Cylindrical Battery Cell Housing for High Volumetric Energy Density
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Solution Overview
Problem
The challenge of increasing the volumetric energy density of battery cells has not been adequately addressed in existing battery technology.
Innovation Solution
A cylindrical battery cell design is implemented with a housing ratio of internal volume to total volume of 96% or more, optimized dimensions for the end walls and side wall, and the inclusion of insulating members to maximize internal space for the electrode assembly and electrolyte, using materials like aluminum or iron alloys for structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wall thickness of the housing is increased to improve structural strength, then the housing can better resist impact and internal pressure, but the internal volume of the housing decreases, reducing the volumetric energy density
Solution Approach 1:
The patent applies parameter changes by optimizing the wall thickness to a specific range (0.2-2mm for side wall, 2-7mm for end walls) and controlling the internal volume ratio to be at least 96% of the total housing volume. This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where the housing has sufficient strength while maximizing internal space for energy storage components.
2Quantity of substance
If the volumetric energy density is increased by enlarging the electrode assembly, then more energy is stored in the same volume, but the structural integrity and safety margin of the housing decreases
Solution Approach 1:
The patent controls the internal volume ratio to be at least 96% of total housing volume, which provides sufficient space for the electrode assembly while maintaining adequate structural margins. This parameter control enables high energy density without compromising safety or structural integrity.
Solution Approach 2:
The housing uses aluminum alloy or iron alloy materials that provide high strength-to-weight ratio and excellent mechanical properties. These composite materials enable the housing to maintain structural integrity while accommodating larger electrode assemblies for higher energy density.
3Volume of moving object
If the housing volume is maximized to accommodate more electrolyte and electrode assembly, then the volumetric energy density increases, but the housing becomes more susceptible to deformation under internal pressure
Solution Approach 1:
The patent optimizes the wall thickness parameters (side wall: 0.2-2mm, end walls: 2-7mm) and maintains the internal volume ratio at ≥96%. This parameter optimization ensures the housing has sufficient volume for high energy density while maintaining adequate resistance to internal pressure and deformation through carefully controlled dimensional parameters.
Data Source
AI summary
A battery cell includes a housing and an electrode assembly, where the electrode assembly is accommodated within the housing, the housing is cylindrical, a height of the housing is H1, and a radius of the housing is R1. The housing includes a first end wall, a second end wall, and a side wall, where the first end wall and the second end wall are oppositely disposed along a height direction of the housing, and the side wall connects the first end wall and the second end wall. A sum of thicknesses of the first end wall and the second end wall is a, and a thickness of the side wall is b, satisfying: (R1−b)2*(H1−a)/(R12*H1)≥96%.