Flexible PCB Layout in Power Storage Modules for Vibration Stress Relief
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Solution Overview
Problem
Conventional power storage modules with flexible printed circuit boards do not adequately suppress excessive stress at elements and solder-connected portions, particularly under vibration.
Innovation Solution
A power storage module design that includes a stack of power storage cells, a resin plate, a flexible printed circuit board with an electric circuit connected to the cells, and an element positioned strategically relative to fixation points on the circuit board to minimize stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elements are provided on the flexible printed circuit board, then the electric circuit functionality is improved, but stress concentration at the elements and solder-connected portions occurs
Solution Approach 1:
The patent applies local quality by creating different structural zones: a first region with fixation portions for mounting the flexible printed circuit board, and a second region without fixation portions where elements are mounted. This spatial differentiation allows the fixation areas to provide structural support while the element mounting area minimizes stress concentration, thereby maintaining circuit functionality while reducing stress at critical points.
Solution Approach 2:
The patent segments the flexible printed circuit board into distinct functional regions: a first region dedicated to fixation with multiple fixation portions, and a second region for element mounting without fixation portions. This segmentation allows each region to optimize its specific function - the first region provides structural support while the second region minimizes stress on elements and solder connections.
2Stability of the object's composition
If the flexible printed circuit board is fixed at multiple positions, then the structural stability is improved, but the stress distribution becomes uneven causing excessive stress at certain points
Solution Approach 1:
The patent applies local quality by creating different structural zones: a first region with fixation portions for mounting the flexible printed circuit board, and a second region without fixation portions where elements are mounted. This spatial differentiation allows the fixation areas to provide structural support while the element mounting area minimizes stress concentration, thereby maintaining circuit functionality while reducing stress at critical points.
3Volume of moving object
If elements are positioned close to fixation portions, then the device size is reduced, but the stress at solder-connected portions increases excessively
Solution Approach 1:
The patent segments the flexible printed circuit board into distinct functional regions: a first region dedicated to fixation with multiple fixation portions, and a second region for element mounting without fixation portions. This segmentation allows each region to optimize its specific function - the first region provides structural support while the second region minimizes stress on elements and solder connections.
Data Source
AI summary
A power storage module includes: a stack of a plurality of power storage cells; a resin plate placed on the stack of the plurality of power storage cells; a flexible printed circuit board placed on the resin plate and having an electric circuit electrically connected to the plurality of power storage cells; and an element provided on the electric circuit. The flexible printed circuit board is fixed to the resin plate at a fixation position including a first fixation portion and a second fixation portion. The first fixation portion and the second fixation portion are separated from each other by a first distance (L1) along the stacking direction, and the element is provided at a position separated from the first fixation portion or the second fixation portion by a second distance (L2) along the stacking direction, the second distance (L2) being less than or equal to ⅓ of the first distance (L1).