Hot Charging System for Electric Vehicle Battery Modules
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Solution Overview
Problem
Typical fast charging systems for battery modules result in lithium plating on anodes, leading to reduced capacity and accelerated aging due to high charging rates, which limits the capability for rapid charging.
Innovation Solution
A hot charging system that heats the battery module with a fluid between 40° C. and 100° C., specifically 60° C., to increase lithium graphite intercalation and electrolyte conductivity, while a battery management system monitors and cools the module to prevent solid electrolyte interphase growth, thereby reducing lithium plating and enhancing battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high charging rates are used to reduce charging time, then productivity is improved, but lithium plating occurs on anodes leading to reduced capacity and accelerated aging
Solution Approach 1:
The patent changes the temperature parameter of the battery module from ambient to elevated (40-100°C) during charging. This parameter change increases lithium diffusion rates and electrolyte conductivity, enabling faster charging without lithium plating. The temperature elevation fundamentally alters the electrochemical kinetics to resolve the contradiction between charging speed and capacity retention.
Solution Approach 2:
The system performs preliminary heating of the battery module before initiating high-rate charging. This preliminary action prepares the battery by increasing temperature to optimal levels, ensuring that subsequent fast charging occurs under conditions that prevent lithium plating. The heating phase precedes and enables the productive charging phase.
2Productivity
If high charging rates are used to reduce charging time, then productivity is improved, but battery aging is accelerated
Solution Approach 1:
Elevating the temperature parameter during charging modifies the electrochemical reaction pathways and kinetics. This parameter change reduces the mechanical stress and side reactions that cause aging, allowing high charging rates to be applied without accelerating degradation. The controlled thermal environment transforms the charging process to be both fast and aging-resistant.
Solution Approach 2:
The system incorporates temperature monitoring and control feedback to maintain the battery module within the optimal 40-100°C range during charging. This feedback mechanism ensures that temperature remains high enough to enable fast charging but controlled enough to prevent thermal runaway and excessive aging. The feedback loop continuously adjusts heating/cooling to preserve battery life while maximizing charging speed.
3Productivity
If battery module is heated to increase lithium diffusion and electrolyte conductivity, then charging speed is improved, but solid electrolyte interphase growth may occur
Solution Approach 1:
The patent optimizes the temperature parameter to a specific range (40-100°C) where lithium diffusion and electrolyte conductivity are significantly enhanced but solid electrolyte interphase growth is minimized. This precise parameter control allows the system to exploit the beneficial effects of heat while avoiding the harmful effects. The temperature window is carefully selected to decouple beneficial kinetics from detrimental side reactions.
Solution Approach 2:
The system maintains continuous temperature control throughout the charging process, ensuring the battery module remains in the optimal temperature range for the entire duration. This continuous action prevents temperature fluctuations that could trigger solid electrolyte interphase formation. The uninterrupted thermal management sustains beneficial lithium diffusion while suppressing harmful interphase growth.
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 hot charging system significantly reduces lithium plating, increases lithium diffusion into graphite six times, and enhances electrolyte conductivity nine times compared to typical fast charging systems, allowing for faster charging without drastic capacity reduction and extending battery life.
Implementation Method 1
heating the battery module to increase lithium diffusion into graphite
Implementation Method 2
enhances electrolyte conductivity nine times compared to typical fast charging systems
Implementation Method 3
cooling the module to prevent solid electrolyte interphase growth
Data Source
AI summary
A hot charging system for an electric vehicle may comprise a battery heating system, a battery cooling system, and a charging system. The hot charging system may be configured to heat a battery module while the battery module is charging and cool the battery module after the battery module is charged. The hot charging system may comprise a plumbing system and a control system. The plumbing system may be configured to place the battery heating system, the battery cooling system, and the battery module in fluid communication. The control system may be configured to charge the battery module via the charging system.