Battery Cell Housing Layout for Higher Volumetric Energy Density
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Solution Overview
Problem
Existing battery technologies face challenges in increasing the volumetric energy density of battery cells, particularly in larger volumes, due to limited internal space and structural constraints that affect safety and efficiency.
Innovation Solution
Designing a battery cell with a housing ratio of internal volume to total volume at 90% or higher, optimizing wall thicknesses and incorporating insulating members to maximize internal space for the electrode assembly, while maintaining structural integrity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wall thickness of the housing is increased to improve structural strength, then strength is improved, but internal volume is reduced
Solution Approach 1:
The patent applies local quality by differentiating wall thickness across different locations of the housing. The first wall has a first thickness, the second wall has a second thickness, and the third wall has a third thickness, where these thicknesses are not necessarily equal. This allows the housing to have sufficient structural strength at critical locations while minimizing wall thickness elsewhere to maximize internal volume for the electrode assembly.
2Quantity of substance
If internal volume is increased to improve volumetric energy density, then volumetric energy density is improved, but structural strength is reduced
Solution Approach 1:
The patent resolves this contradiction by implementing non-uniform wall thickness distribution. By making walls thinner in less critical areas and maintaining adequate thickness where structural support is needed, the design maximizes internal volume (improving volumetric energy density) while preserving necessary structural strength through localized reinforcement.
3Quantity of substance
If housing volume is optimized for maximum electrode assembly space, then volumetric energy density is improved, but safety is compromised
Solution Approach 1:
The patent addresses safety concerns by strategically varying wall thickness rather than uniformly reducing it. Critical walls that provide safety functions (such as containing pressure or providing mechanical protection) maintain adequate thickness, while non-critical walls are minimized to maximize electrode assembly space, thus improving volumetric energy density without compromising safety.
Data Source
AI summary
A battery cell, a battery, an electric apparatus, and an energy storage apparatus are provided. The battery cell includes a housing and at least one electrode assembly positioned within the housing. The housing is a right parallelepiped defined by three mutually perpendicular dimensions: W1, T1, and H1. The housing comprises six walls, arranged in opposite pairs along each direction. The combined thicknesses of the two opposite walls in each direction are denoted as a, b, and c, respectively. The ratio of usable internal volume to total external volume, defined as (W1−a)·(T1−b)·(H1−c)/(W1·T1·H1), is not less than 90%. This structural configuration increases the volumetric energy density of the battery cell using the same chemical system.