Nonaqueous Battery Negative Electrode Case Nickel Layer
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Solution Overview
Problem
Nonaqueous electrolytic secondary batteries face issues such as rupture and leakage due to heat treatment during welding, limiting the concentration of supporting electrolyte that can be used for improved battery characteristics.
Innovation Solution
Incorporating a nickel layer with higher thermal conductivity than the base layer, opposite the storage space, and a thickness of 2.6 µm or more, to suppress heat transfer and thermal expansion, along with a clad material for the negative electrode case with a nickel layer proportion of 2% or more, to enhance the battery's structural integrity and prevent rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of supporting electrolyte is increased to improve battery characteristics, then discharge capacity is improved, but heat treatment during welding causes rupture and leakage
Solution Approach 1:
A nickel layer with thickness of 2.6 µm or more is introduced as an intermediary between the base layer and the storage space. This nickel layer acts as a thermal buffer that suppresses heat transfer from welding operations to the electrolyte, enabling high supporting electrolyte concentration (improved battery characteristics) without suffering from welding-induced rupture and leakage.
2Temperature
If a nickel layer with thickness of 2.6 µm or more is added to suppress heat transfer, then thermal protection is improved, but device complexity increases
Solution Approach 1:
The nickel layer thickness is specified as a critical parameter (2.6 µm or more) that optimizes the balance between thermal protection and structural simplicity. By setting this specific threshold value, the patent achieves effective heat transfer suppression while avoiding excessive complexity in the negative electrode case structure.
3Strength
If the nickel layer proportion in clad material is increased to 2% or more to prevent rupture, then structural integrity is improved, but manufacturing cost increases
Solution Approach 1:
The nickel layer proportion in the clad material is set to a specific threshold (2% or more) that provides sufficient structural integrity to prevent rupture during welding and operation. This parameter optimization ensures that the clad material has adequate strength without requiring excessive nickel content that would significantly increase manufacturing cost.
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
This configuration allows for increased supporting electrolyte concentration, reducing heat-related problems and improving battery characteristics while preventing ruptures, resulting in a nonaqueous electrolytic secondary battery with enhanced performance.
Implementation Method 1
the nickel layer having a higher thermal conductivity than the base layer and a thickness of 2.6 μm or more is disposed opposite the storage space with respect to the base layer, and thus suppresses transfer of heat to the storage space via the base layer
Data Source
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AI summary
A nonaqueous electrolytic secondary battery of excellent characteristics is provided. The nonaqueous electrolytic secondary battery includes: a positive electrode case; a negative electrode case fixed to the positive electrode case, and that forms a storage space with the positive electrode case in between the negative electrode case and the positive electrode case; a positive electrode portion provided on the positive electrode case in the storage space, and that contains a lithium compound as positive electrode active material; a negative electrode portion provided on the negative electrode case in the storage space, and that contains SiOx (0 ≤ x < 2) as negative electrode active material; and a nonaqueous electrolyte stored inside the storage space. The negative electrode case includes a base layer, and a nickel layer disposed opposite the storage space with respect to the base layer, and that has a higher thermal conductivity than the base layer, and a thickness of 2.6 µm or more.