Electricity Storage Device Wire Harness Vibration Damping
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Solution Overview
Problem
The existing electricity storage devices generate discomforting vibrating sounds due to vibrating wire harnesses coming into contact with the case member during charging and discharging, and lack a vibration prevention structure for the wire harnesses connected to the electricity storage modules.
Innovation Solution
An electricity storage device with a vibration damping material placed between the wire harnesses and the case, biasing the longest wire harness toward the electricity storage module case, and harness holders that support the wire harnesses to absorb vibration energy and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire harnesses are used to connect electricity storage modules, then electrical connection is achieved, but vibrating sound is generated during charging/discharging
Solution Approach 1:
A vibration damping material is introduced as an intermediary between the wire harness and the electricity storage case. This mediator absorbs the vibration energy transmitted from the wire harness, preventing it from contacting the case and generating sound, while maintaining the electrical connection function of the wire harness.
Solution Approach 2:
The vibration damping material converts the harmful vibration energy into a beneficial damping effect. By placing the vibration damping material between the wire harness and the case, the vibration that would otherwise cause harmful contact noise is transformed into absorbed energy that stabilizes the wire harness position.
2Reliability
If wire harnesses are made with large thickness to handle large current, then resistance is reduced, but vibration damping capability is insufficient
Solution Approach 1:
The vibration damping material serves as a mediator that compensates for the insufficient vibration damping capability of the thick wire harness. While the wire harness maintains its large thickness for electrical conduction, the vibration damping material handles the vibration control function.
Solution Approach 2:
The solution combines the wire harness (for electrical conduction) with the vibration damping material (for vibration control) into a composite structure. This composite approach allows each component to perform its specialized function without compromise.
3Object-generated harmful factors
If vibration damping material is added to suppress vibrating sound, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The vibration damping function is extracted as a separate component (vibration damping material) rather than trying to modify the wire harness itself. This allows the wire harness to focus on electrical connection while the extracted vibration damping component handles noise suppression.
Solution Approach 2:
The vibration damping material is placed locally at the specific position where wire harness contact with the case occurs. This localized approach addresses the noise problem only where it arises, rather than requiring comprehensive structural modifications throughout the entire device.
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
The solution effectively suppresses the vibrating sound generated by wire harnesses during charging and discharging by absorbing vibration energy, improving the noise reduction and stability of the electricity storage device.
Implementation Method 1
a vibration damping material provided in a space region between one surface of the electricity storage case and, among the plurality of wire harnesses, at least a wire harness including the longest length extending in an arrangement direction of the electricity storage modules
Implementation Method 2
the wire harness including the longest length extending in the arrangement direction of the electricity storage modules is biased toward a side of the electricity storage module case by the one surface of the electricity storage case, through the vibration damping material
Data Source
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AI summary
An electricity storage device including: a plurality of electricity storage modules, each including an electricity storage module case, a plurality of electricity storage cells housed in the electricity storage module case, and external terminals of positive and negative electrodes; an electricity storage case in which the plurality of electricity storage modules are arranged and housed; a plurality of wire harnesses connected to the external terminals of the positive and negative electrodes of the electricity storage modules; and a vibration damping material provided in a space region between one surface of the electricity storage case and, among the plurality of wire harnesses, at least a wire harness including the longest length extending in an arrangement direction of the electricity storage modules, wherein the wire harness including the longest length extending in the arrangement direction of the electricity storage modules is biased toward a side of the electricity storage module case by the one surface of the electricity storage case, through the vibration damping material.