Coin-Cell Battery PCB Assembly With Controlled Solder Flow
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Solution Overview
Problem
In wearable electronic devices, the soldering process between the coin-cell battery and the printed circuit board can result in excessive solder flow, leading to safety issues and incomplete electrical connections due to inadequate solder control, and the soldering portions may separate upon external impact, disrupting the electrical connection.
Innovation Solution
The electronic device incorporates a solder flow control member on the printed circuit board and a heat-resistant tape to manage solder flow and prevent separation, ensuring controlled electrical connections between the battery's electrodes and the printed circuit board, utilizing a peripheral member to protect the battery from excessive solder and employing electrode taps with protrusions to maintain connection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coin-cell battery is connected to the printed circuit board using traditional soldering, then electrical connection is achieved, but excessive solder flow occurs causing safety issues and incomplete connections
Solution Approach 1:
A solder flow control member is introduced as an intermediary component between the coin-cell battery and the printed circuit board. This member has a first contact portion that contacts the battery electrode and a second contact portion that contacts the PCB, with a controlled solder path between them. The solder flow control member restricts solder flow to prevent excessive solder from causing safety issues while ensuring reliable electrical connection.
Solution Approach 2:
The connection structure is segmented into distinct components: the battery electrode, the solder flow control member, and the PCB contact portion. This segmentation allows independent optimization of each component's function, particularly enabling the solder flow control member to manage solder flow separately from the electrical connection function.
2Ease of manufacture
If the soldering process is performed without additional control structures, then manufacturing simplicity is maintained, but solder flow cannot be precisely controlled leading to safety hazards
Solution Approach 1:
The solder flow control member serves as a mediator that incorporates the precision control function into the existing simple soldering process. By adding this single component with built-in flow restriction features, the patent achieves precise solder flow control without fundamentally changing the soldering process itself, thus maintaining ease of manufacture while improving precision.
3Volume of moving object
If the battery and printed circuit board are directly soldered together, then device compactness is achieved, but the connection is vulnerable to separation under external impact
Solution Approach 1:
The solder flow control member is designed with a structure that preliminarily prepares for impact resistance. The member includes a body portion with a first contact portion for the battery electrode and a second contact portion for the PCB, creating a distributed connection structure that strengthens the joint against external impacts while maintaining compact dimensions.
4Quantity of substance
If excessive solder flows during connection, then complete coverage is achieved, but temperature increases beyond safe ranges and damages battery or surrounding structures
Solution Approach 1:
The solder flow control member acts as a thermal and flow intermediary that limits the quantity of solder in the connection path. By restricting solder flow through its controlled path between the battery electrode and PCB, it prevents excessive solder accumulation that would cause temperature increase beyond safe ranges, thereby protecting the battery and surrounding structures from thermal damage.
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 solution effectively reduces the risk of solder-related safety issues and ensures reliable electrical connections by controlling solder flow and preventing separation, thereby enhancing the miniaturization and stability of wearable electronic devices.
Implementation Method 1
the soldering process between the coin-cell battery and the printed circuit board can result in excessive solder flow
Implementation Method 2
a heat-resistant tape to manage solder flow and prevent separation
Data Source
AI summary
An electronic device including a coin-cell battery is provided. The electronic device further includes a housing, a battery comprising a first surface, a second surface, and a third surface, a first electrode disposed in the first surface and a second electrode disposed in the second surface, a first electrode tap, a second electrode tap, and a printed circuit board connecting the first electrode tap to the second electrode tap of the battery on the third surface. Soldering parts are formed on a first surface of the printed circuit board to connect an end of the first electrode tap to a first contact portion of the printed circuit board and an end of the second electrode tap to a second contact portion of the printed circuit board, respectively. A solder flow control member is formed on a second surface of the printed circuit board.