Folded Case Structure for Vibration-Resistant Temperature Sensing
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Solution Overview
Problem
Existing temperature measurement devices in batteries for electric vehicles suffer from reduced durability due to vibrations causing cyclic stress and repeated contact, leading to deterioration of the flexible printed circuit board components.
Innovation Solution
The temperature measurement device incorporates a case with a first and second case portion and a holding portion that folds over the branch of the flexible printed circuit board, restraining its movement and preventing swinging, thereby enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the branch of the flexible printed circuit board is left floating in air, then the device structure is simple and easy to manufacture, but vibrations cause cyclic stress and repeated contact leading to deterioration and shortened lifespan
Solution Approach 1:
The holding portion is formed by folding the case itself, creating a nested structure where the case contains a support configuration that restrains the branch. This nesting approach provides durability improvement without adding separate external components, thus maintaining manufacturing simplicity while enhancing reliability.
Solution Approach 2:
The case is divided into functional portions (first case portion, second case portion, and holding portion) with specific roles. The holding portion is created by folding the second case portion, segmenting the case structure to provide both support and restraint functions, thereby improving reliability without significantly increasing overall complexity.
2Duration of action of stationary object
If the branch is restrained by a holding portion, then cyclic stress and movement are reduced extending device lifespan, but the case structure becomes more complex requiring folding and holding mechanisms
Solution Approach 1:
The holding portion is created through folding the second case portion, transforming a static case structure into a dynamic configuration that can adapt to the branch position. This dynamic folding structure provides effective restraint while maintaining manufacturing feasibility, extending device service life without excessive complexity.
Solution Approach 2:
The case itself serves dual purposes: providing structural housing and creating the holding portion through its own folding. The case material and structure are utilized to create the restraint mechanism, eliminating the need for separate dedicated restraint components and reducing overall device complexity while extending service life.
Data Source
AI summary
Provided is a temperature measurement device which includes: a case; a flexible printed circuit board; and a thermistor element mounting portion, the case integrally has a first case portion, a second case portion, and a holding portion; the flexible printed circuit board has a trunk and a branch divided from the trunk; the trunk is fixed to a first surface of the first case portion; the thermistor element mounting portion is arranged in the branch and is fixed to a first surface of the second case portion; the second case portion is folded such that a second surface of the first case portion and a second surface of the second case portion are in contact with each other; and the holding portion holds a part of the branch between a portion divided from the trunk and a portion where the thermistor element mounting portion is arranged.