Battery Cell Housing Volume for Electrolyte Leakage Prevention
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Solution Overview
Problem
Existing lithium batteries face safety issues due to electrolyte leakage caused by excessive volume changes in the electrode assembly during charge and discharge, which is exacerbated in large-scale energy storage systems.
Innovation Solution
A battery cell design that reserves sufficient space within the housing by ensuring a ratio of remaining volume to nominal capacity is at least 200 times the product of theoretical specific capacity and density of the alkali metal, preventing electrolyte leakage and improving safety while maintaining high volumetric energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing volume is increased to accommodate electrode assembly expansion during charge and discharge, then electrolyte leakage is prevented, but volumetric energy density decreases
Solution Approach 1:
The patent applies parameter changes by establishing a specific quantitative relationship between housing volume and electrode assembly volume through the formula V1/V2≥ΔV/V2. This parameter-based approach determines the minimum housing volume required to accommodate electrode expansion while preventing electrolyte leakage, thereby resolving the contradiction between safety and energy density through precise volumetric control
2Reliability
If the remaining volume in housing is increased to prevent electrolyte leakage, then safety performance is improved, but the battery cell size increases
Solution Approach 1:
The patent uses parameter changes by defining the critical parameter V1/V2≥ΔV/V2, where V1 is remaining volume, V2 is electrode assembly volume, and ΔV is volume change. This parameter relationship optimizes the balance between safety (preventing electrolyte leakage) and compactness (minimizing battery cell volume) through mathematical formulation
Data Source
AI summary
Provided are a battery cell, a battery, and an electric apparatus. The battery cell includes: an electrode assembly; an electrolyte; and a housing, configured to accommodate the electrode assembly and the electrolyte. The battery cell satisfiesVCAP≥200(C0×ρ0),where V represents a remaining volume inside the housing of the battery cell in a fully discharged state, measured in mL; CAP represents a nominal capacity of the battery cell, measured in Ah; C0 represents a theoretical specific capacity of a corresponding alkali metal in the battery cell, measured in mAh/g; and ρ0 represents a theoretical density of the corresponding alkali metal in the battery cell, measured in g/cm3. The technical solution of this application prevents electrolyte leakage caused by the electrolyte being squeezed out due to excessive changes in the electrode assembly, thereby improving the safety performance of the battery.