Flexible PCB Branch Layout for Battery Cell Terminal Movement
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Solution Overview
Problem
Existing voltage monitoring modules struggle to effectively follow the movement of cell terminals due to significant contraction or expansion of battery cells, leading to potential disconnection issues.
Innovation Solution
A flexible printed board with branch portions of varying lengths, where the branch portions farther from a reference position have longer dimensions, allowing connection terminals to accommodate larger movements of cell terminals during contraction and expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all branch portions are made equal in length, then the structure is simple and easy to manufacture, but connection terminals cannot follow the movement of cell terminals during battery cell expansion and contraction
Solution Approach 1:
The patent applies local quality by making different branch portions have different lengths according to their specific positional requirements. Branch portions farther from the reference position have longer lengths to accommodate larger movements of cell terminals in those regions, while closer branch portions have shorter lengths. This localized adaptation ensures each connection terminal can follow its corresponding cell terminal's movement without requiring all branches to be uniformly long.
2Reliability
If branch portions farther from reference position are made longer, then connection terminals can follow cell terminal movement better, but the overall structure becomes more complex
Solution Approach 1:
The patent applies dynamics by designing the flexible printed board with varying branch lengths that adapt to the dynamic expansion and contraction of battery cells during charge and discharge cycles. The differential length configuration allows the board to dynamically accommodate cell terminal movements without requiring complex external adjustment mechanisms, maintaining connection stability through inherent structural adaptability.
Data Source
AI summary
A voltage monitoring module includes a flexible printed board including a plurality of wires, in which: the flexible printed board includes: a main body extending in a first direction; and a plurality of branch portions each branching off the main body, the plurality of branch portions being placed intermittently in the first direction, each of the branch portions includes, at a part on a distal end side thereof, a connection terminal to be connected to a cell terminal being a terminal of a battery cell of a battery pack having a plurality of the stacked battery cells, and among the plurality of branch portions, the branch portion located farther in the first direction from a reference position has a longer length dimension from a proximal end of the branch portion to the connection terminal.