Battery Housing Insulation Sheet Layout for Electrolyte Leak Isolation
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Solution Overview
Problem
In power storage devices, electrolytic solution leaks can lead to short-circuiting between the electrode tab and housing, creating a potential difference between adjacent battery modules, resulting in heat generation and reduced workability during handling.
Innovation Solution
A power storage device design featuring a housing with an insulating sheet between the ceiling surface and the stack, including a projecting portion that guides conductive liquids downward, preventing them from reaching exposed areas and thus suppressing short-circuiting, and using a rib-shaped projecting portion to enhance manufacturing ease and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating sheet is disposed between the ceiling surface and the stack, then insulation performance is improved, but the area of the ceiling surface is reduced due to the exposed area
Solution Approach 1:
The insulating sheet is extended in the vertical dimension by forming a downward projecting portion, which creates a liquid barrier without occupying additional horizontal ceiling surface area. This dimensional transition allows the insulating function to be achieved while preserving the ceiling surface area.
Solution Approach 2:
The insulating sheet is segmented into a ceiling-covered portion and a downward projecting portion, with each segment serving a specific function. The ceiling-covered portion provides insulation, while the projecting portion acts as a liquid barrier, allowing both functions to be achieved independently.
2Reliability
If the insulating sheet covers the entire ceiling surface, then insulation is improved, but welding defects increase due to insulating sheet interference at welded portions
Solution Approach 1:
The insulating sheet is selectively positioned to cover only specific areas of the ceiling surface where insulation is needed, while leaving exposed areas at welded portions uncovered. This local differentiation allows insulation to be maintained in critical areas while avoiding interference with welding operations.
3Reliability
If the insulating sheet extends to the peripheral edges, then insulation coverage is improved, but handling difficulty increases due to excess material
Solution Approach 1:
Instead of extending the insulating sheet horizontally to the peripheral edges, the sheet is extended vertically by forming a downward projecting portion. This dimensional change provides effective liquid barrier coverage without creating excess horizontal material that would complicate handling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively improves the insulation of the housing, preventing short-circuiting and heat generation, while also reducing the risk of welding defects and enhancing the safety and handling of battery cells.
Implementation Method 1
the liquid is guided by the projecting portion and falls downward when the liquid reaches the projecting portion
Data Source
AI summary
A power storage device includes a stack in which a plurality of battery cells is stacked together, a housing that houses the stack, and an insulating sheet disposed between a ceiling surface of the housing and the stack. The ceiling surface includes an exposed area that is not covered with the insulating sheet. The insulating sheet includes a projecting portion projecting downward. The projecting portion is disposed between the stack and the exposed area in plan view.