Battery Pack Hold-Down Bracket Protrusions for Vibration-Stable Fixing
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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 protrude towards the base plate, enhancing the coupling force and ensuring stable fixation by increasing contact area and using fastening members like bolts or screws through through-holes.
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 modules can be secured in position, but the coupling force is insufficient and the bracket loosens due to vibration and impact
Solution Approach 1:
The lower end portion of the hold-down bracket is segmented into multiple protrusion structures (first protrusions at opposite ends, second protrusions in between) that contact the base plate at different locations. This segmentation distributes the coupling force across multiple contact points, preventing loosening while maintaining strong overall attachment.
Solution Approach 2:
The protrusion structures create localized contact points between the hold-down bracket and the base plate. Instead of uniform contact across the entire lower surface, the force is concentrated at specific protrusion locations, increasing the effective coupling strength at each contact point while maintaining overall stability.
2Reliability
If multiple battery modules are individually fixed, then each module can be secured, but tolerance occurs due to height differences between modules, resulting in non-uniform fixing force
Solution Approach 1:
The hold-down bracket serves multiple functions simultaneously: it secures multiple battery modules of different heights through its wrapping structure, provides stable fixation through protrusion contact with the base plate, and distributes coupling force uniformly across all modules. The bracket acts as a universal fixing component that adapts to height variations while maintaining consistent fixing force.
Solution Approach 2:
Multiple battery modules are fixed together as a single assembly using one hold-down bracket rather than individual brackets for each module. The bracket wraps around all modules collectively, and the protrusions contact the base plate at strategic locations, ensuring that fixing force is distributed uniformly across all modules despite height differences.
Data Source
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 allowing the battery module assembly to be 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.