Composite Battery Bottom Plate for Impact and Corrosion Resistance
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Solution Overview
Problem
Existing battery pack bottom protection plates suffer from insufficient impact resistance and corrosion resistance due to the PVC layer chalking and dropping off upon impact, exposing the internal steel plate and compromising protection.
Innovation Solution
A battery protection bottom plate comprising a protective layer, a metal plate, and a fiber-reinforced resin layer, where the metal plate is sandwiched between the protective layer and the fiber-reinforced resin layer, and the thickness and material properties of these layers are optimized to ensure adhesion and resistance to external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PVC layer is sprayed on the bottom surface of the protection plate to resist impact and corrosion, then corrosion resistance is improved, but under external impact the PVC layer chalks and drops off, exposing the internal steel plate
Solution Approach 1:
The patent replaces the single-material PVC coating with a composite structure consisting of a fiber-reinforced resin layer (containing glass fibers and resin) combined with a metal plate. This composite material provides both the corrosion resistance of the resin coating and the impact resistance of the glass fiber reinforcement, solving the contradiction between corrosion protection and impact resistance.
Solution Approach 2:
The patent changes the material parameters by specifying a resin layer with fiber content of 30-70% by weight, thickness of 0.5-2.0mm, and tensile strength ≥200MPa. These parameter specifications ensure the coating maintains both adhesion (corrosion resistance) and structural integrity (impact resistance) under external forces.
2Ease of manufacture
If the protection plate uses a simple steel plate structure, then manufacturing simplicity is maintained, but overall impact resistance is insufficient
Solution Approach 1:
The patent creates a composite protection plate by combining a metal plate base with a fiber-reinforced resin layer. This composite structure significantly enhances impact resistance compared to a simple steel plate, while the manufacturing process (spraying or laminating resin onto the metal plate) remains relatively simple and suitable for industrial production.
3Reliability
If the fiber-reinforced resin layer is made thicker to improve adhesion and impact resistance, then protection performance is improved, but device complexity and material usage increase
Solution Approach 1:
The patent optimizes the resin layer thickness to a specific range of 0.5-2.0mm, which provides sufficient adhesion and impact resistance without excessive material usage. This parameter optimization balances protection performance with structural simplicity and cost-effectiveness.
Solution Approach 2:
The patent reinforces the resin layer with glass fibers concentrated in the regions requiring impact resistance, rather than uniformly thickening the entire structure. This local reinforcement approach improves protection performance while maintaining overall structural simplicity and reducing unnecessary material usage.
Data Source
AI summary
A battery protection bottom plate includes a protective layer, a metal plate, and a fiber-reinforced resin layer. The metal plate is located between the protective layer and the fiber-reinforced resin layer, and the metal plate and the fiber-reinforced resin layer satisfies:0.4≤d1d2*e-ε 0*σ2σ0*ε2+0.5≤2.where d1 is a thickness of the fiber-reinforced resin layer in mm, d2 is a thickness of the metal plate in mm, ε2 is an elongation at break of the metal plate, σ2 is a tensile strength of the metal plate in MPa, ε0 is an elongation at break of the fiber-reinforced resin layer, and σ0 is a tensile strength of the fiber-reinforced resin layer in MPa.