Button Cell Terminal with Elastic Spring Contact and Pressing Force Absorbing Arm
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Solution Overview
Problem
Conventional button cell terminals with cell holders limit print board design flexibility due to the need for large through holes and lands, and are prone to connection failures from stress and vibration without robust solder connections.
Innovation Solution
A button cell terminal design featuring spring contact terminals and a pressing force absorbing spring portion, which elastically deforms to absorb stress and maintain contact without a cell holder, allowing for automated mounting and improved design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cell holder is used to define the positional relationship between the button cell and the terminal, then the positioning precision is improved, but the device complexity increases and the ease of manufacture decreases due to the need for large through holes and lands
Solution Approach 1:
The invention extracts and eliminates the cell holder component from the conventional structure. The terminal is designed to directly mount on the circuit board without requiring a separate cell holder, thereby simplifying the overall device structure while maintaining positioning precision through the terminal's own structural design
Solution Approach 2:
The invention merges the functions of the cell holder and the terminal into a single integrated terminal structure. The terminal simultaneously provides electrical connection and positional definition for the button cell, eliminating the need for separate positioning components and reducing device complexity
2Strength
If large through holes and lands are used to provide robust solder connections, then the strength is improved, but the area of the print board is reduced
Solution Approach 1:
The invention changes the mounting parameters by transitioning from traditional through-hole mounting with large lands to a surface-mount style installation. The terminal features a flattened portion that makes direct contact with the circuit board surface, requiring only small through holes and lands, thereby reducing the area occupied on the print board while maintaining connection strength
3Ease of manufacture
If the button cell terminal is mounted on the circuit board without a cell holder, then the ease of manufacture is improved, but the reliability decreases due to high stress and vibration susceptibility
Solution Approach 1:
The invention introduces dynamic elements to the terminal structure, including elastic deformation capabilities and flexible contact portions. The terminal can dynamically adapt to stress and vibration through elastic deformation of its components, maintaining reliable electrical connection under varying mechanical conditions while remaining easy to manufacture
Solution Approach 2:
The terminal structure incorporates built-in cushioning elements that anticipate and absorb mechanical stress before it can cause connection failure. The elastic deformation portions and flexible contacts act as pre-designed stress absorption mechanisms that protect the electrical connection during vibration and drops
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 enhances the resilience of button cell connections, preventing instantaneous disconnections and allowing for smaller, more flexible electronic equipment designs by eliminating the need for robust solder connections and cell holders.
Implementation Method 1
the pressing force absorbing spring portion is arranged between the board joint and the spring contact terminal so as to be elastically deformable, and absorbs the pressing force of the button cell received at the spring contact terminal through elastic deformation
Implementation Method 2
the spring contact terminal is pressed by an outer circumferential surface of a positive electrode of the button cell, and is arranged into a spring shape that elastically deforms in accordance with a pressing force exerted from the button cell
Implementation Method 3
the bent arm is arranged into a spring shape that elastically deforms in accordance with the pressing force from the button cell in the X-axis direction and in the Y-axis direction to absorb the pressing force from the button cell
Data Source
AI summary
A button cell terminal to electrically connect to a button cell and a circuit board includes: a spring contact terminal; a board joint; and a pressing force absorbing spring portion. The spring contact terminal is arranged into a spring shape deforming elastically in response to pressing force from the button cell in the X-axis direction and the Z-axis direction. The board joint is joined to the circuit board. The pressing force absorbing spring portion includes a bent arm for absorbing pressing force from the button cell through elastic deformation in response to pressing force from the button cell in the X-axis direction and the Y-axis direction.