Pouch Battery Insulating Edge Structure for Module Isolation
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Solution Overview
Problem
Pouch type secondary batteries face issues with electrical insulation due to exposure of the metal layer, leading to leakage currents and potential damage from arcs, necessitating additional insulation designs when used in modules.
Innovation Solution
The pouch type secondary battery incorporates an insulating edge part with stacked insulating layers to secure a sufficient electrical insulation distance between the electrode lead and metal layer, eliminating the need for additional insulation in secondary battery modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a pouch-type secondary battery has a large capacity (e.g., 5 Ah or more), then the battery can provide sufficient energy for electric vehicles, but the battery may be deformed during transportation or when mounted in a vehicle
Solution Approach 1:
The pouch-type secondary battery is placed inside a container that has substantially the same outer shape as the battery. This nested structure provides mechanical support and constraint to the battery pouch, preventing deformation during transportation and mounting while maintaining the battery's high capacity design
Solution Approach 2:
The battery uses a flexible pouch structure with sealing portions at the edges. The pouch design allows the battery to accommodate volume changes during charging/discharging cycles while the sealing portions maintain structural integrity and prevent electrolyte leakage, thus maintaining shape stability without compromising capacity
2Adaptability or versatility
If the battery pouch is made flexible to accommodate volume changes, then the battery can handle expansion during charging, but the battery may be deformed by external forces during transportation
Solution Approach 1:
The flexible pouch battery is nested within a rigid or semi-rigid container that provides external mechanical support. This outer container acts as a protective shell that resists external forces during transportation while allowing the inner pouch to flexibly accommodate volume changes during charging and discharging operations
3Quantity of substance
If the battery is designed with high capacity for electric vehicles, then the energy storage is sufficient, but the battery may explode or cause fire due to internal stress
Solution Approach 1:
The battery design incorporates safety mechanisms including a container structure that provides mechanical cushioning and protection before failure can occur. The sealing portions and container design prevent internal stress from building up to dangerous levels, and provide controlled containment in case of thermal runaway, preventing explosion and fire hazards associated with high-capacity batteries
Data Source
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AI summary
The present invention relates to a pouch type secondary battery, a secondary battery module including the same, and a pouch therefor, and more particularly, to a pouch type secondary battery with improved insulation performance, a secondary battery module including the same, and a pouch therefor. The present invention may provide a pouch type secondary battery including an electrode assembly, which includes an electrode and a separator, and a pouch in which the electrode assembly is embedded. The pouch type secondary battery is characterized in that the pouch includes: an accommodation part in which the electrode assembly is accommodated; and an edge part disposed along an outer circumference of the accommodation part to define an edge, wherein the edge part includes an insulating layer having an insulating material, and, in the insulating layer, a first insulating layer and a second insulating layer are stacked in sequence from the inside toward the outside.