Intumescent Coating for Electric Vehicle Battery Thermal Isolation
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Solution Overview
Problem
Existing motor vehicles with electrical energy accumulators face challenges in preventing fire spread and thermal insulation during faults, as conventional fire-retardant materials may not suffice due to increasing energy density and thermal energy release, and cannot be used in exterior areas.
Innovation Solution
The vehicle body and battery housing are coated with an intumescent fire protection coating that foams up at elevated temperatures, significantly increasing its thickness and reducing thermal conductivity, providing enhanced thermal isolation and protection from fire hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fire-retardant materials are used to protect the battery housing, then fire resistance is improved, but thermal insulation effectiveness deteriorates due to increasing energy density and thermal energy release
Solution Approach 1:
The patent applies an intumescent fire protection coating that undergoes parameter change when exposed to heat - specifically, it transforms from a thin initial state to a thick expanded foam structure. This parameter change (thickness increase) provides enhanced thermal insulation exactly when needed during thermal events, addressing the insufficient insulation provided by conventional materials under high energy density conditions.
Solution Approach 2:
The intumescent coating utilizes phase transition from a dense solid state to an expanded foam structure when exposed to heat. This phase transition creates a thick, insulating carbonaceous layer that effectively blocks thermal energy, resolving the contradiction between fire resistance and thermal insulation effectiveness under high energy release conditions.
2Reliability
If fire-retardant materials are applied to the battery housing, then fire spread prevention is improved, but adaptability to exterior areas deteriorates due to material usage restrictions
Solution Approach 1:
The intumescent coating is specifically designed to remain stable and protective under exterior environmental conditions (moisture, temperature variations) while maintaining its fire protection function. The coating's parameters (chemical stability, adhesion) are optimized to withstand exterior exposure, enabling fire protection in previously unsuitable exterior locations.
3Object-affected harmful factors
If the fire protection coating is applied with sufficient thickness to ensure thermal insulation, then thermal isolation is improved, but device complexity increases
Solution Approach 1:
The intumescent coating is pre-applied to the battery housing at a relatively thin, manageable thickness during manufacturing. The thick protective layer is formed automatically when needed through the intumescent reaction to heat, eliminating the complexity of manually applying and controlling very thick coatings while ensuring adequate thermal insulation.
Solution Approach 2:
The phase transition of the intumescent coating from thin to thick upon heating provides the thermal insulation function dynamically, eliminating the need for complex multi-layer coating systems or thick pre-applied coatings. The coating self-adjusts its thickness based on thermal conditions, simplifying the overall device structure.
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 intumescent fire protection coating effectively isolates the traction battery from the vehicle's interior during a fire, preventing thermal influence on the passenger compartment and ensuring reliable thermal insulation, while also serving as an acoustic insulation layer for added space efficiency.
Implementation Method 1
The intumescent fire protection coating is to be understood as a coating that foams up in the event of a fire or under the influence of heat and thus significantly increases its layer thickness
Implementation Method 2
the thermal conductivity of the fire protection coating is significantly reduced. The fire protection coating thus has a first thermal conductivity at the first layer thickness and a second thermal conductivity at the second layer thickness, wherein the second thermal conductivity is less than the first thermal conductivity
Data Source
AI summary
A motor vehicle having a vehicle body an electrical traction machine, and at least one electrical energy accumulator designed as a traction battery for temporarily storing electrical energy for operating the traction machine. The vehicle body and/or a battery housing of the traction battery is/are provided at least in some regions within intumescent fire protection coating.