Cylindrical Battery Housing Parameters for Impact Resistance
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Solution Overview
Problem
Cylindrical secondary batteries face issues with axial movement during vibration and impact tests, leading to failure due to insufficient housing strength, which reduces their impact test pass rate and energy density.
Innovation Solution
Control the thickness and yield strength of the housing within specific ranges (0.3 < 3a + 0.001b < 1.8, 0.05 ≤ a ≤ 0.5, 150 ≤ b ≤ 350 MPa) and adjust the gap and diameter of the electrode assembly to enhance mechanical protection, using materials like 45# carbon steel and copper foil for the housing and negative electrode current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the housing thickness is increased to improve impact resistance, then the impact test pass rate improves, but the energy density deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between housing thickness (a) and yield strength (b), where 0.3 ≤ 3a + 0.001b ≤ 1.8 and 150 ≤ b ≤ 350 MPa. This quantitative approach optimizes the housing parameters to achieve both adequate impact resistance and acceptable energy density, resolving the contradiction between protection and space utilization.
2Reliability
If swelling tape is added to increase friction, then the impact test pass rate improves, but the energy density deteriorates
Solution Approach 1:
The patent extracts and removes the swelling tape from the battery structure, replacing it with a housing design that achieves impact protection through optimized dimensional and material parameters rather than additional friction-increasing components. This eliminates the need for extra space-consuming elements while maintaining reliability.
3Strength
If the housing yield strength is increased to prevent housing failure, then the impact test pass rate improves, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent establishes an optimal range for housing yield strength (150 ≤ b ≤ 350 MPa) and its relationship with thickness (0.3 ≤ 3a + 0.001b ≤ 1.8), providing clear manufacturing guidelines that balance strength requirements with production feasibility, avoiding excessive complexity while ensuring adequate protection.
Data Source
Figure 1
AI summary
The present application provides a cylindrical secondary battery and an electronic device, where the cylindrical secondary battery includes an electrode assembly and a housing accommodating the electrode assembly, the electrode assembly including a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. A thickness of the housing is a mm, a yield strength of the housing is b MPa, and a and b satisfy: 0.3 < 3a + 0.001b < 1.8, and 0.05 ≤ a ≤ 0.5.