Bipolar Power Storage Module Sealing for Moisture-Safe Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power storage modules face challenges in effectively suppressing moisture intrusion while preventing short-circuiting, particularly when using a sheet member with a metal layer to ensure conduction between the laminate and conductive members.
Innovation Solution
A power storage module design featuring a laminate with a pair of sheet members, each comprising insulating layers and a metal layer, where peeling portions of the insulating layers are exposed to face the anode and cathode terminal electrodes, ensuring electrical connection while minimizing moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sheet member with a metal layer is used to ensure electrical conduction between the laminate and conductive members, then electrical conductivity is improved, but moisture intrusion risk increases
Solution Approach 1:
The sheet member is constructed as a composite structure with a metal layer for electrical conductivity and an insulating layer for moisture protection. This composite material approach allows the single component to simultaneously provide both electrical conduction and moisture barrier functions, resolving the contradiction between improving conductivity and preventing moisture intrusion.
2Object-affected harmful factors
If the sheet member completely covers the laminate for moisture protection, then moisture intrusion is suppressed, but electrical connection between terminal electrodes and conductive members is lost
Solution Approach 1:
The sheet member is segmented into different functional zones: a covered region providing moisture protection and an exposed region enabling electrical connection. This segmentation allows the sheet member to simultaneously perform both moisture barrier and electrical conduction functions by dividing its structure into distinct segments with different protective characteristics.
3Reliability
If terminal electrodes are exposed for electrical connection, then conductivity is maintained, but moisture easily enters from between the sheet member and terminal electrodes
Solution Approach 1:
The insulating layer acts as an intermediary element between the metal layer and the terminal electrodes. It provides a transition zone that maintains electrical connection while preventing direct moisture contact, serving as a mediator that reconciles the conflicting requirements of electrical conductivity and moisture protection at the interface between the sheet member and terminal electrodes.
Data Source
AI summary
A power storage module includes a laminate including a plurality of stacked electrodes and a pair of sheet members joined to each other, and an outer encasement for sealing the laminate inside, the plurality of electrodes including a cathode terminal electrode including a cathode active material layer, an anode terminal electrode including an anode active material layer, and a bipolar electrode disposed between the cathode terminal electrode and the anode terminal electrode, wherein each of the pair of sheet members has a peeling portion in which a portion of each of the pair of insulating layers is peeled from a metal layer disposed between the pair of insulating layers, and one of the pair of sheet members is disposed so as to face the anode terminal electrode, and the other peeling portion of the pair of sheet members is disposed so as to face the cathode terminal electrode.