Secondary Battery Current Collector Axial Space Reduction
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Solution Overview
Problem
The existing design of secondary batteries occupies excessive space due to the placement of the current collector between the tab and the case, which negatively impacts the energy density of the battery.
Innovation Solution
The current collector is redesigned with an extending portion and a current collecting portion that intersect, allowing the current collecting portion to connect to the tab in a direction perpendicular to the axial direction of the case, thereby reducing the axial space occupied and enhancing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collector is disposed between the tab and the case with the connecting region extending along the axial direction, then the current collector can effectively connect the tab to the case, but the current collector occupies much space in the axial direction which reduces the energy density
Solution Approach 1:
The current collector is designed with an L-shaped configuration where the current collecting portion extends in a direction perpendicular to the axial direction (radial direction), while the extending portion connects to the cap assembly in the axial direction. This dimensional change allows the current collector to maintain its connecting function while significantly reducing the axial space occupied, thereby increasing the energy density of the secondary battery.
2Device complexity
If the current collector occupies more axial space, then the connection structure is simpler, but the energy density of the secondary battery decreases
Solution Approach 1:
The current collector is segmented into two distinct portions: an extending portion that connects to the cap assembly in the axial direction, and a current collecting portion that collects current from the tab in the radial direction. This segmentation allows each portion to be optimized for its specific function, reducing overall axial space occupation while maintaining connection simplicity and improving energy density.
Data Source
AI summary
The disclosure relates to a secondary battery and a battery module. The secondary battery comprises: a case comprising a receiving hole having an opening; a cap assembly connected with the case to close the opening; an electrode assembly disposed in the receiving hole, wherein the electrode assembly comprises two end surfaces opposite to each other in a first direction and tabs extending from respective end surfaces, and there are two or more electrode assemblies stacked in the axial direction; and a current collector comprising an extending portion and a current collecting portion connected to the tab, wherein the extending portion extends in the axial direction, the current collecting portion comprises a connecting end extending in a second direction perpendicular to both the axial direction and the first direction, and is connected to an end of the extending portion away from the cap assembly through the connecting end.