Battery Stack Partition Wall Layout for Higher Volumetric Efficiency
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Solution Overview
Problem
Existing power storage devices face challenges in improving volumetric efficiency, as described in Japanese National Patent Publication No. 2022-525014.
Innovation Solution
The power storage device incorporates a first and second power storage stack arrangement with partition walls having specific configurations, including upper and lower partition portions and a narrower connecting portion between external terminals, allowing for closer stacking and enhanced volumetric efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the partition wall has a uniform width throughout its height, then the structure is simple and easy to manufacture, but the volumetric efficiency is reduced due to larger space occupation
Solution Approach 1:
The partition wall is segmented into three distinct portions: an upper partition portion, a lower partition portion, and a connecting portion. Each portion has a different width in the second direction, with the connecting portion having a smaller width than the upper and lower portions. This segmentation allows the partition wall to occupy less space while still effectively separating the first and second power storage stacks, thereby improving volumetric efficiency without significantly complicating the manufacturing process.
2Volume of moving object
If the partition wall is positioned closer to the external terminals, then the volumetric efficiency is improved, but the risk of damage and short circuits due to vibration increases
Solution Approach 1:
The partition wall exhibits local quality variations through its three portions with different widths. The upper and lower partition portions have larger widths to provide adequate protection and spacing from the external terminals, reducing the risk of vibration-induced damage and short circuits. The connecting portion has a smaller width to minimize space occupation and improve volumetric efficiency. This localized variation in width allows the partition wall to simultaneously achieve both protection and space efficiency.
Data Source
AI summary
A power storage device includes: a first power storage stack including a plurality of power storage cells; a second power storage stack including a plurality of power storage cells; and a partition wall separating the first and second power storage stacks from each other. The power storage cells each include a cell main body and an external terminal. The partition wall includes: an upper partition portion located at a higher position than the external terminal; a lower partition portion located at a lower position than the external terminal; and a connecting portion located between a pair of the external terminals adjacent to each other in the second direction, and connecting the upper and lower partition portions to each other. A width of the connecting portion is smaller than a width of the upper partition portion and a width of the lower partition portion.