Single-Sided Battery FPC Layout for Potential-Ordered Monitoring
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Solution Overview
Problem
Existing battery monitoring modules with flexible printed wiring boards face challenges in reducing potential differences between adjacent lines and terminals, leading to increased manufacturing difficulty and cost, especially with double-sided FPCs, and limited connector compatibility with single-sided FPCs.
Innovation Solution
A flexible printed wiring board configuration with a trunk portion, branch portions, and bent portions, where lines are arranged on one surface, allowing for rearrangement to minimize potential differences and accommodate various connectors, using a single-sided FPC with multiple line groups connected to battery terminals in a specific potential order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-sided FPC is used to arrange lines in potential order, then the potential difference between adjacent lines is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional spatial arrangement by folding the single-sided FPC. The bent portion creates a vertical dimension that allows lines to cross without increasing potential difference, achieving the same effect as double-sided FPC but with simpler manufacturing.
Solution Approach 2:
The FPC is divided into distinct functional segments: a trunk portion for main connections, branch portions for distributing to multiple terminals, and a bent portion for spatial rearrangement. This segmentation allows each part to be optimized independently while maintaining overall potential order.
2Reliability
If lines are rearranged to cross each other on a single-sided FPC, then potential order can be achieved, but the manufacturing difficulty and cost increase
Solution Approach 1:
Instead of complex two-dimensional line crossing on a flat surface, the patent uses a three-dimensional folded structure. The bent portion provides a vertical dimension where lines can pass over or under each other without requiring complex routing, significantly simplifying manufacturing.
3Reliability
If the distance between adjacent lines or terminals is reduced, then the potential difference decreases, but short-circuit risk due to migration increases
Solution Approach 1:
The patent arranges lines in strict potential order (V(0), V(1), V(2), ... V(2n)) along the folded structure. By maintaining equipotential relationships through the folding geometry, adjacent lines at any point in space have minimal potential difference, reducing both electrical stress and migration risk while keeping distances compact.
4Ease of manufacture
If a single-sided FPC is used with limited connector compatibility, then manufacturing cost decreases, but adapter requirements increase complexity
Solution Approach 1:
The bent portion design serves multiple functions: it rearranges potential order, enables compact spacing, and provides a standardized interface that can accommodate various connector types. This universal design allows the same single-sided FPC structure to work with different connectors without requiring adapters, enhancing versatility while maintaining manufacturing simplicity.
Data Source
AI summary
Provided is a flexible printed wiring board attached to a battery, including: multiple lines are provided only on one surface of the flexible printed wiring board, one end of a first line group and a second line group are respectively connected to one of multiple terminals of the battery, and the other end of the first line group is arranged in a bent portion, and the other end of the second line group and one end of a third line group are arranged at an end portion of a trunk portion, and the other end of the third line group is arranged in the trunk portion, and the bent portion is bent such that the other end of the first line group arranged in the bent portion and the other end of the third line group arranged in the trunk portion are connected to each other.