Battery Module Wiring Guide With Movable Thermal Expansion Restraint
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Solution Overview
Problem
The existing power storage devices face damage to guide members due to differences in linear expansion coefficients between the module stacked body and the guide member, leading to detachment during expansion and contraction.
Innovation Solution
A power storage device design featuring guide members with extending portions and engagement portions that are fixed and engaged with restraint plates, allowing for movement in multiple directions to absorb expansion and contraction differences, along with a duct system for enhanced cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide member is fixed rigidly to the restraint plates, then the wiring can be reliably guided and disposed on the side surface, but the guide member will be damaged due to expansion and contraction differences between the module stacked body and the guide member
Solution Approach 1:
The guide member is designed with a movable engagement portion that can move in the first direction (stacking direction) and second direction (orthogonal direction) relative to the restraint plates. This dynamic design allows the guide member to accommodate thermal expansion and contraction differences between the module stacked body and guide member, preventing damage while maintaining reliable wiring guidance through the wiring guide portion.
2Strength
If the guide member is made movable to accommodate expansion differences, then damage to the guide member is reduced, but the guide member may become detached from the restraint plates
Solution Approach 1:
The guide member is segmented into distinct functional portions: a first extending portion with a fixing portion for secure attachment to the first restraint plate, a wiring guide portion for guiding wiring, and an engagement portion that movably engages with the second restraint plate. This segmentation allows different portions to perform different functions - secure attachment where needed and controlled movement where expansion accommodation is required.
Solution Approach 2:
Different portions of the guide member have different degrees of freedom and attachment characteristics. The fixing portion provides rigid fixed attachment to prevent detachment, while the engagement portion provides controlled movable attachment to accommodate expansion. The wiring guide portion maintains its guiding function throughout. This local differentiation of attachment qualities allows simultaneous achievement of secure attachment and expansion accommodation.
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 prevents damage to guide members by accommodating thermal expansion differences and enhances cooling efficiency through divided cooling spaces and strategically placed guide members.
Implementation Method 1
the first engagement portion moves in the first direction and the second direction while being coupled to the second restraint plate. In addition, if the module stacked body expands and contracts in the first direction when the power storage device is charged and discharged, the first engagement portion also moves in the first direction while being coupled to the second restraint plate. Accordingly, a difference in amount of expansion and contraction caused between the module stacked body and the guide member is absorbed
Data Source
AI summary
A power storage device includes: a module stacked body including a plurality of power storage modules stacked in a first direction and having a first side surface extending in the first direction and a second direction orthogonal to the first direction and a second side surface adjacent to the first side surface and extending in the first direction and a third direction orthogonal to the first side surface and the second direction; a first restraint plate and a second restraint plate stacked on both sides of the module stacked body in the first direction and applying a restraint load to the module stacked body in the first direction; a wiring connected to the module stacked body; and a guide member coupled to the first restraint plate and the second restraint plate and disposing the wiring on the first side surface.