Vehicle Battery Mounting Structure for Side-Impact Seal Protection
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Solution Overview
Problem
As battery units in electrified vehicles increase in size to enhance charging capacity, the clearance between the battery unit and the vehicle frame decreases, increasing the risk of collision and damage to the sealing portion during a side impact, leading to potential loss of sealing and inadequate protection of the battery.
Innovation Solution
A battery mounting structure with a side frame positioned on the outer side of the battery unit, incorporating a sealing portion above the side frame and a shock-absorbing member with a vertical portion to absorb impact, ensuring the sealing portion remains intact during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery unit is upsized to secure larger charging capacity, then the charging capacity is improved, but the clearance between the battery unit and the frame decreases, increasing the risk of collision and damage to the sealing portion
Solution Approach 1:
The patent positions the sealing portion in the vertical dimension (above the upper surface of the side frame) rather than allowing it to be at the same level as the frame. This dimensional relocation prevents horizontal collision between the sealing portion and frame during side impacts, resolving the contradiction between battery size expansion and sealing protection.
Solution Approach 2:
The patent introduces a shock-absorbing member between the battery case and side frame that deforms under impact to absorb collision energy before it reaches the sealing portion. This preliminary cushioning mechanism protects the sealing portion from damage even when the battery unit is upsized and clearance is reduced.
2Quantity of substance
If the battery unit is upsized, then the charging capacity is improved, but the clearance between the battery unit and the frame decreases, increasing the risk of strike against the frame during side collision
Solution Approach 1:
By relocating the sealing portion to a higher vertical position above the side frame's upper surface, the patent creates spatial separation that prevents the battery unit from striking the frame during side collisions, even when upsized.
Solution Approach 2:
The shock-absorbing member acts as an intermediary element between the battery case and side frame, absorbing impact energy and preventing direct transmission of collision forces to the battery unit, thereby reducing collision risk.
3Device complexity
If the sealing portion is positioned lower, then the battery case structure is simplified, but the sealing portion is vulnerable to damage during side collision
Solution Approach 1:
The patent resolves this contradiction by positioning the sealing portion in the vertical dimension above the side frame, maintaining structural simplicity while achieving protection through spatial relocation rather than complex reinforcement.
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
Prevents damage to the sealing portion and maintains battery protection, allowing for a larger battery size and capacity while reducing impact transmission to the battery unit.
Implementation Method 1
an inner shock absorbing member that absorbs a shock by being crushed and includes a vertical portion disposed between the side frame and the battery case
Data Source
AI summary
A battery mounting structure includes a battery unit disposed under a vehicle floor and including a battery and a battery case accommodating the battery, and a side frame disposed outside the battery unit in a vehicle width direction, wherein the battery case includes a lower case, an upper case covering an upper end opening of the lower case from above, and a sealing portion that connects the lower case and the upper case to seal the battery case, and the sealing portion is positioned above an upper surface of the side frame.