Power Storage Unit Holder Structure for Short-Circuit Isolation
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Solution Overview
Problem
There is a demand to further reduce the size of power storage units, which currently face challenges in minimizing size while preventing short-circuiting between the metal case and power storage elements.
Innovation Solution
The power storage unit incorporates a resin holder with pillar portions protruding toward the upper side, a circuit board with wiring connected to the power storage element, and a metal case that fixes an open end to the circuit board, thereby suppressing bending and short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power storage unit uses a conventional holder configuration without pillar portions, then the structure is simpler, but the gap between the metal case and power storage elements must be excessively large to prevent short-circuiting, increasing the overall size
Solution Approach 1:
The resin holder acts as an intermediary component between the metal case and the power storage elements. It provides electrical insulation while mechanically supporting the power storage elements, allowing the gap between the metal case and elements to be reduced without risking short-circuits. The holder's insulating properties eliminate the need for excessive spacing that would otherwise be required for safety.
Solution Approach 2:
The pillar portions extend in the vertical dimension from the holder body, creating a three-dimensional structure that provides insulation support at multiple heights. This dimensional extension allows the power storage elements to be positioned closer to the metal case while maintaining adequate insulation distance through the vertically protruding pillar portions.
2Reliability
If the holder includes pillar portions protruding toward the upper side, then short-circuit prevention is improved, but the holder structure becomes more complex
Solution Approach 1:
The pillar portions are integrated into the holder body as a unified structure rather than being separate components. The holder and pillar portions are formed as one piece, combining the support function and insulation function into a single component, which reduces overall structural complexity despite the added vertical protrusions.
Solution Approach 2:
The pillar portions serve multiple functions simultaneously: they provide electrical insulation between the metal case and power storage elements, provide mechanical support for the power storage elements, and define the spacing geometry. This multi-functionality reduces the need for additional separate components.
Data Source
AI summary
A power storage unit includes: a resin holder configured to accommodate a power storage element with the power storage element partially exposed to an upper side; a circuit board that includes wiring electrically connected to the power storage element and is fixed to a lower side of the holder; and a metal case configured to accommodate the power storage element and the holder by fixing an open end that is open to the lower side to the circuit board. The holder includes one or more pillar portions protruding toward the upper side relative to the power storage element.