Battery Cell Venting Balance for Fast Charging and Gas Control
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Solution Overview
Problem
Existing battery technologies face challenges in increasing charging speed while maintaining battery life and ensuring safety performance.
Innovation Solution
A battery cell design that includes an electrode assembly, a casing with an integrated exhaust mechanism, and an electrolyte, where the specific effective ventilating area of the breathable component, the conductivity of the electrolyte, and the specific gas containment space are optimized to satisfy 20 mm2*mS/cm*ml<AS/V<165 mm2*mS/cm*ml, allowing for rapid ion migration and timely gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging speed is increased, then the charging capability is improved, but the battery life and safety performance deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the relationship between specific effective ventilating area (A), electrolyte conductivity (S), and specific gas containment space (V). By establishing the quantitative relationship AS/V≥20 mm2*mS/cm*ml2*mS/cm*ml, the patent adjusts these parameters to enable fast charging while maintaining battery life and safety. This parameter optimization allows rapid ion migration during fast charging while ensuring timely gas discharge to prevent safety issues.
Solution Approach 2:
The patent implements feedback mechanisms through the exhaust mechanism that monitors and responds to gas pressure conditions. The breathable component automatically discharges gas when internal pressure reaches a threshold, creating a feedback loop that maintains safety during fast charging. This feedback system ensures that increased charging speed does not compromise safety performance.
2Productivity
If the electrolyte conductivity is increased to enable rapid ion migration, then the charging capability is improved, but the gas generation increases requiring larger gas containment space
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing the optimized relationship AS/V≥20 mm2*mS/cm*ml2*mS/cm*ml. This allows the system to achieve high charging capability through increased electrolyte conductivity while simultaneously managing gas generation through appropriate ventilating area and gas containment space. The quantitative relationship ensures that gas management parameters scale appropriately with conductivity improvements.
Solution Approach 2:
The patent applies local quality by differentiating the functions of different components: the electrolyte provides high conductivity for rapid ion migration in specific regions, while the exhaust mechanism with breathable component provides localized gas discharge capability. This spatial differentiation allows high conductivity without requiring proportionally large gas containment space throughout the entire battery.
3Reliability
If the ventilating area of the breathable component is increased to discharge gas timely, then the safety performance is improved, but the charging capability may be affected
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing the optimized relationship AS/V≥20 mm2*mS/cm*ml2*mS/cm*ml. This quantitative relationship determines the appropriate ventilating area (A) that ensures timely gas discharge for safety while maintaining charging capability. The relationship balances gas management requirements with charging performance requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optimized design enhances charging capability while extending battery life and improving safety performance by balancing gas discharge and ion migration.
Implementation Method 1
the breathable component is configured to discharge gas to outside of the casing when gas pressure inside the casing reaches a threshold
Implementation Method 2
the conductivity of the electrolyte is increased, enabling rapid ion migration and enhancing the overall charging capability of the cell
Data Source
AI summary
A battery cell, a battery, an electric apparatus, and a manufacturing method and manufacturing device of battery cell are described. The battery cell includes: an electrode assembly; a casing having an accommodating cavity for accommodating the electrode assembly; an exhaust mechanism provided on the casing, the exhaust mechanism including a connecting component and a breathable component, and the breathable component is configured to discharge gas to outside of the casing when gas pressure inside the casing reaches a threshold; and an electrolyte, filled in the casing; where gas permeability A of the breathable component, conductivity S of the electrolyte, and gas containment space V satisfy 20 mm2*ms/cm*ml<AS/V<165 mm2*ms/cm*ml, and the gas containment space V is a ratio of a remaining value of volume of the accommodating cavity minus volume of the electrolyte and volume of the electrode assembly to capacity of the electrode assembly.