Coin Battery Pack Terminal Layout With Same-Plane Insulation
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Solution Overview
Problem
The size of coin-type secondary batteries increases when the potential of one polarity is routed from the side surface using a flexible printed circuit (FPC), and reversing the battery for connection methods can deteriorate assembly work efficiency and pose a risk of short circuits.
Innovation Solution
A configuration where both the positive and negative electrode terminals are disposed on one end surface of the battery, with insulating parts ensuring appropriate insulation, using a metal exterior part, first and second external terminals, and a circuit board with connection parts insulated from each other in the same plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both positive and negative electrode terminals are disposed on one end surface, then assembly work efficiency is improved and FPC size is reduced, but insulation between terminals becomes difficult to ensure
Solution Approach 1:
An insulating member is introduced as an intermediary element between the positive electrode terminal and negative electrode terminal. This insulating member is disposed between the terminals to prevent electrical short circuiting while allowing both terminals to be accessed from the same end surface, thus maintaining assembly efficiency while ensuring insulation reliability.
Solution Approach 2:
The insulating function is extracted as a separate component (insulating member) rather than relying on the structural arrangement alone. This dedicated insulating element is positioned between the terminals to provide reliable electrical isolation, solving the insulation problem while keeping the terminal configuration simple for efficient assembly.
2Adaptability or versatility
If potential of one polarity is routed from side surface using FPC, then connection flexibility is improved, but battery size increases
Solution Approach 1:
The terminal arrangement transitions from a side-surface routing configuration to a same-end-surface configuration. By moving both terminals to one end surface, the need for extended FPC routing along the side surface is eliminated, reducing the overall battery volume while maintaining electrical connection functionality through the insulating member.
Data Source
AI summary
A battery pack includes a secondary battery and a circuit board, in which the secondary battery includes a metal exterior part, a first external terminal disposed at a center part of an end surface of the metal exterior part, and a second external terminal disposed so as to surround a periphery of the first external terminal, and the circuit board includes a first connection part connected to the first external terminal and a second connection part connected to the second external terminal; the battery pack including an insulating part that insulates the first connection part from the second connection part, the first connection part and the second connection part being disposed in an identical plane.