Power Storage Cell Tab Overlap and Tapered Insulating Plate Layout
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Solution Overview
Problem
The existing stacked battery design requires a large space for accommodating bundled current collector tabs, leading to inefficient use of storage space in the battery can.
Innovation Solution
The power storage cell design includes a plurality of current collector tabs arranged side by side and bent to overlap, with an insulating plate featuring a thickness adjusting portion that tapers inward, reducing the space needed for the tabs and minimizing positional deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current collector tabs are bundled together, then electrical connection is achieved, but storage space increases
Solution Approach 1:
Multiple current collector tabs are bundled together to form a single integrated structure that provides electrical connection while reducing the overall space required compared to having separate tabs
Solution Approach 2:
The current collector tabs are arranged in a nested configuration where they are bundled together, allowing them to occupy less space by being contained within a compact arrangement
2Reliability
If current collector tabs are arranged side by side, then electrical connection is improved, but positional deviation increases
Solution Approach 1:
An insulating plate with a thickness adjusting portion is introduced as an intermediary component between the current collector tabs and the battery can. This mediator controls the positioning of the tabs, reducing positional deviation while maintaining effective electrical connections
Solution Approach 2:
The insulating plate features a thickness adjusting portion with specific local thickness variations that provide precise positional control for the current collector tabs at critical locations, thereby reducing positional deviation
Data Source
AI summary
A power storage cell includes an electrode assembly, an insulating plate, and a cell case. The electrode assembly includes a plurality of electrodes and a separator. The electrodes include respective current collector foils and active material layers. The electrode assembly includes: an electrode assembly body where respective parts of the current collector foils provided with the active material layers are arranged side by side in one direction with the separator interposed therebetween; and a plurality of current collector tabs formed by respective parts of the current collector foils not provided with the active material layers. The current collector tabs are bent with a part of one current collector tab superposed on an adjacent current collector tab. The insulating plate includes a base portion and a thickness adjusting portion located on an end of the base portion in a second direction. The thickness adjusting portion tapers inward in the second direction.