Cylindrical Cell Holder Structure for Side-Impact Load Absorption
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Solution Overview
Problem
Existing power storage modules in vehicles face challenges in reducing the load applied to power storage devices during impact events, such as side collisions, which can lead to deformation and safety hazards.
Innovation Solution
The power storage module incorporates a holder structure with specific gaps and impact buffers to disperse and absorb the load, featuring support parts, fragile parts, and leaf springs that rupture under stress to reduce the impact on the power storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recessed shape is provided for a holder to cause rupture upon side collision, then the load on power storage devices is reduced, but the holder structure becomes more complex
Solution Approach 1:
The holder is divided into a body and an outer peripheral part with gaps between them. The outer peripheral part is further segmented into multiple impact buffers positioned at different locations. This segmentation allows each component to perform its specific function: the body holds the power storage device, the gaps provide movement space, and the impact buffers absorb impact loads through controlled rupture.
Solution Approach 2:
Impact buffers are pre-installed in the gaps between the body and outer peripheral part of the holder. These buffers are designed to rupture under impact conditions, providing beforehand cushioning that absorbs impact energy before it reaches the power storage device. This prior cushioning mechanism ensures safety without requiring complex active control systems.
2Reliability
If the holder structure is made more robust to protect power storage devices, then the safety is improved, but the impact load absorption capability is reduced
Solution Approach 1:
Impact buffers serve as intermediary elements positioned between the outer peripheral part and the body of the holder. These buffers mediate the transmission of impact forces by absorbing energy through controlled rupture. The gaps between the body and outer peripheral part also act as intermediaries, providing space for the impact buffers to deform and for the body to move during impact, thereby reducing the force transmitted to the power storage device.
Solution Approach 2:
The holder structure utilizes parameter changes in the impact buffers, which are designed with specific material properties and geometric parameters that allow them to rupture at predetermined impact force levels. The gaps between the body and outer peripheral part are dimensioned to provide optimal movement space. These parameter optimizations enable the structure to absorb impact loads effectively while maintaining protection of the power storage device.
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 holder structure effectively absorbs and disperses impact loads, reducing the load on power storage devices and enhancing the module's withstand capacity during collisions.
Implementation Method 1
an impact buffer is provided in a first gap among the gaps, the first gap being between the body and the outer peripheral part in the first direction
Implementation Method 2
the holder includes a body and an outer peripheral part, the body including a housing configured to hold the power storage device
Data Source
AI summary
This power storage module comprises at least one cylindrical power storage device (60), and a lower holder (11) that holds the power storage device (60) in the axial direction (Z). The lower holder (11) includes a body (12) which includes a container portion (12A) that holds the power storage device (60), and an outer peripheral portion (13) that surrounds the body (12) with a gap (14) provided from the body (12). If a direction orthogonal to the axis direction (Z) of the power storage device (60) is a direction (Y), and a direction orthogonal to both the axial direction and the direction (Y) is a direction (X), the gap (14) includes a gap (14A) between the body (12) and the outer peripheral portion (13) in the direction (Y), in which gap (14A) a shock absorbing portion is provided.