Battery Pack Hold-Down Bracket Protrusions for Vibration Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery packs face issues with unstable coupling between the hold-down bracket and the base plate due to loosening from vibrations and uneven height differences among battery modules, leading to inconsistent force application.
Innovation Solution
A battery pack design featuring a hold-down bracket with protrusion structures on its lower end portion that contacts the base plate, enhancing the coupling force and stability by using protrusions and elastic materials to secure a stable fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hold-down bracket is used to fix the battery module assembly to the base plate, then the battery module assembly is fixed in position, but the coupling force is insufficient and loosening occurs due to vibration and impact
Solution Approach 1:
The lower end portion of the hold-down bracket is divided into multiple protrusion structures (first, second, third protrusions) that contact different locations on the base plate. This segmentation distributes the coupling force across multiple contact points, preventing loosening while maintaining strong overall coupling.
Solution Approach 2:
The protrusion structures are strategically positioned at specific locations on the lower end portion of the hold-down bracket to contact corresponding areas on the base plate. This local quality enhancement ensures that force is applied at optimal points to maximize coupling strength and prevent vibration-induced loosening.
2Reliability
If a plurality of battery modules is individually fixed, then each battery module is secured, but tolerance occurs due to height difference between modules, resulting in non-uniform fixing force
Solution Approach 1:
Multiple protrusion structures are provided on the hold-down bracket, with each protrusion contacting a different location on the base plate. This segmentation allows the bracket to accommodate height variations among battery modules while maintaining uniform fixing force through distributed contact points.
Solution Approach 2:
The protrusion structures have different heights and are positioned at different locations to compensate for height differences between battery modules. By varying the parameters (height, position) of the protrusions, uniform fixing force is achieved despite manufacturing tolerances in module heights.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a battery pack including a battery module assembly including two or more battery modules, each of the battery modules having one or more battery cells arranged adjacent to each other in the state of being mounted in cartridges, a base plate having the battery module assembly loaded thereon, and a hold-down bracket fixing the battery module assembly to the base plate, wherein each of the cartridges includes a step portion having a lower part protruding outwards, the hold-down bracket includes an upper end portion covering upper surfaces of the step portions of the cartridges, a lower end portion coupled to the base plate, and a middle portion connecting the upper end portion and the lower end portion to each other, and a protrusion structure protruding in a direction toward the base plate is formed on the lower end portion.