Battery Cell String Wrapping for Impact-Resistant Pack Assembly
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Solution Overview
Problem
Existing electricity storage devices with multiple cell strings face issues with impact resistance due to excessive movement within the housing, leading to potential damage at connection points.
Innovation Solution
The device incorporates wrapping members inclined relative to the coupling direction around each cell string, enhancing impact resistance and facilitating easy insertion into a rectangular parallelepiped case, while using adhesive faces with dissolvable adhesive agents for improved recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple cell strings are housed inside a case to improve volume energy density, then the volume energy density is improved, but the impact resistance deteriorates due to excessive movement of cell strings
Solution Approach 1:
The patent applies wrapping members in the form of flexible bands or sheets that wrap around each cell string. These wrapping members restrain the cell strings from excessive movement while maintaining flexibility, thus improving impact resistance without compromising the compact arrangement of multiple cell strings inside the case.
2Reliability
If wrapping members are wrapped around cell strings to improve impact resistance, then the impact resistance is improved, but the device complexity increases
Solution Approach 1:
The wrapping members are designed as simple flexible bands or sheets that can be easily wrapped around cell strings. This approach provides effective impact protection without introducing complex structural elements, maintaining manufacturing simplicity while improving reliability.
Data Source
AI summary
An electricity storage device (battery) includes a first cell string (cell string) and a second cell string (cell string). The first cell string and the second cell string each include a plurality of electricity storage cells that is arrayed in a coupling direction and connection parts that electrically connect the electricity storage cells to one another. The electricity storage device further includes wrapping members (members) that are inclined relative to the coupling direction at least at one part and that are wrapped around the electricity storage cells included in the first cell string and the electricity storage cells included in the second cell string.