Battery Pack Fire Extinguishing Body for Easy Agent Replacement
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Solution Overview
Problem
In battery packs, particularly for in-vehicle lithium-ion batteries and storage batteries, the fire extinguishing agent requires frequent replacement, and the resin film covering it becomes brittle and prone to breakage within one to five years, making it difficult to replace the fire extinguishing agent without damaging it.
Innovation Solution
A fire extinguishing body with a substrate having a Young's modulus of 2 MPa or more, which can include a resin layer, wood, metal, or glass layers, allowing for easy replacement and integration into battery packs, along with a fire extinguishing agent-containing layer that can be easily accessed and replaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin film is used to cover the fire extinguishing agent, then the fire extinguishing function is secured, but the film becomes brittle and prone to breakage within one to five years, making replacement difficult
Solution Approach 1:
The fire extinguishing body is segmented into a substrate and a fire extinguishing agent-containing layer that can be separately replaced. The substrate remains in the battery pack while the agent-containing layer can be removed and replaced independently, solving the replacement difficulty caused by the brittle film.
Solution Approach 2:
The fire extinguishing body uses a composite structure combining a substrate (resin, metal, or glass) with a fire extinguishing agent-containing layer. This composite design provides both the necessary fire extinguishing function and improved replaceability, as the layer can be detached from the substrate for replacement.
2Reliability
If the fire extinguishing agent is incorporated into the battery can by bonding, then the fire extinguishing function is secured, but the agent cannot be easily replaced without breaking it
Solution Approach 1:
The fire extinguishing body is divided into a substrate and a replaceable fire extinguishing agent-containing layer. This segmentation allows the agent layer to be detached and replaced without damaging the substrate or the new agent layer, enabling easy maintenance while maintaining fire extinguishing reliability.
Solution Approach 2:
The fire extinguishing agent-containing layer is designed to be discarded after use or when depleted, and a new layer can be installed on the retained substrate. This approach enables easy replacement and recovery of the substrate for continued use.
3Adaptability or versatility
If a resin film with low Young's modulus is used, then flexibility is provided, but the film becomes brittle and prone to breakage over time
Solution Approach 1:
The fire extinguishing body combines a substrate with appropriate mechanical properties (resin, metal, or glass) and a fire extinguishing agent-containing layer. This composite structure provides both the necessary flexibility for installation and the resistance to breakage required for long-term reliability and easy replacement.
Solution Approach 2:
The substrate is selected with a Young's modulus of 2 MPa or more to provide sufficient rigidity and resistance to breakage. This parameter change from using simple thin films to using substrates with controlled mechanical properties resolves the contradiction between flexibility and breakage resistance.
Data Source
AI summary
A fire extinguishing body includes a substrate and a fire extinguishing agent-containing layer facing the substrate, the substrate having a Young's modulus of 2 MPa or more.