Battery Cell Pin Current Path for Lower Internal Resistance
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Solution Overview
Problem
Existing battery cells face challenges in reducing internal resistance and improving charging and discharging efficiency, particularly in devices requiring rapid charging.
Innovation Solution
The battery cell design includes a specific configuration of electrodes, a case, and a pin member that facilitates a unique current path, with non-coating regions of electrodes connected to collector plates and a pin member, and insulating members to reduce internal resistance and enhance charging and discharging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional battery cell structure is used, then manufacturing simplicity is maintained, but internal resistance is high and charging efficiency is low
Solution Approach 1:
The battery cell is divided into multiple independent components: electrode assembly, case, cap plate, terminal member, and pin member. Each component performs a specific function, allowing for optimized current paths and reduced internal resistance while maintaining manufacturing simplicity through modular assembly.
Solution Approach 2:
The pin member acts as an intermediary component connecting the electrode assembly to the terminal member. This intermediary structure provides a direct electrical connection path that reduces internal resistance and improves charging efficiency without significantly complicating the overall cell structure.
2Reliability
If internal resistance is reduced through structural modifications, then charging efficiency improves, but device complexity increases
Solution Approach 1:
The case serves multiple functions: it provides structural containment for the electrode assembly, acts as an electrical connection component, and serves as a mounting structure for the cap plate and terminal member. This multi-functionality reduces the need for additional components, maintaining simplicity while improving charging efficiency through optimized electrical connections.
Solution Approach 2:
The terminal member and cap plate are merged into a single integrated component that combines electrical connection functions with structural support. This merging reduces the number of separate components while maintaining low internal resistance through direct electrical pathways from the electrode assembly to the external terminals.
3Speed
If rapid charging capability is enhanced, then energy transfer speed increases, but heat generation increases
Solution Approach 1:
The electrical connection components (pin member, terminal member, case) are designed with high electrical conductivity in the current path regions to minimize resistive heating. The local quality of these components is optimized for rapid electron transport, allowing high charging speeds while controlling heat generation through reduced electrical resistance in critical areas.
Data Source
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AI summary
A battery cell according to the present disclosure may include: an electrode assembly including a first electrode, a second electrode and a separator; a case accommodating the electrode assembly and electrically connected to the first electrode; a cap plate connected to the case; a terminal member provided on the cap plate; and a pin member disposed on a core of the electrode assembly and electrically connected to the second electrode and the terminal member.