Cylindrical battery and electric device
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Solution Overview
Problem
The structure of the current collector plate in cylindrical batteries affects the infiltration of electrolyte, leading to difficulties in replenishing electrolyte and impacting charge and discharge performance and service life.
Innovation Solution
A cylindrical battery design with a current collector plate featuring a substrate and through holes, where the ratio of through hole projection area to substrate projection area is 4% to 16%, allowing electrolyte to infiltrate the electrode assembly effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a current collector plate is attached to the flattened surface of the electrode assembly, then the structural support and current collection are improved, but the infiltration of electrolyte into the electrode assembly is hindered
Solution Approach 1:
The current collector plate incorporates through holes penetrating its thickness, creating a porous structure that allows electrolyte to pass through while maintaining mechanical support and electrical conductivity functions
Solution Approach 2:
The current collector plate is divided into multiple regions with through holes distributed across its surface, segmenting the solid structure into conductive pathways and fluid passageways simultaneously
2Power
If the current collector plate has a large substrate area, then the current-carrying capacity is improved, but the electrolyte infiltration is reduced
Solution Approach 1:
Different regions of the current collector plate have different properties: areas with through holes facilitate electrolyte infiltration while areas with substrate maintain current collection, creating local functional zones within a single component
Solution Approach 2:
The substrate is designed with through holes that create controlled porosity, allowing electrolyte penetration while preserving sufficient solid material for electrical conductivity and structural integrity
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
Improves electrolyte infiltration, enhances charge and discharge performance, and extends the service life of the cylindrical battery.
Implementation Method 1
The plurality of through holes on the substrate can serve as channels for an electrolyte to infiltrate the electrode assembly
Data Source
AI summary
A cylindrical battery includes a housing, an electrode assembly, and a current collector plate. The electrode assembly and the current collector plate are accommodated in the housing, and the electrode assembly includes a flattened surface, the flattened surface being provided at an end of the electrode assembly. The current collector plate includes a substrate and a bending portion interconnected. The bending portion are configured to bend towards the substrate, and the substrate is connected to the flattened surface. The substrate includes an axial hole and a plurality of through holes spaced apart from each other and running through the substrate. Along a thickness direction of the substrate, a projection area of the substrate is S1, and a sum of projection areas of the plurality of the through holes is S2, where 4%≤S2/S1≤16%.