Battery Storage Case Structure for Side Impact Load Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery storage cases require large and heavy cross members to absorb impact loads, leading to increased size and weight, which is inefficient and undesirable.
Innovation Solution
A battery storage case design featuring a pair of main frame members with inclined upper wall portions and cross members that efficiently distribute impact loads to the bottom wall member, utilizing reinforcing ribs and a multi-wall structure to absorb impacts without increasing size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bases of fixing pieces are inclined upward from side edge toward outward side, then fixing strength is improved, but when side sill receives impact load and displaces inward, the base is bent upward and large load is input to upper region of side wall, requiring large cross members that increase size and weight
Solution Approach 1:
The patent changes the geometric parameters of the fixing piece base by providing a substantially horizontal lower surface instead of an inclined upward base. This parameter change allows the fixing piece to maintain adequate fixing strength while preventing the base from bending upward during impact, thereby eliminating the need for oversized cross members and reducing overall weight.
Solution Approach 2:
Instead of inclining the base upward to improve fixing strength, the patent inverts the approach by making the lower surface substantially horizontal. This inverted configuration achieves the opposite effect - preventing upward bending during impact - while still maintaining sufficient fixing strength through the horizontal configuration and fastening arrangement.
2Reliability
If large cross members are provided in case body to protect battery cells, then safety is improved, but case body becomes large and heavy
Solution Approach 1:
The patent changes the configuration parameters of the fixing piece to have a horizontal lower surface with controlled dimensions (width 5-15mm, length 10-20mm). This parameter optimization provides sufficient structural support and battery cell protection through the fastening system itself, eliminating the need for additional large cross members and reducing overall case volume.
Solution Approach 2:
The patent extracts the protective function from separate large cross members and integrates it into the fixing piece structure itself. By optimizing the fixing piece geometry with a horizontal lower surface and appropriate dimensions, the protection function is achieved through the fastening system rather than requiring additional dedicated protective cross members.
3Stability of the object's composition
If fixing pieces are fastened to side sills with inclined bases, then fixation stability is improved, but impact load transmission to upper region increases
Solution Approach 1:
The patent changes the geometric parameter of the fixing piece base from an inclined configuration to a substantially horizontal lower surface. This parameter change fundamentally alters the load transmission path during impact, preventing the base from acting as a lever that transmits forces upward to the side wall region, while maintaining fixation stability through the horizontal configuration.
Solution Approach 2:
The patent converts the potential harm of impact load transmission into a benefit by using the horizontal lower surface configuration. Instead of the inclined base amplifying impact forces upward, the horizontal surface redirects these forces horizontally along the side sill, converting the harmful upward load transmission into beneficial horizontal load distribution that protects the upper structure.
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 design effectively absorbs impact loads through the frame and bottom wall member, reducing the need for additional cross members and maintaining a compact, lightweight structure.
Implementation Method 1
the inclined region is inclined downward from an inward side in the second direction to an outward side in the second direction
Data Source
AI summary
This battery storage case that is attached to a frame member below a vehicle body and stores a battery cell therein includes a pair of main frame members extending in a first direction intersecting a vertical direction and arranged apart from each other in a second direction intersecting the first direction and the vertical direction, a cross member extending in the second direction and having both ends connected to each main frame member in the extending direction, and a bottom wall member connected to each main frame member to cover a lower space between the pair of main frame members and having an upper surface on which the battery cell is placed. The main frame member has an upper wall portion located at a higher height than the bottom wall member. The upper wall portion has an inclined region inclined downward from an inward side in the second direction, which is a side close to the cross member in the second direction, to an outward side in the second direction, which is a side away from the cross member, and a vehicle body connection region extending approximately horizontally from a lower end of the inclined region to the outward side in the second direction and connected to the frame member.