Vehicle Battery Case Recess Layout for Water Ingress Protection
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Solution Overview
Problem
Existing vehicle battery cases are prone to water ingress, which can lead to reduced battery performance due to water adherence and immersion, necessitating improved water management solutions.
Innovation Solution
A vehicle battery case design featuring a recess at the rear side of the bottom plate in the front-rear direction with a water amount detection unit to store and detect water, along with bead portions and recesses at corners to prevent immersion and adherence of water to battery modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery case is positioned low to the vehicle floor for compact installation, then space utilization is improved, but water ingress risk increases causing battery performance reduction
Solution Approach 1:
The bottom plate is segmented into a first area and a second area at different heights, creating a stepped structure that separates the battery mounting surface from the water accumulation zone, thus protecting the battery while maintaining compact space utilization
Solution Approach 2:
The solution introduces a vertical height dimension difference between the first and second areas of the bottom plate, using elevation change to prevent water contact with the battery while keeping the overall footprint compact
2Reliability
If rainwater accumulates on the road surface and splashes or immerses the lower vehicle body, then water enters the battery case, but adding water prevention structures increases device complexity
Solution Approach 1:
The water prevention function is merged into the bottom plate structure itself by creating a stepped configuration, eliminating the need for separate water barriers or complex sealing systems while maintaining effective water protection
Solution Approach 2:
The bottom plate serves multiple functions: it provides structural support, defines the internal space, and simultaneously acts as a water prevention structure through its stepped design, reducing the need for additional specialized components
3Reliability
If water accumulates on the bottom plate, then water adheres to battery cells reducing performance, but creating drainage paths may compromise structural integrity
Solution Approach 1:
The bottom plate has different local qualities with the first area providing a flat, stable mounting surface for the battery while the second area is positioned at a lower height to collect and contain water, with each region optimized for its specific function without compromising overall strength
Data Source
AI summary
A battery case of a battery includes a lower case. A recess is provided near a corner on a rear side of a bottom plate of the lower case in a front-rear direction of a vehicle, and the lower case can store water in the recess. This allows the battery case to increase the amount of water that can immerse a battery module, and restrain the battery module from being immersed in water as compared to a case in which no recess is provided in the bottom plate.