Self-Healing Coating for EV Battery Modules
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Solution Overview
Problem
High-energy density electrochemical cells, such as lithium ion batteries, suffer from damage like liquid leakage and short-circuiting due to surface damage and low abuse tolerance, necessitating improved coatings with higher resilience.
Innovation Solution
A self-healing coating is developed for battery pack components, comprising a cyclic ether capable of reacting in a cationic ring-opening polymerization reaction with an alkali metal salt initiator, which can repair defects and prevent fluid leaks by forming a polymer matrix, applied to various surfaces including cells and cooling system components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coatings are used on battery pack components, then the manufacturing process is simple, but the coating lacks resilience and cannot repair surface damage, leading to low abuse tolerance
Solution Approach 1:
The self-healing coating incorporates dormant cyclic ether monomers and initiators in advance during manufacturing. When surface damage occurs, these pre-positioned components activate to repair the defect, eliminating the need for external intervention while enhancing abuse tolerance
Solution Approach 2:
The coating utilizes changes in physical and chemical parameters, specifically temperature-dependent activation of the cationic ring-opening polymerization reaction. The dormant monomers and initiators remain inactive during normal operation but activate when exposed to heat from damage, enabling autonomous self-healing
2Reliability
If the self-healing coating includes multiple reactive components (cyclic ether monomer and initiator), then the self-healing capability is enhanced, but the manufacturing precision and coating formulation become more complex
Solution Approach 1:
Both the cyclic ether monomer and initiator are incorporated into the coating formulation during manufacturing, positioned in a dormant state. This preliminary placement ensures that when damage occurs, the components are already in place to react and heal the defect, maintaining manufacturing precision while enabling self-healing
Solution Approach 2:
The coating formulation uses local quality by placing the reactive cyclic ether monomer and initiator specifically at or near the surface where defects are most likely to occur. This localized positioning ensures rapid response to surface damage while keeping the bulk coating stable and easy to manufacture
3Reliability
If the coating is designed to self-heal defects, then the battery pack component reliability improves, but the coating structure becomes more complex requiring cyclic ether monomers and initiators
Solution Approach 1:
The coating structure incorporates self-service capability by including both the cyclic ether monomer and initiator within the coating matrix. When fluid leakage or surface damage occurs, the coating autonomously activates the polymerization reaction to seal the defect, eliminating the need for external repair systems while preventing fluid leaks
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 self-healing coating effectively seals defects and prevents fluid leaks, enhancing the abuse tolerance and reliability of battery pack components by continuously repairing mechanical integrity and initial properties.
Implementation Method 1
a first precursor including a cyclic ether capable of reacting in a self-healing cationic ring-opening polymerization reaction
Data Source
AI summary
The present disclosure provides a battery pack component including a self-healing coating. The self-healing coating is disposed on at least a portion of a surface of the battery pack component. The self-healing coating includes a first precursor including a cyclic ether capable of reacting in a self-healing cationic ring-opening polymerization reaction. The self-healing coating further includes an initiator including an alkali metal salt. The self-healing cationic ring-opening polymerization reaction occurs when a defect is present in the self-healing coating. In certain aspects, the cyclic ether may include 1,3-dioxolane (C3H6O2) and the initiator may include lithium bis(fluorosulfonyl)imide (F2NaNO4S2). In other aspects, the self-healing coating may include a second precursor that is capable of copolymerizing with the first precursor. In still other aspects, the present disclosure provides a method of making a self-healing coating for a battery pack component.