Battery Pack Relay Mounting for Vibration Noise Suppression
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Solution Overview
Problem
The existing battery pack relays in vehicles generate noise due to impact vibrations during operation, which is not effectively dampened by conventional shock absorbing members.
Innovation Solution
A battery pack design with a relay unit that has at least three mounting points on the case's inner surfaces, with the center of gravity of the relay unit coinciding with the center of a polygon formed by these mounting points, using an L-shaped fixture to secure the relay to both the top and inner side surfaces, and employing a higher number of mounting points on a surface parallel to the relay's operation direction to absorb and dissipate vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shock absorbing member is attached to the relay and fixture to dampen shock during movable core sliding, then the impact vibration is absorbed, but a new force is generated that vibrates the relay in a direction parallel to the bottom face, generating noise
Solution Approach 1:
The invention transitions from single-point shock absorption to multi-point distribution. By providing at least three mounting points that form a polygon with the center of gravity at its center, the relay unit distributes vibration forces across multiple dimensions and directions, preventing concentrated vibration that causes noise while maintaining effective shock absorption.
Solution Approach 2:
The invention uses the center of gravity positioning as a counterbalancing mechanism. By ensuring the center of gravity coincides with the center of the polygon formed by mounting points, the design creates a balanced force distribution that counteracts vibration forces, preventing the relay from vibrating in directions parallel to the bottom face and thereby reducing noise generation.
2Reliability
If the relay is mounted on the bottom face of the lower case, then the relay is secured in position, but impact vibrations during operation are transmitted to the lower case and battery pack, generating noise
Solution Approach 1:
The invention segments the mounting structure from a single mounting point to multiple mounting points (at least three) forming a polygon. This segmentation distributes the mounting function across multiple locations, improving stability while dispersing vibration transmission paths, thereby reducing noise without compromising relay security.
Solution Approach 2:
The invention adds spatial dimensionality to the mounting arrangement by requiring mounting points to form a polygon with the center of gravity at its center. This geometric configuration creates a stable, balanced mounting structure that resists vibration in multiple directions, effectively reducing noise transmission to the lower case and battery pack.
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
This configuration effectively suppresses noise generated by the relay's operation by stabilizing the relay unit and dispersing impact vibrations, reducing the duration and intensity of noise emissions.
Implementation Method 1
a shock absorbing member (4) (rubber cushion)
Implementation Method 2
shock absorbing member (4) (rubber cushion)
Implementation Method 3
the excitation coil 1a is energized to generate electromagnetic force
Data Source
AI summary
Noise generated by driving a relay provided on a battery pack is suppressed. A negative relay is fixed onto top of a bottom face and an inner side surface of a lower case of the battery pack via multiple mounting points formed on an L-shaped fixture. The center of gravity of the negative relay is located within a polygon having the mounting points as vertices.