Power Storage Cell Terminal Overlap Stabilization Against Peeling
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Solution Overview
Problem
The connection portions between current collector terminals in secondary batteries can peel off due to displacement caused by vibrations, leading to potential failure.
Innovation Solution
A power storage cell design featuring a pair of cell units connected by an intermediate member with arm portions that sandwich overlapping current collector terminals, ensuring the arm portions are 90% or more of the distance between facing surfaces, and a clamping mechanism to stabilize the units, preventing displacement and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current collector terminals are connected by overlapping portions, then electrical connection is achieved, but the connection portions may peel off due to vibrations
Solution Approach 1:
The intermediate member acts as a mediator between the two cell units, with its arm portions sandwiching the overlapping portions of current collector terminals from the stacking direction. This intermediary structure provides additional support and prevents peeling while maintaining electrical connection, directly resolving the contradiction between achieving connection and preventing peeling under vibration.
2Volume of moving object
If cell units are disposed side by side in orthogonal direction, then space utilization is improved, but displacement under vibration increases
Solution Approach 1:
The intermediate member positioned between adjacently disposed cell units provides stabilizing support during vibration. Its arm portions extending in the orthogonal direction and sandwiching the current collector terminals prevent excessive displacement while maintaining the space-efficient side-by-side configuration, thus resolving the contradiction between space utilization and positional stability.
3Reliability
If arm portions sandwich overlapping portions in stacking direction, then peeling is suppressed, but manufacturing complexity increases
Solution Approach 1:
The intermediate member is segmented into a pair of arm portions that can be positioned to sandwich the overlapping portions from the stacking direction. This segmentation allows the intermediate member to provide targeted support at the critical connection points without requiring a complex overall structure, thus achieving peel suppression with moderate manufacturing complexity.
Data Source
AI summary
A power storage cell includes a pair of cell units, an intermediate member, and a cell case. Each cell unit includes at least one electrode body, a laminated exterior body, and a current collector terminal. The pair of cell units are disposed side by side in an orthogonal direction. A current collector terminal of a first cell unit and a current collector terminal of a second cell unit include overlapping portions overlapping each other. The intermediate member is positioned so as to sandwich the overlapping portions in a stacking direction, and includes a pair of arm portions extending in the orthogonal direction. A length of each arm portion in the orthogonal direction is 90% or more of a distance between a facing surface in the first cell unit and a facing surface in the second cell unit.