Battery Pack Heat-Absorbing Member With Metal-Layer Sealing
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Solution Overview
Problem
The existing battery pack design suffers from moisture permeation through fine voids in the resin layers, leading to a decrease in the heat-absorbing agent, which compromises the safety of the battery pack.
Innovation Solution
A battery pack design featuring a heat-absorbing member with a metal layer inside the exterior member, where the metal layers are joined to each other at the sealing portion, preventing the heat-absorbing agent from permeating through the resin layer, thus maintaining the agent's quantity and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin layers are used to enclose the heat-absorbing agent, then the exterior member provides protection and containment, but moisture of the heat-absorbing agent leaks through fine voids in the resin layer at the joined portion
Solution Approach 1:
The patent uses a composite structure consisting of an inner resin layer and an outer metal layer. The resin layer provides flexibility and sealing, while the metal layer provides impermeability to moisture. This composite material approach resolves the contradiction by combining the advantages of both materials to prevent leakage while maintaining containment.
Solution Approach 2:
The patent applies different material properties to different portions of the exterior member. The inner layer uses resin with good sealing properties, while the outer layer uses metal with impermeability. This local differentiation of material quality allows each layer to perform its specific function optimally, preventing moisture penetration through the joined portions.
2Reliability
If resin layers are joined together at the sealing portion, then the exterior member can be sealed, but the fine voids in the resin layer allow permeation of the heat-absorbing agent
Solution Approach 1:
The patent employs a composite structure with an inner resin layer and an outer metal layer. The resin layer provides sealing functionality while the metal layer provides impermeability. This composite approach maintains sealing performance while preventing the permeation of heat-absorbing agent through the fine voids that would occur with resin alone.
Solution Approach 2:
The metal layer acts as an intermediary barrier between the heat-absorbing agent and the external environment. It mediates the contradiction by providing a impermeable layer that prevents the heat-absorbing agent from escaping through the resin layer's fine voids, while still allowing the resin layer to perform its sealing function.
3Reliability
If the metal layer is placed inside the exterior member, then corrosion and short-circuiting risks are reduced, but the structure complexity increases
Solution Approach 1:
The patent creates a composite exterior member with an inner resin layer and an outer metal layer. This structure places the metal layer inside the overall exterior member assembly, protecting it from direct exposure to corrosive environments and preventing electrical short-circuits. While the structure is more complex than a single-layer design, the composite structure provides superior reliability.
Solution Approach 2:
The patent uses a nested structure where the metal layer is positioned within the exterior member assembly, surrounded by the resin layer. This nesting arrangement protects the metal layer from corrosion and electrical contact while maintaining a compact overall structure. The nested design reduces exposure to harmful environmental factors.
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 suppresses the permeation of the heat-absorbing agent, maintaining its quantity and enhancing the safety of the battery pack by ensuring the metal layer is inside the exterior member, reducing the risk of corrosion and short-circuiting.
Implementation Method 1
the metal layers are joined to each other at the sealing portion... the heat-absorbing member included in the battery pack can suppress permeation of the heat-absorbing agent
Data Source
AI summary
To provide a battery pack including a heat-absorbing member capable of suppressing permeation of a heat-absorbing agent. A battery pack includes a secondary battery and a heat-absorbing member that includes a heat-absorbing agent and an exterior member accommodating the heat-absorbing agent and is in contact with the secondary battery at least in part, wherein the exterior member includes a metal layer, a resin layer overlapping the metal layer, and a sealing portion sealing the heat-absorbing agent, the metal layer is located inside the exterior member, and the metal layers are joined to each other at the sealing portion.