Battery Stack Restraint Plate Layout for Impact Vibration Protection
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Solution Overview
Problem
Conventional power storage devices mounted on vehicles are prone to damage from impacts due to the transmission of vibrations, where the foaming filler can push the assembled battery, leading to potential breakage.
Innovation Solution
A power storage device configuration featuring a power storage stack sandwiched by restraint plates with reinforcing portions and stoppers positioned to overlap these reinforcing elements, preventing direct inward pushing of the battery during impacts and including a cooler and current collecting plates to prevent short circuits, with heat insulating members to manage condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foaming filler is disposed at a corner portion of the side surface to improve vibration resistance, then the vibration resistance is improved, but when an impact is transmitted to the storage case, the foaming filler pushed into the storage case may push the assembled battery causing damage
Solution Approach 1:
The restraining plate is introduced as an intermediary component between the storage case and the assembled battery. When impact occurs, the restraining plate absorbs and distributes the force through its rigid structure and reinforcing portions, preventing the foaming filler from directly pushing the assembled battery while maintaining vibration protection benefits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses breakage of the power storage stack by enhancing the rigidity of the restraint plates and positioning stoppers to prevent direct impact-induced deformation, while also preventing short circuits and condensation issues, thus ensuring the integrity and functionality of the device.
Implementation Method 1
the portions of the restraint plate that are provided with respective reinforcing portions have a higher rigidity and are less likely to deform when an impact is applied in the second direction
Implementation Method 2
when an impact is applied in the second direction, it is possible to prevent the stoppers disposed between the power storage stack and the corresponding side wall portion of the pair of side wall portions from directly pushing inward the power storage stack
Data Source
AI summary
A power storage device includes: a power storage stack including a plurality of power storage modules arranged in a first direction; a pair of restraint plates sandwiching the power storage stack in the first direction; a pair of side wall portions opposite to each other in a second direction orthogonal to the first direction, with the power storage stack located in between; and a plurality of stoppers located outside each of opposite sides of the power storage stack in the second direction and arranged between the power storage stack and each side wall portion. On an outer main surface of each restraint plate, a plurality of reinforcing portions arranged in a third direction orthogonal to the first and second directions are disposed, and each stopper is disposed at a position overlapping, in the first direction, a corresponding reinforcing portion of the plurality of reinforcing portions.