Power Storage Restriction Unit Vibration and Thermal Management
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Solution Overview
Problem
Power storage devices experience deformation and vibration due to charging and discharging, leading to increased load on the accommodation case, and poor heat dissipation, especially in centrally located cells, which can result in elevated temperatures and resonance.
Innovation Solution
A power storage device with a restriction unit comprising a first and second flat plate and a corrugated plate, alternately arranged, that reduces the load applied to the accommodation case by deforming to absorb expansion and enhances heat dissipation through filling portions and a cooling device, while the corrugated plate's design minimizes deformation and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If power storage cells are stacked to form a power storage module, then the energy density is improved, but the heat dissipation performance deteriorates especially for centrally located cells
Solution Approach 1:
The patent divides the power storage module into multiple independent cooling channels by inserting cooling plates between stacked power storage cells. This segmentation allows each cell to have direct access to cooling pathways, preventing heat accumulation in centrally located cells while maintaining high energy density through compact stacking.
Solution Approach 2:
The patent introduces cooling plates as intermediary components between power storage cells. These plates serve as heat transfer mediators that conduct heat away from the cells, particularly from centrally located ones that would otherwise have poor heat dissipation. The cooling plates enable effective thermal management without compromising the compact stacked structure.
2Volume of stationary object
If power storage cells are tightly stacked to reduce size, then the volume efficiency is improved, but the vibration resistance deteriorates due to resonance
Solution Approach 1:
The patent pre-configures damping structures and spacing elements within the power storage module assembly before operation. These structures are designed in advance to provide vibration isolation and prevent resonance, allowing the cells to be tightly stacked for volume efficiency while maintaining vibration resistance through built-in protective features.
Solution Approach 2:
The patent introduces damping structures and spacing elements as intermediary components between power storage cells. These intermediaries absorb and dissipate vibration energy, preventing resonance while allowing tight stacking. The damping structures act as buffers that maintain structural integrity without requiring large spacing between cells.
3Stability of the object's composition
If rigid support structures are used to prevent deformation, then the structural stability is improved, but the adaptability to charging/discharging expansion deteriorates
Solution Approach 1:
The patent employs dynamic support structures that can flexibly adapt to the expansion and contraction of power storage cells during charging and discharging cycles. These structures maintain structural stability through controlled flexibility, allowing the module to accommodate volume changes while preventing excessive deformation that would compromise integrity.
Solution Approach 2:
The patent designs support structures with variable mechanical properties that can change their stiffness or flexibility in response to operational conditions. During charging/discharging when expansion occurs, the structures become more compliant; during normal operation, they provide rigid support. This parameter change enables both structural stability and adaptability to expansion.
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 reduces the load on the accommodation case, suppresses vibration, and improves heat dissipation by allowing the power storage module to deform while maintaining structural integrity and efficiently transferring heat away from centrally located cells.
Implementation Method 1
the power storage module deforms so as to expand in the stacking direction
Implementation Method 2
a corrugated plate disposed between the first flat plate and the second flat plate. The corrugated plate has a plurality of first curved portions and a plurality of second curved portions
Implementation Method 3
the power storage module in the accommodation case may vibrate to thereby cause resonance of the power storage module
Implementation Method 4
The restriction unit includes: an accommodation body that accommodates the first flat plate, the second flat plate, and the corrugated plate; and a dilatancy material accommodated in the accommodation body
Implementation Method 5
upon charging and discharging of the power storage device, the temperature inside the power storage module becomes high
Implementation Method 6
each power storage cell disposed at a position away from the accommodation case has low heat dissipation performance
Data Source
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AI summary
A power storage device (10) includes: a power storage module including a plurality of power storage cells; and a restriction unit disposed between the power storage cells. The restriction unit includes: a first flat plate (532) and a second flat plate (534); and a corrugated plate (520) disposed between the first flat plate (532) and the second flat plate (534). The corrugated plate (520) has a plurality of first curved portions (532) and a plurality of second curved portions (534). Each of the first curved portions (532) has a shape curved to protrude toward one side in the stacking direction (H). Each of the second curved portions (534) has a shape curved to protrude toward the other side in the stacking direction (H). The first curved portions (532) and the second curved portions (534) are alternately arranged in a direction intersecting with the stacking direction (H) and the intersecting direction.