Cylindrical Battery Electrode Assembly for Uniform Swelling Stress

The patent applies parameter changes by precisely controlling the radial dimension of the electrode assembly (R1) to be within 0.05mm to 0.15mm of the inner radius of the casing (R2), and by controlling the state of charge (SOC) to be less than 5% during assembly. These parameter adjustments ensure uniform stress distribution in the safety slit, preventing electrolyte squeezing and lithium deposition while maintaining high battery capacity from increased terminal sheet turns.

The patent controls the radial swelling parameter by limiting the difference between the electrode assembly outer radius (R1) and casing inner radius (R2) to 0.05mm-0.15mm, and by controlling SOC to be less than 5% during assembly. This parameter control ensures that the safety slit maintains uniform stress distribution during charging, preventing lithium deposition while allowing necessary radial expansion for high capacity.

The patent optimizes the fit parameter by controlling the radial clearance (R2-R1) to be 0.05mm-0.15mm, which provides sufficient structural stability while allowing adequate space for radial swelling during charging. This parameter optimization ensures uniform stress distribution in the safety slit, preventing lithium deposition while maintaining structural integrity.

The patent controls the radial dimension parameter (R2-R1 = 0.05mm-0.15mm) and SOC parameter (less than 5% during assembly) to ensure that the safety slit maintains uniform stress distribution. This prevents the radial swelling from squeezing out electrolyte between terminal sheets, allowing increased terminal sheet turns for higher energy storage without electrolyte loss.