Energy Storage Device Recessed Current Collector Housing
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Solution Overview
Problem
In energy storage devices, a dead space is often generated around the connecting portion between the electrode assembly and the current collector, which reduces the occupying ratio of the electrode assembly within the container, hindering the device's capacity.
Innovation Solution
The energy storage device incorporates a recessed portion in the container to house the connecting portion of the current collector, with the electrode assembly featuring a tab portion that includes a bent portion, allowing the connecting portion to be efficiently housed and reducing dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collector is connected to the electrode assembly in a conventional configuration, then the electrical connection is established, but a dead space is generated in the container around the connecting portion
Solution Approach 1:
The connecting portion of the current collector is nested within a recessed portion formed in the container. This allows the connecting portion to be housed inside the container volume rather than occupying external space, thereby reducing dead space and increasing the occupying ratio of the electrode assembly while maintaining the electrical connection reliability
2Volume of moving object
If the connecting portion is housed in a recessed portion, then the dead space is reduced and occupying ratio is increased, but the container structure becomes more complex
Solution Approach 1:
The container is segmented into a main body and a recessed portion. This segmentation allows the recessed portion to be formed as a localized feature within the container structure, minimizing the overall structural complexity while achieving the space reduction goal
3Volume of moving object
If the tab portion has a bent portion, then the connecting portion can be efficiently housed in the recessed portion, but the manufacturing process becomes more complex
Solution Approach 1:
The tab portion is formed with a bent portion (curved shape) that allows it to be efficiently housed within the recessed portion. This curvature enables compact arrangement and reduces dead space, while the bending process is a standard metal forming operation that does not significantly complicate manufacturing
Data Source
AI summary
An energy storage device includes: an electrode assembly; a positive electrode current collector and a negative electrode current collector connected to the electrode assembly; and a container configured to house the electrode assembly and the positive electrode current collector and the negative electrode current collector, wherein the container has recessed portions, a connecting portion of the positive electrode current collector and a connecting portion of the negative electrode current collector respectively connected to the electrode assembly are housed in the recessed portions, respectively, the electrode assembly has a tab portion which includes a connecting portion connected to the positive electrode current collector and a tab portion which includes a connecting portion connected to the negative electrode current collector, and the tab portions have a bent portion respectively.