Cylindrical Battery Cell Flat Collector Plate for Higher Capacity
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Solution Overview
Problem
The folded current collector plate in cylindrical batteries occupies a large space, leading to a decrease in battery capacity due to compression of the electrode core.
Innovation Solution
The current collector plate is redesigned into a flat plate shape, allowing for a larger electrode core dimension within the same battery cell size, with electrical connections optimized to reduce current flow path length and loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a folded current collector plate structure is used to draw current from the electrode core, then the current collection function is achieved, but the current collector plate occupies a large space causing compression of the electrode core and decrease in battery capacity
Solution Approach 1:
The current collector plate is transformed from a folded three-dimensional structure occupying vertical space into a flat two-dimensional plate structure. This dimensional change allows the current collector to be positioned at the end of the tab in the radial direction, eliminating the need for vertical folding and thereby freeing up internal battery volume for the electrode core, which directly increases battery capacity while maintaining current collection functionality through the flat plate's electrical connection to the tab and conductive pillar
2Volume of stationary object
If the current collector plate is made compact to increase battery capacity, then the space occupation is reduced, but the current flow path length may increase causing higher resistance and energy loss
Solution Approach 1:
The flat plate current collector is pre-positioned at the end of the tab closest to the conductive pillar, establishing an optimized current flow path from the electrode core through the tab to the current collector and then to the conductive pillar. This preliminary positioning ensures that the current flow path is minimized before battery assembly, reducing resistance and energy loss while allowing maximum space for the electrode core, thus simultaneously achieving compact volume and low energy loss
Data Source
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AI summary
A battery cell, a battery pack, and a power consuming device are provided. The battery cell includes a housing, an electrode core, a first current collector plate, and a conductive pillar. A first tab is arranged at an end of the electrode core in a first direction. The electrode core is arranged in the housing. The first current collector plate and the conductive pillar are arranged at an end of the first tab that is away from the electrode core. The first current collector plate is constructed into a flat plate shape. The first current collector plate is electrically connected to the conductive pillar and the first tab.