
A button battery, comprising a pole assembly unit which comprises a first winding core, a first tab, and a first current collector; the first winding core comprises a first electrode layer, a second electrode layer, and a first separator sandwiched between the adjacent first electrode layer and second electrode layer, the polarities of the first electrode layer and second electrode layer being opposite to each other. The button battery also comprises a battery housing, a battery cover, and an insulating sealing ring; the battery housing forms a sealed cavity with the battery cover by means of the sealing ring; an electrolyte is stored within the sealed cavity; the pole assembly unit is disposed within the sealed cavity; and the first electrode layer is electrically connected to the battery cover by the first tab, and the second electrode layer is electrically connected to the battery housing by the first current collector.