Plate Spring Battery Terminal with Bent Portions
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Solution Overview
Problem
Electronic devices using dry batteries face issues with contact resistance due to coil springs, which can lead to plastic deformation and increased resistance when subjected to impact or excessive force, causing the plate spring to lose contact with the battery electrode.
Innovation Solution
A plate spring member with a base portion attached to the battery container side wall, a contact portion for the battery electrode, and a connection portion featuring a first bent portion in an inverted V-shape and a second bent portion that projects towards the battery, distributing stress and preventing plastic deformation by opposing bending directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a coil spring is used as a battery terminal, then the terminal can provide elastic urging force, but the terminal length becomes longer and contact resistance increases
Solution Approach 1:
The plate spring terminal is divided into multiple functional segments: a base portion mounted on the battery container wall, a connection portion with first and second bent portions that provides elastic deformation capability, and a contact portion that contacts the battery electrode. This segmentation allows each part to perform its specific function optimally while keeping the overall terminal length short.
Solution Approach 2:
Instead of using a long linear spring structure, the invention uses a plate spring with bent portions that utilize two-dimensional planar deformation. The first bent portion connects the base and contact portions in an inverted V-shape, while the second bent portion projects toward the battery, allowing elastic urging force to be generated through planar bending rather than linear extension.
2Length of moving object
If a plate spring with shorter terminal length is used, then contact resistance is reduced, but the plate spring is likely to undergo plastic deformation when subjected to impact or excessive force
Solution Approach 1:
The plate spring is designed with dynamic elastic deformation capability through its bent portions. When impact or excessive force is applied, the first and second bent portions can elastically deform to absorb the shock, then return to their original shape, preventing permanent plastic deformation while maintaining reliable electrical contact.
Solution Approach 2:
The bent portions of the plate spring act as pre-designed cushioning elements that can absorb impact energy before plastic deformation occurs. The elastic deformation of these bent portions provides a buffer zone that protects the terminal structure from damage during accidental impacts or excessive force events.
3Reliability
If the plate spring is largely displaced due to impact, then contact is lost with the battery electrode, but using a coil spring increases contact resistance
Solution Approach 1:
The terminal is segmented into a rigid base portion for mounting and a flexible connection portion with bent portions that can elastically deform. This segmentation allows the contact portion to maintain reliable electrical contact through elastic recovery after displacement, while the overall terminal remains compact.
Solution Approach 2:
The plate spring's geometric parameters are optimized with specific bent portion configurations (first bent portion in inverted V-shape, second bent portion projecting toward battery) that provide adequate elastic compliance for maintaining contact under varying conditions, while keeping the terminal length short to minimize contact resistance.
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 plastic deformation of the plate spring while maintaining low contact resistance, ensuring reliable electrical conduction even under impact or excessive force conditions.
Implementation Method 1
a connection portion which connects the base portion and the contact portion while bending, the connection portion comprising a first bent portion that is bent so as to connect the base portion and the contact portion in an inverted V-shape
Data Source
AI summary
The disclosure discloses an electronic device comprising a battery container, a side wall, and a plate spring member. The side wall is disposed upright along a direction orthogonal to an axis of the dry battery. The plate spring member elastically urges the dry battery contained in the battery container. The plate spring member comprises a base portion, a contact portion, and a connection portion. The contact portion is in contact with a positive electrode or a negative electrode of the dry battery. The connection portion connects said base portion and said contact portion while bending. The connection portion comprises a first bent portion and a second bent portion. The first bent portion that is bent so as to connect said base portion and said contact portion in an inverted V-shape. The second bent portion comprises a projecting portion configured to project to the dry battery side.