Multi-Layer Battery Cell Case for Corrosion and Strength Balance
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Solution Overview
Problem
Existing battery technologies face challenges in ensuring safety and prolonging the service life while maintaining structural stability and energy density.
Innovation Solution
A multi-layer case structure for battery cells using materials like aluminum, copper, or chromium that oxidize to form protective oxides, combined with optimized thickness ratios and strength properties to enhance corrosion resistance and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the outermost case is increased to improve corrosion resistance, then the anti-corrosion effect is improved, but the structural strength and deformation capability are reduced
Solution Approach 1:
The case is divided into multiple layers with different functions: the outermost case provides corrosion resistance through oxidation, while inner cases provide structural strength. This segmentation allows each layer to be optimized for its specific function without compromising the other.
Solution Approach 2:
The patent uses a composite structure combining different materials with complementary properties. The outermost case uses materials like aluminum, copper, or chromium that form protective oxides, while inner cases use materials optimized for mechanical strength, creating a composite case system that achieves both corrosion resistance and structural integrity.
2Reliability
If the thickness of the outermost case is increased to improve corrosion resistance, then the anti-corrosion effect is improved, but the service life is reduced due to poor deformation capability
Solution Approach 1:
The case is divided into multiple layers with different functions: the outermost case provides corrosion resistance through oxidation, while inner cases provide structural strength. This segmentation allows each layer to be optimized for its specific function without compromising the other.
Solution Approach 2:
The patent uses a composite structure combining different materials with complementary properties. The outermost case uses materials like aluminum, copper, or chromium that form protective oxides, while inner cases use materials optimized for mechanical strength, creating a composite case system that achieves both corrosion resistance and structural integrity.
3Reliability
If the ratio of outermost case thickness to total case thickness is increased to improve corrosion resistance, then the anti-corrosion effect is improved, but the structural strength is reduced
Solution Approach 1:
Different parts of the case have different thicknesses and material compositions optimized for their specific functions. The outermost case has a specific thickness ratio (0.1-0.5) that provides sufficient corrosion resistance while inner cases have greater thickness to provide structural strength, achieving local optimization of both properties.
4Strength
If the total case thickness is increased to improve structural strength, then the structural stability is improved, but the space utilization and energy density are reduced
Solution Approach 1:
The case is divided into multiple layers with different functions: the outermost case provides corrosion resistance through oxidation, while inner cases provide structural strength. This segmentation allows each layer to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different parts of the case have different thicknesses and material compositions optimized for their specific functions. The outermost case has a specific thickness ratio (0.1-0.5) that provides sufficient corrosion resistance while inner cases have greater thickness to provide structural strength, achieving local optimization of both properties.
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 improves corrosion resistance, structural stability, and extends the service life of battery cells by balancing thickness ratios and material selection, while enhancing energy density and safety against thermal runaway.
Implementation Method 1
the aluminum may be oxidized into a dense aluminum oxide, which can protect against corrosion. When the material of the outermost case contains copper, the copper may be oxidized into a copper oxide, i.e., patina, which can protect against corrosion. When the material of the outermost case contains chromium, the chromium is oxidized to a chromium oxide, which can protect against corrosion.
Data Source
AI summary
Embodiments of the present application disclose a case, a battery cell, a battery, and a power consuming device. The case is applicable to the battery cell. The case is of a multi-layer structure. A material of an outermost case of the case includes at least one of the following: aluminum, an aluminum alloy, copper, a copper alloy, and chromium. According to the case, the battery cell, the battery, and the power consuming device in the embodiments of the present application, the service life of the case can be prolonged.