Cylindrical Battery Cell Structure for Silicon Anode Swelling
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Solution Overview
Problem
The use of silicon in negative electrode active materials for battery cells leads to significant volume swelling during charging, causing deformation or rupture of the housing and reducing the reliability of battery cells, despite its potential to enhance energy density.
Innovation Solution
A battery cell design incorporating a silicon-containing negative electrode and a cylindrical housing structure, where the electrode assembly is also cylindrical, evenly distributes radial swelling forces, reducing compressive effects on the housing and enhancing structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon is used as negative electrode active material, then energy density is improved, but volume swelling occurs causing housing deformation and reduced reliability
Solution Approach 1:
The patent employs a cylindrical housing structure with curved surfaces instead of flat or angular geometries. This spherical/cylindrical configuration enables uniform distribution of swelling forces generated by silicon-based negative electrode material during charging cycles, preventing stress concentration and housing deformation while maintaining structural integrity and reliability
2Quantity of substance
If silicon content in negative electrode is increased, then energy density improves, but swelling forces increase causing compressive effects on housing
Solution Approach 1:
The cylindrical geometry of the housing and electrode assembly transforms the distribution pattern of swelling forces. The curved cylindrical surface area increases and distributes the expansion forces uniformly in all radial directions, reducing the magnitude of compressive effects on the housing walls even when silicon content is substantially increased in the negative electrode
Data Source
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AI summary
This application relates to a battery cell, a battery, and an electric apparatus. The battery cell includes an electrode assembly and a housing. The electrode assembly includes a negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode film layer disposed on at least one side of the negative electrode current collector and containing a negative electrode active material. The housing accommodates the electrode assembly, and the housing includes a side wall, where the side wall surrounds the electrode assembly. The negative electrode active material includes element silicon, and the housing is a cylindrical structure. In the embodiments of this application, battery cells can have excellent use reliability while energy density of battery cells is improved.